Original Cisco SFP-10G-ER SFP+ 10Gb 1550nm 40kmTransceiver 10-2531-02 COUIA76CAA
Amazon.com: 10GBase-ER SFP+ Transceiver, 10G 1550nm SMF, up to 40 km, Compatible with Cisco SFP-10G-ER, Meraki, Ubiquiti UniFi, Mikrotik, Netgear, D-Link, Supermicro, TP-Link, Broadcom, Linksys and More. : Electronics
Alcatel-Lucent SFP-10G-ER Compatible 10GBASE-ER SFP+ 1550nm 40km DOM Transceiver