Design Study for an Efficient Semiconductor Quantum Light Source Operating in the Telecom C-band Based on an Electrically-Driven Circular Bragg Grating.

Andrea Barbiero,Jan Huwer, Joanna Skiba-Szymanska,Tina Muller,R. Mark Stevenson,Andrew J. Shields

Optics Express（2022）SCI 2区

Toshiba Europe Ltd

Cited 22|Views22

Abstract

The development of efficient sources of single photons and entangled photon pairs emitting in the low-loss wavelength region around 1550 nm is crucial for long-distance quantum communication. Moreover, direct fiber coupling and electrical carrier injection are highly desirable for deployment in compact and user-friendly systems integrated with the existing fiber infrastructure. Here we present a detailed design study of circular Bragg gratings fabricated in InP slabs and operating in the telecom C-band. These devices enable the simultaneous enhancement of the X and XX spectral lines, with collection efficiency in numerical aperture 0.65 close to 90% for the wavelength range 1520 - 1580 nm and Purcell factor up to 15. We also investigate the coupling into a single mode fiber, which exceeds 70% in UHNA4. Finally, we propose a modified device design directly compatible with electrical carrier injection, reporting Purcell factors up to 20 and collection efficiency in numerical aperture 0.65 close to 70% for the whole telecom C-band.

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