Sturdy-multistage noise-shaping delta-sigma modulator with enhanced noise-coupling and NTF-optimized strategy for intermediate frequency digital mobile fronthaul

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2024-12-27 DOI:10.1016/j.yofte.2024.104110

Anting Xu , Mingzhu Yin , Wei Wang , Liming Chen , Fan Li

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引用次数: 0

Abstract

In this paper, digital mobile fronthaul (MFH) based on the enhanced noise-coupling structure for intermediate frequency (IF) scenarios and noise transfer function (NTF)-optimized strategy sturdy multi-stage noise-shaping delta-sigma (SMASH) modulator is proposed. Without the need for additional integrators, the SMASH modulator with enhanced noise-coupling (SMASH-NC) gains two extra zeros in the signal band, improving the second-order noise shaping capability and achieving a 13.6 dB signal-to-noise rate (SNR) improvement. The NTF-optimized strategy based on genetic algorithm (GA) is proposed to design SMASH-NC. Compared with the SMASH-NC obtained by traditional method, the stability of SMASH-NC of GA method is higher, which supports larger input signals, with a 4.1 dB SNR improvement. We experimentally demonstrate the transmission of orthogonal frequency division multiplexing (OFDM) signals in MFH with the fourth-order SMASH-NC modulator. The OFMD signals at the center frequency of 1.5 GHz are modulated to 5-Gbaud 4-level pulse amplitude modulation (PAM4) signals through the SMASH-NC modulator and transmitted over the intensity modulation direct detection (IM/DD) link and 20 km single-mode fiber (SMF). Experimental results show that OFDM signals can be transmitted up to 65,536 quadrature amplitude modulation (QAM) with the SNR of 52.41 dB. In addition, the fourth-order SMASH-NC scheme has 9.52 % less adders and 29.17 % less multipliers, respectively, in comparison to the traditional fourth-order single-loop delta-sigma modulator (SDSM) scheme.

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.