Abstract
We experimentally demonstrate nonlinear noise compensation in an optical phase conjugation assisted 1st order Raman amplified 30x30Gbaud DP-QPSK transmission system with a spectral efficiency of 3.6b/s/Hz. We show that by optimizing the link symmetry, even with only 1st order Raman amplification a single, mid-link, optical phase conjugation compensates for 90% of the signal-signal nonlinear interference resulting in a 2.3dB performance enhancement. We show that increasing the number of optical phase conjugations in the presence of 10% residual nonlinearity results in a reduction in the performance enhancement owing to an enhancement in the nonlinear noise generation efficiency of the system. We achieve a record 72% optical phase conjugation enabled reach enhancement of the 30x30Gbaud DP-QPSK signals.
Highlights
Nonlinear Kerr effects of optical fibers are considered to be a major limiting factor to the performance of long-haul optical fiber transmission systems
We report an experimental demonstration of 72% reach enhancement achieved by dual-band mid-link Optical phase conjugation (OPC) using only 1st order Raman amplification with both broad bandwidth (30x30Gbaud wavelength division multiplexer (WDM) DP-QPSK at a spectral efficiency = 3.6b/s/Hz) and moderate (50km) amplifier spacing
Without OPC, the electronically dispersion compensated (EDC) system reaches its minimum EVM2 (−11.6dB) at per channel launch power of approximately −3dBm, while a single mid-link OPC improves in the optimum EVM2 by 2.2dB as confirmed by the constellation of the received 30GBaud DP-QPSK signal
Summary
Nonlinear Kerr effects of optical fibers are considered to be a major limiting factor to the performance of long-haul optical fiber transmission systems. We report an experimental demonstration of 72% reach enhancement achieved by dual-band mid-link OPC using only 1st order Raman amplification with both broad bandwidth (30x30Gbaud WDM DP-QPSK at a spectral efficiency = 3.6b/s/Hz) and moderate (50km) amplifier spacing. This represents the highest reported long-haul reach enhancement for an OPC based system. We show that whilst a mid-link OPC assisted system achieves 2.2dB performance enhancement for all channels simultaneously, two and three OPCs generate reduced performance enhancements of 1.6dB and 1.4dB, respectively
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