Title:
OPTICAL RECEIVER
Document Type and Number:
WIPO Patent Application WO/2010/050124
Kind Code:
A1
Abstract:
Provided is a method for controlling a variable spread compensator which can be accurately controlled with a cheap configuration and even under a high SNR condition in an optical receiver of a long-distance high-speed WDM/OADM system.
The method acquires signal reception characteristic data (code error ratio, clock extraction enabled/disabled result, frame synchronization enabled/disabled result) and derives an optimal spread compensation amount of the spread compensator. When these signal reception characteristic data are saturated because of a high SNR and it is impossible to obtain a desired spread control accuracy, the input level of a photodiode is lowered by controlling the output level of an amplifier or a variable-light attenuator, so as to acquire the signal reception characteristic data in the state of degraded reception SNR and re-derive the optimal spread compensation amount of the spread compensator.
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Inventors:
SEKINE, Kenro (Hitachi Ltd., 216, Totsuka-cho, Totsuka-ku, Yokohama-sh, Kanagawa 67, 〒2448567, JP)
Application Number:
JP2009/005159
Publication Date:
May 06, 2010
Filing Date:
October 05, 2009
Export Citation:
Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
株式会社日立製作所 (〒80 東京都千代田区丸の内一丁目６番６号 Tokyo, 〒1008280, JP)
株式会社日立製作所 (〒80 東京都千代田区丸の内一丁目６番６号 Tokyo, 〒1008280, JP)
International Classes:
H04B10/02; H04B10/00; H04B10/04; H04B10/06; H04B10/14; H04B10/18; H04B10/24; H04B10/26; H04B10/28
Attorney, Agent or Firm:
Polaire I.P.C. (7-1Hatchobori 2-chome, Chuo-ku Tokyo, 32, 〒1040032, JP)
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