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Predistortion Compensation of Nonlinearities in Channelized RF Photonic Links Using a Dual-Port Optical Modulator

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4 Author(s)
Agarwal, A. ; Telcordia Technol., Red Bank, NJ, USA ; Banwell, T. ; Toliver, P. ; Woodward, T.K.

High dynamic range is a key requirement in analog applications. In multichannel optical signal processing applications, a wideband radio-frequency signal suffers from distortion from both in-channel and out-of-channel signals due to nonlinear modulator behavior. We demonstrate experimentally the compensation of nonlinearities occurring due to out-of-channel “cross-modulation” with a novel predistortion technique using a dual-port modulator. Predistortion compensation results in suppression of distortion by more than 25 dB.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 1 )