Abstract

A bandwidth-efficient and low-cost spectral-null-filling scheme simultaneously delivering a 56-Gbps 4-level pulse amplitude modulation (PAM-4) digital signal and a 10 × 400-MHz analog radio frequency (RF) signal on a single wavelength is demonstrated for high-capacity wired and wireless optical access networks. The data rate of the PAM-4 signal is consistent with the next-generation passive optical network (PON), and the PAM-4 signal inherently provides a spectral null at 28 GHz, which can be filled with the RF signal exactly at the 5G-specified millimeter wave (mmW) band. Since pulse shaping is not essential in this hybrid transmission system, a low-cost 2-bit digital-to-analog converter (DAC) is adopted for the PAM-4 signal generation. Volterra nonlinear equalizer is adopted to effectively eliminate the analog-to-digital crosstalk without reserving a frequency gap in between. The digital-analog hybrid signal is simultaneously transmitted over a 25-km standard single-mode fiber in telecom C-band and the impact of chromatic dispersion on the number of supported mmW bands is analyzed. In addition, three types of hybrid transmitters are experimentally demonstrated, among which the first-time proposed IQ-modulator-based hybrid transmitter shows the best performance.

Analog fiber-wireless downlink transmission of IFoF/mmWave over in-field deployed legacy PON infrastructure for 5G fronthauling

K. Kanta, A. Pagano, E. Ruggeri, M. Agus, I. Stratakos, R. Mercinelli, C. Vagionas, P. Toumasis, G. Kalfas, G. Giannoulis, A. Miliou, G. Lentaris, D. Apostolopoulos, N. Pleros, D. Soudris, and H. Avramopoulos
J. Opt. Commun. Netw. 12(10) D57-D65 (2020)

Transmission of 2 × 56  Gb/s PAM-4 signal over 100  km SSMF using 18  GHz DMLs

Shiwei Zhou, Xiang Li, Lilin Yi, Qi Yang, and Songnian Fu
Opt. Lett. 41(8) 1805-1808 (2016)

Optical access networks for fixed and mobile applications [Invited Tutorial]

Yixiao Zhu and Weisheng Hu
J. Opt. Commun. Netw. 16(2) A118-A135 (2024)

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)

Emerging Optical Access Network Technologies for 5G Wireless [Invited]

Xiang Liu and Frank Effenberger
J. Opt. Commun. Netw. 8(12) B70-B79 (2016)