Optical Communication / Data Transmission

Mainstream Wavelengths: 1310nm, 1550nm (primarily DFB/EML), some 850–980nm

Core Functions / Advantages: High power, narrow linewidth, low chirp, long-distance single-mode/multi-mode transmission

Typical Terminal Scenarios: Long-distance/medium-distance optical modules (telecom backbone, submarine cable, metropolitan area network, 5G/6G fronthaul/backhaul), long-distance data center interconnection (>500m–100km+)

Sensing / LiDAR / Ranging / Industrial Sensing

Mainstream Wavelengths: 850–940nm (905nm is mainstream), some 1550nm

Core Functions / Advantages: High peak power (pulse mode), narrow pulse width, long-range ranging

Typical End-User Scenarios: Automotive/Robot/Drone LiDAR (long-range mechanical/solid-state/hybrid, ADAS/Autonomous Driving), Industrial Ranging/Obstacle Avoidance, Gas/Fiber Optic Sensing, Machine Vision, Security Monitoring

Industrial Processing / Medical / Other Emerging Markets

Mainstream Wavelengths: Near Infrared (780–1100nm) + Mid-to-Far Infrared (some related to QCL, but EEL is mainly near IR)

Core Functions / Advantages: High-power CW/Pulsed Laser, Precision Heating/Cutting/Penetration

Typical End-Use Scenarios: Laser Welding/Cutting/Marking/Cladding (Precision Metals/Electronics), Medical Surgery/Ophthalmology/Cosmetic/Phototherapy, Pumping Fiber Lasers, Scientific Instruments/Spectroscopic Analysis

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IR VCSEL EEL