Abstract
We demonstrate a novel approach for coherently detecting
microwave-modulated optical phase through interferometric phase detection
and an optical phase-locked loop (OPLL). An asymmetric interferometer converts
phase modulation into intensity modulation for direct detection. The optical
phase in the interferometer is modulated by the detected signal through an
OPLL. Balanced detection is achieved by biasing the interferometer at its
quadrature point to cancel common-mode intensity noise and even-order nonlinear
distortions. The concept was validated experimentally at a frequency of 25.7
MHz, limited by the large loop delay associated with discrete optical components.
A numerical simulation is used to project system operation beyond the limitations
of the experiment, showing that the linearity performance of the interferometric
phase detector may be significantly improved by signal feedback.
© 2008 IEEE
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