Real-time DSP-Free 40 Gbit/s PAM4 transmission over 10 km fiber enabled by optical injection locking of directly modulated laser

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical and Quantum Electronics Pub Date : 2024-11-16 DOI:10.1007/s11082-024-07754-0

Gleb Nazarikov, Simon Rommel, Idelfonso Tafur Monroy

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引用次数: 0

Abstract

We present a comprehensive performance analysis of injection-locked directly modulated laser (DML) for optical communication systems, focusing on both non-return-to-zero (NRZ) and 4-level pulse amplitude modulation (PAM4) signal transmission. We demonstrate real-time PAM4 40 Gbit/s transmission over 10 km of single-mode fiber enabled by optical injection locking without pre-emphasis or post-equalization, achieving a bit error rate (BER) below \({10^{-6}}\), and doubling capacity compared to unlocked transmission with the same laser. Our study investigates the dependence of system performance on the injected power and frequency offset of the master laser. Results indicate that lower injection powers while maintaining a stable locking regime, yield better performance in terms of extinction ratio and BER. Optimized parameters lead to enhanced transmission performance, providing valuable insights into the design and optimization of injection-locked DML systems for optical communication applications employing direct modulation.

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通过直接调制激光器的光注入锁定，在 10 千米光纤上实现无 DSP 的 40 Gbit/s PAM4 实时传输

我们对用于光通信系统的注入锁定直接调制激光器（DML）进行了全面的性能分析，重点关注非归零（NRZ）和四级脉冲幅度调制（PAM4）信号传输。我们演示了在10千米单模光纤上通过光注入锁定实现的40 Gbit/s实时PAM4传输，无需预加重或后均衡，误码率（BER）低于\({10^{-6}}\)，与相同激光器的解锁传输相比，容量增加了一倍。我们的研究调查了系统性能对主激光器注入功率和频率偏移的依赖性。结果表明，在保持稳定锁定机制的同时，较低的注入功率可在消光比和误码率方面产生更好的性能。优化参数可提高传输性能，为采用直接调制的光通信应用中注入锁定 DML 系统的设计和优化提供了宝贵的见解。

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

Optical and Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.60

自引率

20.00%

发文量

810

审稿时长

3.8 months

期刊介绍： Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest. Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.