Wavelength of lc optical module

LC optical modules typically operate at 850 nm, 1310 nm, or 1550 nm, depending on fiber type and transmission distance.

Standard Wavelengths

LC optical modules use specific wavelengths to match fiber type and application requirements:

• 850 nm: Primarily used for multimode fiber (MMF) in short-reach applications such as intra-data center links. Modules like 10G SR, 25G SR, and 400G SR4 often use 850 nm for high-bandwidth, short-distance transmission (up to ~100 meters on OM4 fiber) .
• 1310 nm: Designed for single-mode fiber (SMF), supporting medium-reach links such as campus or metro networks. This wavelength reduces modal dispersion and allows longer distances than 850 nm .
• 1550 nm: Also for single-mode fiber, optimized for long-haul or extended-reach applications. It offers low attenuation and is commonly used in DWDM systems and long-distance optical networks .

High-Density and Parallel Optics

For modern high-speed networks (100G, 200G, 400G), LC modules are used in duplex or parallel configurations:

• 400G SR4 modules: Use 4 channels at 850 nm for multimode fiber, supporting short-range intra-data center links .
• 400G SR4.2 modules: Employ multiple wavelengths (850 nm and 910 nm) to increase capacity over multimode fiber .
• LC connectors remain dominant in duplex serial optics for 10G–400G links, even as MPO and parallel optics grow .

Considerations for Deployment

• Fiber type compatibility: 850 nm for MMF, 1310/1550 nm for SMF.
• Distance and attenuation: Short-reach links use 850 nm; longer links require 1310 or 1550 nm.
• Network design: Wavelength choice affects dispersion, link margin, and whether optical amplification or DWDM is feasible .
• Connector type: LC modules are typically simplex or duplex, with UPC or APC polish depending on application . In summary, LC optical modules are wavelength-specific devices, with 850 nm, 1310 nm, and 1550 nm being the most common, chosen based on fiber type, distance, and network architecture requirements. High-speed modules may use multiple wavelengths in parallel to maximize bandwidth while maintaining LC connector compatibility.