Abstract
In the realization of very-high-speed optical communication systems, all-optical clock extraction is one of the most basic functions in regenerators and multiplexers. A remarkable experiment of 40-GHz all-optical clock recovery, using a fiber nonlinear modulator (NOM) and a fiber-ring cavity, has been reported by Ellis et al.1 However, such fiber devices increase the circuit delay because optical gain and interaction between optical pulses are usually lower in glass fibers than in semiconductor devices. The use of a semiconductor laser will be key to realizing small-delay optical circuits. Takayama and Habara2 have reported on a 3.2-Gbit/s optical clock-recovery circuit using an optically active cavity that operates alternately on the TE and the TM waves.
© 1994 Optical Society of America
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