Based on the Transmit and Receive specifications (from data sheet - below):
Tx Max = 0.5dBm
Rx Max = 0.5dBm
Any fiber length (= loss) between the transmit side and the receive side will guarantee the optical power at the receiver input will never be greater than the receiver's max input (Rx Max). So a short distance link will work using the SFP-10G-BXD-I to SFP-10G-BXU-I (need to be used in pairs).
Tx Tx Rx Rx
Max Min Max Min
Cisco SFP-10G-BXD-I | 10G-SFP Bidirectional for 10km | 0.5 | -8.2 | 0.5 | -14.4 | 1320 to 1340 (Tx) 1260 to 1280 (Rx) |
Cisco SFP-10G-BXU-I | 10G-SFP Bidirectional for 10km | 0.5 | -8.2 | 0.5 | -14.4 | 1260 to 1280 (Tx) 1320 to 1340 (Rx) |