JP6345809B2 - Wavelength multiplexed optical receiver module - Google Patents

Description

  The present invention relates to a wavelength multiplexed optical receiver module, and more particularly to a wavelength multiplexed optical receiver module using a thin film filter.

  As the demand for data gradually increases, the speed and capacity of optical communication tend to increase rapidly, and an optical communication system having a transmission capacity of 10 Gbps or more is already commercialized using a single wavelength optical signal. Is being used. However, in recent years, in metro and backbone transmission networks, a transmission capacity of 40 Gbps or 100 Gbps is required for one optical fiber, and optical signals of four different wavelengths having a transmission speed of 10 Gbps or 25 Gbps per optical fiber. Are used, and wavelength division multiplexing (WDM) optical communication for transmitting 40 Gbps or 100 Gbps data is used.

  In such wavelength division multiplexing optical communication, an optical transmission module for wavelength division multiplexing of four wavelengths of laser light and an optical signal transmitted via an optical line are demultiplexed into respective wavelengths, A “wavelength division multiplexing optical receiver module” that detects an electrical signal with a photodetecting element and amplifies the detected electrical signal is configured as the most important component of the optical communication system. Such a wavelength-multiplexed optical receiver module is configured to demultiplex optical signals received at different wavelengths from each other by demultiplexing the optical fiber connector located at the end of the optical line and a receptacle for coupling the optical receiver module, the optical coupling lens, and the received optical signals. A demultiplexing element for separating, a light detecting element for converting light separated into respective wavelengths into an electric signal (photocurrent), and a transfer impedance type amplifying element for amplifying these electric signals; It is made up of.

  Such wavelength-multiplexed optical receiver modules are roughly classified into the following two types according to the type of demultiplexing element. A first type wavelength division multiplexing optical receiver module is multiplexed using an arrayed waveguide grating (AWG) element 14 as a demultiplexing element, as shown in FIG. The light is separated into each wavelength, and an optical signal having the separated wavelength is converted into an electrical signal using the light detection element 16 and the preamplifier 18 and then amplified and output.

  Specifically, a wavelength multiplexed optical receiver module (hereinafter abbreviated as “optical receiver module”) using the arrayed waveguide grating element 14 has an optical fiber connector (not shown) in which the portion of the receptacle 11 in which the ferrule 12 is inserted. When the multiplexed optical signal is input into the optical receiving module, the aspherical lens 13 is used to couple the light to the optical waveguide of the arrayed waveguide grating element 14 and make it incident. In the arrayed waveguide grating element 14, the optical signal is separated into the respective wavelengths and diverges through the different output ports.

  Each wavelength output from the optical waveguide of the arrayed waveguide grating element 14 and diverges is contained in the light receiving region of the photodetecting element 16 responsible for detecting each optical signal by the lens 15, and the photodetecting element 16 is contained. The electrical signals detected in accordance with the wavelengths are amplified and output by a number of preamplifier elements 18 of the transfer impedance type, which are located in the subsequent stage and connected by wire bonding (not shown).

  In the case of the conventional optical receiver module according to the first embodiment, it is most likely that a lot of optical loss occurs in the optical path from when the optical signal input to the receptacle 11 is finally input to the photodetecting element 16. Is a drawback. The optical loss occurs not only when the input light is made incident on the optical waveguide of the arrayed waveguide grating element 14 using the aspheric lens 13 but also greatly generated inside the arrayed waveguide grating element 14.

  Therefore, in order to reduce the optical loss generated inside the arrayed waveguide grating element 14, the bending of the optical waveguide from the common port at the input end of the arrayed waveguide grating element 14 to each wavelength port at the output end is reduced. Must be designed to minimize. However, in this case, there arises a problem that the size of the arrayed waveguide grating element 14 increases and the size of the entire optical receiving module increases. In general, an optical receiving module using such an arrayed waveguide grating element 14 has a large total optical insertion loss of 2 dB or more in most cases.

  On the other hand, as shown in FIG. 2, an optical receiving module according to another embodiment is a demultiplexing element for separating the wavelength of multiplexed light into four wavelengths and passes only each wavelength. There is an optical receiving module using thin film filters 25-1 to 25-4.

