JP3966287B2 - Optical fiber identification device with optical power measurement function - Google Patents

Description

The present invention relates to an optical power measurement function optical center line determination equipment having a light direction determination function and the light power measuring function of optical fiber used for communication cables.

In laying an optical cable or the like, in order to measure the optical loss of a plurality of optical fiber cores housed in the cable, it is necessary to identify and identify the optical fiber core wires. In order to discriminate the optical fiber core, a specific optical signal (for example, an optical signal modulated to a frequency of 270 Hz) is usually sent from one end of the optical cable, and light reception is detected by the light receiving element on the other end side. Then, the determination is made by the detection circuit.
Conventionally, when measuring the optical power of an optical fiber core in the above-mentioned optical core determination, two types of measuring devices, a core detector (ID tester) and an optical power meter, are required. In addition, it is expensive in terms of cost.

As described above, in the invention described in Patent Document 1, the search for the optical fiber and the measurement of the optical power are performed in the invention described in Patent Document 1 without the need for two types of measuring devices, that is, the optical fiber discriminator and the optical power meter. An optical power measurement device that is made possible by a single device is disclosed. This includes a main body part having a photoelectric converter insertion part holding a photoelectric converter at the tip part, a core line search head that is formed so that the photoelectric converter insertion part can be inserted, and sandwiches an optical fiber, and a photoelectric conversion An optical power measuring head that can be connected to the specified optical fiber and that can be connected to the specified optical fiber is mounted. This is realized with one device.
Japanese Patent Laid-Open No. 11-223573

However, in the invention described in Patent Document 1, since only one photoelectric converter is arranged at the center, the light direction of the optical core cannot be determined. Therefore, in order to determine the light direction, it is necessary to separately prepare a device having a light direction discrimination function.
In addition, the method for attaching the core search head or the optical power measurement head to the main body is as follows. The core search head or the optical power measurement head is mounted from the front of the photoelectric converter insertion portion provided on the main body side. Inserting and fixing the mounting part on the side for searching for the core wire or the head for measuring optical power to the head mounting part on the main body side by screwing, it takes time to attach and detach the head, and a tool such as a screwdriver is required. It is necessary separately and the work becomes complicated.

The present invention has been made in view of the above-described circumstances, and by using three light receiving elements, the optical direction discriminating function and the optical power measuring function in the optical fiber are realized by one apparatus, and the mounting of the head The optical fiber identification mode or optical power measurement mode can be automatically switched and set at the point of time, and the optical fiber identification head or optical power measurement head can be easily attached and detached. such without using the light source device of a wavelength to provide an optical power measurement function optical center line determination equipment which is adapted to the presence or absence of an optical signal in the optical transmission line can determine the specific core wire by detecting that, the It was made as a purpose.

An optical fiber discriminating apparatus with an optical power measurement function according to the present invention includes an optical fiber discriminating head formed with a bending portion for partially bending an optical fiber to leak an optical signal, and an end portion of the optical fiber. An optical fiber with an optical power measurement function comprising an optical power measurement head provided with a receptor for detachable mounting, and an optical fiber discriminating head or a main body for detachably mounting the optical power measurement head. In the discriminating apparatus, the main body holds the first light receiving element near the center of the front end where the concave portion to be fitted to the curved portion of the optical fiber identification head is formed, and both sides of the first light receiving element A light receiving element holding means for holding the second light receiving element and the third light receiving element, and a moving means for moving the light receiving element holding means relative to the main body . Move the light receiving element holding means The light receiving element is opposed to the curved portion, and at least two of the light receiving elements are used to detect light leaked from the optical fiber bent along the curved portion to determine the light direction and / or the presence or absence of an optical signal, and to receive light. The element holding means is configured such that a wavelength selection filter can be detachably attached to any one or a plurality of light receiving surfaces of the first light receiving element, the second light receiving element, and the third light receiving element .

