Invention Grant
- Patent Title: Preamplifier, optical receiver, optical termination device, and optical communication system
- Patent Title (中): 前置放大器，光接收器，光终端设备和光通信系统
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Application No.: US14413483Application Date: 2013-01-16
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Publication No.: US09450542B2Publication Date: 2016-09-20
- Inventor: Daisuke Mita , Masaki Noda , Masamichi Nogami
- Applicant: Daisuke Mita , Masaki Noda , Masamichi Nogami
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Electric Corporation
- Current Assignee: Mitsubishi Electric Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P
- International Application: PCT/JP2013/050660 WO 20130116
- International Announcement: WO2014/112051 WO 20140724
- Main IPC: H03F3/08
- IPC: H03F3/08 ; H03G3/30
Abstract:
A current bypass circuit that passes part of a photocurrent output from a photodetector is connected to an input terminal of a current-to-voltage conversion amplifier circuit. A voltage obtained by level conversion of an output voltage by a voltage level conversion circuit is input into the current bypass circuit so that the current bypass circuit is turned on at a photocurrent that is smaller than the photocurrent at which a diode connected in parallel to a feedback resistor of the current-to-voltage conversion amplifier circuit is turned on. Consequently, the current-to-voltage conversion gain is switched in three stages according to the intensity of the photocurrent corresponding to an optical signal level.
Public/Granted literature
- US20150207469A1 PREAMPLIFIER, OPTICAL RECEIVER, OPTICAL TERMINATION DEVICE, AND OPTICAL COMMUNICATION SYSTEM Public/Granted day:2015-07-23
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