Optical modules Gigabit and 100Mbps

Gigabit optical modules (1G) and 100Mbps optical modules serve different network speeds and applications, with 1G modules supporting higher bandwidth and modern data center deployments, while 100Mbps modules remain relevant for legacy, industrial, and long-reach Fast Ethernet networks.100Mbps Optical Modules100BASE-FX SFP transceivers are designed for Fast Ethernet (100Mbps) over fiber, typically using multimode fiber at 1310nm wavelength . They support distances up to 2 km, providing stable full-duplex communication and strong immunity to electromagnetic interference compared to copper 100BASE-TX connections . These modules are widely used in industrial networks, legacy enterprise systems, surveillance networks, and campus backbones where reliability and noise resistance are critical . The SFP form factor allows hot-swappable deployment in switches, routers, and media converters, offering flexibility for network upgrades or maintenance .Gigabit Optical ModulesGigabit optical modules (1G SFPs) provide 1Gbps Ethernet connectivity over fiber, supporting both multimode and single-mode fiber depending on the module type . They are commonly used in enterprise networks, data centers, and telecom applications where higher bandwidth is required. Gigabit SFPs can support distances ranging from 100 meters to several kilometers, depending on fiber type and transceiver specifications . These modules are also hot-swappable and compatible with standard SFP ports, enabling flexible network design and scalability .High-Speed 100G ModulesFor modern high-performance networks, 100G QSFP modules (e.g., QSFP-100G, QSFP28) provide extremely high bandwidth for data centers and core network layers . These modules support link lengths of up to 70m over OM3 and 100m over OM4 multimode fiber, using MPO or LC connectors . Advanced modules like the GIGALIGHT QSFP28 SR BiDi use bidirectional VCSELs to transmit 100Gbps over duplex LC fiber, converting multiple electrical channels into high-speed optical signals . These are suitable for high-density, low-latency, and high-throughput environments.Key DifferencesFeature100Mbps SFP1Gbps SFP100G QSFP/QSFP28Speed100Mbps1Gbps100GbpsFiber TypeMultimode (1310nm)Multimode/Single-modeMultimode (OM3/OM4)Max DistanceUp to 2 km100m–10 km+70–100 m (OM3/OM4)Form FactorSFPSFPQSFP/QSFP28ApplicationsLegacy, industrial, surveillanceEnterprise, telecom, data centerHigh-performance data centers, core networksEMI ImmunityHighHighHighDeployment Considerations100Mbps modules are ideal for maintaining legacy networks or industrial systems where high bandwidth is not required but reliability and EMI resistance are critical .Gigabit modules are standard for modern enterprise networks, offering higher throughput and longer reach for backbone and aggregation links .100G QSFP modules are used in high-density data centers and HPC environments, where multiple 100Gbps links are aggregated for massive bandwidth .Compatibility with existing switches, fiber type, and connector type (LC, MPO) must be verified before deployment. In summary, 100Mbps optical modules remain relevant for legacy and industrial applications, while Gigabit and 100G modules are essential for modern high-speed networks, with QSFP28 modules providing the highest bandwidth for data center and core network deployments.