Abstract
We demonstrate an active fiber polarization-rotation switch based on modulation instability operating near 1.5 microm that exhibits contrast ratios of up to 40:1 and small-signal gains of up to 40 dB. Modulation instability generates upper and lower sideband frequencies with different states of polarization from the pump at the fiber output. The high contrast ratio is achieved in part because intensity fluctuations with the pump alone do not lead to an output from the device.
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