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We describe techniques for phase-locked coherent optical communications, including wavelength synthesis for wavelength-division-multiplexed optical communications, compact coherent BPSK receivers, and coherent demodulation of WDM in the electrical domain. Index Terms - Coherent optical communications, phase-locked-loops, frequency synthesis, wavelength-division-multiplexing.
The frequency down-converter is an essential element of a photonic radar frontend. In this paper we describe a new photonic frequency down-conversion approach employing a quadratic optical phase modulator. When paired with an OPLL linear phase demodulator, this approach can potentially achieve a large dynamic range and a low conversion loss. A preliminary experiment has been performed to verify frequency...
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