Siemens Aktiengesellschaft

Nokia Siemens Networks Gmbh & Co Kg

Christian Eder

Lutz Rapp

Peter Krummrich

Robert Schimpe

Richard Neuhauser

Guido Gentner

Alexander Richter

Ulrich Gaubatz

Wolfgang Peisl

Jörg Eberlein

The invention relates to a method for easily and rapidly preemphasizing an optical multiplex signal transmitted by an emitter to a receiver consisting wherein signal-to-noise ratios are equalized by means of simple measurement or new adjustment of signal power on the bandwidth of the optical multiplex signal, at least in the receiver, instead of measuring the noise output power or the signal-to-noise ratio. Said invention is based on a balance of the signal-to-noise ratios which are authorized by a transmitting system, in which the spectral influences of gain profiles, noise effects and dampings are taken into consideration. In particular, when DWDM transmission techniques are applied, in which adjacent channel spacings of the optical multiplex signal are very low, the inventive method makes it possible to use a small number of sensitive and high-resolution measuring instruments for pre-emphasis control.

Method for preemphasising an optical multiplex signal

According to the invention, in add-drop devices of an optical cross-connect device for wavelength multiplex signals, tributary drop signals to be dropped are pre-selected in the drop branch by means of pre-selection elements. Only these signals are amplified, thus reducing the number and/or power of the optical amplifiers. The tributary drop signals are individually selected by means of drop routing elements and adjustable filters. The add branch is created correspondingly.

Add-drop device and cross-connect device for wavelength multiplex signals

A method and apparatus for controlling the signal/noise ratio of optical add/drop signals in an optical WDM transmission system having a transmitter unit, a receiver unit and at least one optical add/drop multiplexer for transmitting optical express signals and at least one optical add/drop signal wherein the power spectrum of the pre-emphasized express signals is determined, and the signal level of the at least one optical add/drop signal is adapted to the power spectrum determined for the express signals.

Method for controlling the signal/noise ratio of optical add/drop signals

A method for producing non-equidistant pump waves for Raman amplification of a signal which is passed via an optical waveguide, as well as a pump wave producing apparatus for producing pump waves for Raman amplification of a signal which is passed via an optical waveguide, which apparatus has at least one pump source and is set up such that it can produce pump waves at a first, a second, a third and a fourth mutually equidistant pump wavelength, having a control device which is set up such that it causes, in each case, the production of a pump wave u, v, w at the first, second and fourth pump wavelengths, with the control device being set up such that no pump wave is produced at the third pump wavelength, so that a non-equidistant pump channel pattern is achieved overall.

Multiplexer for providing non-equidistant intervals between pump wavelengths in broadband raman amplifiers

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Munich, Germany

Christian Eder