Performance Investigation of Joint LUT and GS Algorithm at the Transceiver for Nonlinear and CD Compensation

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-07-17 DOI:10.3390/photonics11070665

Xiaoying Zhang, Jiahao Huo, Haolin Bai, Peng Qin, Huangfu Wei, Keping Long

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引用次数: 0

Abstract

In order to meet the increasing requirements of speed and distance, an advanced digital signal processing (DSP) algorithm is preferred without changing the system structure in intensity modulation and the direct detection (IM/DD) system. As the transmission distance increases, the power fading induced by dispersion must be mitigated. In addition, linear and nonlinear inter symbol interference (ISI) introduced by bandwidth limitation and device imperfections becomes an obstacle to achieving higher capacity. The Gerchberg–Saxton (GS) algorithm was recently used to compensate for dispersion. In this paper, GS-based pre- and post-compensation schemes in the IM/DD system with nonlinearity were investigated. We investigated and compared the performance of the GS-based pre- and post-compensation algorithm in a 28 GB aud four-level pulse amplitude modulation (PAM-4) transmission over 40 km standard single-mode fiber (SSMF). The bit error rate (BER) achieved a threshold of 3.8 × 10−3 using look-up-table (LUT), FFE, and the GS-based pre-compensation algorithm without iterations. Turning to the GS-based post-compensation scheme, 80 iterations are needed. However, the demand for FFE is reduced. The algorithm selection depends on the tolerance of the transmitter or receiver complexity in specific scenarios. The joint LUT and GS-based pre-compensation algorithm may be a preferable approach in scenarios where a low-complexity receiver is desired.

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用于非线性和 CD 补偿的收发器联合 LUT 和 GS 算法的性能研究

为了满足对速度和距离不断提高的要求，在不改变强度调制和直接检测（IM/DD）系统结构的情况下，最好采用先进的数字信号处理（DSP）算法。随着传输距离的增加，色散引起的功率衰减必须得到缓解。此外，带宽限制和设备缺陷带来的线性和非线性符号间干扰（ISI）也成为实现更高容量的障碍。最近，Gerchberg-Saxton（GS）算法被用来补偿色散。本文研究了具有非线性的 IM/DD 系统中基于 GS 的前补偿和后补偿方案。在 40 千米标准单模光纤（SSMF）上进行的 28 GB aud 四电平脉冲幅度调制（PAM-4）传输中，我们研究并比较了基于 GS 的前补偿和后补偿算法的性能。使用查找表 (LUT)、FFE 和基于 GS 的无迭代预补偿算法，误码率 (BER) 达到了 3.8 × 10-3 的阈值。至于基于 GS 的后补偿方案，则需要 80 次迭代。不过，对 FFE 的要求降低了。算法的选择取决于特定情况下发射机或接收机复杂度的容差。在需要低复杂度接收机的情况下，基于 LUT 和 GS 的联合预补偿算法可能是一种更可取的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.