Apparatus and method for automatically correcting bias...

Details Apparatus and method for automatically correcting bias... Apparatus and method for automatically correcting bias...

2006-07-11

2006-07-11

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

07075694

ABSTRACT:
The present invention relates to an apparatus and method for automatically correcting a bias voltage for a carrier suppressed pulse generating modulator using the phase distribution of the output pulses, which automatically detects an optimal bias voltage for the carrier suppressed pulse generating modulator and stabilizes the bias voltage.In the bias voltage automatic correction method and apparatus of the present invention, an optimal bias voltage for the modulator is set to a bias voltage that is obtained when mean power of an optical signal output from the modulator is highest. The varying direction of the bias voltage is detected on the basis of the phase variations in the output optical signal of the modulator according to the bias voltage variations is detected, and the bias voltage is corrected oppositely to the varying direction of the bias voltage.

REFERENCES:
patent: 5003624 (1991-03-01), Terbrack et al.
patent: 5495359 (1996-02-01), Gertel et al.
patent: 6204954 (2001-03-01), Nagarajan
patent: 6317247 (2001-11-01), Yang et al.
patent: 6580544 (2003-06-01), Lin et al.
Journal of Lightwave Technology, vol. 20, No. 4, Aprl. 2002, pp. 598-607.
Electronics Letters, May 23, 1991, vol. 27, No. 11, pp. 943-945.

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