We use a grating spectrometer with a time resolution of 17.4 μs and a spectral resolution of 5 GHz to analyze a superluminescent source operating near 1350 nm. Polychromatic beating noise is shown to dominate single-shot measurements of the source spectrum; the observed noise level is within 19% of the theoretical beating noise level. By adopting a delayed pulse referencing scheme used previously with wavelength-swept sources, the beating noise is virtually eliminated, allowing spectral measurements limited only by shot noise and camera read noise.
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Conrad, B.L., Sanders, S.T. Delayed pulse referencing for cancellation of polychromatic beating noise in grating spectrometry. Appl. Phys. B 96, 715–718 (2009). https://doi.org/10.1007/s00340-009-3628-3