112-Gb/s PAM-4 IM/DD Optical Transmission over 100-km Single Mode Fiber with Linear Equalizer

Abstract

We propose a hybrid linearization algorithm combining the multi-constraint iteration and linear equalization. We experimentally demonstrate a 112-Gb/s PAM-4 signal transmission over 100-km SSMF in IM/DD optical transmission system with one single-ended photodiode.

Adaptive Hybrid Iterative Linearization Algorithms for IM/DD Optical Transmission Systems

“…The hybrid MCIA also includes a two-stage adaptive dispersion estimator to further alleviate its sensitivity against initial dispersion estimation errors. Therefore, this paper is a significant extension of our previously published papers, where the MCIA [20] and the hybrid MCIA [20,22] have been reported, by proposing and subsequently verifying the novel adaptive hybrid iterative linearization algorithm, which has a considerably enhanced performance tolerance to both CD estimation errors and the ISI effect. In order to gain an in-depth understanding of the newly proposed algorithm, in this paper, detailed discussions are made of the algorithm's design structure and its operating principles as well as numerical and experimental verifications of the algorithm.…”

“…Since equalization prior to the G-S iteration would destroy the response of fiber dispersion, this may result in non-convergence of the G-S algorithm. To combat the bandwidth limitation, we insert an inner FFE pair into the MCIA iteration [22], as shown in Fig. 1.…”

“…Following the MCIA-based experimental demonstration of 112-Gb/s PAM-4 signals over 100-km SSMF transmissions in [22], figure 11(a) shows the experimental setup. An encoded PAM-4 waveform is loaded to an 8-bit DAC operating at 92 GSa/s, which then passes through a broadband radio frequency amplifier (RFA, CENTELLAX OA4MVM3) and is modulated onto a 1550-nm wavelength using an MZM (Fujitsu FTM7937EZ) with a bandwidth of 35 GHz.…”

“…In addition to the SSBI effect, the effects associated with limited bandwidths of low-cost components involved the IM/DD transmission systems also cause significant signal distortions in high-speed IM/DD systems. As the conventional G-S algorithms only recover the optical field without effectively minimizing the limited bandwidth effect, the conventional G-S-class algorithms may still fail because of its intrinsic model-basing property [22]. Furthermore, the estimation error in fiber dispersion may also exert unwanted negative impacts on achievable overall linearization performances.…”

High-Speed Optical Fiber Communication in China

“…123−159 In order to meet this long-transmission and large-capacity broadband optical f iber communication, many universities, research institutes, telecom equipment manufacturers, and telecom operators in China have invested huge f inancial resources to investigate it. As can be seen from the top international conference on optical fiber communication (OFC 2022), in the field of optical fiber communication research, major Chinese universities include Huazhong University of Science and Technology, 160 Beijing University of Posts and Telecommunications, 161 Fudan University, 162 Shanghai Jiao Tong University, 163 Peking University, 164 University of Electronic Science and Technology of China, 165 University of Science and Technology of China, 166 University of Science & Technology Beijing, 167 Sun Yat-Sen University, 168 Xi'an University of Posts and Telecommunications, 169 Research institutes include China Mobile Research Institute, 170 China Information Communication Technologies Group Corporation, 171 Nokia Bell Laboratories (Shanghai), 172 Peng Cheng Laboratory, 173 Telecommunication Giants Huawei, 174 ZTE, 175 FiberHome, 176 etc. They have conducted in-depth research on ultrahigh-speed long-distance transmission, especially in coherent light detection technology based on digital signal processing, and achieved a series of record-breaking research results.…”