Reconfigurable Optical Add/Drop Multiplexer with 8.0 dB Net Gain Using Dual-Pass Amplified Scheme

Shien-Kuei LIAW  Ming-Hung CHANG  Chun-Jung WANG  Yi-Tseng LIN  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.8   pp.2016-2021
Publication Date: 2007/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.8.2016
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
optical add/drop multiplexer,  reconfigurable,  wavelength division multiplexing,  tunable fiber Bragg grating,  optical network,  optical communication,  

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We propose an N-channel power-compensated reconfigurable optical add/drop multiplexer (ROADM) based on using fiber Bragg gratings (FBGs). Both tunable FBGs and wavelength-fixed FBGs are used in this ROADM. By using the dual-pass amplification scheme with two pieces of erbium doped fibers, an 8.0 dB optical net gain has been achieved with a gain variation less than 0.5 dB for each add/drop/pass-through channel. System performance was studied for a four-WDM-channel 10 Gb/s100-km lightwave transmission trial network and bit error rate of 10-9 is observed for the 50 km added signal, 100 km pass-through signal and 50 km dropped signal at -18.3, -19.4 and -18.9 dBm received power, respectively. Only 1.1 dB of power penalty was observed compared to the back-to-back transmission.