  In this case, the demultiplexing element including the thin film filters 25-1 to 25-4 is generally referred to as a “zigzag filter” in the industry, and the zigzag filter has a predetermined value as shown in FIG. Glass block 24 processed to have an angle, thin film filters 25-1 to 25-4 attached to one side of glass block 24 at predetermined intervals, and glass corresponding to thin film filters 25-1 to 25-4 And a reflection film coated with another reflection block 24-1 attached to the other side of the block 24. The optical signal of each wavelength is reflected inside the zigzag filter, and only the light of the corresponding wavelength is a thin film filter. It has the principle of passing through 25-1 to 25-4.

  The operation principle of the conventional optical receiver module 20 using such a zigzag filter will be briefly described. An optical signal input through the ferrule 22 in the receptacle 21 spreads due to a difference in refractive index with air, and thus The optical signal that spreads into the light becomes parallel light L by the aspherical lens 23.

  When this parallel light passes through the zigzag filter, it is separated into optical signals of respective wavelengths and outputted, and the optical signals of the respective wavelengths pass through the array lens 26 and are converted into focused light to be diverged and diverged. Each optical signal is reflected by a reflecting mirror 27 mounted at an inclination of 45 degrees, and is input to a light detecting element 28 mounted horizontally on the metal optical bench 32.

  The light detection element 28 is a plurality of preamplification elements of transfer impedance type in which electrical signals detected in accordance with input optical signals of respective wavelengths are connected to each other by wire bonding (not shown) at the subsequent stage. At 29, each signal is amplified and output.

  The conventional optical receiving module 20 using such a zigzag filter can greatly reduce the insertion loss of the optical signal as compared with the optical receiving module 10 using the arrayed waveguide grating element 14, and the demultiplexing element itself. There is also an advantage that the size of can also be made smaller.

  However, in the optical receiver module 20 using such thin film filters 25-1 to 25-4, the insertion loss of the zigzag filter and the characteristics of the band pass wavelength are as shown in FIG. In a thin film filter whose angle of incidence (AOI; Angle of Incidence) is designed to be 10 degrees, there is a change in incident angle of +/− 0.1 degrees. There is a drawback that an insertion loss of about 2 dB occurs) and that the deviation of the electrical signal measured by the input accuracy of the focus light by the light detection element 28 is severe.

  Therefore, in order to minimize the insertion loss due to the change in the incident angle with respect to the thin film filter and the deviation of the electrical signal measured from the light detection element, the divergent light is zigzag as parallel light so that the change in the incident angle is minimized. The position and angle of the convex lens-shaped aspherical lens 23 to be incident on the filter and the array lens 26 for accurately allowing the parallel light that has passed through the zigzag filter and separated into the respective wavelengths to enter the light receiving region of the light detection element 28 The alignment of was very important.

  However, the alignment of the position and angle of the aspherical lens 23 and the array lens 26 up to now has been made by measuring and aligning (actively aligning) the electrical signals detected from the light detection elements 28 by hand. However, there is a problem that it is very inefficient in terms of manpower, and as a result, the manufacturing cost increases and the productivity is greatly reduced.

  Accordingly, there is a need for an optical receiver module having a new structure that can solve the above-described problems, improve performance and productivity, and minimize the manufacturing cost and size.

  The present invention is to solve the problems derived above, and in implementing a wavelength multiplexing optical receiver module using a thin film filter, the alignment of the aspherical lens and the array lens on the metal optical bench is performed. An object of the present invention is to provide a wavelength-multiplexed optical receiver module that can be easily performed and can reduce the number, size, manufacturing process, and manufacturing cost of the overall module configuration.

  According to one aspect of the present invention, a wavelength division multiplexing optical receiver module for wavelength division multiplexing (WDM) optical communication, which is coupled to an optical fiber connector formed at the end of an optical line A receptacle, a parallel light receptacle portion including a gradient index lens (GRIN LENS) located in the internal space of the receptacle and converting input light into parallel light, a parallelogram-shaped glass block, and one of the glass blocks A zigzag filter portion for separating a light signal for each wavelength, wherein a coating portion formed on a side surface and a thin film filter formed on the other side surface of the glass block on which the coating portion is formed, and the zigzag filter Parallel light that diverges from the part An array lens disposed downstream of the zigzag filter unit, and horizontally disposed in parallel with the parallel light optical signal downstream of the array lens, for converting the signal into a focused light optical signal. An array light detecting element for detecting an electrical signal by an optical signal for each wavelength emitted from the lens, a reflecting mirror for converting the direction of the focus light emitted from the array lens toward the array light detecting element, and an upper part An optical package unit comprising a metal optical stage for placing and aligning the zigzag filter unit, the array lens, the reflecting mirror, and the array light detection element on a surface; and an electric signal detected from the light detection element A transfer impedance type array preamplifier for amplifying and outputting the signal, an array preamplifier submount on which the array preamplifier is mounted, a module Wavelength multiplexing optical receiver module comprising a preamplification element before comprising a housing may be provided.

