Abstract

Coherent homodyne detection requires precise matching of emission wavelengths between transmitter and local oscillator at the receiver. Injection locking can provide all-optical synchronization of the emission frequencies, even under wavelength-swept emission. By adapting the sweep parameters to the conditions in the optical fiber plant, transmission impairments can be mitigated. In this regard, I experimentally demonstrate that a wavelength-hopping yet locked transceiver pair, which builds on conceptually simple externally modulated lasers, features a much higher robustness to reflection crosstalk. The reception penalty due to distortions arising at a Fresnel reflection in the light path can be reduced by $>90\%$ at a low optical signal-to-reflection ratio of $\sim 0\mathrm{dB}$.

© 2019 Optical Society of America

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