1THz-Bandwidth Polarization-Diverse Optical Phase Conjugation of 10×114Gb/s DP-QPSK WDM Signals

Abstract

Polarization diverse optical phase conjugation of a 1THz spectral-band 1.14Tb/s DP-QPSK WDM multiplex is demonstrated for the first time, showing a worst case Q 2 penalty of 0.9dB over all conjugate wavelengths, polarizations and OSNR.

Transmission comparison of ultra-long Raman fibre laser based amplification with first and dual order Raman amplification using 10×118 Gbit/s DP-QPSK

“…The resulting signal with output power of +6 dBm was combined with a 100 kHz linewidth local oscillator (LO) in a polarisation diverse 90 degree optical hybrid [15]. Polarisation multiplexed I (in-phase) and Q (quadrature) signals were recovered using four high speed photodiodes and captured with a real-time oscilloscope with 80 GSample/s sampling rate and 36 GHz bandwidth.…”

Lumped Compensation of Nonlinearities based on Optical Phase Conjugation

“…OPC is based on degenerate four-wave-mixing (FWM) in a strained highly nonlinear fiber (HNLF) using bidirectional loop configuration to ensure polarization insensitivity, as in [24], [26], [32], [42]- [44], and it is accompanied by a wavelength shift from 1540 nm to 1550 nm. The conversion efficiency in the HNLF is approx -6 dB, sufficient to yield a low back-to-back conversion penalty below 0.5 dB in SNR, which becomes negligible in transmission [45]- [47].…”

Symmetry Enhancement Through Advanced Dispersion Mapping in OPC-Aided Transmission

“…The OPC implementation is sketched in Fig. 11, and it relies on degenerate four-wave-mixing (FWM) in a strained highly nonlinear fiber (HNLF) using a bidirectional loop configuration for polarization insensitive operation [42]- [44]. At the OPC input, the signal at 1540 nm is combined with a high-power pump around 1545 nm before entering the HNLF (α = 0.82 dB/km, γ = 9.7 /W/km, L = 254 m, S = 0.07 ps/nm 2 /km, and zero-dispersion wavelength at 1544 nm), where the conjugate wave (idler) is generated around 1550 nm.…”