Abstract
We have realized a novel tunable narrow linewidth fiber laser with single-longitudinal-mode
operation based on the homogenous gain broadening effect of Er-doped fiber
and the stimulated Rayleigh scattering (STRS) in a nonuniform optical fiber
in a ring laser configuration. A 3 dB linewidth of less than 2.0 kHz is achieved
with 70 dB extinction. The minimum tunable laser bandwidth is determined by
the balance of the bandwidth of tunable bandpass filter (in GHz), relaxation
time and gain of the Er-doped fiber, and cavity loss. The tuning range is
determined by the range of tuning filter within Er-doped fiber gain spectrum.
This technique is applicable to any fiber with much higher stimulated Brillouin
scattering threshold than that of STRS.
© 2011 IEEE
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