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Extremely low excess noise and high sensitivity AlAs0.56Sb0.44 avalanche photodiodes

Yi, Xin, Xie, Shiyu ORCID:, Liang, Baolai, Lim, Leh W., Cheong, Jeng S., Debnath, Mukul C., Huffaker, Diana L. ORCID:, Tan, Chee H. and David, John P. R. 2019. Extremely low excess noise and high sensitivity AlAs0.56Sb0.44 avalanche photodiodes. Nature Photonics 13 , pp. 683-686. 10.1038/s41566-019-0477-4

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Fast, sensitive avalanche photodiodes (APDs) are required for applications such as high-speed data communications and light detection and ranging (LIDAR) systems. Unfortunately, the InP and InAlAs used as the gain material in these APDs have similar electron and hole impact ionization coefficients (α and β, respectively) at high electric fields, giving rise to relatively high excess noise and limiting their sensitivity and gain bandwidth product1. Here, we report extremely low excess noise in an AlAs0.56Sb0.44 lattice matched to InP. A deduced β/α ratio as low as 0.005 with an avalanche region of 1,550 nm is close to the theoretical minimum and is significantly smaller than that of silicon, with modelling suggesting that vertically illuminated APDs with a sensitivity of −25.7 dBm at a bit error rate of 1 × 10−12 at 25 Gb s−1 and 1,550 nm can be realized. These findings could yield a new breed of high-performance receivers for applications in networking and sensing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Nature Publishing Group
ISSN: 1749-4885
Date of First Compliant Deposit: 15 July 2019
Date of Acceptance: 29 May 2019
Last Modified: 07 Nov 2023 18:48

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