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13 April 2007Mode-locked in external cavity fiber Bragg grating lasers
Mode-locking characteristic of hybrid soliton pulse source (HSPS) utilizing linearly chirped raised-cosine flat top
apodized fiber Bragg grating (FBG) is investigated by using coupled-mode equations. It is found that the fundamental
repetition frequency range of HSPS is significantly extended by using linearly chirped raised-cosine flat top apodized
FBG instead of linearly chirped Gaussian apodized FBG. The range of repetition frequencies over which proper modelocking
is obtained is 2-3.3 GHz with linearly chirped raised-cosine flat top apodized grating whereas this range is 2.1-
2.95 GHz with linearly chirped Gaussian apodized grating.