Asymmetrical distributed feedback fiber laser
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Aug 9, 1999
filing date -
Nov 4, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A DFB fiber laser comprises a single-mode, rare-earth doped optical fiber having a uniform Bragg grating with a reflectivity of about 90%, and a single-mode, hi-birefringent optical fiber having a uniform Bragg grating with a reflectivity of near 100%. The output end of the hi-bi fiber is coupled to the input end of the doped fiber to form an asymmetrical fiber laser cavity. The input end of the hi-bi fiber is pumped by a light source (laser diode) having a wavelength in the absorption range of the doped fiber. Pump light entering the hi-bi fiber is passed into the doped fiber to produce a stimulated output. The hi-bi fiber provides single polarization operation, acts as an end reflector to provide single longitudinal mode operation in the laser cavity while also providing single sided output.
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