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We theoretically demonstrate a fiber-integrated single photon source ofunprecedented efficiency. This fiber single photon source is achieved bycoupling optically a single quantum emitter to a monomode optical fiber with anew concept of ultra-broadband optical antenna. Such an optical antenna conceptis the result of the transposition to optical frequencies of the well-knownlow-frequency horn antenna The optical horn antenna is here shown to be capableof directing the radiation from the emitter toward the optical fiber andefficiently phase-matching the photon emission with the fiber mode. Numericalresults show that an optical horn antenna can funnel up to 85% of the radiationfrom a dipolar source within an emission cone semi-angle as small as 7 degrees(antenna directivity of 300). It is also shown that 50% of the emitted powerfrom the dipolar source can be collected and coupled to an SMF-28 fiber modeover spectral ranges larger than 1000 nm, with a maximum energy transferreaching 70 %. This approach is highly promising in the engineering ofall-fiber "on-demand" single photon sources for telecommunication, quantumoptics and sensing.

Fiber-integrated single photon source of high efficiency based on a concept of ultra-broadband optical horn antenna