Abstract

We report a new 128 GSa/s SiGe digital to analog converter (DAC) having 8 bit physical resolution and 24 GHz 3-dB bandwidth and present its architecture and the results on fundamental converter assessment. We further integrated the DAC into a coherent optical transmission testbed allowing increase of symbol rate up to 128 GBaud. Using probabilistic constellation shaped modulation formats at an entropy of 7.5 bits per symbol and polarization multiplex we successfully transmitted at net-bit rates up to 1.55 Tb/s for a single carrier in back to back while for a typical data center interconnect (DCI) distance of 80 km a net bit rate of 1.52 Tb/s has been achieved.

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-432-Gb/s/λ PS-PAM transmission based on advanced DSP and single DAC for 400 G/λ IM/DD links

An Yan, Guoqiang Li, Sizhe Xing, Wangwei Shen, Yongzhu Hu, Aolong Sun, Jianyang Shi, Ziwei Li, Chao Shen, Nan Chi, and Junwen Zhang
Opt. Lett. 49(7) 1656-1659 (2024)

Single-carrier 1-Tb/s PDM-16QAM transmission using high-speed InP MUX-DACs and an integrated OTDM modulator

Hiroshi Yamazaki, Akihide Sano, Munehiko Nagatani, and Yutaka Miyamoto
Opt. Express 23(10) 12866-12873 (2015)

Net 400-Gbps/λ IMDD transmission using a single-DAC DSP-free transmitter and a thin-film lithium niobate MZM

Essam Berikaa, Md Samiul Alam, and David V. Plant
Opt. Lett. 47(23) 6273-6276 (2022)

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)