Abstract
In many practical scenarios, single-photon avalanche diodes (SPADs) are good solutions to improve the performance of optical communication systems due to their high sensitivity to photon arrival. SPAD receivers can be implemented in large arrays to achieve higher data rates and additional protection against background light; however, they suffer from a significant intersymbol interference (ISI) if the SPAD dead time is comparable or larger than the symbol duration, i.e., sub-dead-time signal transmission. This work proposes a novel detection scheme designed for high-speed SPAD-based systems to effectively mitigate the degradation induced by ISI. Different from traditional receivers, in the proposed scheme, the information extracted from both the counts and arrival times of photons are utilised for the optimal symbol detection in the presence of non-linear and random ISI effect due to dead time. Our extensive numerical and experimental results demonstrate the superiority of the proposed photon time information based detection (PTID) scheme in terms of both BER performance and background light tolerance of the communication link. In addition, a linear approximation of the SPAD-based channel is investigated, which illustrates that the traditional equalization methods are effective under some specific circumstances.
PDF Article
More Like This
Raman lidar at 355 nm using low dead time photon counting for atmospheric aerosol measurements
Feitong Chen, Lingyun Wu, Chuxiao Chen, Xueping Wan, Wentai Chen, Xiaolong Chen, Jianfeng Zhou, Miao Cheng, Zhewei Fu, Naiying Ding, Zhiji Deng, Yibing Shen, Chong Liu, Jian Bai, Lan Wu, Wenbo Sun, and Dong Liu
Appl. Opt. 63(6) 1529-1537 (2024)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription