Generation of correlated photons in microstructure fibers

The gains of Four-wave mixing and Raman scattering in an optical fiber vary with wavelength. We use this wavelength variation to experimentally optimize the four-wave mixing relative to the Raman scattering, resulting in high photon coincidence rates and high coincidence/accidental contrast ratios. We obtain a photon coincidence rate of 53.7 kHz/mW/nm with a coincidence/accidental contrast of 10:1 in a 1.8 m microstructure fiber. We discuss the use of this fiber as a source for photon-counting detector efficiency calibrations.

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