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https://www.gearlinkoptic.com/products/sfp-10g-1310nm-40km-lc-transceiver/

SFP+ 10G 1310nm 40Km LC Transceiver is a hot-pluggable SFP+ package/dual LC interface, with DDM digital diagnosis function, metal shell package effectively reduces electromagnetic interference; complies with SFP+ MSA protocol; complies with SDH/SONET transmission standards; complies with SFF-8431; Specifications conform to SFF 8472; 10G 40km dual-fiber optical modules are commonly used in data centers, base stations, metropolitan area networks, local area networks, storage networks, Fibre Channel, fibre-to-the-home and wireless networks.

Compatibility of SFP+ 10G 1310nm 40Km LC Transceiver
EX-SFP-10G-ER4010GBASE-ER SFP+ 1310nm 40km

Technical Specification Of SFP+ 10G 1310nm 40Km LC Transceiver

Absolute Maximum Ratings
ParameterSymbolUnitMinMax
Storage Temperature RangeTsoC-4085
Relative HumidityRH%095

Recommended Operating Conditions
Electrical Characteristics (Tc=0 oC to 70 oC and Vcc= 3.14 to 3.46)
ParameterSymbolUnitMinTypMaxNote
Supply VoltageVCCV3.143.33.46
Supply CurrentIccmA285
Transmitter
Input Differential ImpedanceRINΩ惟80100120
Differential Data Input SwingVINMVP-p180700
Transmit Disable VoltageVIDSV2VCCHOST
Transmit Enable VoltageVENVVEEVEE +0.8
Transmit Fault Assert VoltageVFAV2.2VCCHOST
Transmit Fault De-Assert VoltageFDAVVEEVEE +0.4
Receiver
Differential Data Output SwingVOIDMVP-p450600850
Output Rise TimeTrishpS25
Output Fall TimetFALLpS25
LOS FaultVLOSFTV2VCCHOST
LOS NormalVLOSNRVVEEVEE +0.8

Can 40km optical transceiver s and 80km optical transceivers be used together?
As long as the received power is within the range. But it is not recommended to use it like this. If the light is too strong, add an attenuator. Otherwise it will affect the life of the transceiver . If the light is weak, it is also prone to packet loss.

As an optical module supplier, we will do our best to meet all the needs of customers.