发明授权
- 专利标题: Optical receiver and method of detecting loss of optical signal of the optical receiver
- 专利标题(中): 光接收机和光接收机光信号丢失检测方法
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申请号: US12477153申请日: 2009-06-03
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公开(公告)号: US08798459B2公开(公告)日: 2014-08-05
- 发明人: Masaaki Furukawa , Kouhei Sagara
- 申请人: Masaaki Furukawa , Kouhei Sagara
- 申请人地址: JP Kanagawa
- 专利权人: Oclaro Japan, Inc.
- 当前专利权人: Oclaro Japan, Inc.
- 当前专利权人地址: JP Kanagawa
- 代理机构: Antonelli, Terry, Stout & Kraus, LLP.
- 优先权: JP2008-146589 20080604
- 主分类号: H04B10/08
- IPC分类号: H04B10/08 ; H04B17/00
摘要:
The optical receiver includes: a photoelectric conversion circuit for receiving an optical signal and converting the received optical signal into an electrical signal; a comparator for outputting a first determination signal (S1) when a voltage corresponding to the optical signal does not reach a first threshold value (TH1) and for canceling an output of the S1 when the voltage corresponding to the optical signal exceeds a second threshold value larger than TH1 during the S1 is output; a timing extraction circuit for generating a clock signal based on a frequency and a phase of the electrical signal obtained by the converting and for outputting a second determination signal (S2) when the generated clock signal does not satisfy a predetermined condition; a unit for causing the comparator to output the S1 when the S2 is output; and detects loss of optical signal while one of the S1 and S2 is output.