Optical modulation device having bias reset means

Details Optical modulation device having bias reset means Optical modulation device having bias reset means

H - Electricity

04

B

H04B 10/145 (2006.01) G02F 1/01 (2006.01)

Patent

CA 2162078

An optical modulation device comprises an optical modulator in which the operating point is varied according to a bias voltage. A phase deviation of an operating point from a selected optimal operating point is detected by a phase comparator based on an output light of the optical modulator. The bias voltage is generated within a predetermined voltage range by a DC amplifier so as to reduce the phase deviation. A reset circuit resets the bias voltage at the ground voltage associated with the selected optimal operating point when the optical modulator is powered up and passes the bias voltage to the optical modulator at all other times.

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