Using three light receiving elements, the optical direction discriminating function and the optical power measuring function in the optical core can be realized with one device, and the optical core discriminating mode or the optical power measuring mode is automatically performed when the head is mounted. In addition, since it is possible to easily attach and detach the optical core discriminating head or the optical power measuring head, it is possible to easily perform optical core contrast (search), optical direction discrimination, and optical power measurement. The operation related to the above can be facilitated, and furthermore, the cost can be reduced by providing a plurality of functions in one apparatus.
In addition, since it is possible to detect the presence or absence of an optical signal in the optical transmission line without using a light source device of a special wavelength, it is possible to easily identify the core wire and to use a specific wavelength band in wavelength multiplexing communication. In addition, in the PDS (PON) line, it is possible to reliably determine the presence or absence of the ONU and the comparison of the lines in the splitter part without affecting the communication state of the working line. it can.

  FIG. 1 is a perspective view showing an external appearance of an optical core discriminating apparatus with an optical power measurement function according to an embodiment of the present invention. FIG. 1A is a perspective view showing a state in which an optical core discriminating head (hereinafter referred to as an optical core discriminating apparatus) equipped with an optical power measuring function according to the present invention is mounted. ) Is a perspective view showing a state in which the optical fiber identification head of the optical fiber identification device of the present invention is removed. FIG. 1C is a partial cross-sectional view of the periphery of the mode switching switch when the head is mounted. In the figure, 10 is a main body portion of the optical fiber identification device, 20 is an optical fiber identification head that can be attached to and detached from the main body portion 10, and the optical fiber identification head 20 protrudes toward the main body 10 side. A semicircular curved portion 21 is provided, and the curved portion 21 is provided with a guide groove (not shown) for storing the optical fiber by bending it.

  1 (A) and 1 (B), a main body 10 of the optical fiber identification device includes an upper housing 1, a lower housing 2, an operation lever 3 slidable with respect to the main body 10, a display unit such as an LCD, and the like. 4, a light receiving element holding portion 5 having a semicircular recess that fits into the curved portion 21 of the optical fiber identification head 20 is provided. The light receiving element holding portion 5 holds three light receiving elements, and a light shielding plate 6 is integrally provided. The tip of the main body 10 is always urged toward the head mounting protrusion 7 that fits into the groove 22 provided on the optical fiber identification head 20 side, and to the optical fiber identification head 20 side (front). A mode switching switch 8 is provided that protrudes a certain amount from the head mounting protrusion 7 when the head is not attached. Here, the groove 22 and the head mounting projection 7 have a dovetail structure, for example. The light receiving element holding portion 5 moves relative to the main body portion 10 together with the light shielding plate 6 in conjunction with the operation lever 3 by pushing the operation lever 3 forward (in the direction of the arrow in the figure), and has a concave tip portion. All the light receiving elements held in the position stop at a position facing the curved portion 21 of the optical fiber identification head 20. As a result, the optical core discriminating apparatus enters an operating state and can perform optical core discriminating.

  From the state shown in FIG. 1 (B), when the optical fiber identification head 20 is attached to the main body 10 as shown in FIG. 1 (A), first, in the groove 22 of the optical fiber discrimination head 20, The head mounting projection 7 is fitted from the side surface side of the main body 10, and the optical fiber identification head 20 is attached to the main body 10 by sliding in a parallel (horizontal) direction. At this time, the mode switching switch 8 is pushed into the main body 10 side by the groove 22. As shown in FIG. 1C, the optical fiber identification head 20 is formed with a recess 23 for receiving the tip of the mode switching switch 8, and the tip of the mode switching switch 8 is fitted into the recess 23. Then, the state in which the mode switching switch 8 is pushed into the main body 10 side is released. As a result, the sensor on the main body side (described later) is turned off, and it is recognized that the optical fiber identification head 20 is attached, and the optical fiber identification mode is automatically set.

  Next, the operation lever 3 is slid forward to move the light receiving element holding portion 5 and the light shielding plate 6 relative to the main body portion 10 to obtain an operating state. When the operating state is reached, external light is shielded, and leakage light from the optical fiber that is bent by the bending portion 21 of the optical fiber core discrimination head 20 is detected by at least two light receiving elements. The detected leaked light is amplified and discriminated by a detection circuit provided in the main body unit 10, and the result is displayed on the display unit 4 or the like.

