In Common: optical transceiver with a duplex LC connector interface for short-reach data communication and interconnect applications using MultiMode Fiber (MMF). With a transmitted distance of up to 100m by OM3 and 150m by OM4 Different: SR Bidi is two optical lanes over a 2-fiber duplex LC optical multi-mode fiber. The Cisco QSFP -00G-SR1.2 BiDi operates 50Gb PAM4 channels, for a total aggregate bandwidth of 100Gb. PAM4 technology enables 50Gb data rate with signaling at 25Gbaud rates. For QSFP-40G-SR-BD consists of two 20-Gbps transmit and receive channels in the 832-918 nanometer wavelength range. Popular Cisco models are: QSFP-40G-SR-BD; QSFP-40/100-SRBD; QSFP-100G-SR1.2 SWDM4 transceiver multiplexes four wavelengths on each simplex fiber, for 40G is 10G per wavelength, 4x10G. For 100G is 4x25G. SWDM4 can’t connect with SR Bidi to use, as channel and wavelength different. But this two bring same benefit for end customer, which enables reuse of existing 10 gigabit or 25G duplex MMF infrastructure for migration to 40 Gigabit or 100G Ethernet connectivity.