Group delay ripple reduction in cascaded ROADMs by adaptively modulated optical OFDM signals for Metro/Regional networks

Author

Giacoumidis, E. ; Tomkos, I. ; Tang, J.M.

Author_Institution

Networks & Opt. Commun. (NOC) Group, Athens Inf. Technol. (AIT), Athens, Greece

fYear

2011

Firstpage

88

Lastpage

91

Abstract

The Group Delay Ripple (GDR) is investigated thoroughly, for the first time, for optical OFDM (OOFDM) transceivers using adaptive modulation in intensity modulation and direct detection (IM-DD) transparent Metro/Regional network systems incorporating cascaded reconfigurable optical add/drop multiplexers (ROADMs). The considered ROADMs are based on two optical filters, fibre-Bragg grating (FBG) and a wavelength-blocker (WB)/wavelength selective switch (WSS) device. It is shown that adaptive modulation can enhance the network tolerance not only to the GDR, but also to the pass-band loss ripple (LR) and frequencies dip, leading also to an improved system performance of up to about 60% in comparison with conventional identical modulation.

Keywords

Bragg gratings; OFDM modulation; adaptive modulation; optical fibres; optical transceivers; adaptive modulation; cascaded ROADM; cascaded reconfigurable optical add/drop multiplexer; fibre-Bragg grating; group delay ripple reduction; identical modulation; intensity modulation; modulated optical OFDM signal; network tolerance; optical OFDM transceiver; optical filters; pass-band loss ripple; transparent metro/regional network system; wavelength blocker; wavelength selective switch device; Fiber gratings; Modulation; Optical fiber filters; Optical fiber networks; Optical fibers;

fLanguage

English

Publisher

ieee

Conference_Titel

Networks and Optical Communications (NOC), 2011 16th European Conference on

Print_ISBN

978-1-61284-753-5

Electronic_ISBN

978-1-86135-373-3

Type

conf

Filename

5996239