Dual-mode SFF optical module model

Dual-mode SFF optical modules are compact, hot-pluggable transceivers supporting dual-fiber bidirectional communication with speeds from 155 Mbps to 2.5 Gbps, operating over multimode or single-mode fibers with LC connectors.

Key Electrical and Optical Characteristics

• Transmission Speeds: Modules support 155 Mbps, 1.25 Gbps, and 2.5 Gbps, suitable for Fast Ethernet, ATM, and FDDI PMD standards .
• Fiber Type: Dual-mode SFF modules can operate over multimode fibers (MMF) for short distances (300 m to 2 km) and single-mode fibers (SMF) for longer distances (up to 160 km depending on model), .
• Connector Type: Dual-fiber modules typically use LC connectors, while single-fiber variants may use SC connectors .
• Signal Levels: Differential CML input/output levels are standard, with transmitter input amplitude ranging from 200–2000 mVpp and receiver output amplitude from 300–1200 mVpp, with impedance of 90–110 ohms .
• Optical Performance: Extinction ratio ≥ 8.2 dB, transmit cutoff optical power ≤ -40 dBm, and receive sensitivity from -19 dBm to -34 dBm depending on the model .

Power and Environmental Specifications

• Supply Voltage: Operates from a single +3.3 V power supply .
• Power Consumption: Varies by module type; designers should consider maximum rated power for thermal management .
• Temperature Grades: Military-grade (J) modules: -40°C to +85°C; Extended-grade (M) modules: -55°C to +85°C .
• EMI/ESD Protection: Extremely low electromagnetic interference and excellent electrostatic discharge protection for industrial and networking environments .

Management and Compliance

• Standards Compliance: Modules comply with Class I laser safety (IEC-60825) and RoHS 2.0 standards .
• Diagnostics: Many SFF modules support DDM/DOM for real-time monitoring of temperature, voltage, and Tx/Rx power .
• Form Factor: SFF modules conform to MSA-defined mechanical dimensions, ensuring compatibility with host cages and LC sockets .

Applications

Dual-mode SFF optical modules are widely used in:

• Ethernet switches and routers
• Fiber Channel networks
• Industrial and military-grade communication systems
• Data centers and carrier-grade deployments These modules provide flexible, high-performance optical connectivity for both short-range multimode and long-range single-mode fiber links, making them suitable for diverse networking scenarios .