Experimental-based subsystem models for simulation of heterogeneous optical networks

Eduardo Magalhães,Miquel Garrich,Aldário Bordonalli,Uiara Moura,Juliano Oliveira,Lara Nascimento

doi:10.1590/s2179-10742014000200008

Abstract

This work presents and analyzes experimental-based subsystem models for Erbium doped fiber amplifiers (EDFAs) and wavelength selective switches (WSSs) under operation in a metropolitan optical network testbed. Firstly, the performance of the EDFAs and two gain control types are analyzed in a heterogeneous experimental setup with lightpaths modulated at 10G/100G/200G. Secondly, the WSS optical shape filter is experimentally characterized. Subsequently, simulation models are proposed accordingly to the experimental data obtained from the experimental setups. Results of output power and spectrum shape for both amplifiers under test showed good agreement between simulation and experiment. In addition, the optical signal-to-noise ratio (OSNR) for all channels was also analyzed and it was obtained error values bellow 1 dB, which are within an acceptable error margin. The developed sub-system models will provide greater flexibility to simulate different network scenarios and enable the development and validation of future optical network intelligence algorithms.

Highlights

The progress in the last years on Information and Communications Technologies (ICTs) has shaped society’s way of living in lots of aspects
Quadrature phase-shift keying (QPSK), 16-ary quadrature amplitude modulation (16-QAM), or optical orthogonal frequency-division multiplexing (OFDM), are common ways to improve the usage of the available spectrum resources [2]–[4]
In [12] we introduced a global reconfigurable optical add/drop multiplexer (ROADM)-based spectrum equalizer algorithm running over DWDM networks on software defined network (SDN)

Summary

INTRODUCTION

The progress in the last years on Information and Communications Technologies (ICTs) has shaped society’s way of living in lots of aspects. This occurs due the network lack of awareness, self-knowledge, and proper aim targets with which would be suitable to apply actions that minimize failure restoration times, guarantee low blocking ratios, increase resources efficiency, and achieve enhanced network performance In this challenging context, several works in the literature are proposing architectures, strategies, techniques and sub-systems that operate in an autonomic and/or cognitive way. We present experimental-based models to simulate optical links, providing adaptive set point control of EDFAs and WSS models which enable the development and validation of future optical network intelligence algorithms. We test and validate with random initial conditions for transmitted WDM signals and several modulation formats As a result, this model was able to establish near optimum operating points for the EDFAs that could guarantee high performance connection (OSNR error within ±1 dB in relation to experimental results) between particular network nodes, even if the initial conditions are abruptly changed. The network control parameters include WSS switching, EDFA gain set-point, variable optical attenuators (VOA) and 100G transmitter control

28 Gbaud PRBS 231-1

C58 NRZ-OOK

ROADM model

TEST CASES

RESULTS AND DISCUSSION

CONCLUSION