Title :
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
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;
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
