100G LR4 Transceiver

What is a 100G LR4 Transceiver?

100G LR4 transceiver is an optical transceiver module in high-speed data communication networks. It is designed to support a data transmission rate of 100 Gigabits per second (100G) over a long distance using single-mode fiber (SMF) cables. The “LR4” in its name stands for “Long Reach 4-wavelength,” indicating its ability to transmit data over four different wavelengths.

Functional Components of 100G LR4 Transceiver

Multiplexer and Demultiplexer: The multiplexer combines the four optical signals from the laser diodes into a single composite optical signal. The demultiplexer at the receiving end separates the composite optical signal into its components.

Photodiodes: The transceiver incorporates four photodiodes, each tuned to the specific wavelength of the laser diodes. They detect and convert the optical signals into electrical signals for data reception.

Optical Transmitter and Receiver: The optical transmitter consists of laser diodes, EAMs, and multiplexers. It prepares the optical signal for transmission. The optical receiver consists of the demultiplexer and photodiodes, receiving the optical signal and converting it into electrical signals.

Clock and Data Recovery (CDR) Circuit: The CDR circuit extracts the clock and data signals from the received electrical signals. It helps recover the original data transmitted over the fiber optic cable.

Digital Signal Processing (DSP) Chip: The DSP chip performs various signal processing functions, including equalization, error correction, and signal optimization. It enhances the quality and integrity of the received data.

Control and Monitoring Interface: The transceiver includes a control and monitoring interface, which allows for configuration, status monitoring, and performance management of the transceiver. It enables communication with the host device or network management system.

The highlight of the 100G LR4 Transceiver

High Speed: The 100G LR4 transceiver is designed to transmit and receive data at 100 gigabits per second (Gbps). 

Long Reach: The 100G LR4 optical module is optimized for long-distance transmissions, typically up to 10 kilometers (6.2 miles) over single-mode fiber optic cables. 

WDM(Wavelength Division Multiplexing): The 100G LR4 transceiver employs Wavelength Division Multiplexing (WDM) to transmit multiple data channels over a single fiber. It utilizes four specific wavelengths, 1295.56 nm, 1300.05 nm, 1304.58 nm, and 1309.14 nm, to achieve higher data rates and increased capacity.

Compact Form Factor: The 100G LR4 transceiver is typically available in a compact form factor known as the QSFP28 (Quad Small Form-factor Pluggable). This small and hot-pluggable module allows for easy installation and removal in network devices, reducing downtime and improving flexibility.

Industry Standard: The 100G LR4 transceiver follows industry standards and protocols, ensuring compatibility with a wide range of networking equipment and systems. It can be used in various networking environments, including data centers, telecommunications networks, and high-capacity enterprise networks.

Monitoring and Management Capabilities: The 100G optical module transceiver typically includes a control and monitoring interface, allowing for real-time monitoring of the transceiver’s performance parameters, such as temperature, power levels, and signal quality. It enables network administrators to manage and troubleshoot network issues efficiently.

100G LR4 Optical Module, How does it work?

The 100G LR4 transceiver works by converting electrical signals to optical signals for transmission at the transmitter side and then converting the received optical signals back to electrical signals at the receiver side. Laser diodes generate optical signals of specific wavelengths, and electrical absorption modulators (EAMs) modulate the intensity of these signals based on the incoming electrical data. A multiplexer combines these modulated optical signals into a composite signal for transmission. By utilizing these techniques, the transceiver is able to efficiently transmit and receive data over long distances, making it an essential component of high-bandwidth network applications.

100G LR4 Transceiver Application

The 100G LR4 transceiver is widely used in data center networks, enabling high-speed communication between servers, switches, and storage systems. It supports data replication, backup, and migration tasks, meeting the demands of bandwidth-intensive applications like cloud computing. In telecommunications networks, the 100G optical module facilitates the transmission of large data volumes over long-haul fiber optic links. Its long-reach capabilities ensure efficient connectivity between network nodes, delivering seamless voice, video, and data transmission. In an enterprise network environment, the transceiver provides high-performance connectivity, connecting multiple locations or remote data centers and enhancing productivity in data-intensive industries like finance and healthcare.


The 100G LR4 transceiver makes a significant advancement in optical transceiver technology. Its ability to transmit data at 100 Gbps over long distances has become a key enabler for bandwidth-intensive applications and networks. Whether in data centers, telecommunications infrastructure, or enterprise networks, the transceiver ensures fast, reliable, and high-quality data communication. 

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