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Should both Fiber SFP modules show a laser light in one of the two (duplex) receptacles? : r/HomeNetworking
![Amazon.com: Centopto 2-Pack 1.25G SFP Optical Transceiver 1000Base-LX/LH, 1310nm SMF, Up to 20km Dual LC Single-Mode Fiber SFP Module 0~70℃ : Electronics Amazon.com: Centopto 2-Pack 1.25G SFP Optical Transceiver 1000Base-LX/LH, 1310nm SMF, Up to 20km Dual LC Single-Mode Fiber SFP Module 0~70℃ : Electronics](https://m.media-amazon.com/images/I/71PrFRGPWWL.jpg)
Amazon.com: Centopto 2-Pack 1.25G SFP Optical Transceiver 1000Base-LX/LH, 1310nm SMF, Up to 20km Dual LC Single-Mode Fiber SFP Module 0~70℃ : Electronics
![SFP-7002-WA - Gigabit Ethernet BiDirectional single strand WDM SFP transceiver, Tx:1310nm/Rx:1550nm, type A, max range 2Km, single LC connector SFP-7002-WA - Gigabit Ethernet BiDirectional single strand WDM SFP transceiver, Tx:1310nm/Rx:1550nm, type A, max range 2Km, single LC connector](https://cdn11.bigcommerce.com/s-km6dyefd/images/stencil/1280x1280/products/237/426/SFP_7002_WA__73479.1423165535.jpg?c=2)