Abstract
The properties of phase-sensitive amplification (PSA) in highly nonlinear
fibers are studied. We present a soft glass fiber designed for high nonlinearity
and broadband, low dispersion and simulate its performance as a PSA device
for ultrafast bitrate signals at 640 Gb/s. The effect of the fiber design
parameters on its PSA performance have been studied and the final design has
been optimized using a genetic algorithm to have a high nonlinearity and low,
flat dispersion. This design has subsequently been compared to other highly
nonlinear fibers in order to highlight the effect of both using soft glass
and the design and optimization technique. Modelled fiber performance shows
squeezing of phase noise in a 5 m length of fiber with 32 dBm total power
in the signal and pumps. The fiber length we have used in our model is two
orders of magnitude shorter than the state of the art silica based PSA devices
for comparable power levels. In addition, fabrication tolerance modelling
is done to show that our fiber design is better able to manage fluctuations
in the dispersion due to the high nonlinearity.
© 2012 IEEE
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