Measurement of wavelength division multiplexed networks

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Dr. Gerhátné Udvary Eszter
Department of Broadband Infocommunications and Electromagnetic Theory

My thesis is about the Coarse Wavelength Division Multiplexing (CWDM) technology, it’s qualifier tests and the measuring process. This topic is very actual because this technology is spreading nowadays. The CWDM technology mostly used in metro-networks, where is not necessery to use a DWDM technology with it’s huge bandwidth. In this case, we get a cheaper solution, because of the usage of the system components with lower requirements.

The first part of my thesis is the review of the bibliographies. My project was to research about the optical transfer systems, the CWDM technology, the different kinds of dispersions and the optical fiber’s non-linearity. The biuld-up of a CWDM system and it’s passive and active components are also reviewed.

In the second part the measuring process , the optical and digital instruments are presented what tools were used for the measurements. Then it is delineated what kind of qualification measurements needs to be done and how. These are selected in the following way: optical transmitter test (optical output power, output signal, spectral parameters), optical reciever test (reciever sensitivity, maximal input power, chromatic dispersion sensitivity), long time test, jitter test (output jitter, input jitter tolerance).

At the last part the measurements are presented and evaluated. F inally the results are compared with the requirements.


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