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Updated: Jun 13, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
In-band OSNR monitoring using a pair of Michelson fiber interferometers
1Semiconductor Photonics Group, School of Physics, Trinity College, Dublin 2, Ireland. floodea@tcd.ie
Abstract:
Two polarization-independent Michelson fiber interferometers with different optical delays were used to measure the in-band OSNR of an optical signal from 5 to 30 dB within an accuracy of 0.5 dB. Using an expansion of the amplitude autocorrelation function of the signal around zero delay, it was possible to perform measurements without any prior knowledge of the signal. The system is shown to be immune to the effects of modulation frequency (up to 10G), partially and fully polarized noise, chromatic dispersion and poorly biased modulators.
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