Abstract

The increasing demand for network capacity is driving the development of next-generation high-speed Passive Optical Networks (PON) supporting 25 and 50 Gbps. One solution to reduce transceiver cost is reusing the 10G-class optical transmitter (including Directly Modulated Lasers, DML, in O-band) and receiver components in combination with Digital Signal Processing (DSP) techniques to compensate for bandwidth limitations. In this article, by means of both a set of laboratory experiments and a metropolitan field demonstrator, we discuss practical PON solutions at 25 and 50 Gbps per wavelength and per direction. In terms of modulation formats, we compare 2-level pulse amplitude modulation (PAM-2), 4-level PAM (PAM-4), and electrical duobinary (EDB) modulation formats, with feed-forward (FFE) and decision-feedback (DFE) adaptive equalizer at the receiver side. The novelty of our article is manifold. First, we present an optimization in terms of optical receiver band requirements for the 50 Gbps transmission. We show, by means of experimental measurements and numerical simulations, the minimum required bandwidth for DML laser and APD receiver (with appropriate DSP techniques) to realize next generation 25 and 50 Gbps PON transceivers. Second, we discuss also the upstream point of view, with a specific focus on DSP, and in particular, we propose an experimental solution based on a burst mode receiver with memory-aided DSP technique, together with a novel DSP approach to overcome the typical AC coupling distortion due to the burst mode scenario. Finally, we show a coexistence experiment between XGS-PON and 25 Gbps PON on an installed metropolitan field trial.

Impact of the Overall Electrical Filter Shaping in Next-Generation 25 and 50  Gb/s PONs

Pablo Torres-Ferrera, Valter Ferrero, Maurizio Valvo, and Roberto Gaudino
J. Opt. Commun. Netw. 10(5) 493-505 (2018)

From 25 Gb/s to 50 Gb/s TDM PON: transceiver architectures, their performance, standardization aspects, and cost modeling

Ed Harstead, Rene Bonk, Sheldon Walklin, Dora van Veen, Vincent Houtsma, Noriaki Kaneda, Amitkumar Mahadevan, and Robert Borkowski
J. Opt. Commun. Netw. 12(9) D17-D26 (2020)

Overview of high-speed TDM-PON beyond 50 Gbps per wavelength using digital signal processing [Invited Tutorial]

Pablo Torres-Ferrera, Frank Effenberger, Md Saifuddin Faruk, Seb J. Savory, and Roberto Gaudino
J. Opt. Commun. Netw. 14(12) 982-996 (2022)

DSP-free single-wavelength 100 Gbps SDM-PON with increased splitting ratio using 10G-class DML

Fangdi Bao, Yunhong Ding, Md Nooruzzaman, Yoshimichi Amma, Yusuke Sasaki, Leif K. Oxenløwe, Hao Hu, and Toshio Morioka
Opt. Express 27(23) 33915-33924 (2019)

100-Gb/s TWDM-PON based on 10G optical devices

Zhengxuan Li, Lilin Yi, Honglin Ji, and Weisheng Hu
Opt. Express 24(12) 12941-12948 (2016)