  According to another aspect of the present invention, a wavelength division multiplexing (WDM) optical receiving module for optical communication of a wavelength division multiplexing (WDM) system, which is coupled to an optical fiber connector formed at the end of an optical line A parallel light receptacle portion including a gradient index lens (GRIN LENS) positioned in the internal space of the receptacle and converting input light into parallel light, a parallelogram shaped glass block, and a glass block A zigzag filter unit for separating an optical signal according to each wavelength, wherein a coating unit formed on one side surface and a thin film filter formed on the other side surface of the glass block on which the coating unit is formed, is formed. Parallel light that diverges from the filter An array lens disposed downstream of the zigzag filter unit to convert the signal into a focused light optical signal; and an array lens disposed perpendicular to the parallel light optical signal downstream of the array lens; An array light detecting element for detecting an electrical signal generated by the focus light emitted from the array lens, an array light detecting element submount on which the array light detecting element is vertically mounted, the zigzag filter portion on the upper surface, the array lens, An optical package unit composed of an array photodetecting element and a metal optical stand for placing and aligning the array photodetecting element submount, and a transmission for amplifying and outputting an electric signal detected from the photodetecting element An impedance type array preamplifier, an array preamplifier submount on which the array preamplifier is mounted, and a module. A preamplifier element portion consisting of a Lumpur housing, the wavelength multiplexing optical receiver module including a may be provided.

  According to another embodiment of the present invention, there is provided a wavelength division multiplexing optical receiver module for optical communication of wavelength division multiplexing (WDM) system, and an optical fiber connector formed at the end of an optical line A parallel light receptacle part including a gradient index lens (GRIN LENS) positioned in the internal space of the receptacle and converting input light into parallel light, a parallelogram shaped glass block, and the glass A coating part formed on one side of the block, and a thin film filter formed on the other side of the glass block on which the coating part is formed, a zigzag filter part for separating optical signals for each wavelength, A flat surface separated from the zigzag filter unit and diverging. A reflecting mirror that vertically refracts the optical signal in the downward direction, and a parallel lower optical signal reflected by the reflecting mirror is arranged below the reflecting mirror in parallel with the reflecting mirror. An array lens for converting into an optical signal, an array light detecting element that is arranged in parallel to the array lens below the array lens, and detects an electrical signal generated by a focused light signal diverged from the array lens; Metal optics that mounts and aligns the zigzag filter portion on the upper surface, and arranges the reflecting mirror, the array lens, and the array light detection element in parallel with each other at a predetermined interval. An optical package unit comprising a base, a transfer impedance type array preamplifier for amplifying and outputting an electrical signal detected from the photodetection element, and the array preamplifier are mounted An array preamplification device submount that the preamplifier element unit comprising a module housing, the wavelength multiplexing optical receiver module including a may be provided.

  Wavelength multiplexed optical receiver modules according to various embodiments of the present invention can minimize the active alignment process associated with the manufacture of optical receiver modules, and many individual assembly-type configurations of optical receiver modules can be manufactured individually. And, by being assembled and formed, overall module productivity (manufacturing yield) can be improved.

  In addition to improved manufacturing yield, optical receiver modules with excellent characteristics can be mass-produced at low cost, and the price of optical transceivers that use optical receiver modules as important components can be reduced. The activation of the receiver module market and the wavelength multiplexing technology can greatly contribute to increasing the data transmission capacity of optical communication.

