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Hybrid soliton pulse source using a silica waveguide external cavity and Bragg reflector

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Abstract

The realization of long distance soliton-based transmission systems requires a reliable, stable source of transform limited pulses at 1.55 μm with a pulsewidth of 30-60 ps, at repetition rates of 2.5-5.0 GHz. This requires a very narrow optical bandwidth. Wavelength-division multiplexing of solitons also requires accurate wavelength control. External cavity lasers utilizing air cavities require the alignment of bulk optics, together with a diffraction grating and etalon. Integrated structures provide an attractive alternative, with monolithic mode-locked lasers1-3 providing pulses at high repetition rates. The hybrid soliton pulse source (HSPS) is an ideal candidate for a practical source for soliton transmission systems (Fig. 1). Low-loss silica waveguides allow long cavity lengths and therefore low repetition rates, and a high level of fabrication control (silicon optical bench technology4) allows precise control of operating wavelength and extremely narrow Bragg reflectors.

© 1992 Optical Society of America

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