Amazon.com: a Pair of 10G SFP+ Bidi Transceiver, 10GBase-BIDI 1270nm/1330nm SMF, up to 10-20 km, Compatible with Cisco SFP-10G-BXD-I/SFP-10G-BXU-I, Ubiquiti UniFi, Mikrotik, Netgear, D-Link and More : Electronics
Double Fiber CWDM 20 km SFP+ Optical Transceiver: CWDM-16GFC-SFP-20-57
UBIQUITI SM BiDi SFP+ Module 20-Pack (UF-SM-10G-S-20) - The source for WiFi products at best prices in Europe - wifi-stock.com
Customized 1000BASE-LX/LH SFP Transceiver for SMF 1.25G | GE Module(DOM, 1310nm, 20km) - HiFiber.com
Amazon.com: Single Mode LC Gigabit Fiber Media Converter - Includes LC SFP 20 km (12.42 Miles) LC – to UTP Cat5e Cat6 10/100/1000 RJ-45 – Auto Sensing Gigabit or Fast Ethernet Speed -
SFP 1G BiDi (WDM) 20km 1310/1550 DOM SC (1 pair) – Dimiks Store