Optical transmission apparatus and bias voltage control...

Details Optical transmission apparatus and bias voltage control... Optical transmission apparatus and bias voltage control...

2006-08-15

2006-08-15

Sedighian, M. R. (Department: 2633)

Optical communications

Transmitter

Including compensation

C398S183000, C398S186000, C359S276000, C359S278000, C359S239000

Reexamination Certificate

active

07092643

ABSTRACT:
The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for taking out a part of an output optical signal, a photodiode for converting the taken-out output optical signal into an electric signal, a band pass filter for extracting a frequency component of a driving signal included in this electric signal, an error signal generator circuit for generating an error signal of a bias voltage that minimizes a value of the extracted frequency component, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.

REFERENCES:
patent: 5557648 (1996-09-01), Ishihara
patent: 6229632 (2001-05-01), Jabr
patent: 6236488 (2001-05-01), Shimizu et al.
patent: 6362913 (2002-03-01), Ooi et al.
patent: 6559996 (2003-05-01), Miyamoto et al.
patent: 1 004 920 (2000-05-01), None
patent: A5-142504 (1993-06-01), None
patent: A8-278224 (1996-10-01), None
patent: 10-115813 (A) (1998-05-01), None
patent: A2000-056279 (2000-02-01), None
patent: 2000-89176 (A) (2000-03-01), None

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