Abstract

The use of guided-wave Mach–Zehnder interferometers to generate dark solitons with constant background is further examined. Under optimal conditions, both the input optical power and the driving voltage can be reduced by 30% as compared with the case of complete modulation. Dark solitons are also found to experience compression through amplification. When the gain coefficient is small, adiabatic amplification is possible. Besides being used for loss compensation, Raman amplification can be used as the gain mechanism for adiabatic amplification. The frequency and time shifts caused by intrapulse stimulated Raman scattering are both found to be smaller than those for bright solitons by a factor of 2. Finally, the propagation properties of even dark pulses are described quantitatively.

© 1992 Optical Society of America

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