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The development of efficient sources of single photons and entangled photonpairs emitting in the low-loss wavelength region around 1550 nm is crucial forlong-distance quantum communication. Moreover, direct fiber coupling andelectrical carrier injection are highly desirable for deployment in compact anduser-friendly systems integrated with the existing fiber infrastructure. Herewe present a detailed design study of circular Bragg gratings etched in InPslabs and operating in the telecom C-band. These devices enable thesimultaneous enhancement of the X and XX spectral lines, with collectionefficiency in NA=0.65 close to 90% for the wavelength range 1520-1580 nm andPurcell factor up to 15. We also investigate the coupling into single modefiber, which exceeds 70% in UHNA4. Finally, we propose a modified device designdirectly compatible with electrical carrier injection, reporting Purcellfactors up to 20 and collection efficiency in NA=0.65 close to 70% for thewhole telecom C-band.

optics express

Design study for an efficient semiconductor quantum light source  operating in the telecom C-band based on an electrically-driven circular  Bragg grating