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Outage Probability Due to Intercore Crosstalk in Dual-Core Fiber Links With Direct-Detection

Rebola, J. ; Cartaxo, A. ; Alves , T. M. F. ; Marques, A. S. M.

IEEE Photonics Technology Letters Vol. 31, Nº 14, pp. 1195 - 1198, July, 2019.

ISSN (print): 1041-1135
ISSN (online): 1041-1135

Journal Impact Factor: 2,110 (in 2014)

Digital Object Identifier: 10.1109/LPT.2019.2921934

Abstract
The outage probability (OP) in short-haul direct-detection (DD) optical links supported by weakly-coupled multicore fiber (MCF) impaired by intercore crosstalk (ICXT) and using on-off keying signaling is assessed theoretically and through simulation. A closed-form expression for the OP is proposed for a single interfering core. This expression is useful to provide fast and reliable performance estimates in preliminary studies of weakly-coupled MCF-based systems where the ICXT is highly correlated along the signal bandwidth, i. e., when the skew-bit rate product is small. Particularly, results for a 20 km-long link at 10 Gbit/s and walk-off below 1 ps/km are detailed. For high skew-bit rate products, i. e., when the ICXT is decorrelated along the signal bandwidth, simulation results show that, for a typical OP of 104, the tolerance to ICXT increases above 4 dB, when compared with low skew-bit rate products. It is also shown that DD links with finite extinction ratio are more robust to outage induced by the ICXT than those with ideal extinction ratio.