  In the conventional discriminating device, the light receiving element holding unit side is fixed and the head side is moved, and when the optical fiber is set in an operating state, tension is applied to the optical fiber fixed on the head side. There was a possibility of causing damage to the fiber. On the other hand, in the case of the optical fiber identification device of the present invention, since the head side is fixed and the light receiving element holding unit side is moved, there is a concern that tension is applied to the optical fiber side when the operation state is set. And no damage to the optical fiber.

  FIG. 2 is a perspective view showing an external appearance of an optical fiber identification device with an optical power measurement function according to another embodiment of the present invention. FIG. 2A is a perspective view showing a state in which the optical power measuring head of the optical core discriminating apparatus with optical power measuring function (hereinafter referred to as optical core discriminating apparatus) of the present invention is mounted, and FIG. These are perspective views which show the state which removed the optical power measuring head of the optical-core-line discriminating device of this invention. FIG. 2C is a partial cross-sectional view of the periphery of the mode switching switch when the head is mounted. In the figure, reference numeral 30 denotes an optical power measuring head that can be attached to and detached from the main body 10, and the optical power measuring head 30 is provided with a receptor 31 near the center for detachably attaching the end of the optical fiber. ing. In addition, since the structure of the main-body part 10 in this embodiment is the same as that of the main-body part 10 shown in FIG. 1, description here is abbreviate | omitted.

  2A and 2B, the light-receiving element holding unit 5 pushes the operation lever 3 forward (in the direction of the arrow in the figure), thereby interlocking with the operation lever 3 and moving to the main body unit 10 together with the light shielding plate 6. The light receiving element (hereinafter referred to as the first light receiving element) held in the vicinity of the center of the tip portion where the concave portion is formed is relatively moved with respect to the receptor portion 31 of the optical power measuring head 30 (that is, the receptor). At a position facing the end of the optical fiber attached to the section 31). As a result, the optical core discriminating apparatus has an optical structure capable of performing optical power measurement.

  When the optical power measuring head 30 is attached to the main body 10 as shown in FIG. 2A from the state shown in FIG. 2B, first, the head is attached to the groove 33 of the optical power measuring head 30. The projection portion 7 is fitted from the side surface side of the main body 10, and the optical power measuring head 30 is attached to the main body 10 by sliding in a parallel (horizontal) direction. At this time, the mode switching switch 8 is pushed into the main body 10 side by the groove 33, but as shown in FIG. 2C, the optical power measuring head 30 has a recess for receiving the tip of the mode switching switch 8. Therefore, the mode switching switch 8 is maintained in the state where it is pushed into the main body 10 side. At this time, a sensor (described later) on the main body is turned on, and it is recognized that the optical power measurement head 30 is attached, and the optical power measurement mode is automatically set.

  Next, the operation lever 3 is slid forward to move the light receiving element holding portion 5 and the light shielding plate 6 relative to the main body portion 10 to obtain an operating state. At this time, the optical power measurement head 30 is locked to the light shielding plate 6 by the lock / release mechanism 32 provided in the optical power measurement head 30, and forms a light shielding space with the main body 10. When the operating state is reached, the external light is shielded and the optical power of the optical fiber mounted on the receptor 31 of the optical power measuring head 30 is detected by the first light receiving element. The detected optical power is amplified by a detection circuit provided in the main body unit 10, and the result is displayed on the display unit 4 or the like.

  FIG. 3 is a diagram showing a detailed example of the main part of the optical fiber identification device equipped with the optical fiber identification head 20. FIG. 3A is a diagram showing a configuration example of the periphery of the head composed of the optical fiber identification head 20 and the light receiving element holding unit 5, and FIG. 3B is an optical fiber identification head 20 and the light receiving element holding unit. 5 is a diagram showing another example of the configuration around the head composed of 5. FIG. In the figure, 40 is an optical fiber core wire. In the operating state, the optical fiber core wire 40 is fixed in a state of being sandwiched between the light receiving element holding portion 5 of the main body portion 10 and the bending portion 21 of the optical core wire identification head 20.

