A power equalization using an asymmetric nonlinear amplifying Sagnac interferometer (NASI) for ASK
modulation is studied numerically. A nonreciprocal phase bias was proposed to be introduced into the structure. The
nonreciprocal phase bias reduces not only the demanding for amplifier power or fiber non-linearity, but also increase
the dynamic input power range. The power equalization is demonstrated for RZ modulation by nonlinear phase analysis
and eye diagram simulation.
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