Abstract
Fiber lasers can generate an optical pulse train that can be used as a source in optical communication systems. However, the repetition rate of fiber laser is low due to the long length of the cavity of a fiber laser. Recently, many research groups have been reported the possibility to use the fiber laser as the source of more high bit rate communication system.1,2 These use an actively harmonic mode-locking1 or a hybrid method, which is consisted of actively mode-locking and passively mode-locking2 in order to stabilize the pulse train and equalize the amplitude of each pulse. However, sometimes in a passively mode-locked fiber laser harmonic mode-locked pulse trains were reported as a form of partial harmonic mode-locking, which has a bunch of multiple pulses in a cavity.3 The understanding of mechanism of multi-pulse formation is very important to generate the harmonic mode-locking or in order to understand the dynamics of passive mode-locking. These multi-pulses can build up a perfect harmonic mode-locked pulse train by changing cavity parameters. The passively mode-locked fiber laser has more advantages for the generation of ultra short pulses.
© 2002 Optical Society of America
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