Long-haul (3465 km) transmission of a 10 GBd QPSK signal with low noise phase-sensitive in-line amplification

Abstract

We report the first use of low noise in-line phase-sensitive amplifiers in a long-haul circulating loop experiment. A reach extension of 200% compared to using EDFAs is observed with a 10 GBd QPSK signal.

Twin-Wave-Based Optical Transmission With Enhanced Linear and Nonlinear Performances

“…The transmission distance increase comes from both the low noise figure of the PSA and the nonlinearity mitigation which allows for a larger accumulated nonlinear phase shift. This work represents the first demonstration of an in-line fiber-based PSA in a multi-span long-haul transmission, the first demonstration of span-wise nonlinearity mitigation, and the first demonstration of increased reach in both linear and nonlinear transmission regimes by using a low-noise PSA in multi-span transmission [15].…”

“…Indeed, the use of PSAs to mitigate both linear and nonlinear noises has been recently demonstrated by Olsson et al [15]. A fiber-based PSA with large net gain was implemented to operate as an inline amplifier in a loop transmission experiment.…”

PDM Signal Amplification Using PPLN-Based Polarization-Independent Phase-Sensitive Amplifier

“…To enhance the SNR of optical fiber communication systems, phase sensitive amplifiers (PSA) are now attracting a great deal of interest because of their potential for low noise amplification [2] and their signal regeneration capability [3]. Recent advances on χ (2) and χ (3) -based nonlinear optical devices have confirmed the applicability of the PSA to long-haul transmission by performing recirculating loop transmission experiments [4], [5].…”

Phase-Sensitive Amplification of 28 GBaud DP-QPSK Signal

“…In contrast with PSAs, phase-insensitive amplifiers (PIAs) such as erbium-doped fiber amplifiers (EDFAs) or Raman amplifiers have a 3 dB quantum-limited NF. Using the copier-PSA configuration [2], low-noise PSAs have been demonstrated experimentally in order to achieve high-sensitivity receivers [1] and increase transmission distance [3]. However, these demonstrations have been performed with scalar PSAs where all-waves are co-polarized and thus polarization-diversity would be required in order to amplify dual-polarization (DP)-modulated signals.…”