Control of an optical modulator for desired biasing of data...

Optical communications – Transmitter – Having particular modulation

Reexamination Certificate

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C398S037000, C398S185000, C398S186000, C398S188000, C398S198000

Reexamination Certificate

active

07394992

ABSTRACT:
In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add return-to-zero encoding to the modulated optical signal. A modulator controller monitors the output optical signal power, optimizes the bias setting for the DM and the PM, and optimizes the phase relationship between the pulse and data components of the modulated optical signal. For each optimization, a low amplitude and low frequency dither signal is injected at appropriate points in the modulator. A single photo detector and electrical receiver are used in a multiplexed fashion to monitor the optical output signal and derive separate feedback signals. Remaining control circuitry forces a null in a respective residual dither component in the optical output signal to maintain the desired bias level or phase alignment.

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Esman et al., “Wideband Efficiency Improvement of Fiber Optic Systems by Carrier Subtraction”, IEEE Photonics Technology Letters, vol. 7, No. 2, Feb. 1995.
Photonic Systems, Inc., Model 0203, Large-Signal Modulator Bias Controller, Specification Information.
Photonic Systems, Inc., Model 0202, Modulator Bias Controller, Specification Information.

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