As shown in FIG. 3 (A), a recess formed at the tip of the light receiving element holding portion 5 has a first light receiving element (hereinafter referred to as PD1) and second light receiving elements on both sides (left and right in the figure). (Hereinafter referred to as PD2) and a third light receiving element (hereinafter referred to as PD3) are disposed, approach the optical fiber core 40 bent by the bending portion 21, and detect and detect leaked light from the optical fiber core 40. . The light level leaked from the optical fiber core 40 is the largest leaked light detected at the first bend, and in the optical direction in the figure, PD2>PD1> PD3. The light direction can be detected by comparing the light levels of the light. For more accurate determination of the light direction, it is preferable that the difference between the light levels of the leaked light in the two light receiving elements is larger. In this embodiment, it is preferable to detect the light levels of PD2 and PD3. However, all the light levels of PD1 to PD3 may be detected.
As another embodiment, in the case of modulated light, the phase difference between the two light receiving elements may be observed by detecting the phase instead of the light level of the leaked light. Furthermore, the direction determination may be performed by detecting both the light level and the phase of the leaked light. Thereby, it is possible to determine the light direction with higher accuracy.

In FIG. 3B, a wavelength selection filter 9 is detachably mounted on the light receiving surface side of the PD 1 disposed near the center of the light receiving element holding portion 5. The other structures are the same as those shown in FIG. 3A, and thus description thereof is omitted here.
In the present embodiment, the leakage light of the optical fiber 40 is received through the wavelength selection filter 9 on the light receiving surface side of the PD 1. As the wavelength selection filter 9, for example, various filters such as a dielectric multilayer film can be used. By disposing the wavelength selection filter 9 on the light receiving surface side of the PD 1 or the like, it becomes possible to detect only an optical signal having a specific wavelength that leaks at the curved portion 21. That is, in wavelength multiplexing communication, it is possible to detect the presence or absence of an optical signal in a specific wavelength band. In addition, the light receiving element in which the wavelength selection filter is arranged may be PD2 or PD3, or may be arranged in any one of PD1, PD2, and PD3.

  Generally, a wavelength band of 1.5 μm or 1.3 μm with a small optical transmission loss is used for a communication optical fiber core for signal transmission. In the case of an optical fiber having a wavelength of 1.5 μm, bending to a small diameter is not preferable and requires careful handling. However, in the case of an optical fiber having a wavelength of 1.3 μm, 1.5 μm Compared to the case of the wavelength, the loss increase is not large, and it can be handled relatively roughly with respect to the small-diameter bending. When laying an optical fiber core or the like, it is necessary to grasp these characteristics and handle the optical fiber core. However, it is assumed that the wavelength band of the optical fiber core to be used is unknown. In such a case, the optical fiber identification device of the present invention can also be applied. For example, by using a wavelength selection filter that passes a wavelength band of 1.5 μm or more, it is possible to easily determine whether the optical fiber core is 1.5 μm or more. That is, since the wavelength band of 1.5 μm or more is allowed to pass and the wavelength band of less than that is cut off, it is understood that what passed is an optical fiber core wire of 1.5 μm or more.

  For example, the wavelength selection filter 9 having a different wavelength range may be provided on the light receiving surface side of the light receiving element of each of PD2 and PD3. Thereby, for example, different wavelengths can be detected by PD2 and PD3. In this case, a switching means for performing detection switching of different wavelengths is provided on the detection circuit side of the main body unit 10 so that optical signals of two different wavelengths can be discriminated and the presence / absence of the optical signal can be checked. it can. Note that three or more light receiving elements (PD) may be provided. A wavelength selective filter having a different selection wavelength is disposed in each light receiving element, and detection switching is performed, so that the wavelength multiplexed optical transmission line can be changed. It is also possible to select an optical signal in a specific wavelength band from among them and check the presence or absence of the optical signal.

  FIG. 4 is a diagram for explaining a PDS (PON) communication line. In an optical transmission line referred to as PDS (Passive Double Star) or PON (Passive Optical Network) communication, a downstream optical signal λ1 from an OLT (telephone optical line terminal) is branched by a splitter, and a plurality of ONUs ( Sent to the user's home Optical Network Unit). Each ONU 1 to ONU 4 selects and acquires only the optical signal addressed to itself. The downstream optical signal λ1 includes a signal for controlling the transmission timing of the upstream optical signal λ2 from each of the ONU1 to ONU4.

