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Transparency limitations in optical core networks

: Strebel, B.; Caspar, C.; Foisel, H.-M.

Faulkner, D.W.:
Broadband superhighway : Proceedings of the European Conference on Networks & Optical Communications, NOC '96
Amsterdam: IOS Press, 1996 (Network and optical communications 1)
ISBN: 90-5199-275-0
ISBN: 90-5199-274-2
ISBN: 4-274-90103-3
ISBN: 3-905084-45-7
European Conference on Networks and Optical Communications (NOC) <1996, Heidelberg>
Fraunhofer HHI ()
amplitude shift keying; data communication; fibre lasers; frequency division multiplexing; frequency shift keying; light reflection; optical crosstalk; optical fibre dispersion; optical fibre networks; optical noise; photonic switching systems; photonic core network; optical fibre amplifiers; multichannel ofdm; optical transparent cross-connects; data channels; optical transparency length; dispersion; nonlinear effects; noise; reflections; crosstalk; cmi fsk heterodyne systems; ask direct detection loop; 140 mbit/s; 10 Gbit/s

Future telecommunication systems include a photonic core network, which utilizes the optical fibre path within the bandwidth of the optical fibre amplifiers by high bit rate multichannel OFDM techniques. In the nodes, optical transparent cross-connects switch the single data channels in the space and frequency domain. A significant parameter of each optical network is the optical transparency length, which can be illustrated in a transparency range diagram. Dispersion, nonlinear effects, noise, reflections and crosstalk limit the transparency length. Measurements of the transparency limits of 140 Mbit/s CMI FSK heterodyne systems are reported. Further a 10 Gbit/s ASK direct detection loop has been set up for characterizing transparent optical networks.