Title:
光送信器
Document Type and Number:
Japanese Patent JP4563944
Kind Code:
B2
Abstract:
An optical DQPSK modulator comprises a pair of phase modulators. Each of the pair of the phase modulators is provided with first and second driving signals. The first and second driving signals are amplified by first and second amplifiers, respectively. An RZ intensity modulator generates an optical RZ-DQPSK signal from an optical DQPSK signal output from the optical DQPSK modulator. A photodetector generates a monitor signal from the optical RZ-DQPSK signal. A gain adjuster unit adjusts the gains of the first and second amplifiers so as to minimize the power of the monitor signal.
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Inventors:
Yuichi Akiyama
Application Number:
JP2006023111A
Publication Date:
October 20, 2010
Filing Date:
January 31, 2006
Export Citation:
Assignee:
富士通株式会社
International Classes:
H04B10/516; G02F1/01; H04B10/07; H04B10/2507; H04B10/54; H04B10/556; H04B10/564; H04B10/61
Domestic Patent References:
| JP2004070130A | ||||
| JP2004254242A | ||||
| JP2001308792A | ||||
| JP5224163A | ||||
| JP2000162563A | ||||
| JP2005151565A | ||||
| JP7046190A |
Attorney, Agent or Firm:
Yoshiyuki Osuga
Motoaki Hisagi
Motoaki Hisagi