Thomas Fuhrmann Fast Wavelength Calibration Algorithm for Optical Spectrum Analyzers
71 - 76
2010
4
1
International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering http://waset.org/publications/11327
http://waset.org/publications/37
World Academy of Science, Engineering and Technology
In this paper an algorithm for fast wavelength calibration of Optical Spectrum Analyzers (OSAs) using low power reference gas spectra is proposed. In existing OSAs a reference spectrum with low noise for precise detection of the reference extreme values is needed. To generate this spectrum costly hardware with high optical power is necessary. With this new wavelength calibration algorithm it is possible to use a noisy reference spectrum and therefore hardware costs can be cut. With this algorithm the reference spectrum is filtered and the key information is extracted by segmenting and finding the local minima and maxima. Afterwards slope and offset of a linear correction function for best matching the measured and theoretical spectra are found by correlating the measured with the stored minima. With this algorithm a reliable wavelength referencing of an OSA can be implemented on a microcontroller with a calculation time of less than one second.
International Science Index 37, 2010