Coded-subcarrier-aided chromatic dispersion monitoring scheme for flexible optical OFDM networks.

Kam-Hon Tse,Chun-Kit Chan

doi:10.1364/oe.22.018934

Abstract

A simple coded-subcarrier aided scheme is proposed to perform chromatic dispersion monitoring in flexible optical OFDM networks. A pair of coded label subcarriers is added to both edges of the optical OFDM signal spectrum at the edge transmitter node. Upon reception at any intermediate or the receiver node, chromatic dispersion estimation is performed, via simple direct detection, followed by electronic correlation procedures with the designated code sequences. The feasibility and the performance of the proposed scheme have been experimentally characterized. It provides a cost-effective monitoring solution for the optical OFDM signals across intermediate nodes in flexible OFDM networks.

Highlights

In future flexible optical networks, flexible transceivers and bandwidth flexible optical crossconnects will be equipped to provision data traffic on flexible grid, so as to achieve high bandwidth flexibility and high spectral efficiency [1]
There have been some interesting schemes proposed for optical performance monitoring of optical orthogonal frequency division multiplexing (OFDM) signals
We propose a chromatic dispersion (CD) monitoring scheme, using simple direct detection of the coded optical subcarriers, for coherent optical OFDM (CO-OFDM) systems at the intermediate nodes

Summary

Introduction

In future flexible optical networks, flexible transceivers and bandwidth flexible optical crossconnects will be equipped to provision data traffic on flexible grid, so as to achieve high bandwidth flexibility and high spectral efficiency [1]. To assure the quality of the service provisioning, optical performance monitoring (OPM) is an indispensable element in network management. There have been some interesting schemes proposed for optical performance monitoring of optical OFDM signals. In [7], we have recently proposed a novel scheme to monitor the accumulated chromatic dispersion of optical OFDM signals at the intermediate/receiving nodes by employing a pair of coded optical label subcarriers, without the need of expensive coherent receiver. We have performed further experimental demonstration and characterization to show the feasibility of the proposed CD monitoring scheme.

Chromatic dispersion monitoring of optical OFDM signals

Experimental demonstration and characterization

50 OFDM Label 40

Summary