EXTRALINK SFP+ 10G WDM 1270/1330NM SM 20KM - PAIR (EL-SFP+SM-20KM-PR) - The source for WiFi products at best prices in Europe - wifi-stock.com
SFP 1 Gbps SM LC 1310/1550(TX/RX) 20 km range MSA Standard - Fiber Instrument Sales
EXTRALINK SFP module 1.25G 1310NM 20KM SM DDM(EL-SFP-SM-1G) - The source for WiFi products at best prices in Europe - wifi-stock.com
Amazon.com: TRENDnet SFP Single Mode LC Module (20km/ 12.4 mi), TEG-MGBS20, Data Rates up to 1.25Gbps, 1310nm Single Mode, IEEE 802.3z Gigabit Ethernet, ANSI Fiber Channel Compliant, Lifetime Protection : Electronics
MFB-F20 Single Mode, 100Mbps SFP Fiber Transceiver - 20KM - Planet Technology USA
12g Video Bidi Sfp Module With Sdi Function 10/20km,12g Sm 1270/1310nm 10km 20km Bi-directional Sdi Sfp Video Transceiver - Fiber Optic Equipment - AliExpress
FS 1000BASE-LX/LH SFP 1310nm 20km Transceiver - FS.com Europe