Method for measuring the individual crosstalk in wavelength-division multiplex systems and wavelength division multiplex system
AssigneeSiemens Aktiengesellschaft
InventorsOliver Bleck, Andres Fricke, Rainer Wiesmann
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Abstract
The invention is directed to a wavelength-division multiplex system and to a method for measuring the individual crosstalk of a specific, of a plurality or of all channels onto a payload channel in wavelength-division multiplex systems. The invention is characterized in that n identification frequencies f(n) (5) with a modulation factor m(n) are modulated onto a payload signal and the current crosstalk is calculated.
Claims32
A method for measuring individual crosstalk of at least one of a plurality of channels on a payload channel in wavelength-division multiplex (WDM) systems, the method comprising the steps of:
- modulating, at an input-side, an identification frequency f(n) onto at least one first WDM channel in addition to a payload signal;
- supplying an input-side multiplexer with n WDM channels which have respectively different n channel frequencies;
- combining the n WDM channels via the input-side multiplexer, with the at least one first WDM channel having also had the identification frequency f(n) modulated thereon;
- dividing, via an output-side demultiplexer which is connected to the input side multiplexer via a transmission link, an incoming signal into the n WDM channels with the n channel frequencies;
- and
- detecting, by a phase synchronous detector which corresponds to the first identification frequency f(n), in at least one second WDM channel, a crosstalking signal from the at least one first WDM channel.
A wavelength-division multiplex (WDM) system, comprising:
- n WDM channels;
- parts for modulating, on an input side, an identification frequency f(n) onto at least one first WDM channel in addition to a payload signal;
- an input-side multiplexer for combining the n WDM channels supplied to it, with each of the n WDM channels having respectively different n channel frequencies, and with the at least one first WDM channel having also had the identification frequency f(n) modulated thereon;
- a transmission link connected to the input-side multiplexer;
- an output-side demultiplexer connected to the transmission link that respectively divides an incoming optical signal on a fiber onto the n WDM channels;
- and
- a phase synchronous detector which corresponds to the first identification frequency f(n) at an output side in at least one second WDM channel, for detecting a crosstalking signal from the at least one first WDM channel.
Dependencies are inferred from the claim text.