Abstract

We report the frequency stabilization of an erbium-doped fiber distributed-feedback laser using an all-fiber-based Michelson interferometer of large arm imbalance. The interferometer uses a 1km SMF-28 optical fiber spool and an acousto-optic modulator allowing heterodyne detection. The frequency-noise power spectral density is reduced by more than 40dB for Fourier frequencies ranging from 1Hzto10kHz, corresponding to a level well below 1Hz2Hz over the entire range; it reaches 102Hz2Hz at 1kHz. Between 40Hz and 30kHz, the frequency noise is shown to be comparable to the one obtained by Pound–Drever–Hall locking to a high-finesse Fabry–Perot cavity. Locking to a fiber delay line could consequently represent a reliable, simple, and compact alternative to cavity stabilization for short-term linewidth reduction.

© 2009 Optical Society of America

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