Abstract
We show that induced absorption1 in erbium at wavelengths near 1.65 µm is crucial for counteracting soliton self-frequency shift2 (SSFS), thus enabling picosecond soliton pulses to propagate stably along a distributed erbium-doped fiber amplifier (DEDFA). SSFS, which refers to the downslide of the soliton center frequency due to the intrapulse Raman effect, is particularly disastrous for short pulse propagation in optical fibers since the shift scales as the inverse fourth power of the pulse width. We present a perturbational analysis that determines the conditions for stable soliton trapping. For example, a 1.65-ps pulse can be trapped in a DEDFA with a doping level of 1 ppm.
© 1994 Optical Society of America
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