Abstract
Erbium-doped fiber ring lasers pumped far above threshold often maintain for seconds on end evenly spaced trains of pulses of roughly equal energies.1 The experimental setup we use to investigate this phenomenon is a simple soliton laser, similar to the setup shown in Ref. 2. Polarization additive-pulse mode locking (APM) is achieved with bulk wave plates. A quartz filter is used for tuning. The loop length is 11.9 m, corresponding to a fundamental repetition rate of 16.8 MHz, and the total net dispersion is −0.16 ps2. The erbium fiber (donated by AT&T) is 1.1 m long and has an estimated dispersion of +0.075 ps2. The rest of the laser is constructed of 10.3 m of Coming SMF-28 fiber and a 0.5-m segment of Corning Flexcor 1060 fiber comprising the wavelength-division-multiplexing coupler. The output pulse width is 0.64 ps, and the spectral width is 7.6 nm, giving a time-bandwidth product of 0.61.
© 1995 Optical Society of America
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