Abstract
Two types of erbium-doped fiber lasers based on Sagnac
interferometer incorporated with fiber grating are
proposed and experimentally demonstrated, which
effectively support tunable and switchable
dual-wavelength single-longitudinal-mode laser
operation. The mode selection is implemented by use of
the Sagnac interferometer with fiber grating, an
umpumped erbium-doped fiber, and a tunable fiber Bragg
grating. The Sagnac interferometer with fiber grating
plays the role as a narrowband comb filter, while the
unpumped erbium-doped fiber together with the tunable
fiber Bragg grating essentially forms a passive
self-tracking filter to ensure a stable
single-longitudinal-mode fiber laser operation. By use
of the Sagnac interferometer with chirped fiber Bragg
grating, tunable microwave signals can be generated by
beating the dual wavelengths, within the frequency range
between ${\sim} {\hbox {9.8}}$ and ${\sim} {\hbox {14}}$ GHz.
© 2010 IEEE
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