We describe a new fiber laser configuration based on a nonlinear optical loop mirror with a symmetrical coupler, a quarter-wave retarder, and highly twisted, birefringent fiber in the loop. The nonlinear optical loop mirror configuration operates by nonlinear polarization rotation. We have achieved stable generation of subpicosecond pulses with milliwatts of average output power.
© 2001 Optical Society of America
E. A. Kuzin, B. Ibarra Escamilla, D. E. Garcia-Gomez, and J. W. Haus, "Fiber laser mode locked by a Sagnac interferometer with nonlinear polarization rotation," Opt. Lett. 26, 1559-1561 (2001)