Abstract
An optimized dual fiber Bragg grating (FBG) is proposed for 980-nm
semiconductor lasers without thermoelectric coolers to restrict temperature-induced
wavelength shift. The mathematical model of the temperature-induced wavelength shift
of the laser with the dual FBG is built using the external cavity feedback rate
equations. The external cavity parameters are optimized for achieving the stability
mode-locking laser output. The spectral characteristics of the dual FBG stabilized
laser are measured to range from 0 to 70 oC. The side mode suppression ratio (SMSR)
is more than 45 dB, while the full-width at half-maximum (FWHM) is less than 1 nm.
The peak wavelength shift is less than 0.1 nm. The dual FBG wavelength shift
proportional coefficient is between 0.1086 and 0.4342.
© 2011 Chinese Optics Letters
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