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A remote supervisory system based on subcarrier overmodulation for submarine optical amplifier systems

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3 Author(s)
Murakami, M. ; NTT Opt. Network Syst., Kanagawa, Japan ; Imai, T. ; Aoyama, M.

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

Published in:

Lightwave Technology, Journal of  (Volume:14 ,  Issue: 5 )

Date of Publication:

May 1996

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