Title:
光受信器
Document Type and Number:
Japanese Patent JP5420977
Kind Code:
B2
Abstract:
The interference phases of two optical delay line interferometers of an optical receiver adopting the DQPSK or the like are stabilized at points, which have a difference of 90°, without bifurcation of a receiving signal or receiving data. A low-speed photocurrent flowing through the current source terminal of a photodetector that receives interfering light outputted from an optical delay line interferometer is detected. The interference phase is identified by utilizing a variation in the AC or DC component of the photocurrent dependent on the interference phase of the optical delay line interferometer. The difference between the interference phases of two optical delay line interferometers is controlled to be 90°.
Inventors:
Bandai Kohei
Application Number:
JP2009137113A
Publication Date:
February 19, 2014
Filing Date:
June 08, 2009
Export Citation:
Assignee:
Japan Oclaro Co., Ltd.
International Classes:
H04B10/40; H04B10/69; G02F2/00; H04B10/07; H04B10/50; H04B10/516; H04B10/548; H04B10/564; H04B10/60; H04B10/61; H04B10/67
Domestic Patent References:
| JP2007043638A | ||||
| JP2008271524A | ||||
| JP2009232330A |
Foreign References:
| WO2010087011A1 |
Attorney, Agent or Firm:
Haruka International Patent Office