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QSFP 40G LR4 optical module is widely used in 40G network, it includes two types of QSFP 40G LR4 CWDM optical module and QSFP 40G LR4 PSM optical module. What are CWDM and PSM? CWDM (Coarse Wavelength Division Multiplexing) refers to coarse wavelength division multiplexing. CWDM is a kind of WDM (wavelength division multiplexing). It can send and receive signals on multiple channels on a single optical fiber. It is usually used in communication networks. point-to-point structured wiring. PSM (Parallel Single Mode Fiber) refers to parallel single-mode fiber technology. Unlike CWDM optical modules that transmit or receive signals on multiple channels on a single fiber, PSM can simultaneously receive and send signals on four parallel fibers. Overview of QSFP 40G LR4 CWDM Optical Transceiver QSFP 40G LR4 CWDM module usually refers to QSFP+ 40G LR4 optical module, which has LC duplex interface, four independent transceiver channels, and each channel supports a rate of 10Gbps. In order to m