Abstract
Twentieth-order rational harmonic mode-locking (RHML) semiconductor
optical amplifier fiber laser (SOAFL) pulses are demonstrated by using 1-GHz
backward dark-optical comb injection. Maximum frequency detuning range of $\pm$ 300 Hz, broadened
pulsewidth of 35 ps, and highest average power of 0.4 $\mu$W for twentieth-order RHML-SOAFL pulse
are characterized. The extraordinary phenomena on the red-shifted wavelength
from 1535.5 to 1541.5 nm and the corresponding spectral linewidth reduced
from 12 to 3 nm are observed with the RHML order increasing to 8 or higher.
Such a less pronounced RHML mechanism at higher orders occurred in the optically
injection mode-locked SOAFL is mainly attributed to the weak mode-locking
strength at high RHML orders as compared to continuous-wave lasing mechanism.
© 2009 IEEE
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