Abstract

Future high-speed optical communication requires continuous increases in both information rate (IR) and symbol rate. An analog multiplexer (AMUX) interleaves individually generated tributaries at lower rates to form an interleaved high-speed signal, which allows to reuse cost- and power-efficient low bandwidth CMOS DACs to obtain a broadband signal. A 120 GSa/s BiCMOS AMUX is designed based on a high-linearity topology, which enables to generate signal carrying a high information rate (IR). A calibration procedure is adopted to maximize the effective vertical resolution of the output signal. Using this BiCMOS AMUX, real-valued digital-subcarrier-multiplexed probabilistically-constellation-shaped QAM signal is generated for 10 km fiber transmission based on intensity modulation and direct detection (IM/DD). A per-electrical-lane-normalized net data rate (NNDR) of 360 Gbit/s/lane is achieved after 10 km fiber transmission, resulting in a per-electrical-lane-normalized net IR (NNIR) of 3 bit/sym/lane, which is the highest NNIR reported with AMUX-based signal generation. The record NNIR shows the potential of the BiCMOS AMUX to support future high-speed optical transmission in terms of IR and symbol rate.

PDM-16QAM transmission of 135 GBaud enabled by 120 GSa/s DAC and Tomlinson–Harashima pre-coding

Guoxiu Huang, Hisao Nakashima, and Takeshi Hoshida
Opt. Lett. 46(18) 4518-4521 (2021)

Net-400-Gbps PS-PAM transmission using integrated AMUX-MZM

Hiroshi Yamazaki, Masanori Nakamura, Takayuki Kobayashi, Munehiko Nagatani, Hitoshi Wakita, Yoshihiro Ogiso, Hideyuki Nosaka, Toshikazu Hashimoto, and Yutaka Miyamoto
Opt. Express 27(18) 25544-25550 (2019)

Pulse shaping for 112 Gbit/s polarization multiplexed 16-QAM signals using a 21 GSa/s DAC

John C. Cartledge, John D. Downie, Jason E. Hurley, Abdullah S. Karar, Ying Jiang, and Kim Roberts
Opt. Express 19(26) B628-B635 (2011)

Transmission of a 56 Gbit/s PAM4 signal with low-resolution DAC and pre-equalization only over 80 km fiber in C-band IM/DD systems for optical interconnects

Mingzhu Yin, Dongdong Zou, Wei Wang, Fan Li, and Zhaohui Li
Opt. Lett. 46(22) 5615-5618 (2021)

Experimental demonstration of 111.1-Gb/s net information rate using IM/DD probabilistically shaped orthogonal chirp-division multiplexing with a 10-GHz-class modulator

Zhouyi Hu, Yingjie Shao, Xing Ouyang, Yeyu Tong, Jian Zhao, Hon Ki Tsang, Paul D. Townsend, and Chun-Kit Chan
Opt. Express 27(23) 33789-33798 (2019)