Title:
OPTICAL TRANSMITTER, AND BIAS VOLTAGE CONTROL METHOD FOR OPTICAL MODULATOR USED THEREFOR
Document Type and Number:
Japanese Patent JP3765967
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To easily control a bias voltage even in ≥10 GHz band of a driving signal, and to prevent the quality of an optical output signal from being deteriorated due to deterioration in waveform.
SOLUTION: This optical transmitter is provided with a Mach-Zehnder type light modulator 3, a light source 1 for inputting an optical signal of continuous light to the Mach-Zehnder optical modulator 3, a driving circuit 24 for inputting a driving signal to the Mach-Zehnder optical modulator 3, a demultiplexer 4 for taking out a part of the output optical signal, a photodiode 5 for converting the taken-out output optical signal into an electric signal, a band-pass filter 16 for extracting the frequency components of the driving signal contained in this electric signal, an error signal generating circuit 7 for generating an error signal of a bias voltage minimizing a value of the taken-out frequency components, and a bias voltage control circuit 10 for applying a bias voltage summed with this error signal to the Mach-Zehnder optical modulator 3.
Inventors:
Kajiya Satoshi
Kazuyuki Ishida
Katsuhiro Shimizu
Yukio Kobayashi
Kazuyuki Ishida
Katsuhiro Shimizu
Yukio Kobayashi
Application Number:
JP2000199898A
Publication Date:
April 12, 2006
Filing Date:
June 30, 2000
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G02F1/01; G02F1/03; G02F1/035; G02F1/225; H04B10/07; H04B10/2507; H04B10/516; H04B10/524; H04B10/588; H04B10/61; (IPC1-7): G02F1/03; G02F1/035; H04B10/152; H04B10/142; H04B10/04; H04B10/06
Domestic Patent References:
| JP10115813A | ||||
| JP53038338A | ||||
| JP52018344A | ||||
| JP2000162563A | ||||
| JP200089176A |
Other References:
Electron.Lett.,1999年,Vol.35,No.23,2041-2042
Attorney, Agent or Firm:
Hiroaki Sakai
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