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Integrated all-optical fiber source of a multigigahertz soliton pulse train

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Abstract

Simple and reliable sources of optical pulses capable of operating at high repetition rates in the 10-100-GHz range beyond the limits of conventional electronics are of interest for the next generation of optical telecommunication and optoelectronics systems. Here, we report a 60-GHz soliton pulse source that uses all-optical fiber technology. The principle of operation is based on an all-optical technique that uses an optical beat signal as a source of a periodic optical signal and the transformation of the beat half-periods into optical pulses by using nonlinear propagation in optical fiber. A special dispersion-decreasing fiber in conjunction with two independent distributed-feedback laser diodes amplified in an erbium-doped fiber amplifier and used for beat-signal generation has been previously demonstrated for soliton-train generation.1-3 Our novel technique relies on a new type of optical fiber, which we call comblike-dispersion-profiled fiber (CDPF), designed by a chain of alternating segments of conventional standard telecommunication fibers (STF) and dispersion-shifted fibers (DSFs). The implementation of CDPF permits the generation of a high-quality soliton pulse train and the use of a narrow-linewidth, low-phase-noise input beat signal owing to suppression of the stimulated Brillouin scattering (SBS) in a properly designed CDPF.

© 1994 Optical Society of America

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