Patent ID: 6707589
Filing Date: 2004-03-16
Classification: G02F

Abstract:
An optical modulator drive circuit for the type of electro-optic modulator that relies on a voltage to modulate an optical signal comprising:an emitter coupled differential circuit for establishing a modulator bias level and the peak-to-peak swing of signal modulation and having a signal output and an inverted signal output; a totem pole driver circuit comprising a pull-up emitter follower transistor and a pull-down emitter follower transistor having a modulated signal output between an emitter of the pull-up transistor and a collector of the pull-down transistor, a base of the pull-up transistor coupled to the signal output and a base of the pull-down transistor coupled to the inverted signal output through a control capacitor; and the electro-optic modulator coupled to the modulated signal output of the totem pole driver circuit.