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Correlated signal and idler photon pairs with small detuning in the telecomband can be generated through spontaneous four-wave mixing in dispersion shiftfibers. However, photons originated from other nonlinear processes in opticalfibers, such as Raman scattering and self-phase modulation, may contaminate thephoton pairs. It has been proved that photons produced by Raman scattering arethe background noise of photon pairs. Here we show that photons induced byself-phase modulation of pump pulses are another origin of background noise.After studying the dependence of self-phase modulation induced photons insignal and idler bands, we demonstrate that the quantum correlation of photonpairs can be degraded by the self-phase modulation effect. The investigationsare useful for characterizing and optimizing an all fiber source of photonpairs.

Generation of Photon Pairs in Dispersion Shift Fibers through Spontaneous Four Wave Mixing: Influence of Self-phase Modulation