Abstract
We investigate the coupling between a small-core-diameter dispersion compensation
fiber (SC-DCF) and a single-mode fiber (SMF) and its applications in fiber lasers. The
number of interference modes and the power distributed in the interference modes can be
selected by controlling the coupling between the core of the SC-DCF and that of an SMF,
which can be used to select the lasing oscillation range. Interference pattern with a
narrow free spectral range can be obtained with a shorter length of the SC-DCF based
intermodal interferometer comparing to that constructed by the common multimode fiber.
With the SC-DCF incorporated in an erbium-doped fiber laser (EDFL) cavity, under three
different selected coupling conditions, stable dual/triple wavelength switchable EDFLs
in three different wavelength ranges are, respectively, achieved by tuning the
polarization state of the laser cavity. We also demonstrate its application in
four-wave-mixing-based multiwavelength switchable tunable EDFLs. A stable operation of
34 lasing wavelengths is obtained. Multiwavelength switchable tunable EDFLs in two
different wavelength ranges are also achieved by controlling the coupling and
polarization state of the laser cavity simultaneously.
© 2010 IEEE
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