What does 100G optical module mean

A 100G optical module is a high-speed transceiver that enables data transmission at 100 gigabits per second over optical fiber networks.

Definition and Function

A 100G optical module, also known as a 100G transceiver, is a compact device used in fiber-optic communication networks to transmit and receive data at speeds of up to 100 Gbps. It serves as the interface between network equipment, such as switches and routers, and the optical fiber infrastructure, converting electrical signals into optical signals for transmission and vice versa for reception, ensuring high-speed, low-latency communication across long distances .

Form Factor: QSFP28

The most common form factor for 100G optical modules is QSFP28 (Quad Small Form-factor Pluggable 28). QSFP28 modules use four parallel lanes, each capable of 25 Gbps, aggregated to achieve a total throughput of 100 Gbps . This lane-based architecture allows for high port density, low power consumption, and compatibility with existing network hardware, making it ideal for data centers, enterprise networks, and telecom infrastructure .

Transmission Principles

100G optical modules rely on advanced optical and electronic components to modulate light signals. Common modulation techniques include NRZ, PAM4, and coherent modulation, which encode digital data onto optical carriers. Electrical signals from network devices are converted into optical signals by lasers (VCSELs or DFB lasers) and transmitted through multimode or single-mode fibers. At the receiving end, photodetectors convert the optical signals back into electrical signals for processing .

Types and Applications

QSFP28 modules support various transmission types and distances, including:

• 100GBASE-SR4: Parallel multimode fiber, short-range (up to 100m over OM4 fiber)
• 100GBASE-PSM4: Parallel single-mode fiber for longer distances
• 100GBASE-CWDM4: Coarse Wavelength Division Multiplexing over single-mode fiber
• 100GBASE-LR4: Long-range single-mode fiber using four wavelengths These modules are widely deployed in data centers, high-performance computing networks, enterprise core networks, and service provider networks, providing scalable, high-bandwidth connectivity while reducing the number of ports, cables, and power consumption compared to older transceiver generations .

Key Advantages

• High-speed 100 Gbps data transmission
• Compact, hot-swappable design for easy deployment
• Supports multiple fiber types and distances
• Reduces network complexity and power usage
• Compatible with IEEE 100GBASE standards for interoperability In summary, a 100G optical module is a critical component for modern high-speed networks, enabling efficient, reliable, and scalable 100 Gbps optical connectivity.