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Raman scattering can be exploited for amplification in optical fiber telecommunications or, chemical identification in spectroscopy, but represents a source of detrimental noise photons for quantum communications. The spectral distribution of spontaneous Raman scattering (SpRS) can be measured in bulk samples with the free-space 90° scattering method [1]. In long fibers the SpRS spectra can be measured...
We demonstrate a silicon nanowire based radio frequency spectrum analyser based on cross-phase modulation. We show that the device is accurate, with cross-chirp from photogenerated free-carriers negligible and measure RF spectra for 640Gbaud on-off-keyed data.
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