Optical communications – Transmitter – Including compensation
Reexamination Certificate
2011-03-01
2011-03-01
Sedighian, M. R (Department: 2613)
Optical communications
Transmitter
Including compensation
C398S182000, C398S192000, C398S195000, C398S200000, C398S201000
Reexamination Certificate
active
07899338
ABSTRACT:
A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure. An optical modulator bias controller (B) for controlling the DC bias of each optical modulating section of an optical modulator (1) is characterized by comprising DC bias application means (3) for applying a DC bias to each of the optical modulating sections, a low-frequency signal superimposing circuit (2) for superimposing a low-frequency signal fBwith a specific frequency on a modulating signal b applied to each optical modulating section, optical sensing means (9) for sensing a change of the intensity of the light wave passing through the combining section, and bias control means (4) for extracting the change of the intensity of light corresponding to the low-frequency signal from the optical sensing means and controlling the DC bias application means according to the extracted change of the intensity of light.
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Higuma, K., et al. (2002) X-cut LiNbO3 Optical SSB-SC Modulator, Technical Report 2002, Advanced Materials and Opto-Electronics, Sumitomo Osaka Cement Co., Ltd., 17-21.
Fujita Takahisa
Hashimoto Yoshihiro
Higuma Kaoru
Ichikawa Junichiro
Chapman and Cutler LLP
Dobson Daniel G
Sedighian M. R
Sumitomo Osaka Cement Co. Ltd.
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