The optical cat is the "optical modem", which refers to the transceiver device that converts the optical Ethernet signal into other protocol signals, and also plays the role of modulation and demodulation. The optical cat is also called a single-port optical transceiver. This device serves as a relay transmission device for the local network, and is suitable for optical fiber terminal transmission equipment of base stations and leased line equipment. For multi-port optical transceivers, they are generally called "optical transceivers". For single-port optical transceivers, they are generally used at the user end. They work similarly to the baseband modems commonly used in WAN dedicated line (circuit) networking, and are called "optical modems." "Optical cat", "optical modem". 
Light cat's working principle Light cat's equipment uses large-scale integrated chips, simple circuit, low power consumption, high reliability, complete alarm status indication and perfect network management function.
The optical cat is a device similar to the baseband modem (digital modem). Unlike the baseband modem, the optical fiber dedicated line is connected to it, which is an optical signal. It is used for the conversion of photoelectric signals and the conversion of interface protocols in the wide area network. It is the access to the router through the access router. The photoelectric transceiver uses the photoelectric signal conversion in the local area network, but only the signal conversion, and there is no interface protocol conversion. 
The scope of application of optical cats only talks about Ethernet optical cats, which are mainly used when the distance exceeds 20KM. In the middle, it needs to be transferred through optical transmission equipment such as SDH / PDH.
In general, the speed of the optical cat is packaged on a 2M circuit, so the difference of the optical transceiver of the optical cat is also its speed. The optical cat is 2M and the optical transceiver is 100M.
General application scenarios:
Customer-Ethernet optical cat-optical cable-E1 optical cat-2M cable-central office SDH optical transceiver-another office SDH optical transceiver-PDH optical transceiver-E1 to Ethernet protocol conversion-customer equipment (Ethernet switch or computer, etc.).
Of course, there are V.35 optical cat, V.24 optical cat, RS-232 optical cat and so on. The application is similar to the above.
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