It is a top view which shows the wavelength division multiplexing optical receiver module using the conventional arrayed-waveguide grating (AWG; Arrayed Waveguide Grating) element. It is the top view and sectional drawing which show the wavelength division multiplexing optical receiver module using the conventional thin film filter. It is a graph which shows the insertion loss curve by the incident angle of the light of the bandpass thin film filter (Band Pass Filter) of the wavelength division multiplexing optical receiver module using the thin film filter in FIG. 1A and 1B are a plan view and a cross-sectional view illustrating a wavelength division multiplexing optical receiver module according to an embodiment of the present invention. It is sectional drawing which shows the state by which the silicon | silicone V groove | channel reflective mirror was applied to the optical package part in FIG. FIG. 3 is an assembly explanatory diagram for explaining an assembly process of the wavelength division multiplexing optical receiver module in FIG. 1. FIG. 6 is a cross-sectional view illustrating a wavelength division multiplexing optical receiver module according to another embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating a state in which a lens integrated photodetecting element is applied to the optical package unit in FIG. 7. FIG. 6 is a plan view and a cross-sectional view showing a parallel light receptacle part and an optical package part of a wavelength division multiplexing optical receiver module according to still another embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are provided as examples to fully convey the concept of the present invention to those skilled in the art. Therefore, the present invention is not limited to the examples described below, and may be embodied in other forms. In the drawings, the width, length, thickness, and the like of components may be exaggerated for convenience. Throughout the specification, the same reference numerals denote the same components.

  FIG. 4 is a plan view and a cross-sectional view showing a wavelength division multiplexing optical receiver module according to an embodiment of the present invention. FIG. 5 is a cross-sectional view showing a state in which a silicon V-groove reflector is applied to the optical package part of FIG.

  First, referring to FIG. 4, a wavelength-multiplexed optical receiver module (hereinafter abbreviated as “optical receiver module”) according to an embodiment of the present invention includes a parallel optical receptacle unit 110, a zigzag filter unit 120, and an optical package. Part 130 and preamplifier element part 140.

  The parallel light receptacle unit 110 is configured to connect an optical connector (not shown) located at the end of the optical line and an optical receiving module, and includes a cylindrical receptacle 111 and a ferrule located inside the receptacle. 112, a cylindrical sleeve 113 located between the receptacle 111 and the ferrule 112, and a gradient index lens (GRIN LENS) 114 located inside the receptacle 111 on the rear stage side of the ferrule 112. At this time, the ferrule 112, the sleeve 113, and the gradient index lens 114 have the same central axis within the receptacle 111.

  The parallel light receptacle 110 is characterized in that a gradient index lens 114 is further inserted as compared with a conventional receptacle consisting only of a ferrule and a sleeve. At this time, the ferrule 112 and the gradient index lens are provided. One surface of 114 facing each other may be processed. The gradient index lens 114 functions to convert the dispersed light diverged through the ferrule 112 into parallel light. In the gradient index lens 114, the position of the focal length for producing perfect parallel light is determined in accordance with the length of the gradient index lens 114, and therefore the gradient index lens 114 of a desired standard. Therefore, the ease of design and production can be increased. Further, the gradient index lens 114 has a structure in which the ferrule 112 having the same cylindrical structure is inserted into the receptacle 111 having a cylindrical structure and a structure that is inserted into the receptacle 111 without a separate alignment process. Only the process of fixing at an accurate position is required only with a high degree of accuracy, so that a relatively perfect collimated light can be produced without a separate active alignment.

  The parallel light receptacle 110 includes an aspherical convex lens configured to produce parallel light in a conventional optical receiving module, and a photocurrent of the light detecting element to position the aspherical convex lens at an accurate focal length. This has the advantage of eliminating the problems of increased complexity of the assembly process and reduced manufacturing yield associated with the use of an active alignment scheme to measure and locate the aspherical convex lens.

  The zigzag filter unit 120 is a demultiplexing element for separating an optical signal for each wavelength, and is formed on a side surface of the parallelogram glass block 123 and one side of the glass block 123 at a predetermined interval. And a thin film filter 124-x: 124-1 to 124-4 that allows the signal to pass therethrough. At this time, coating portions 121 and 122 may be formed on the other side of the glass block 123 on which the thin film filters 124-x: 124-1 to 124-4 are formed.

  The coating parts 121 and 122 are formed with an antireflective film coating part 121 formed in a predetermined area corresponding to an area where an optical signal is incident through the gradient index lens 114 and an antireflective film coating part. It may be formed separately from the reflective film coating portion 122 formed in a region other than the region.

  At this time, the non-reflective film coating part 121 formed on one side of the glass block 123 plays a role of minimizing loss due to the reflection of the optical signal incident through the gradient index lens 114 on the glass block 123. The reflective film coating unit 122 reflects the optical signal reflected from the thin film filter 124-1 formed on the opposite side again and enters the next thin film filter 124-2 to 124-4. Play a role.

