Title :
A remote supervisory system based on subcarrier overmodulation for submarine optical amplifier systems
Author :
Murakami, Makoto ; Imai, Takamasa ; Aoyama, Masaharu
Author_Institution :
NTT Opt. Network Syst., Kanagawa, Japan
fDate :
5/1/1996 12:00:00 AM
Abstract :
A supervisory (SV) signal transmission scheme for long haul optical amplifier systems is described. The scheme is based on subcarrier overmodulation of the line signal and features simple configuration; due to the use of EDFA gain modulation, no additive optical components are required in a submarine repeater to transmit a response signal. This paper discusses the subcarrier modulation index and frequency used for the SV signaling, the most significant design parameters. The dependence of the signal-to-noise ratio (SNR) on the modulation index in SV signal transmission is analyzed to clarify the modulation index value required for reliable SV signaling. In addition, the line signal impairment caused by subcarrier overmodulation is also analyzed to show the system´s in-service feasibility. The subcarrier frequencies used for command and response signal transmission are discussed from the experimental results on the frequency response of an optical amplifier system and EDFA gain modulation efficiency
Keywords :
erbium; fibre lasers; frequency response; optical fibre communication; optical modulation; optical noise; submarine cables; EDFA gain modulation; SV signal transmission; SV signaling; additive optical components; design parameters; frequency response; in-service feasibility; line signal; line signal impairment; long haul optical amplifier systems; modulation index; optical amplifier system; reliable SV signaling; remote supervisory system; response signal transmission; signal-to-noise ratio; subcarrier frequencies; subcarrier modulation index; subcarrier overmodulation; submarine optical amplifier systems; submarine repeater; supervisory signal transmission scheme; Erbium-doped fiber amplifier; Frequency; Optical amplifiers; Optical devices; Optical modulation; Repeaters; Semiconductor optical amplifiers; Signal analysis; Stimulated emission; Underwater vehicles;
Journal_Title :
Lightwave Technology, Journal of
