Abstract
The Erbium-doped fiber amplifier (EDFA) exhibits a relatively low gain per unit length, forcing fundamental cavity frequencies of optical resonators to remain low (~10 MHz). Such dense longitudinal mode spacing requires modelocking at high cavity harmonics to achieve today’s desired bit rates. Harmonically modelocked oscillators suffer from supermode noise,1 which has been successfully suppressed in fiber lasers using various techniques.2–1 We report the most extensive supermode suppression (and lowest pulsetrain noise) achieved to date with a 10 GHz external-cavity semiconductor diode ring laser. Using a recently-developed wideband modification5 of an established homodyne noise measurement technique,6 we present high dynamic range measurements out to Nyquist offsets which show strong supermode suppression to levels below −140 dBc/Hz.
© 2002 Optical Society of America
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