  From each of the ONU1 to ONU4, an upstream optical signal λ2 is transmitted at a transmission timing designated by the OLT. Each optical signal λ2 transmitted from each ONU1 to ONU4 enters the OLT with a signal string T at a timing that is combined by a splitter and specified by the OLT. In the OLT, the signal sequence T of the upstream optical signal λ2 is divided into optical signals for the ONU1 to ONU4.

  Here, an optical core discriminating device in which the same wavelength selection filter 9 is provided for PD2 and PD3 is centered at the point X on the exit side of the splitter while maintaining the current communication state on the PDS (PON) communication line shown in FIG. Suppose that it is applied to line discrimination. The wavelength selection filter 9 is a filter that can select the wavelength band of the downstream optical signal λ2. For example, there is an application for abolition of ONU1, and the core wire of ONU1 is determined at point X on the exit side of the splitter in order to remove the line from splitter to ONU1.

  In this case, it is assumed that the ONU 1 is powered off and is not in use, and the OLT and ONU2 to ONU4 are in normal use. Since the wavelength selection filter 9 is selected to transmit only the wavelength of the upstream optical signal λ2, the downstream optical signal λ1 from the OLT is not detected. Further, since the upstream optical signal λ2 is not transmitted from the ONU 1, the upstream optical signal λ2 is not detected at the point X. As a result, no optical signal is detected at the point X, and it can be specified that it is the core of the ONU1 line. In the other ONU2 to ONU4, the upstream optical signal λ2 is detected and determined to be in the live state. For safety, the upstream signal λ2 is detected at point X when the ONU1 side is turned on, and the upstream optical signal λ2 is not detected at point X when the ONU1 side is turned off again. It is good to confirm.

  Further, an optical core discriminating device provided with wavelength selection filters 9 in different wavelength ranges in PD2 and PD3 is left in the current communication state on the PDS (PON) communication line shown in FIG. It is assumed that the method is applied to core line discrimination. For example, one wavelength selection filter 9 (for example, the PD2 side) can detect the upstream optical signal λ2, and the other wavelength selection filter 9 (for example, the PD3 side) can detect the downstream optical signal λ1. It shall be Similarly to the above, there is an application for abolition of ONU1, and in order to remove the line from splitter to ONU1, the core wire of ONU1 is determined at point X at the exit of the splitter.

  In this case, it is assumed that the ONU 1 is turned off and is not in use, and the OLT and the other ONUs 2 to 4 are in normal use. The downstream optical signal λ1 from the OLT is detected by the wavelength selection filter 9 side of the PD 3 at the X point of the ONU1 line, and the communication line is determined to be in the live line state. However, since the upstream optical signal λ2 is not transmitted from the ONU 1, the optical signal λ 2 is not detected on the wavelength selection filter 9 side of the PD 2, and can be specified as the core of the ONU 1 line. For the other ONU2 to ONU4, both the downstream optical signal λ1 and the upstream optical signal λ2 are detected, and it is determined that they are in the live state.

  FIG. 5 is a diagram showing a detailed example of the main part of an optical fiber discriminating apparatus equipped with an optical power measuring head. In FIG. 5, reference numeral 41 denotes an optical fiber core with an optical connector or an optical cord (hereinafter referred to as an optical connector core). Is called a line). In the operating state, the optical connector-attached core wire 41 is detachably attached to the receptor unit 31 of the optical power measuring head 30 and is located near the center of the tip of the light receiving element holding unit 5, that is, at a position facing the receptor unit 31. Optically coupled to the disposed PD1. With this configuration, it can be used as an optical power measuring device.

FIG. 6 is a diagram for explaining an outline of mode switching means for switching modes according to the mounted head.
FIG. 6A is a diagram showing the state of the optical power measurement head 30 and the main body 10 before mounting, and FIG. 6B shows the status of the optical power measurement head 30 and the main body 10 after mounting. It is a figure. The main body unit 10 includes a main body control unit 10a and a sensor control unit 10b. In this example, the mounting surface of the groove 33 of the optical power measuring head 30 is flat in the parallel (horizontal) direction, and the tip of the mode switching switch 8 is moved toward the main body 10 by the groove 33 when mounted. Pushed in. Thereby, the sensor on the main body side is turned on, and the sensor control unit 10b notifies the CPU (not shown) of the main body control unit 10a that the optical power measurement head 30 is mounted, and switches to the optical power measurement mode.

