We demonstrate an efficient fiber-coupled source of nondegenerate polarization-entangled photons at 795 and 16090.3em0exnm using bidirectionally pumped parametric down-conversion in bulk periodically poled lithium niobate. The single-mode source has an inferred bandwidth of 500.3em0exGHz and a spectral brightness of 3000.3em0expairs∕(s0.2em0exGHz0.2em0exmW) of pump power that is suitable for narrowband applications such as entanglement transfer from photonic to atomic qubits.
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König et al. (2005) studied this question.