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We present a novel measurement technique for precise longitudinal characterization of polarization parameters in optical fibers based on the modified counter-colliding scanner technique.
Raman-induced gain distortions in broadband (pump separations of 132 and 155 nm) double-pumped parametric amplifiers are theoretically and experimentally analyzed. A gain profile possessing 100 nm of 3 dB ripple and 140 nm of 4.7 dB ripple is demonstrated.
Numerical simulations indicate possibility of long-haul transmission with 1.0 bit/sec-Hz spectral efficiency per polarization, based on intensity modulated principles with low complexity equalization at the receiver.
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