Physical Layer Impairments in Cascaded Multi-degree CDC ROADMs with NRZ and Nyquist Pulse Shaped Signals

Diogo G. Sequeira, Luís G. Cancela, João L. Rebola

2018

Abstract

Nowadays, reconfigurable optical add/drop multiplexers (ROADMs) are mainly based on broadcast and select (B&S) and route and select (R&S) architectures. Moreover, the most used components to implement the colorless, directionless and contentionless (CDC) ROADM add/drop structures are the multicast switches (MCSs) and the wavelength selective switches (WSSs). In-band crosstalk, amplified spontaneous emission (ASE) noise accumulation and optical filtering are physical layer impairments (PLIs) that become more enhanced in a CDC ROADM cascade. In this work, we investigate the impact of these PLIs in a cascade of CDC ROADMs based on both B&S and R&S architectures, with MCSs and WSSs-based add/drop structures and for nonreturn-to-zero (NRZ) rectangular and Nyquist pulse shaped signals. We show that the optical filtering impairment is more limiting for a R&S architecture. We also show that the ASE noise accumulation after 32 cascaded ROADMs leads to a 10 dB optical signal-to-noise ratio (OSNR) penalty for all ROADM degrees investigated. We have also concluded that the in-band crosstalk leads to a 1 dB OSNR penalty, after 13 and 24 cascaded 16-degree CDC ROADMs based on B&S for, respectively, NRZ rectangular and Nyquist pulse shapes. For a R&S architecture, the in-band crosstalk is not so harmful.

Paper Citation

in Harvard Style

L. Rebola J. (2018). Physical Layer Impairments in Cascaded Multi-degree CDC ROADMs with NRZ and Nyquist Pulse Shaped Signals.In - OPTICS, ISBN , pages 0-0. DOI: 10.5220/0006861102230231

in Bibtex Style

@conference{optics18,
author={João L. Rebola},
title={Physical Layer Impairments in Cascaded Multi-degree CDC ROADMs with NRZ and Nyquist Pulse Shaped Signals},
booktitle={ - OPTICS,},
year={2018},
pages={},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006861102230231},
isbn={},
}

in EndNote Style

TY - CONF

JO - - OPTICS,
TI - Physical Layer Impairments in Cascaded Multi-degree CDC ROADMs with NRZ and Nyquist Pulse Shaped Signals
SN -
AU - L. Rebola J.
PY - 2018
SP - 0
EP - 0
DO - 10.5220/0006861102230231