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Pulse-train uniformity in optical fiber lasers passively mode-locked by nonlinear polarization rotation

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3 Author(s)
A. D. Kim ; Dept. of Appl. Math., Washington Univ., Seattle, WA, USA ; J. N. Kutz ; D. J. Muraki

The generation of uniform soliton pulse trains by additive pulse mode locking has been experimentally demonstrated in a birefringent fiber laser with a passive polarizer. Numerical simulations of pulse propagation around such a fiber loop are presented which reveal that this mode-locking scheme does not result in strictly uniform pulse trains. Rather, the train of output pulses exhibits periodic fluctuations in intensity and polarization. A model for the pulse dynamics is developed which shows that these fluctuations depend on the strength of the fiber birefringence and the alignment of the polarizer with the fast- and slow-polarization axes of the fiber. It is also shown that increased uniformity of pulse trains is achieved with near alignment of the polarizer with the slow axis of the birefringence.

Published in:

IEEE Journal of Quantum Electronics  (Volume:36 ,  Issue: 4 )