Abstract

We experimentally demonstrate reduction of the polarization sensitivity of a nonlinear optical loop mirror (NOLM) from 5 to 0.5  dB by use of 550  m of twisted dispersion-shifted fiber with a twist rate of 8 turns/m (24  turns/beat length). The twisting of the fiber induces circular birefringence and equates the parallel- and the orthogonal-polarization nonlinear phase-shift terms. Experimental results show that the polarization sensitivity monotonically decreases from 5  dB for nontwisted fiber to 0.5  dB for fiber that is twisted at a rate of 8  turns/m, and the twist rate should be more than 4  turns/m (>10 turns/beat length) for emulation of circularly polarized fiber. The minimum polarization sensitivity occurs when the control-pulse polarization is aligned with one of the eigenmodes of the twisted fiber. With the fiber twisted at a rate of 8  turns/m in the NOLM, the nonlinear transmission is 23% at a switching energy of 4  pJ/pulse. Simulations confirm the observed behavior and show that the remaining polarization sensitivity results from energy transfer between orthogonal modes of the signal pulse.

© 1999 Optical Society of America

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