  As shown in FIG. 1B, the optical fiber identification head 20 is formed with a recess 23 for receiving the tip of the mode switching switch 8, and the tip of the mode switching switch 8 is recessed. 23, the state in which the mode switching switch 8 is pushed into the main body 10 side is released, the sensor on the main body side is turned OFF, and the optical control unit 10b is attached to the sensor control unit 10b. Is notified to the CPU (not shown) of the main body control unit 10a, and the mode is switched to the optical fiber identification mode.

  When the optical fiber identification head 20 or the optical power measurement head 30 is attached to the main body 10, the optical fiber detection head 20 or the optical power measurement head 30 side protrudes in the mounting surface parallel (horizontal) direction. And a groove portion may be provided in the mounting surface parallel (horizontal) direction on the main body portion 10 side. In other words, the groove 22 provided in the optical fiber identification head 20 or the optical power measurement head 30 is a protrusion, and the head mounting protrusion 7 provided in the main body 10 is a groove. It is good also as composition which becomes. In this case, for example, a mode switching projection may be provided on the optical power measuring head 30 side, and the mode switching switch 8 may be pressed to turn on the main body side sensor.

  FIG. 7 is a block diagram showing a configuration example of a detection circuit of an optical fiber identification device to which the present invention is applied, in which 11a to 11c are amplification units for amplifying electrical signals from PD1, PD2 and PD3, and 12a. ˜12c is an A / D converter that converts digital signals when the outputs from the amplifiers 11a to 11c are analog signals, 13 is a CPU that controls the whole, and 14 is a gain that controls the gains of the amplifiers 11a to 11c. The control unit 15 is an optical power measurement head sensor that detects the mounting of the optical power measurement head 30, and 16 is a buzzer that rings when, for example, a cardiac control light is input. The optical core discriminating apparatus of the present invention executes functions as a core line contrast (search) device, an optical direction discriminating device, and an optical power measuring device in accordance with the operation of the operation lever 3, and displays the results on the display unit 4. Alternatively, the buzzer 16 notifies the user.

  The optical direction discriminating function and the optical power measuring function realized in the optical core discriminating apparatus configured as described above will be described. The head mounting method is the same as described above, and the description thereof is omitted here. First, when the optical fiber discriminating head 20 is attached to the main body 10, the optical fiber discriminating mode is set, and light leaked from the optical fiber to be discriminated is received by the PD2 and PD3 according to the operation of the operation lever 3. Then, the optical signals received by the PD2 and PD3 are converted into electric signals, and the electric signals are input to the amplifying units 11b and 11c. The amplifying units 11b and 11c amplify the input electrical signal based on the gain controlled by the gain control unit 14, and input the amplified signal to the CPU 13 via the A / D conversion units 12b and 12c. The CPU 13 compares the light levels of the leaked light detected by the PD2 and PD3 based on the input signal, determines the light direction from the comparison result, and displays and outputs the determination result on the display unit 4. In addition, not only this embodiment, you may see all the light levels of PD1, PD2, PD3, and you may see any two light levels.

  When the optical power measurement head 30 is attached to the main body 10, the mode switching switch 8 is pressed, the optical power measurement head sensor 15 is turned on, and the optical power measurement mode is set. In accordance with the operation of the operation lever 3, the light from the optical fiber attached to the receptor unit 31 is received by the PD 1, the optical signal received by the PD 1 is converted into an electrical signal, and the electrical signal is input to the amplifying unit 11a. The amplification unit 11a amplifies the input electric signal based on the gain controlled by the gain control unit 14, and inputs the amplified signal to the CPU 13 via the A / D conversion unit 12a. The CPU 13 calculates the optical power corresponding to the light level detected by the PD 1 based on the input signal, and displays the calculation result on the display unit 4. At this time, an optimum range corresponding to the calculation result is set in the gain control unit 14.

