DC bias controller for optical modulator

Details DC bias controller for optical modulator DC bias controller for optical modulator

1995-12-27

1998-03-10

Moskowitz, Nelson

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359177, 359183, 330 97, H01S 300, H04L 2506, G02F 103

Patent

active

057267944

ABSTRACT:
A DC bias controller for an optical modulator includes an optical modulator, a demultiplexer, and a controller. The optical modulator intensity-modulates input DC light by a digital main signal superposed with a DC voltage to convert the DC light to an optical signal. The demultiplexer demultiplexes the optical signal from the optical modulator into output signal light and monitor signal light. The controller detects a change in modulation characteristics of the optical modulator on the basis of the monitor signal light from the demultiplexer to control a value of the DC voltage superposed on the digital main signal.

REFERENCES:
patent: 5175749 (1992-12-01), Ficht et al.
patent: 5389839 (1995-02-01), Heck
patent: 5570227 (1996-10-01), Nabeyama et al.
Kataoka et al, Trans. Inst. Electron. Inf. Commun. Eng. B-I (Japan), vol. J76B-I, #4 pp. 364-371, Apr. 1993; Abst Only Herewith.

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