Abstract
Sources of ultrashort soliton pulses are essential for any future implementation of ultrafast (~100 Gbit/s) communications systems. Figure-eight erbium-fiber lasers (F8L’s) mode locked with a nonlinear amplifying loop mirror (NALM) have been demonstrated as sources of subpicosecond pulses, with several groups reporting lengths of approximately 300 fs.1 The pulses typically consist of a soliton-like component and a dispersive component shed from the main pulse by the variation with amplification and loss of the pulse energy from E1(τ), the energy of a fundamental soliton of width τ. This dispersive wave is resonantly enhanced at specific wavelengths by the periodicity over a cavity round trip, yielding a characteristic sideband spectrum seen in subpicosecond F8L’s.1–3
© 1993 Optical Society of America
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