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1. (WO2018159373) OPTICAL MODULE AND OPTICAL MONITORING DEVICE

Pub. No.:    WO/2018/159373    International Application No.:    PCT/JP2018/005876
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Feb 21 00:59:59 CET 2018
IPC: H01S 5/022
H01S 5/0687
Applicants: NEC CORPORATION
日本電気株式会社
Inventors: TOMITA Isao
冨田 功
Title: OPTICAL MODULE AND OPTICAL MONITORING DEVICE
Abstract:
[Problem] To reduce the occupied area on a placement surface. [Solution] An optical branching unit 111 branches emitted light into first branched light α1 and second branched light α2 and emits the same. A filter 112 transmits only a specific wavelength band of the first branched light α1 as specific light α3 and emits the same. A specific light monitoring unit 113 receives and monitors the specific light α3 transmitted through and emitted by the filter 112. An emitted light monitoring unit 114 receives and monitors the second branched light α2, without such light passing through the filter 112. The filter 112 is disposed between the optical branching unit 111 and the specific light monitoring unit 113. A plane including the first branched light α1, the second branched light α2, and the specific light α3 is provided so as to extend in a direction perpendicular to a placement surface 116a on which the specific light monitoring unit 113, the emitted light monitoring unit 114, the optical branching unit 111, and the filter 112 are placed.