  Needless to say, the optical core discriminating apparatus of the present invention has a function as discriminating of the core wire contrast light (that is, an ID tester) using any one of PD1 to PD3.

  FIG. 8 is a block diagram showing another configuration example of the detection circuit of the optical fiber line discrimination device to which the present invention is applied. In the figure, 17 is a phase difference detection unit. The other circuit configuration is the same as the circuit configuration shown in FIG. 7, and a description thereof will be omitted here. In this example, an embodiment in which the phase difference detection unit 17 is added to the circuit configuration shown in FIG. 7 and the level difference of the leaked light is not seen in the light direction determination, but the phase difference of the leaked light is seen is shown. .

  First, when the optical fiber discriminating head 20 is attached to the main body 10, the optical fiber discriminating mode is set, and light leaked from the optical fiber to be discriminated is received by the PD2 and PD3 according to the operation of the operation lever 3. Then, the optical signals received by the PD2 and PD3 are converted into electric signals, and the electric signals are input to the amplifying units 11b and 11c. The amplifying units 11b and 11c amplify the input electric signal based on the gain controlled by the gain control unit 14, and the phase difference detecting unit 17 uses the phase of the leaked light of each PD from the amplified signals from the amplifying units 11b and 11c. Is detected and input to the CPU 13. The CPU 13 compares the phases of leaked light detected by the PD 2 and PD 3 based on the phase of each input PD, determines the light direction from the comparison result, and displays and outputs the determination result on the display unit 4. Note that the present invention is not limited to this embodiment, and all phases of PD1, PD2, and PD3 may be viewed, or any two phases may be viewed.

FIG. 9 is an external view showing an example of an optical core discriminating device equipped with the optical core discriminating head 20. FIG. 9A is a plan view of an optical core discriminating apparatus equipped with the optical core discriminating head 20, and FIG. 9B is a side view of the optical core discriminating apparatus equipped with the optical core discriminating head 20. It is.
FIG. 10 is a cross-sectional view of an optical core discriminating device equipped with the optical core discriminating head 20. 10A is a cross-sectional view showing an AA cross section of the optical core discriminating apparatus shown in FIG. 9A, and FIG. 10B is a BB cross section of the optical core discriminating apparatus shown in FIG. 9A. FIG.

  In FIG. 10A, as described in FIG. 1, when the optical fiber identification head 20 is attached to the main body 10, first, a head mounting protrusion is formed in the groove 22 of the optical fiber identification head 20. 7 is fitted from the side of the main body 10, and the optical fiber identification head 20 is slid in a parallel (horizontal) direction with respect to the main body 10. At this time, the mode switching switch 8 is pushed into the main body 10 side by the groove portion 22, but as shown in FIG. 10B, the optical fiber identification head 20 receives the tip of the mode switching switch 8. When the recess 23 is formed and the tip of the mode switching switch 8 is fitted into the recess 23, the state in which the mode switching switch 8 is pushed into the main body 10 side is released. At this time, the sensor on the main body side is turned off, and it is recognized that the optical fiber identification head 20 is attached, and the optical fiber identification mode is automatically set.

  In FIG. 10A, the operation lever 3 is slid forward to move the light receiving element holding portion 5 and the light shielding plate 6 relative to the main body portion 10 to be in an operating state. When the operating state is reached, the external light is shielded, and leakage light from the optical fiber that is bent by the curved portion of the optical fiber core discrimination head 20 is detected by the two light receiving elements. The detected leaked light is amplified and discriminated by a detection circuit provided in the main body unit 10, and the result is displayed on the display unit 4 or the like.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention.

