Amazon.com: a Pair of 10GBASE SFP+ Bidi Transceivers, 10GBase-BIDI 1270nm/1330nm SMF, up to 40km, for Juniper JNP-SFP-10G-BX40D/JNP-SFP-10G-BX40U : Electronics
Cisco SFP-10G-BX40D-I Compatible 10GBASE-BX40-D SFP+ 1330nm-TX/1270nm-RX 40km DOM Transceiver
SFP-10G-BX40D-I compatible Bi-Di SM 40km TX1330nm, RX1270nm SFP+ Tran
Cisco SFP-10G-BX40D-I LC to PC Single-Mode SFP+ Transceiver 10 Gbps - ServerSupply.com