Abstract
In this paper, we investigate a flexibly tunable multiwavelength fiber ring laser with a continuous wavelength
spacing tunability, incorporating a superimposed chirped fiber Bragg grating (CFBG) at room temperature. We exploit
versatile gain media such as erbium-doped fiber (EDF) and Raman amplifiers in generating the multiwavelength fiber
ring laser. The wavelength spacing of a superimposed CFBG can be continuously controlled by modifying the chirp
ratio of the grating with the specially designed apparatus. After configuring a fiber ring cavity with the proposed
multichannel filter, we realize stable multiwavelength fiber ring lasers at room temperature, which are based on an
EDF amplifier incorporating a highly nonlinear dispersion-shifted fiber or a Raman amplifier using a
dispersion-compensated fiber. Power fluctuation is less than ~0.6 dB. No lasing wavelength change is severally observed for the whole tuning range. For the
multiwavelength EDF laser, stable 11-wavelength simultaneous operation spaced at 0.51 nm, with a signal-to-noise
ratio (SNR) of more than ~45 dB at room temperature, is
achieved. A high-quality multiwavelength Raman laser output with stable 30 lasing wavelengths spaced at 0.51 nm with
a high SNR of more than ~45 dB is also realized. By applying
the proposed tuning technique to both the multiwavelength EDF and Raman lasers, a wide and continuous tunability of
lasing wavelength spacing is successfully achieved, which is measured to be ~±0.033 nm/mm. By controlling the pump power in the multiwavelength Raman fiber ring laser, we can
control the number of lasing channels at a wavelength spacing of 0.51 nm.
© 2007 IEEE
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