Abstract

Nowadays, optical network nodes are usually based on reconfigurable optical add/drop multiplexers (ROADMs). Due to exponential growth of internet data traffic, ROADMs have evolved to become more flexible, with multi-degree and their add/drop structures are now more complex with enhanced features, such as colorless, directionless and contentionless (CDC). In this work, the impact of in-band crosstalk, optical filtering and amplified spontaneous emission noise on the performance of an optical network based on multi-degree CDC ROADMs is studied considering 100-Gb/s polarisation division multiplexing quadrature phase-shift keying signals for the fixed grid. We show that, an optical signal can pass through a cascade of 19 CDC ROADMs, based on a route and select architecture with 16-degree, until an optical signal-to-noise ratio (OSNR) penalty of 1 dB due to in-band crosstalk is reached. We also show that the ASE noise addition, due to the increase of the number of CDC ROADMs, is more harmful in terms of OSNR penalty than in-band crosstalk.

Highlights

  • The exponential growth of internet data traffic due to the increase of the number of devices, cloud and video-on-demand services, has been putting fibre optic network technologies in a continuous development to support all the data generated

  • In this work, the performance of an optical network based on multi-degree CDC reconfigurable optical add/drop multiplexers (ROADMs) impaired by in-band crosstalk, amplified spontaneous emission (ASE) noise and optical filtering has been investigated considering a 100-Gb/s QPSK signal for the fixed grid

  • It is shown that the route and select (R&S) architecture is the most robust architecture in terms of the in-band crosstalk generated inside multi-degree CDC ROADMs

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Summary

INTRODUCTION

The exponential growth of internet data traffic due to the increase of the number of devices, cloud and video-on-demand services, has been putting fibre optic network technologies in a continuous development to support all the data generated Technologies, such as dense wavelength-division multiplexing, optical coherent detection, polarisation division multiplexing (PDM) and advanced digital signal processing (DSP) are fundamental to achieve the huge transport capacities required by the overall telecommunications infrastructure [1].

MODELLING THE IN-BAND CROSSTALK INSIDE A ROADM
ROADM Transponder
In-Band Crosstalk Generation inside a ROADM
PHYSICAL LAYER IMPAIRMENTS IMPACT
Optical Filters used to Model the ROADM Components
CONCLUSIONS

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