The present invention relating to a device and method for multiplication of repetition
frequency in optical pulse trains. The device and the method multiply repetition
frequency of optical pulse train generated with ML-FRL with high stability. The
device comprises an optical fiber ring composed of optical fibers, an optical amplifier
and a modulator for optically modulating, and an electric signal generator generating
high frequency signals. The device generates an optical pulse train of repeating
frequency of fm, when applying electric signals of frequency of fm
to the modulator. In addition to the construction, the stabilized optical pulse
generator comprises a filter passing through frequencies of integer multiple of
the applied modulation frequency fm, and a composite cavity composed
of a plurality of optical fibers of which lengths are different each other. As
frequency fc1 of the ring fiber of the long cavity of the composite
cavity and a resonant frequency fc2 of the ring fiber of the short cavity
of the composite cavity, a lowest common multiple frequency fcomposite
of fc1 and fc2, which is integer multiple of Kfm,
the stabilised optical pulse generator makes the repetition frequencies of the
generated optical pulses of PKfm (K, P: integer).
