Title:
OPTICAL RECEIVER FOR COHERENT COMMUNICATION AND CONTROL METHOD THEREOF
Document Type and Number:
Japanese Patent JP2015037276
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To individually improve CMRR for each channel.SOLUTION: An optical receiver for coherent communication includes: a photodiode array PDA for outputting two of in-phase/reversed-phase input photocurrent signals by converting two of in-phase/reversed-phase optical signals on an arbitrary channel, obtained by demodulating an input signal light, with two photodiodes PD corresponding to each photocurrent signal; and a transimpedance amplifier IC, having a built-in variable gain transimpedance amplifier whose gain difference between positive and negative input is adjustable, for outputting a received voltage signal on the channel by differentially amplifying two input photocurrent signals outputted by the photodiodes PD. A variable gain amplifier, included in the transimpedance amplifier IC, differentially amplifies two input photocurrent signals outputted by the photodiodes PD after adjusting the gain difference, and outputs the amplified signal.
Inventors:
ITO TOSHIHIRO
NOSAKA HIDEYUKI
MURATA KOICHI
NOSAKA HIDEYUKI
MURATA KOICHI
Application Number:
JP2013168810A
Publication Date:
February 23, 2015
Filing Date:
August 15, 2013
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04B10/61; G02F2/00
Domestic Patent References:
| JP2011193347A | 2011-09-29 |
Foreign References:
| WO2013015391A1 | 2013-01-31 | |||
| WO2013046284A1 | 2013-04-04 | |||
| WO2008072476A1 | 2008-06-19 | |||
| WO2011132759A1 | 2011-10-27 |
Other References:
JPN6015037547; Ｙ． Ｓａｋａｍａｋｉ 他: '「Ｄｕａｌ ｐｏｌａｒｉｓａｔｉｏｎ ｏｐｔｉｃａｌ ｈｙｂｒｉｄ ｕｓｉｎｇ ｓｉｌｉｃａ-ｂａｓｅｄ ｐｌａｎａｒ ｌｉｇｈｔｗａｖｅ ｃｉｒｃｕｉｔ ｔｅｃｈｎｏｌｏｇｙ ｆｏｒ ｄｉｇｉｔａ' ＥＬＥＣＴＲＯＮＩＣＳ ＬＥＴＴＥＲＳ Ｖｏｌ． ４６ Ｎｏ． １, 20100107
JPN6015037548; Ｔ． Ｉｎｏｕｅ 他: '「Ｄｏｕｂｌｅ-Ｐａｓｓ ＰＢＳ-Ｉｎｔｅｇｒａｔｅｄ Ｃｏｈｅｒｅｎｔ Ｍｉｘｅｒ Ｕｓｉｎｇ Ｓｉｌｉｃａ-ｂａｓｅｄ ＰＬＣ」' ＯＦＣ／ＮＦＯＥＣ ２０１０ , 201003
JPN6015037548; Ｔ． Ｉｎｏｕｅ 他: '「Ｄｏｕｂｌｅ-Ｐａｓｓ ＰＢＳ-Ｉｎｔｅｇｒａｔｅｄ Ｃｏｈｅｒｅｎｔ Ｍｉｘｅｒ Ｕｓｉｎｇ Ｓｉｌｉｃａ-ｂａｓｅｄ ＰＬＣ」' ＯＦＣ／ＮＦＯＥＣ ２０１０ , 201003
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Yuzo Koike
Shigeki Yamakawa
Yuzo Koike
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