Driving circuit for an optical signal modulator

Details Driving circuit for an optical signal modulator Driving circuit for an optical signal modulator

1996-06-25

1998-09-08

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359181, G02F 103

Patent

active

058053280

ABSTRACT:
An LN (Lithium Niobate) modulator outputs light Po modulated using a modulation voltage Vm. An inputted light signal average level monitor is arranged at the input of the LN modulator. Further, an outputted light signal average level monitor is arranged at the output of the LN modulator. A negative feedback circuit controls the feeding back of a bias voltage applied to the modulator from the average level of the input signal and the average level of the output signal. Further, a bias voltage limiter performs control in such a manner that the center of the voltage limiting range for the bias voltage becomes the optimum operating point. This bias voltage limiter has: a voltage limiter for limiting the operating output range of an op-amp to be a prescribed voltage range; an integrator for applying an offset voltage to and shifting the limiting voltage of the voltage limiter; and a difference monitor for monitoring the difference between a modulation voltage Vm and an offset voltage .increment.V. The integrator generates an offset voltage based on shift information monitored by the difference monitor, with this offset voltage being provided to the voltage limiter. The voltage limiter then shifts the voltage control range in response to the provided offset voltage.

REFERENCES:
patent: 5347392 (1994-09-01), Chen et al.

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