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Opt Lett. 2009 Sep 15;34(18):2873-5. doi: 10.1364/OL.34.002873.

Fiber-assisted single-photon spectrograph.

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Max-Planck Institute for the Science of Light, Junior Research Group IQO, Erlangen, Germany.


We demonstrate the implementation of a fiber-integrated spectrograph utilizing chromatic group velocity dispersion (GVD) in a single-mode fiber. By means of GVD we stretch an ultrafast pulse in time in order to spectrally resolve single photons in the time domain, detected by single-photon counting modules with very accurate temporal resolution. As a result, the spectrum of a very weak pulse is recovered from a precise time measurement with high signal-to-noise ratio. We demonstrate the potential of our technique by applying our scheme to analyzing the joint spectral intensity distribution of a parametric downconversion source at a telecommunication wavelength.

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