Key Takeaways & Executive Findings
- •• EMLs offer lower frequency chirp and higher modulation bandwidth compared to DMLs, enabling higher data rates and longer transmission distances. • The article provides a comprehensive review of InP-based EML devices, covering composition, working principles, manufacturing processes, and applications. • Recent advances in EML technology support data rates up to 800 Gbps and beyond, with ongoing development targeting 1.6 Tbps. • EMLs are critical for high-speed optical interconnects in data centers, addressing the growing demand for bandwidth and power efficiency.
Abstract
Currently, the global 5G network, cloud computing, and data center industries are experiencing rapid development. The continuous growth of data center traffic has driven the vigorous progress in high-speed optical transceivers for optical interconnection within data centers. The electro-absorption modulated laser (EML), which is widely used in optical fiber communications, data centers, and high-speed data transmission systems, represents a high-performance photoelectric conversion device. Compared to traditional directly modulated lasers (DMLs), EMLs demonstrate lower frequency chirp and higher modulation bandwidth, enabling support for higher data rates and longer transmission distances. This article introduces the composition, working principles, manufacturing processes, and applications of EMLs. It reviews the progress on advanced indium phosphide (InP)-based EML devices from research institutions worldwide, while summarizing and comparing data transmission rates and key technical approaches across various studies.
1. Introduction
In recent years, the rapid development of industrial applications, including cloud computing, big data, ultra-high-definition video streaming, artificial intelligence, and 5G networks, has led to a substantial increase in network access frequency, diversified access methods, and rapid growth in data traffic. This trend imposes stringent requirements on data center interconnections and creates a growing demand for short-reach broadband transmission solutions[1]. From 2015 to 2020, cloud computing traffic surged from 3.9 to 14.1 ZB, driving the evolution of data center architecture from 10/25 to 40/100 GbE standards. Consequently, this transition has significantly amplified the demand for high-speed optical transceivers. Current optical module rates have progressed from 400 to 800 Gbps, with ongoing development targeting 1.6 Tbps, thereby accelerating innovations in high-speed optoelectronic devices[2].
Future data traffic growth will continue to concentrate in data centers, requiring operators not only enhance the capacity of server optical interconnect but also effectively manage power consumption in data centers. This dual challenge makes power efficiency in optical interconnects particularly critical. Directly modulated lasers (DMLs) have been widely adopted in data centers due to their low power consumption and cost-effectiveness. However, their modulation speed is fundamentally limited by the relaxation oscillation frequency—a physical phenomenon resulting from carrier-photon interactions—as they employ intensity modulation, whe
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Zhenyao Li, Chen Lyu, Xuliang Zhou, Mengqi Wang, Haotian Qiu, Yejin Zhang, Hongyan Yu, Jiaoqing Pan (2025). High-speed electro-absorption modulated laser. SinoTechIntel Verified Research. https://doi.org/10.1088/1674-4926/25030015
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Frequently Asked Questions
What is an electro-absorption modulated laser (EML)?
An electro-absorption modulated laser (EML) is a high-performance photoelectric conversion device that integrates a laser with an electro-absorption modulator. It is widely used in optical fiber communications, data centers, and high-speed data transmission systems, offering lower frequency chirp and higher modulation bandwidth compared to directly modulated lasers (DMLs).
How does an EML differ from a directly modulated laser (DML)?
EMLs achieve modulation by varying the absorption of light through an applied electric field, whereas DMLs modulate the laser's drive current. EMLs exhibit lower chirp and higher modulation bandwidth, enabling support for higher data rates and longer transmission distances.
What are the key applications of EMLs?
EMLs are primarily used in high-speed optical transceivers for data center interconnects, optical fiber communications, and other high-speed data transmission systems. They are essential for meeting the growing bandwidth demands of cloud computing, 5G networks, and artificial intelligence.
What are the recent advances in EML technology?
Recent advances in InP-based EML devices have achieved data transmission rates up to 800 Gbps and beyond, with ongoing research targeting 1.6 Tbps. These improvements are driven by innovations in device design, manufacturing processes, and integration techniques.
Why are EMLs important for data centers?
EMLs are critical for data centers because they provide high modulation bandwidth and low chirp, enabling high-speed, long-reach optical interconnects while maintaining power efficiency. This helps data centers manage the exponential growth in traffic while controlling energy consumption.
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