Abstract

The symbol rate in Giga-bit Ethernet communications continues to increase toward 100 Gbaud at a data rate of 1.6 Tbps [1] and even higher for future Ethernet communications, where a broad bandwidth of over 100 GHz will be crucial for key photonic devices. Moreove, high-speed wireless communications beyond 5G, such as 6G, will be another significant leap in the communication market. Here, the new radio band shifts toward frequencies higher than 100 GHz to use the unused frequency band beyond 5G. The D-band (110–170 GHz) [2] is a promising candidate in this region. A D-band high-speed photodetector is one of the key components in analog radio over fiber technology for future wireless communications. In this paper, we present an ultra-broadband high-speed UTC-PD using well-optimized and extremely thin active layers to achieve 200-GHz bandwidth and beyond. The characteristics of the fabricated device are discussed, along with the simulation results.

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