A novel Figure of Merit to Compare Fibers in Coherent Detection Systems with Uncompensated Links

Abstract

We introduce an improved fiber figure of merit (FoM) in order to compare different fiber types used in uncompensated links for transmission of coherently-received modulation formats. The role of fiber dispersion in enhancing system performance is shown and verified by simulations and experiments, confirming the need for the inclusion of dispersion parameter in a FoM definition allowing to compare fiber types with relevant different dispersion parameters. Applicability of the proposed FoM has been demonstrated for channel spacing from the Nyquist limit up to 5/3 the symbol rate.

Impact of fiber parameters on EDFA and/or Raman amplified high-spectral-efficiency coherent WDM transmissions

“…Previously, a few figures of merit (FOM) [8][9][10][11] have been proposed to estimate the performance improvement over a reference system in terms of OSNR or Q 2 factor, link reach, or span loss margin, as a function of fiber and link parameters. Specifically, the OSNR and Q 2 -factor improvement predicted by the FOM in [8] matched the 112-Gb/s experiments employing polarization-division multiplexed quadrature phase-shift keying (PDM-QPSK) and lumped erbium-doped fiber amplifiers (EDFAs); the FOM for maximum reach in [9] was validated by PDM-QPSK experiments and PDM-16QAM simulations; in [11] the FOM for OSNR estimate was extended to include hybrid EDFA/Raman and all Raman amplification schemes.…”

Design Strategies and Merit of System Parameters for Uniform Uncompensated Links Supporting Nyquist-WDM Transmission

“…If an analytical model for the NLI evaluation was applied, such an operation would be more complex and, most important, the merit of each system parameter on the design target should not be so clear and quickly readable. So far, this problem had been addressed by looking at different fiber 'figures of merit' [22], [23] and only partially analyzed with the objective of obtaining clear and simple design rules [25]- [27].…”

Massive Terminal Dispersion Compensation Enabling Nondispersion-Managed Submarine Links With First Generation Coherent Transponders

“…However, the effective area of DCF is typically small causing concern that transmission performance may be penalized by nonlinear effects since nonlinear phase shift is inversely proportional to effective area [5]. In the regime of large accumulated dispersion, however, nonlinear impairments no longer scale linearly with nonlinear phase shift but significantly slower [2], [3], [6]. In this letter we numerically and experimentally investigate the limits of terminal based CDC using DCF in coherent systems with non-dispersion-managed links.…”