Abstract
Ultralong bulk semiconductor optical amplifiers (bulk UL-SOAs) have
tremendous four-wave mixing (FWM) efficiencies so that due to two continuous
wave (CW) input signals, a broad mode comb at the output of the UL-SOA can
be obtained. When using tunable single mode lasers as input signals, the
generated FWM mode comb is tunable in the mode spacing and the wavelength.
As a result in time domain, widely tunable pulses in the repetition rate and
the carrier frequency are obtained. Since the phase signature of the FWM
modes is not linear over the whole mode comb, different filtering techniques
can be applied for filtering modes with linear phase in order to efficiently
generate short pulses. With the optimal filtering technique, pulses with
full width at half maximum of less than 2 ps and a pulse repetition rate of
20 GHz can be obtained.
© 2010 IEEE
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