CMOS Optical 4-PAM VCSEL Driver with ModalDispersion Equalizer for 10Gb/s 500m MMF Transmission

📋 论文概要

本文提出了一种采用4-PAM调制的CMOS VCSEL驱动器，集成了模态色散均衡器，旨在克服商用VCSEL调制频率限制，实现在500m多模光纤上10Gb/s的数据传输。通过4-PAM降低带宽需求，并用均衡器补偿光纤色散，从而提升传输距离和速率。

💡 主要创新点

• 首次将4-PAM调制应用于VCSEL驱动器中，有效降低了对VCSEL带宽的要求，使得10Gb/s传输成为可能。
• 集成了模态色散均衡器，用于补偿多模光纤中的模态色散，从而支持500m的传输距离。
• 采用CMOS工艺实现，兼顾了低成本和高速性能，适合大规模集成。

🏷 关键词

📄 原文摘要

Data communication over 300m of distance, such as Ethernet standards, where the required data rate per channel reaches 10Gb/s or more, demand optical transmission [1]. Vertical-cavity surface-emitting laser (VCSEL) and multimode optical fiber (MMF) are usually used in such optical transmission systems, because they offer several advantages such as ease of assembly and optical alignment for cost reduction. The modulation frequency of commercial VCSEL devices is limited to approximately 10GHz. To overcome this limitation, solutions are reported in [2, 3]. However, these papers merely describe that the modulation frequency of VCSEL can be extended by equalization. On the other hand, the transmission performance of MMF is generally defined by the product of transmission distance and modulation frequency. In a commercial graded-index (GI) MMF, the transmission performance stays about 500MHzkm due to modal dispersion. In the case of 10Gb/s data transmission, the

👥 作者与机构

Daisuke Watanabe, Atsushi Ono, Toshiyuki Okayasu

Advantest, Gunma, Japan