On the Mitigation of Optical Filtering Penalties Originating From ROADM Cascade

Author

Rahman, Tanvir ; Napoli, Antonio ; Rafique, Danish ; Spinnler, Bernhard ; Kuschnerov, M. ; Lobato, Iveth ; Clouet, Benoit ; Bohn, Marc ; Okonkwo, Chigo ; de Waardt, H.

Author_Institution

Dept. of Electr. Eng., Eindhoven Univ. of Technol., Eindhoven, Netherlands

Volume

26

Issue

2

fYear

2014

fDate

Jan.15, 2014

Firstpage

154

Lastpage

157

Abstract

Wavelength selective switches (WSSs) that are integrated in reconfigurable optical add-drop multiplexers (ROADMs) induce penalties on the optical signal due to tight optical filtering, which increases as several ROADMs are cascaded in a meshed network. In this letter, we propose and analyze possible configurations for the mitigation of these penalties in optical domain using optical wave shaper (WS). Including one WS in every ROADM node allows transmission of 28 and 32 GBd signals, which are QPSK, 8-QAM, or 16-QAM modulated, through a cascade of 32 and 14 WSS filters, respectively. With an average bandwidth of 33 GHz per WSS, an optical signal to noise ratio penalty below 1 dB at BER=1×10^-3 is observed.

Keywords

equalisers; multiplexing equipment; optical communication equipment; optical filters; quadrature amplitude modulation; quadrature phase shift keying; 16-QAM; 8-QAM; QPSK; ROADM cascade; bandwidth 33 GHz; optical filtering penalty; optical signal to noise ratio penalty; optical wave shaper; reconfigurable optical add-drop multiplexer; tight optical filtering; wavelength selective switch; Bandwidth; Optical fiber networks; Optical filters; Optical noise; Optical pulse shaping; Optical switches; Signal to noise ratio; Optical communication; optical equalizers; optical filters; optical pulse shaping;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2290745

Filename

6662421