title: Dynamic range enhancement of a novel phase-locked coherent optical phase demodulator.
abstract: We report on a novel cancellation technique, for reducing the nonlinearity associated with the tracking phase-modulator in recently proposed phase-locked coherent demodulator for phase modulated analog optical links. The proposed cancellation technique is input RF signal power and frequency independent leading to a significant increase in dynamic range of the coherent demodulator. Furthermore, this technique demonstrates that large values of the signal-to-intermodulation ratio of the demodulated signal can be obtained even though the tracking phase modulator is fairly nonlinear, and thereby relaxing the linearity requirements for the tracking phase modulator. A new model is developed and the calculated results are in good agreement with measurements.
authors.forename: Darko
authors.initials: D
authors.lastname: Zibar
authors.forename: Leif A
authors.initials: LA
authors.lastname: Johansson
authors.forename: Hsu-Feng
authors.initials: HF
authors.lastname: Chou
authors.forename: Anand
authors.initials: A
authors.lastname: Ramaswamy
authors.forename: John E
authors.initials: JE
authors.lastname: Bowers