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Optical module

A technology of optical modules and optical signals, applied in the field of optical modules, can solve problems such as LD operation and unstable characteristics

Inactive Publication Date: 2015-02-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, in LDs, TE (= Transverse Electric, transverse electric field) polarized light (polarized light having an electric field vector parallel to the active layer) is stably emitted with strong polarization characteristics in one direction. When there is return light to the LD in the polarization direction, the operation and characteristics of the LD may become unstable

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] figure 1 It is a vertical sectional view of Embodiment 1 of the optical module of the present invention. figure 2 It is a partially disassembled perspective view of Embodiment 1 of the optical module of the present invention. exist figure 1 as well as figure 2 Among them, the optical module 101 of the present embodiment is configured to include a case 1 forming a substantially box body, and a first light output unit 11 and a second light output unit 11 respectively fixed to four mounting holes 1a, 1b, 1c, and 1d formed in the case 1. Two light output parts 12 , light input parts 13 , and input and output ports 14 .

[0024] The first light output unit 11 , the second light output unit 12 , and the light input unit 13 are packaged by bottomed cylindrical bodies 41 , 42 , and 43 , respectively. In addition, the first light output unit 11 is equipped with a first laser diode (hereinafter, first LD) 21 for transmission as an optical element housed in the cylindrical b...

Embodiment approach 2

[0048] Figure 7 It is a vertical cross-sectional view of Embodiment 2 of the optical module of the present invention. In the optical module 102 of the present embodiment, the function of the isolator 80 of the first embodiment is decomposed, and the incident-side polarizer 81 separated from the Faraday rotator 87 is divided into the first light output unit 11 and the second light output unit. 12, two polarizers, the first incident-side polarizer 81A and the second incident-side polarizer 81B, are respectively provided. Here, the Faraday rotator 87 and the exit-side polarizer 83 remaining between the first branch filter 61 and the second branch filter 62 are used as the main isolator, and the divided first incident-side polarizer 81A and the second branch filter 81A are divided. The two incident-side polarizers 81B are set as the first and second secondary isolators.

[0049] The first incident-side polarizer 81A and the second incident-side polarizer 81B are arranged in the...

Embodiment approach 3

[0060] Figure 10 It is a vertical sectional view of Embodiment 3 of the optical module of the present invention. Compared with the optical module 103 in this embodiment Figure 7 In Embodiment 2 shown, the first incidence-side polarizer 81A and the second incidence-side polarizer 81B are omitted. When the Faraday rotator 87 is optimized such that the polarization angle is rotated by 45° at the wavelength of the second LD 22 as in the above-mentioned embodiment, the TE polarization angles of the first LD 21 and the second LD 22 are set to In agreement with the 0° polarization angle, the output side polarizer 83 is set to be a 45° polarizer. The emitted light of the second LD 22 is not lost. The output light of the first LD 21 has a loss of -0.02dB.

[0061] On the other hand, the reflected return light returns as TM polarized light (polarization angle 90°) for the second LD 22 and returns in a state close to TM polarized light (polarization angle 85°) for the first LD 21 ....

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Abstract

An optical module includes a casing, a first light output unit that is fixed to the casing and generates a first light signal, a second light output unit that is fixed to the casing while an angle thereof is set to be different from that of the first light output unit and generates a second light signal having a wavelength different from that of the first light signal, a first branching filter that refracts at least any one of the first light signal and the second light signal so that optical axes of the first light signal and the second light signal are partially overlapped, and one isolator that is located at a portion where optical axes of the first light signal and the second light signal are overlapped and performs isolation on the first light signal and the second light signal.

Description

technical field [0001] The present invention relates to an optical module for performing light transmission and light transmission and reception, and more particularly to an optical module including a plurality of light output units. Background technique [0002] In such an optical module including a plurality of light output units, it is known to arrange isolators in independent optical paths of laser diodes (hereinafter, LD) of each light output unit. For example, in Patent Document 1 "Optical Transmitting and Receiving Module", an example of an optical transmitting and receiving module is disclosed. In this module, an isolator is not arranged in the receiving optical path, but an isolator is arranged in the transmitting optical path (LD optical path). the isolator. Although there is no identical optical module that mounts a plurality of LDs of different wavelengths, it is considered as a natural idea to mount isolators in each of the optical paths of the plurality of LDs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28
CPCG02B6/4208G02B6/4246G02B6/4214G02B6/4215G02B6/4204G02B6/42G02B27/28
Inventor 杉立厚志
Owner MITSUBISHI ELECTRIC CORP