BIDI SFP is a bidirectional optical module, also called WDM module. It uses WDM technology to realize the bidirectional transmission of optical signals on one optical fiber.

2. Appearance

3. Wavelength
Gigabit BiDi：TX1310/RX1550nm，TX1550/RX1310nm，TX1310/RX1490nm，TX1490/RX1310nm，TX1490/RX1550nm，TX1550/RX1490nm
10Gigabit BiDi：TX1270/RX1330nm，TX1330/RX1270nm

4. Transmitting distance
The longest distance of Gigabit BiDi is up to 120KM, while 10Gigabit BiDi is 80KM.

5. The requirements of application on the switch
The switch port for Gigabit BiDi is SFP port, for 10Gigabit BiDi is SFP+ port.

Above are the differences between the Gigabit BiDi module and 10Gigabit BiDi module, If you want to know more relevant knowledge of optical modules, welcome to click below link:
http://www.etulinktechnology.com/10G-SFP-_c11_2, you will learn more product knowledge.