It is a perspective view which shows the external appearance of the optical-core-line discriminating apparatus with an optical power measurement function which concerns on one Embodiment of this invention. It is a perspective view which shows the external appearance of the optical-core-line discriminating apparatus with an optical power measurement function which concerns on other embodiment of this invention. It is the figure which showed the principal part detailed example of the optical-core-line discriminating device equipped with the optical-core-line discriminating head. It is a figure for demonstrating a PDS (PON) communication line. It is the figure which showed the principal part detailed example of the optical-core-wire discriminating device equipped with the head for optical power measurement. It is a figure for demonstrating the outline | summary of the mode switching means which switches a mode according to the mounted head. It is a block diagram which shows the structural example of the detection circuit of the optical-core-line discrimination apparatus to which this invention is applied. It is a block diagram which shows the other example of a structure of the detection circuit of the optical fiber identification device to which this invention is applied. It is an external view which shows an example of the optical-core-line discrimination apparatus equipped with the optical-core-line discrimination head. It is sectional drawing of the optical-core-line discrimination apparatus equipped with the optical-core-line discrimination head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Upper housing | casing, 2 ... Lower housing | casing, 3 ... Operation lever, 4 ... Display part, 5 ... Light receiving element holding | maintenance part, 6 ... Light-shielding plate, 7 ... Protrusion part for head attachment, 8 ... Mode change switch, 9 ... wavelength selection filter, 10 ... main body, 10a ... main body control, 10b ... sensor control, 11a-11c ... amplification, 12a-12c ... A / D conversion, 13 ... CPU, 14 ... gain control, 15 DESCRIPTION OF SYMBOLS ... Optical power measurement head sensor, 16 ... Buzzer, 17 ... Phase difference detection part, 20 ... Optical core line discrimination head, 21 ... Bending part, 22, 33 ... Groove part, 23 ... Concave part, 30 ... Optical power measurement head 31 ... Receptor part, 32 ... Lock / release mechanism, 40 ... Optical fiber core wire, 41 ... Core wire with optical connector or cord.

Claims (6)

For optical power measurement, provided with an optical core discriminating head in which a curved portion for leaking an optical signal by partially bending the optical fiber and a receptor for detachably attaching the end of the optical fiber. An optical core discriminating device with an optical power measurement function, comprising: a head; and a main body portion on which the optical core discriminating head or the optical power measurement head is detachably mounted ,
Before SL body portion holds the first light receiving element in mating recesses tip near the center, which is formed in the curved portion of the optical core discrimination head, first on both sides of the first light receiving element A light receiving element holding means for holding the second light receiving element and the third light receiving element, and a moving means for moving the light receiving element holding means relative to the main body .
When the optical fiber identification head is mounted, the light receiving element holding means is moved so that all the light receiving elements are opposed to the curved portion, and at least two of the light receiving elements are bent along the curved portion. Detect the leakage light of the optical fiber to determine the light direction and / or the presence or absence of the optical signal,
The light receiving element holding means is configured such that a wavelength selection filter can be detachably attached to one or a plurality of light receiving surfaces of the first light receiving element, the second light receiving element, and the third light receiving element. An optical fiber identification device with an optical power measurement function. 2. The optical power measurement function according to claim 1, wherein the main body part determines an optical direction of an optical fiber based on a level difference or a phase difference of leakage light detected using the two light receiving elements. Optical fiber identification device. When the optical power measuring head is mounted , the main body moves the light receiving element holding means so that the first light receiving element faces the end of the optical fiber mounted on the receptor, The optical fiber identification device with an optical power measurement function according to claim 1 , wherein the optical power is measured by optically coupling with the optical fiber using a light receiving element . The main body includes a mode switching unit that recognizes the type of the head mounted on the main body and switches to the optical fiber line discrimination mode or the optical power measurement mode according to the recognized head type. The optical fiber identification device with an optical power measurement function according to any one of claims 1 to 3 . When mounting the optical fiber identification head or the optical power measurement head on the main body, a groove provided in a direction parallel to the mounting surface of the optical fiber identification head or the optical power measurement head is provided on the main body. A head that is fitted with a protrusion provided in a direction parallel to the mounting surface from the side surface of the main body, and the optical core discriminating head or the optical power measuring head is slid in the parallel direction with respect to the main body. light power measuring function optical center line determination device according to claim 1, characterized that you have provided a mounting means. When mounting the optical core determination head or the optical power measurement head on the main body, a protrusion provided in a direction parallel to the mounting surface of the optical core determination head or the optical power measurement head is provided on the main body. A head that is fitted into the groove provided in the mounting surface parallel direction from the side surface side of the main body, and the optical core discriminating head or the optical power measuring head is slid in the parallel direction with respect to the main body. light power measuring function optical center line determination device according to claim 1, characterized that you have provided a mounting means.

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