Optical modulation apparatus

Details Optical modulation apparatus Optical modulation apparatus

2008-12-23

2010-11-02

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

07826122

ABSTRACT:
An optical modulation apparatus that performs optimum bias voltage control for optical modulation without using a pilot tone. A drive unit generates a drive signal by adding a bias voltage to an input data signal. A light modulation unit modulates input light output from a light source unit, in accordance with the drive signal, and outputs the results as optical signals. A forward monitoring unit monitors a forward signal of the light modulation unit and outputs the forward signal. A reverse monitoring unit monitors a reverse signal of the light modulation unit and outputs a reverse signal. A bias control unit controls the bias voltage so that a measured monitor ratio matches a target value of the ratio between the forward signal and the reverse signal, obtained when the operating point of the light modulation unit is in a predetermined position on its operation characteristic curve.

REFERENCES:
patent: 7075694 (2006-07-01), Jang et al.
patent: 2004/0161249 (2004-08-01), Suda et al.
Patent Abstracts of Japan, Publication No. 2004-247968, published Sep. 2, 2004.
Patent Abstracts of Japan, Publication No. 3-251815, published Nov. 11, 1991.
Patent Abstracts of Japan, Publication No. 2001-339346, published Dec. 7, 2001.
Patent Abstracts of Japan, Publication No. 2008-092172, published Apr. 17, 2008.

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