  In the zigzag filter unit 120, first, the non-reflective film coating unit 121 is formed in a partial region of one side surface of a glass plate having a predetermined refractive index and thickness, and a reflective film is formed in another region of the same surface. After the coating portion 122 is formed and then cut to have a predetermined size, the cut glass block is polished at a precise angle so that the cross section has a parallelogram shape, and then a thin film filter prepared in advance 124-x: 124-1 to 124-4 can be manufactured by sequentially attaching the glass block 123 to a predetermined position on the other side surface corresponding to the one side surface on which the coating portion of the glass block 123 is formed.

  The zigzag filter unit 120 according to the structure and the manufacturing process of this form reduces the number of parts required and the assembly process compared to the conventional structure having a form in which another reflective film is manufactured and attached to the side surface of the glass block. By simplifying, the manufacturing cost of the zigzag filter portion can be reduced.

  The optical package unit 130 may include an array lens 131, a reflecting mirror 132, an array light detection element 133, and a metal optical stand 134.

  At this time, the array lens 131 is a lens in which divergent light is converted into focus light, and is integrated into one component. The array light detection element 133 is a light detection element integrated in one component. Thus, its role can be similar to the conventional one.

  The reflecting mirror 132 is configured to refract the focused light emitted from the array lens 131 located on the upper side of the array light detecting element 133 to the array light detecting element 133, and a rod coated with a reflective film on one surface. The mirror may be formed to be inclined at a predetermined angle (about 45 degrees).

  The metal optical stage 134 is a component on which the zigzag filter unit 120, the array lens 131, the reflecting mirror 132, and the array light detection element 133 are mounted and fixed, and each component is mounted and aligned and fixed. Further, the alignment groove portion 135 and the placement portion 135a can be processed and formed. Specifically, an alignment groove having a shape corresponding to the glass block 123, the array lens 131, and the array light detection element 133 of the zigzag filter unit 120 may be formed on the upper side of the metal optical stage 134. Further, a mounting portion 135a for projecting the reflecting mirror 132 at a predetermined angle may be formed on the upper side of the array light detection element 133 so as to protrude.

  The metal optical stage 134 on which the alignment groove 135 and the mounting portion 135a for aligning and placing the respective components are processed needs to perform conventional active alignment in the case of each component, particularly the array lens 131. The position of each component can be aligned with only mechanical accuracy, and in the case of the reflector 132, there is no need to provide another component for adjusting the angle and mounting, and the time required for the manufacturing process can be reduced. Production efficiency can be improved by reducing costs. Further, each component is aligned and placed in the alignment groove portion 135 and the placement portion 135a of the metal optical stand 134, thereby preventing damage to the component and deformation of the alignment state due to external force. Durability can also be improved.

  The preamplifier element unit 140 includes an optical receiver module housing 141, an array preamplifier element 142 in which transfer impedance type preamplifier (TIA) elements are integrated in one configuration, and an array preamplifier element 142. And an array preamplifier submount 143 placed thereon.

  FIG. 5 is a cross-sectional view illustrating a state in which a V-groove-etched silicon semiconductor is applied to the optical package portion in FIG.

  On the other hand, as shown in FIG. 5, instead of the plate-like reflecting mirror 136 for refracting the focus light diverged by the array lens 131 in the optical package part downward where the array light detection element 133 is located, A silicon V-groove reflector 136 may be configured. The silicon V-groove reflector 136 is formed by etching a V-groove on a silicon semiconductor and applying a reflective film coating to the etched inclined surface. The silicon V-groove reflector 136 is a normal flat plate. Compared to using the reflecting mirror 136, the optical package unit 130 operates more efficiently in terms of reducing the price, compared with using the reflecting mirror 136. be able to.

  However, when the silicon V-groove reflecting mirror 136 is used to refract light toward the array light detection element 133, the reflection angle is not 45 degrees, but the angle of the inclined surface that appears during wet etching of silicon. It will be about 54.7 degrees. In such a case, the light incident on the array light detecting element 133 is incident at about 80.3 degrees instead of 90 degrees, but this can be adjusted according to the position of the reflecting mirror. The photocurrent value has little influence (or change).

