110-GHz-Bandwidth InP-HBT AMUX/ADEMUX Circuits for Beyond-1-Tb/s/ch Digital Coherent Optical Transceivers
Munehiko Nagatani, Hitoshi Wakita, Teruo Jyo, Tsutomu Takeya, Hiroshi Yamazaki, Yoshihiro Ogiso, Miwa Mutoh, Yuta Shiratori, M. Ida, Fukutaro Hamaoka, Masanori Nakamura, Takayuki Kobayashi, Hiroyuki Takahashi, Yutaka Miyamoto
Abstract
To cope with the rapid growth of communications traffic, 400-Gb/s/ch digital coherent systems are being deployed in optical core networks. However, further scaling is required, and the transmission capacity per channel is expected to exceed 1 Tb/s in the near future to sustain the ever-growing traffic. One of the most significant challenges in achieving a channel capacity of beyond 1 Tb/s is to extend the analog bandwidth of digital-to-analog converters (DACs) and analog-to-digital converters (ADCs) in the optical transceiver. This paper describes InP-HBT-based ultra-broadband analog multiplexer (AMUX) and analog de-multiplexer (ADEMUX) circuits that can extend the analog bandwidth of DACs and ADCs, respectively. In addition, experimental demonstrations of beyond-1-Tb/s/ch optical modulations and transmissions are addressed.