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Overview of 400G Optical Transceiver

Overview of 400G Optical Transceiver

In today's rapidly evolving world of interconnected devices and data-intensive applications, businesses and organizations require a robust and high-speed networking infrastructure to stay competitive. As the volume of data continues to surge, there is an urgent need for faster and more efficient data transmission solutions. The 400G optical transceiver has emerged as the latest innovation in high-speed networking, offering unprecedented speed and capacity to meet the growing demand for bandwidth-intensive applications.

What Is 400G Optical Transceiver

The 400G optical transceiver, also referred to as the 400G optical transceiver module, serves a crucial role in facilitating photoelectric conversion within network systems. At the transmitting end, optical transceiver converts electrical signals into optical signals, which are then transmitted through optical fibers. Upon reaching the receiving end, these optical signals are converted back into electrical signals.

When constructing a 400G network system, the inclusion of reliable 400G optical transceiver is essential for ensuring optimal performance. These optical transceiver can be categorized based on various factors, including the optical wavelength, signal modulation method, and transmission distance. Here are some common classifications:

Optical Wavelength: Based on the wavelength of light, 400G optical transceiver can be divided into multimode and single mode optical transceiver. Multimode modules are typically suited for shorter distances within data centers, while single mode modules are employed for longer transmission distances.

Modulation Technology: From the perspective of modulation technology, 400G optical transceiver can be categorized into two main types: NRZ and PAM4. Currently, PAM4 modulation is predominantly used due to its ability to achieve higher data rates.

Transmission Distance: Depending on the required transmission distance, 400G optical transceiver are available in different variants, including 400G SR8, 400G DR4, 400G FR4, 400G LR4, and 400G ZR 400G optical transceiver. Each variant offers specific transmission distance, allowing network systems to adapt to varying distance requirements.

The Form-Factors of 400G Optical Transceivers

QSFP-DD (Quad Small Form Factor Pluggable Double Density): DD qsfp optical transceiver is a compact and high-density form factor that supports 8 lanes of 50 Gbps each, resulting in a total data rate of 400 Gbps.

Overview of 400G Optical Transceiver

OSFP (Octal Small Form Factor Pluggable): OSFP optical transceiver supports 8 lanes of 50 Gbps each, providing a total data rate of 400 Gbps. OSFP optical transceiver supports are slightly larger than QSFP-DD optical transceiver but offer better thermal performance.


CFP8 (C Form-factor Pluggable): CFP8 optical transceiver supports 16 lanes of 25 Gbps each, resulting in a total data rate of 400 Gbps. CFP8 optical transceiver are backward compatible with existing CFP and CFP2 interfaces, making them suitable for upgrading older network equipment to higher speeds. However, due to their larger size, CFP8 optical transceiver are not as widely adopted as QSFP-DD and OSFP optical transceiver.



The 400G optical transceivers play a crucial role in meeting the increasing demand for higher data transmission rates in modern communication networks. They provide faster speeds, enhanced capacity, and improved efficiency, enabling the development of advanced applications that require high-performance networking infrastructure.

UnitekFiber stands as a premier SFP Optical Transceiver supplier, providing an extensive array of 100G optical transceiver, 200G optical transceiver, and  400G optical transceiver tailored to diverse networking and data communication needs.  We offer a diverse portfolio of products, including QSFP-DD optical transceivers, QSFP56 optical transceiver, and other SFF optical transceivers, designed to meet the evolving demands of modern data centers, telecommunications networks, and enterprise environments. If you have any inquiry, please contact us by email at sales@unitekfiber.com.

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