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Theoretical analysis and experimental investigations are presented on the resolution of a ratiometric wavelength measurement system. Theoretical modeling indicates that the resolution of a ratiometric wavelength measurement system is determined by the signal-to-noise ratio of the input signal and the noise of the photodetectors associated with optical-to-electronic conversion. For experimental verification, a ratiometric system employing a macrobending standard single-mode fiber is developed and corresponding results are in good agreement with the theoretical prediction.
Wang, G., Rajan, G., Wang, P., Farrell, G.:Resolution Investigation of a Ratiometric Wavelength Measurement System. Applied Optics, Vol 46, (25), 2007, pp.6362-6367. doi:10.1364/AO.46.006362