  The parallel light receptacle part 110, the zigzag filter part 120, the optical package part 130, and the preamplifier element part 140 constituting the optical receiver module according to the embodiment of the present invention can be manufactured and assembled in separate assemblies, These assembly steps will be described with reference to FIG.

  FIG. 6 is an assembly explanatory diagram for explaining an assembly process of the wavelength division multiplexing optical receiver module in FIG.

  First, the process of the assembly step-1 which attaches the zigzag filter part 120 to the predetermined position of the optical package part 130 is performed. At this time, the distance between the zigzag filter unit 120 and the array lens 131 does not affect the characteristics of the module when the assembly step-1 is performed. However, the deviation of the zigzag filter unit 120 is caused by the optical loss and wavelength characteristics. It will have a big impact on On the other hand, since the metal optical stand 134 according to the present invention has the alignment groove 315, it can be assembled with the displacement of the zigzag filter part 120 minimized even by simply placing the zigzag filter part 120 in the alignment groove 315. Can be done.

  The process of assembly step-2 is performed in which the optical package unit 130 in which the zigzag filter unit 120 is assembled in the assembly step-1 is attached to a predetermined position inside the preamplifier element 140. Since the accuracy of this assembly process does not affect the optical characteristics of the optical receiving module, accurate positional accuracy is not required. In addition, the array light detection element of the optical package unit 130 assembled inside the preamplifier element unit 140 is connected to the array preamplifier element 142 of the preamplifier element unit 140 by wire bonding (not shown in the drawing). ).

  Finally, the assembly step-3 is performed in which the parallel light receptacle unit 110 is assembled to the assembly in which the zigzag filter unit 120, the optical package unit 130, and the preamplifier element unit 140 completed in the assembly step-2 are assembled. Is called. In this assembly process, light is input through the receptacle of the parallel light receptacle 110 to read the output electric signal (photocurrent) value of the corresponding array light detection element, and parallel to the position where the maximum electric signal value is obtained. The optical receptacle 110 must be assembled in an active alignment method for fixing. In this case, active alignment must be performed so that the electrical signal values of at least two or more array photodetectors are output to a value equal to or greater than a predetermined reference. It may be advantageous to measure and align the electrical signal values of long photodetection elements (eg, 124-1, 124-4).

  Hereinafter, a wavelength division multiplexing optical receiver module according to another embodiment of the present invention will be described.

  FIG. 7 is a sectional view showing a wavelength division multiplexing optical receiver module according to another embodiment of the present invention. FIG. 8 is a cross-sectional view showing a state in which a lens integrated photodetecting element is applied to the optical package portion of FIG.

  Referring to FIG. 7, in the optical receiver module according to another embodiment of the present invention, the array photodetecting element 133, which is one of the components constituting the optical package unit 130, is made of metal compared to the embodiment of the present invention. It is characterized in that it is not attached to the upper surface of the optical bench 234 but is attached vertically to the array light detection element submount 237. According to such a structure, since it is not necessary to refract the direction of light incident on the array light detection element 233, a configuration such as the reflecting mirror 132 or the silicon V-groove reflecting mirror 136 configured in the optical package unit of one embodiment. This eliminates the need for elements and enables the production of a more compact optical receiver module.

  On the other hand, a lens integrated photodetecting element 238 of the array photodetecting element 233 of the optical receiving module according to another embodiment of the present invention shown in FIG. 8 is used. The lens integrated photodetecting element 238 is a module in which a lens is integrated into the back surface of the light receiving area of the photodetecting element. Conventionally, if light is input to the light receiving area via the front surface of the photodetecting element, The lens integrated photodetecting element has a structure in which light input through a lens is input to a light receiving region through the back surface of the photodetecting element.

  In this way, in the optical package unit 230 using the lens integrated photodetecting element 238, an array lens for converting the parallel light L that has passed through the zigzag filter unit 220 into a focused light is not required, so that the manufacturing process is simplified. And the size of the manufacturing module can be reduced.

  Hereinafter, a wavelength division multiplexing optical receiver module according to still another embodiment of the present invention will be described.

  FIG. 9 is a plan view and a cross-sectional view showing a parallel light receptacle part 320 and an optical package part 330 of a wavelength division multiplexing optical receiver module according to still another embodiment of the present invention.

  Referring to FIG. 9, an optical receiver module according to another embodiment of the present invention is different from the optical receiver module according to the above-described embodiment in the optical package unit. Therefore, only the optical package unit 330 will be described. To do.

