OPTICAL RECEIVER

• Main Authors: KUROKAWA MUNETAKA, SAEKI TOMOYA, FUJIMURA YASUSHI
• Format: Patent
• Language: English; Japanese
• Published: 20.07.2017
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide an optical receiver capable of suppressing deviation of a phase.SOLUTION: An optical receiver relating to one embodiment recovers information included in signal light L1 by allowing local light L22, L23 to interfere with phase-modulated signal light L12, L13. The optical receiver includes: two MMI elements 32a, 32b for inducing interference between the signal light L12, L13 and the local light L22, L23; and an optical circuit for optically coupling the two MMI elements 32a, 32b with the signal light L12, L13 and the local light L22, 23, respectively. In the optical circuit, the optical axis of the signal light L11 is translated toward the local light L2, and the signal light L12, L13 and the local light L22, L23 propagate in parallel to each other while maintaining a phase relation and enter the two MMI elements 32a, 32b, respectively.SELECTED DRAWING: Figure 3 【課題】位相のずれを抑制することができる光受信器を提供する。【解決手段】一実施形態に係る光受信器は、位相変調された信号光Ｌ１２，Ｌ１３に局発光Ｌ２２，Ｌ２３を干渉させることにより信号光Ｌ１に含まれる情報を回復する光受信器である。この光受信器は、信号光Ｌ１２，Ｌ１３と局発光Ｌ２２，Ｌ２３とを干渉させる２つのＭＭＩ素子３２ａ，３２ｂと、２つのＭＭＩ素子３２ａ，３２ｂのそれぞれに信号光Ｌ１２，Ｌ１３と局発光Ｌ２２，Ｌ２３を光結合させる光回路と、を備え、この光回路において、信号光Ｌ１１の光軸が局発光Ｌ２側に平行移動され、信号光Ｌ１２，Ｌ１３及び局発光Ｌ２２，Ｌ２３は、並進して位相関係を維持しながら２つのＭＭＩ素子３２ａ，３２ｂのそれぞれに入射する。【選択図】図３