Abstract

A pulse train with a repetition rate of 115 GHz was obtained at 1.55 $\mathit{\mu }\mathrm{m}$ from a continuous-wave modulational-instability erbium-doped fiber laser. This laser has a Fabry–Perot filter whose free spectral range is set at 115 GHz, corresponding to the modulational-instability gain peak. This filter enables us to initiate modulational instability easily with a low threshold and produce a stable, continuous-wave pulse train. The stability of the pulse train is greatly improved by suppression of supermode noise with a combination of self-phase modulation and a narrow-band optical filter.

© 1997 Optical Society of America

Low-threshold self-induced modulational instability ring laser in highly nonlinear fiber yielding a continuous-wave 262-GHz soliton train

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Modulational-instability σ-resonator fiber laser

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