  In an optical package unit 330 according to still another embodiment of the present invention, an array lens 331 positioned between the zigzag filter unit 320 and the reflecting mirror 333 is disposed between the reflecting mirror 332 and the array light detecting element 333. The position is moved as described above. At this time, the array lens 331 is arranged in parallel with the array light detection element 333 on the same vertical line.

  The distance between the array lens 331 and the array light detection element 333 is such that a step is provided at a predetermined position on both edges of the metal optical table 334 so that the array light detection element 333 is positioned at the focal length of the array lens 331. The array lens 331 is aligned. This can correspond to the mounting portion described in the embodiment.

  The optical receiver module according to the various embodiments of the present invention as described above can minimize the active alignment process associated with the manufacture of the optical receiver module, and the multiple individual assembly-type configurations in the optical receiver module can be individually used. By being manufactured and assembled, overall module productivity (manufacturing yield) can be improved.

  In addition, the module can be miniaturized, and the manufacturing process and manufacturing cost can be reduced by reducing the number of components, and the price of the optical transceiver that uses the optical receiving module as an important part can also be reduced. In particular, the activation of the optical receiver module market and the use of wavelength multiplexing technology can greatly contribute to increasing the data transmission capacity of optical communication.

  The above-described present invention can be variously replaced, modified and changed by those who have ordinary knowledge in the technical field to which the present invention belongs without departing from the technical idea of the present invention. The present invention is not limited to the drawings, and all or a part of the embodiments may be selectively combined so that various modifications can be made.

Claims (11)

