Abstract
In coherent optical communication systems, the Costas loop is one of the promising optical phase-locked-loop (OPLL) candidates for realizing a homodynebaseband receiver.1 This work focuses on two objectives. One objective is the realization of a compact, stable, and low-loss optical 90° hybrid1,2 as an indispensable device in the Costas loop. The other is overcoming the difficulty of controlling the phase of the local-oscillator laser without losing its narrow linewidth and frequency stability. The latter objective is accomplished by adopting external optical phase control instead of direct feedback of phase error signal.
© 1991 Optical Society of America
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