Nokia Siemens Networks Gmbh & Co Kg

Technische Universitaet Dortmund

Xieon Networks S.a.r.l.

Technische Universitat Dortmund

Peter Krummrich

A method for transmitting optical information between an emitter station and a receiving station via a multi-mode optical wave guide uses a wave length multiplex method. Several optical emitters generate a respective signal for each wave length to be transmitted. The signals are fed to the multi-mode optical wave guide in the form of a number of modes via mode multiplexers and wavelength multiplexers, the multi-mode optical wave guide having its own mode that can propagate within the multi-mode optical wave guide for each mode to be transmitted. After transmission and optionally regeneration and/or amplification of the signal via the multi-mode optical wave guide, the transmitted signals are broken down via the wavelength multiplexer into groups of signals having the same wavelength and via the mode demultiplexer into signals having the same mode. Subsequently, the interference signals are extracted from the transmitted demultiplexed signals.

Method and device for transmission of optical data between transmitter station and receiver station via of a multi-mode light wave guide

An optical noise signal is added to an optical data signal on the receiver side, and a signal quality of the data signal is determined. The magnitude of the added noise signal is varied, and a function of the signal quality of the data signal is determined in dependence on the added noise signal. Subsequently, a first straight line is approximated to the previously determined function for smaller values of the added noise signal, and a second straight line for larger values of the added noise signal. The optical signal-to-noise ratio is read from the intersecting point of the first straight line with the second straight line. Thus, the ASE present is derived from the controlled addition of additional ASEs, and the optical signal-to-noise ratio is determined. The process is particularly suited for DWDM systems because it works even with very narrow channel separations, or with narrowband optical filtration along the separation.

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Dortmund, Germany

Peter Krummrich