JP2900583B2 - Optical circuit device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical circuit device, and more particularly, to an optical circuit device used in an optical fiber cable communication system or an optical information processing system and having a built-in optical passive element.

[Conventional technology]

In optical fiber communication and optical switching systems, wavelength multiplexing is often used to increase the amount of transmission. As one of the optical circuit devices used in the wavelength multiplexing method, there are a wavelength synthesizer and a wavelength demultiplexer. 2 and 3 show configuration examples of a conventional wavelength synthesizer. In FIG. 2, reference numeral 2 denotes a wavelength combining plate, 12 denotes a filter holder, 52 denotes a case,
Shown respectively. The wavelength combining plate 2 is fixed to the filter holder 12 with an adhesive 91, and the filter holder 12 is also fixed in the case 52 with an adhesive 92. When combining two-wavelength light of wavelengths λ1 and λ2, the optical signal 101 of wavelength λ1 is
, And the optical signal 102 having the wavelength λ2 is reflected by the wavelength combining plate 2. The optical signal 103 obtained by combining the two is input to the output optical fiber 82.

In FIG. 3, the light of wavelength λ ₂ is reflected by the mirror on the holder 14 and guided to the wavelength combining plate 2.

[Problems to be solved by the invention]

In general, the spectral characteristics of the wavelength combining plate 2 depend on the incident angle of light. Therefore, in the conventional wavelength synthesizer shown in FIG. 2, it is necessary to rotationally adjust the filter holder 12 to which the wavelength synthesizer plate 2 is fixed in order to obtain a predetermined spectral characteristic. For this reason, usually, the filter holder 12 is supported by a fine adjustment table, and an optimum angle and position adjustment are performed with a slight gap from the base. To make similar adjustments with the optical system of FIG.
Since the two holders 13 and 14 are adjusted alternately, a large adjustment time is required. Also, after applying the adhesive to the gap between the holders 13 and 14 and the pedestal, the holders 13 and 14 and the pedestal are adhered and fixed. is there.

SUMMARY OF THE INVENTION It is an object of the present invention to realize an optical circuit device that easily and quickly adjusts the angle and position of an optical passive element such as a wavelength combining plate and has high thermal environment resistance.

[Means for solving the problem]

The optical circuit device according to the present invention includes a light beam having a first wavelength and a second light beam.
A first optical fiber from which a light beam having a wavelength of
A flat plate optical filter for transmitting the light beam of the first wavelength and reflecting the light beam of the second wavelength, a second optical fiber on which the light beam of the first wavelength is incident, and the second wavelength An optical circuit device comprising: a third optical fiber into which the light beam is incident; and an adjusting structure capable of adjusting an incident angle of the light beam by locking a holder holding the flat optical filter; A case provided with a guide structure formed in an arc shape centered on the light beam reflection point of the flat plate optical filter and having a radial through hole along the arc, and holding one end of the third optical fiber And a fiber holder for adjusting and fixing the position along the arc of the guide structure.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

1 (a) and 1 (b) are a plan view and a perspective view showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a filter holder, 2 denotes a wavelength synthesis plate, 9 denotes an adhesive, 5 denotes a case,
101 is a short-wavelength (λ1) light beam, 102 is a long-wavelength (λ2) light beam, 103 is a wavelength-combined light beam (wavelength λ1 + λ2).
It is. The case 5 has a hole for fitting with the filter holder 1.
111 is provided. After inserting the cylindrical filter holder 1 in which the wavelength synthesizing plate 2 is fixed with the adhesive 9 into the hole 111, the filter holder 1 is rotationally adjusted, and the incident angle of the light beam 103 to the wavelength synthesizing plate 2 is changed. The spectral characteristics of the transmission / reflection band for two wavelengths can be easily adjusted. After this adjustment, the fitting portion between the filter holder 1 and the hole 111 of the case 5 is fixed by laser welding.

Next, the position of the fiber holder 33 is adjusted so that the long-wavelength (λ2) light beam 102 reflected by the wavelength combining plate 2 is input to the optical fiber 83. A fiber end 73 is previously formed at an end of the optical fiber 83, and is fixed to a fiber holder 33 together with a lens 43 for forming a parallel beam. The fiber holder 33 is fitted into the guide groove 6 provided on the side surface of the case 5, adjusted in the direction of the arrow in the figure so that the light beam 102 is optimally coupled to the optical fiber 83, and fixed by laser welding. Here, the groove 6 of the case 5 is formed in an arc shape with a radius R from the wavelength synthesizing plate 2, and the fiber holder 33 is formed at an angle between the light beam 103 and the light beam 102.
It is provided in a range that can be adjusted from 30 degrees to 90 degrees. That is, the angle of incidence of the light beam 103 on the wavelength combining plate 2 is changed from 15 degrees to
It can be adjusted up to 5 degrees, and sufficiently covers the adjustment range of the wavelength characteristic for the wavelength combining plate 2.

In this embodiment, the case of the wavelength demultiplexer has been described as an example. However, it is effective for all optical passive elements such as optical branching / combining, demultiplexing / multiplexing, optical attenuation, and wavelength selection (filter). Of course.

〔The invention's effect〕

As described above, the present invention provides a case in which a hole is provided in a case to be fitted with a cylindrical holder for mounting an optical passive element, and a groove is provided in the case to guide a holder for an optical fiber coupled to the optical passive element. By adjusting the coupling position, the angle adjustment of the optical passive element can be simplified, the adjustment time can be shortened, and the laser welding fixing method can be introduced, improving the reliability such as environmental resistance. There is an effect that can be achieved.

[Brief description of the drawings]

1 (a) and 1 (b) are plan views showing an embodiment of the present invention.
2 and 3 are plan views of a conventional optical circuit device. 1, 12, 14 ... filter holder, 2 ... wavelength synthesis plate, 31, 3
2, 33 ... fiber holder, 41, 42, 43 ... lens, 5, 52
... case, 6 ... groove, 71, 72, 73 ... fiber end, 81, 8
2, 83 ... optical fiber, 9, 91, 92 ... adhesive, 101, 102, 1
03 ... rays, 111 ... holes.

Claims (3)

(57) [Claims] 1. A first optical fiber from which a light beam of a first wavelength and a light beam of a second wavelength are emitted, and a light beam of the second wavelength that transmits the light beam of the first wavelength. A light comprising: a flat plate optical filter for reflecting a beam; a second optical fiber on which the light beam of the first wavelength is incident; and a third optical fiber on which the light beam of the second wavelength is incident. In the circuit device, an adjustment structure capable of adjusting an incident angle of a light beam by locking a holder holding the flat optical filter, and an arc-shaped structure centered on a light beam reflection point of the flat optical filter. A case provided with a guide structure provided with a radial through hole along an arc; and a case for holding one end of the third optical fiber and adjusting and fixing the position along the arc of the guide structure. With a fiber holder Characteristic optical circuit device. 2. The optical circuit device according to claim 1, wherein the adjusting structure of the case is a hole formed in the case so as to be fitted with the cylindrical holder. 3. The optical circuit device according to claim 1, wherein the guide structure of the case is an arc-shaped groove formed on a side surface of the case.