Abstract
High-repetition-rate, Er-doped, fiber-ring lasers that are actively mode-locked at higher harmonics of the ring frequency, have been previously employed for ultrahigh bit-rate, time-division multiplexed soliton transmission.1−3 Fiber lasers built with polarization-maintaining (PM) Er-doped fibers are more stable than those using non-PM fibers. However, due to the limited power of available 980-nm or 1480-nm pump lasers, the pulse repetition frequencies (PRF) are lower and the pulsewidths are longer. These limitations are overcome by using a non-PM, Er/Yb co-doped fiber in a single-polarization, sigma fiber laser.4 However, high pump power is required due to the additional optical components.
© 1996 Optical Society of America
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