A wavelength division multiplexing optical receiver module for optical communication of wavelength division multiplexing (WDM) system,
A receptacle coupled to an optical fiber connector formed at the end of an optical line, a gradient index lens (GRIN LENS) positioned in the internal space of the receptacle and converting input light into parallel light, and the gradient index lens A ferrule located in the interior space of the receptacle on the front side of the receptacle, and a cylindrical sleeve disposed between the ferrule and the receptacle, wherein the ferrule and the gradient index lens are opposed to each other. A surface that is not perpendicular to the axis is processed, and the gradient index lens includes a parallel light receptacle that converts the dispersed light emitted through the ferrule into parallel light, and
A parallelogram shaped glass block, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed. Zigzag filter section for separating
In order to convert a parallel light signal separated and diverged from the zigzag filter unit into a focused light signal, an array lens disposed at a subsequent stage of the zigzag filter unit;
An array light detection element that is disposed horizontally behind the parallel light signal and detects an electrical signal of each wavelength-divided light signal emitted from the array lens, and diverges from the array lens. A reflecting mirror that converts the direction of the focused light beam toward the array light detection element, and the zigzag filter unit, the array lens, the reflection mirror, and the array light detection element are placed and aligned on the upper surface. An optical package unit comprising a metal optical bench,
A transfer impedance type array preamplifier for amplifying and outputting an electrical signal detected from the photodetection element; an array preamplifier submount on which the array preamplifier is mounted; and a module housing; And a pre-amplifying element unit comprising: a wavelength-multiplexed optical receiver module. A wavelength division multiplexing optical receiver module for optical communication of wavelength division multiplexing (WDM) system,
A receptacle coupled to an optical fiber connector formed at the end of an optical line, a gradient index lens (GRIN LENS) positioned in the internal space of the receptacle and converting input light into parallel light, and the gradient index lens A ferrule located in the interior space of the receptacle on the front side of the receptacle, and a cylindrical sleeve disposed between the ferrule and the receptacle, wherein the ferrule and the gradient index lens are opposed to each other. A surface that is not perpendicular to the axis is processed, and the gradient index lens includes a parallel light receptacle that converts the dispersed light emitted through the ferrule into parallel light, and
A parallelogram shaped glass block, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed. Zigzag filter section for separating
In order to convert a parallel light signal separated and diverged from the zigzag filter unit into a focused light signal, an array lens disposed at a subsequent stage of the zigzag filter unit;
An array light detection element that is arranged perpendicularly to the parallel light signal behind the array lens and detects an electrical signal generated by the focus light emitted from the array lens, and the array light detection element is perpendicular to the array lens. An array photodetection element submount to be attached, and a zigzag filter section, the array lens, the array photodetection element, and a metal optical stand for mounting and aligning the array photodetection element submount on the upper surface An optical package part;
A transfer impedance type array preamplifier for amplifying and outputting an electrical signal detected from the photodetection element; an array preamplifier submount on which the array preamplifier is mounted; and a module housing; And a pre-amplifying element unit comprising: a wavelength-multiplexed optical receiver module. A wavelength division multiplexing optical receiver module for optical communication of wavelength division multiplexing (WDM) system,
A receptacle coupled to an optical fiber connector formed at the end of an optical line, a gradient index lens (GRIN LENS) positioned in the internal space of the receptacle and converting input light into parallel light, and the gradient index lens A ferrule located in the interior space of the receptacle on the front side of the receptacle, and a cylindrical sleeve disposed between the ferrule and the receptacle, wherein the ferrule and the gradient index lens are opposed to each other. A surface that is not perpendicular to the axis is processed, and the gradient index lens includes a parallel light receptacle that converts the dispersed light emitted through the ferrule into parallel light, and
A parallelogram shaped glass block, a coating part formed on one side of the glass block, and a thin film filter formed on the other side of the glass block on which the coating part is formed are formed. Zigzag filter section for separating
A reflecting mirror that refracts the parallel optical signal separated and diverged from the zigzag filter unit vertically, and is disposed below the reflecting mirror in parallel with the reflecting mirror and reflected by the reflecting mirror. An array lens that converts the parallel light signal into a focused light signal, and a focused light signal that is disposed below the array lens in parallel with the array lens and diverges from the array lens. The zigzag filter unit is placed on the upper surface and aligned with the array photodetecting element for detecting the electrical signal by the reflector, and the reflecting mirror, the array lens, and the array photodetecting element are parallel to each other at a predetermined interval. An optical package unit composed of a metal optical stand to be placed and aligned;
A transfer impedance type array preamplifier for amplifying and outputting an electrical signal detected from the photodetection element; an array preamplifier submount on which the array preamplifier is mounted; and a module housing; And a pre-amplifying element unit comprising: a wavelength-multiplexed optical receiver module. The parallel light receptacle is
The internal space of the previous SL receptacle, gradient index lenses, ferrule and sleeve are both positioned so as to have the same center axis, the wavelength multiplexing optical receiver module according to any one of claims 1 to 3.   When the coating portion is formed on one side surface of the glass block positioned at the rear stage portion of the gradient index lens, the coating portion is formed in a predetermined region where light is input from the gradient index lens. 4. The method according to claim 1, wherein the film coating portion is formed separately from a film coating portion and a reflection film coating portion formed in a region other than the region where the non-reflection film coating portion is formed. 5. Wavelength multiplexed optical receiver module.   The reflecting mirror is a planar reflecting mirror whose one surface is coated with a reflecting film or a silicon V-groove reflecting mirror in which a V-groove is formed on a silicon semiconductor by etching, and the etched inclined surface is coated with a reflecting film. The wavelength multiplexed optical receiver module according to claim 1, wherein the wavelength multiplexed optical receiver module is formed in any one of the following.   The array photodetecting element is formed in a lens-integrated photodetecting element in which a lens for converting a parallel light-like optical signal into a focused light-like optical signal is formed integrally with the photodetecting element. The wavelength-multiplexed optical receiver module described.   In the metal optical stage, the zigzag filter portion, the array lens, the array light detecting element, the reflecting mirror are respectively inserted into the alignment groove portion so as to be aligned, or a projecting inclined surface or a multi-layer step. The wavelength division multiplexing optical receiver module according to any one of claims 1 to 3, wherein the mounting portion is formed selectively or in combination.   The parallel light receptacle part, the zigzag filter part, the optical package part, and the preamplifier element part are manufactured separately, and are formed by assembling them together. The wavelength-multiplexed optical receiver module described.   The wavelength-multiplexed optical receiver module according to claim 9, wherein the parallel light receptacle part is assembled (formed) so as to be biased to the outside separated from the center of one surface of the module housing of the preamplifier element part.   When the parallel light receptacle part is assembled on one surface of the module housing of the preamplifier element part, the output electric signal value of the array light detection element by the light input through the parallel light receptacle part is read, and the maximum The wavelength-multiplexed optical receiver module according to claim 10, wherein the wavelength-multiplexed optical receiver module is assembled by an active alignment method in which a parallel light receptacle is fixed at a position where an electric signal value is obtained.