Optical communications – Transmitter – Including compensation
Reexamination Certificate
2006-10-31
2006-10-31
Sedighian, M. R. (Department: 2613)
Optical communications
Transmitter
Including compensation
C398S155000, C398S163000, C398S183000
Reexamination Certificate
active
07130545
ABSTRACT:
An electro-optic clock recovery circuit comprising an electro-optic modulator circuit operatively coupled to; a photodetector circuit; a buffer circuit operatively coupled to said photodetector circuit; a voltage controlled oscillator operatively coupled to said buffer circuit and to said electro-optic modulator circuit; wherein the electro-optic modulator circuit receives and modulates a multi-channel input data stream, the photodetector circuit responsive to the modulated input data stream drives the voltage controlled oscillator in a phase locked loop through the buffer circuit, and the modulator circuit is responsive to the voltage controlled oscillator and is driven at a harmonic of the voltage controlled oscillator. A method for the recovery of a single channel clock rate from a optical time division multiplexed data stream whose data rate is a multiple of the base rate comprising the steps of: modulating a multi-channel data stream with an electro-optic modulator circuit, detecting the modulated data steam with a photodetector circuit, controlling the frequency of a voltage controlled oscillator with the voltage associated with the photodetector circuit; driving the electro-optic modulator circuit with the output of the voltage controlled oscillator wherein the transmission window of the electro-optic modulator is toggled at a harmonic of the frequency of said voltage controlled oscillator.
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Carruthers Thomas F.
Lou Janet W.
Karasek John J.
Sedighian M. R.
Suresh Koshy
The United States of America as represented by the Secretary of
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