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We present an all fiber source of frequency entangled photon pairs by usingfour wave mixing in a Sagnac fiber loop. Special care is taken to suppress theimpurity of the frequency entanglement by cooling the fiber and by matching thepolarization modes of the photon pairs counter-propagating in the fiber loop.Coincidence detection of signal and idler photons, which are created in pairand in different spatial modes of the fiber loop, shows the quantuminterference in the form of spatial beating, while the single counts of theindividual signal (idler) photons keep constant. When the production rate ofphoton pairs is about 0.013 pairs/pulse, the envelope of the quantuminterference reveals a visibility of $(95\pm 2)%$, which is close to thecalculated theoretical limit 97.4%

An all fiber source of frequency entangled photon pairs