GLC-BX-U70 Cisco 1Gbps 1000BASE-BX10-U Upstream Bidirectional Single Fiber with DOM SFP Transceiver
Amazon.com: 10Gtek a Pair of 1.25G SFP Bidi Transceiver, 1000Base-BIDI SingleMode Simplex LC Fiber Module for Cisco GLC-BX-D, Ubiquiti UniFi UF-SM-1G-S, Mikrotik and More, SMF 1490nm/1310nm, DDM, up to 20 km :