Abstract
We perform a comprehensive study on the implementation of active harmonic
and rational harmonic mode-locking of a fiber optical parametric oscillator
(FOPO). In particular, the effect of pump parameters and cavity designs on
the characteristics of the generated pulses are analyzed. Two methods of frequency
μltiplication in FOPOs are discussed and compared and we show that we can
generate optical pulses with very high-repetition-rate (up to 240 GHz) using
rational harmonic mode-locking. We find that optical pulses with short duration
can be obtained using pump pulses with small duty cycle, large pump power,
and an intra-cavity optical filter with proper bandwidth. In addition, optical
pulses with low root-mean-square timing jitter are achievable when no pump
phase modulation is applied and hybrid gain of erbium-doped fiber amplifier
and parametric amplifier is used. High supermode noise suppression ratio is
achieved by taking advantage of the fast parametric gain and the combined
effect of self-phase modulation and spectral filtering. We conclude that synchronous-pumping
of an actively mode-locked FOPO offers many advantages in terms of reducing
the cavity loss, increasing the modulation frequency, enabling rational harmonic
mode-locking, and applications to all-optical clock recovery.
© 2013 IEEE
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