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We demonstrate a wavelength-tunable, fiber-coupled source ofpolarization-entangled photons with extremely high spectral brightness andquality of entanglement. Using a 25 mm PPKTP crystal inside a polarizationSagnac interferometer we detect a spectral brightness of 273000 pairs/(s mWnm), a factor of 28 better than comparable previous sources while statetomography showed the two-photon state to have a tangle of T=0.987. Thisimprovement was achieved by use of a long crystal, careful selection offocusing parameters and single-mode fiber coupling. We demonstrate that, due tothe particular geometry of the setup, the signal and idler wavelengths can betuned over a wide range without loss of entanglement.

A wavelength-tunable fiber-coupled source of narrowband entangled photons