100g coherent optical module wavelength

100G optical modules operate over wavelengths including 850 nm, 1310 nm, 1550 nm, and tunable C-band, depending on the module type and application. Common Wavelengths by Module TypeShort Reach (SR4): Uses 850 nm multimode fiber for distances up to 100 meters, typically in data center environments. Long Reach (LR4) and FR/DR Single Lambda Modules: Use 1310 nm single-mode fiber, supporting distances from 2 km up to 10 km for FR and up to 500 m for DR in data center leaf-spine connections.

Extended Reach (ER4): Operates at 1550 nm, suitable for metro and long-haul networks, often reaching tens of kilometers.

Z

R Coherent Modules: Tunable across the C-band (approximately 1530–1565 nm), enabling long-distance DWDM transmission up to 300 km over amplified fiber. Single Lambda vs Multi-Wavelength ModulesSingle Lambda 100G Modules: Transmit 100G on a single wavelength using PAM4 modulation, simplifying optical design, reducing cost, and lowering power consumption. Examples include 100GBASE-DR and 100GBASE-FR modules.

Multi-

Wavelength Modules (e.g., LR4, CWDM4, SR4): Use four 25G channels either in parallel or via WDM, requiring more complex optical components and packaging.

Applications

Data Centers: Short-reach 850 nm and 1310 nm modules connect servers, switches, and leaf-spine layers efficiently. Telecommunications and Metro Networks: 1310 nm and 1550 nm modules support longer distances between data centers and network nodes.

High-

Performance Computing and Cloud: Single-lambda modules provide high-speed, low-latency connections for compute clusters and storage networks. In summary, the wavelength of a 100G optical module depends on its type and intended reach, ranging from 850 nm for short-reach multimode links to 1310 nm and 1550 nm for single-mode and long-haul applications, with C-band tunable options for coherent DWDM systems.