Impact of Raman Amplification on a 2-Tb/s Coherent WDM System

Author

Frascella, Paola ; Antony, Cleitus ; Fabbri, Simon J. ; Gunning, Fatima C Garcia ; Gunning, Paul ; McAuliffe, William ; Cassidy, Derek ; Ellis, A.D.

Author_Institution

Photonic Syst. Group, Tyndall Nat. Inst., Cork, Ireland

Volume

23

Issue

14

fYear

2011

fDate

7/15/2011 12:00:00 AM

Firstpage

959

Lastpage

961

Abstract

The impact of hybrid erbium-doped fiber amplifier (EDFA)/Raman amplification on a spectrally efficient coherent-wavelength-division-multiplexed (CoWDM) optical communication system is experimentally studied and modeled. Simulations suggested that 23-dB Raman gain over an unrepeatered span of 124 km single-mode fiber would allow a decrease of the mean input power of ~6 dB for a fixed bit-error rate (BER). Experimentally we demonstrated 1.2-dB Q-factor improvement for a 2-Tb/s seven-band CoWDM with backward Raman amplification. The system delivered an optical signal-to-noise ratio of 35 dB at the output of the receiver preamplifier providing a worst-case BER of 2 × 10 ^-6 over 49 subcarriers at 42.8 Gbaud, leaving a system margin (in terms of Q -factor) of ~4 dB from the forward-error correction threshold.

Keywords

Raman lasers; erbium; light coherence; optical communication equipment; optical fibre amplifiers; wavelength division multiplexing; EDFA; Raman amplification; Raman gain; bit rate 2 Tbit/s; coherent WDM system; coherent wavelength division multiplexed optical communication system; distance 124 km; gain 23 dB; hybrid erbium doped fiber amplifier; single mode fiber; Erbium-doped fiber amplifier; Gain; Optical fiber amplifiers; Optical noise; Q factor; Signal to noise ratio; Stimulated emission; Coherent wavelength-division multiplexing (CoWDM); Raman amplification;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2147299

Filename

5756219