Abstract
A novel concept of individually switchable and widely tunable erbium-doped
multiwavelength fiber laser (MWFL) is proposed and experimentally demonstrated.
The key component of the laser is a channel transmissivity individually variable
comb filter composed of two cascaded different-length long-period fiber gratings
(LPFGs), named cascaded mismatching LPFGs. When inserted into the laser cavity,
this polarization-dependent comb filter functions as the wavelength selector
and switching filter simultaneously. By properly adjusting the polarization
controllers (PCs) in the laser cavity and in the high birefringence Sagnac
loop mirror (HiBi-SLM), eleven individually switchable wavelengths with different
flexible lasing states, including successively tunable adjacent single-, dual-
and triple-wavelength outputs, nonadjacent dual- and triple-wavelength
outputs, as well as quadruple- and quintuple-wavelength outputs, have been
achieved. This MWFL may be useful in optical fiber sensing or other fields
desiring very flexible optical source.
© 2011 IEEE
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