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We report the realization of a device based on a single Nitrogen-vacancy (NV)center in diamond coupled to a fiber-cavity for use as single photon source(SPS). The device consists of two concave mirrors each directly fabricated onthe facets of two optical fibers and a preselected nanodiamond containing asingle NV center deposited onto one of these mirrors. Both, cavity in- andoutput are directly fiber-coupled and the emission wavelength is easily tunableby variation of the separation of the two mirrors with a piezo-electriccrystal. By coupling to the cavity we achieve an increase of the spectralphoton rate density by two orders of magnitude compared to free-space emissionof the NV center. With this work we establish a simple all-fiber based SPS withpromising prospects for the integration into photonic quantum networks.

Narrow-band single photon emission at room temperature based on a single Nitrogen-vacancy center coupled to an all-fiber-cavity