Transparent ultra-long-haul DWDM networks with "broadcast-and-select" OADM/OXC architecture

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We describe an experimental realization of ultra-long-haul (ULH) networks with dynamically reconfigurable transparent optical add-drop multiplexers (OADMs) and optical cross-connects (OXCs). A simple new approach to dispersion management in ULH dense-wavelength-division-multiplexing (DWDM) transparent optical networks is proposed and implemented, which enables excellent transmission performance while avoiding dispersion compensation on a connection-by-connection basis. We demonstrate "broadcast-and-select" node architectures that take full advantage of this method. Our implementation of signal leveling ensures minimum variations of path-averaged power among the wavelength-division-multiplexing (WDM) channels between the dynamic gain-equalizing nodes and results in uniform nonlinear and spontaneous-emission penalties across the WDM spectrum. We achieve 80 x 10.7-Gb/s DWDM networking over 4160 km (52 spans x 80 km each) of all-Raman-amplified symmetric dispersion-managed fiber and 13 concatenated OADMs or 320 x 320 wavelength-port OXCs with 320-km node spacing. The WDM channels use 50-GHz grid in C band and the simple nonreturn-to-zero (NRZ) modulation format. The measured Q values exhibit more than a 1.8-dB margin over the forward-error correction threshold for 10(-15) bit-error-rate operation. We compare these results with point-to-point transmission of 80 x 10-Gb/s NRZ WDM signals over 4160 km without OADM/OXC and provide detailed characterization of penalties due to optical signal-to-noise-ratio degradation, filter concatenation, and crosstalk.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2003-11
Language
English
Article Type
Article
Keywords

DISPERSION-MANAGED FIBER; TRANSMISSION; SYSTEMS; EQUALIZATION; SPAN

Citation

JOURNAL OF LIGHTWAVE TECHNOLOGY, v.21, no.11, pp.2661 - 2672

ISSN
0733-8724
DOI
10.1109/JLT.2003.819557
URI
http://hdl.handle.net/10203/81593
Appears in Collection
EE-Journal Papers(저널논문)
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