A novel repeaterless CPFSK coherent lightwave system employing an optical booster amplifier

Author

Sugie, Toshihiko ; Ohkawa, Norio ; Ito, Takeshi ; Imai, Takamasa

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

9

Issue

9

fYear

1991

fDate

9/1/1991 12:00:00 AM

Firstpage

1178

Lastpage

1186

Abstract

A novel system configuration for repeaterless transmission in conjunction with optical booster amplifiers is proposed. A nonlinear propagation section is introduced in the transmission fiber for the suppression of stimulated Brillouin scattering (SBS) and Raman amplification. The basic characteristics of the nonlinear propagation section were clarified experimentally. It was confirmed that the modulation index of the continuous-phase frequency shift keying (CPFSK) scheme can be selected without SBS restriction. A transmission experiment was conducted using a 364.3-km nondispersion shifted fiber and an erbium-doped fiber amplifier with an output of about +20 dBm to test the system configuration. The CPFSK modulation conditions for the design of repeaterless long-span systems are discussed from the viewpoints of the maximum input power as restricted by SBS laser diode linewidth, and chromatic dispersion in the transmission fiber

Keywords

fibre lasers; frequency shift keying; optical communication equipment; optical links; 364.3 km; Er doped fibre amplifier; Raman amplification; chromatic dispersion; continuous-phase frequency shift keying; laser diode linewidth; long-span systems; maximum input power; modulation index; nondispersion shifted fiber; nonlinear propagation section; optical booster amplifier; repeaterless CPFSK coherent lightwave system; stimulated Brillouin scattering; transmission fiber; Brillouin scattering; Fiber nonlinear optics; Nonlinear optics; Optical fiber testing; Optical modulation; Optical propagation; Optical scattering; Repeaters; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.85815

Filename

85815