The S25G-L40-Cxx is a robust 25Gbps CWDM SFP28 optical transceiver designed for long-reach up to 40 km over single-mode fiber. Built with an EML transmitter and an APD receiver, it provides high optical sensitivity and stable performance, making it well suited for 5G fronthaul, metro access, FTTx backhaul, and enterprise optical networks.
This module supports Digital Diagnostics Monitoring (DDM), ensuring real-time visibility into optical power, temperature, voltage, and bias current for reliable network maintenance. With temperature support (0 to 70C /–40C to +85C), it performs steadily in outdoor cabinets, tower base stations, or any harsh environment.
Optimized for CWDM 8-channel deployments, the S25G-L40-Cxx helps network operators increase fiber utilization and scale capacity efficiently, without introducing complexity.
Key Features
• 25.78Gbps data rate
• CWDM wavelengths: 1470–1610 nm (8 channels)
• Up to 40 km reach over SMF (with host FEC)
• 16 dB optical power budget
• EML laser transmitter / APD receiver
• Duplex LC optical interface
• = 1.5W power consumption
• Hot-pluggable SFP28 form factor
• Supports DDM (Digital Diagnostics Monitoring)
• Class 1 Laser, RoHS compliant
Technical Specifications
General
• Form Factor: SFP28, hot-pluggable
• Data Rate: Up to 25.78 Gbps
• Fiber Type: Single-Mode Fiber (SMF)
• Connector: Duplex LC
• Operating Temperature: 0 to 70C and –40°C to +85C
• Compliance: SFP MSA, Class 1 Laser, RoHS
Optical
• Transmission Distance: 40 km (with FEC)
• Optical Budget: 16 dB
• Transmitter Type: EML laser
• Receiver Type: APD
• Tx Output Power: 0 to +5 dBm
• Rx Sensitivity: = –16 dBm
• Receiver Overload: = –4 dBm
Electrical
• Supply Voltage: 3.3V
• Power Consumption: = 1.5W
• Host Interface: SFI, 100 O differential impedance
Monitoring
• Digital Diagnostics (DDM): Temperature, Voltage, Bias, Tx Power, Rx Power
Typical Applications
• 5G / 4G Mobile Fronthaul
• Metro CWDM Access Networks
• FTTx / Broadband backhaul
• Data center interconnect
• Utility and industrial fiber networks