Forced Phase Modulation and Self Phase Modulation Effects in Dispersion-Tuned Mode-Locked Fiber Lasers

Kohichi TAMURA  Eiji YOSHIDA  Masataka NAKAZAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.2   pp.195-200
Publication Date: 1998/02/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Ultrashort Optical Pulse Technologies and their Applications)
Category: 
Keyword: 
fiber,  laser,  mode-locking,  phase modulation,  

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Summary: 
The effects of forced phase modulation (FPM) and self phase modulation (SPM) in dispersion tuned fiber lasers (DTFL) are examined. We show that FPM, such as chirp in the modulator, plays an important role in the pulse shaping because of the important role of dispersion in the cavity. In particular, compared to the case of zero FPM, significant pulse shortening can be obtained by using up-chirp modulation. The results suggest that modulators with large chirp parameters are desirable for DTFLs. When SPM is introduced, the pulse shapes differ greatly depending on the direction of the FPM. Significant deviations from Gaussian profiles are observed.