What is the difference between optical transceiver/optical switch/Ethernet optical transceiver/HD network optical transceiver/network optical transceiver?

There are some terms related to fiber optic equipment on the market:
Fiber optic transceiver/fiber switch/Ethernet optical transceiver/HD network optical transceiver/Network optical transceiver
What are the differences between the above devices?
 In fact, the names above are all the same type of product, and different people have different names. After all, they are all the same, just like the fruit that can be used as a vegetable. Some people call it tomatoes and some people call it tomatoes. They all talk about the same thing. , But why are there so many different names?
The above are all equipment that converts network to optical fiber. Different opinions have some historical reasons for this:
Fiber Transceiver:
This is the earliest name in the telecommunications industry for equipment that converts a single or multiple electrical ports into an optical port network. This term has been around since the 1990s, when there was no such thing as "Ethernet Optical Multiplexer";
Fiber optic switch:
Switch, the term started from telephone switch, there were two kinds of analog switch and digital switch at the earliest, referring to the product made by Huawei. Later, the network is from the HUB hub (data is crossed together, and the devices on the HUB share the same bandwidth) It has developed to a switching function similar to that of a telephone switch, so with the term "Ethernet switch", the network medium will extend from cable to fiber optic media in the future, and there will be the concept of fiber switch, which generally refers to multiple optical ports and multiple electrical ports. Ethernet switch, the term has been around since the 1990s;
Ethernet optical transceiver/HD network optical transceiver/network optical transceiver:
The above concepts should start with the optical transceiver. The earliest statement of the optical transceiver is from the PDH optical transceiver and the SDH optical transceiver, which is used for fiber-optic telephony services (the smallest particle E1/T1/J1, etc.). The SDH optical transceiver is still the backbone. Wide area transmission network; Later, there was the analog video (CVBS signal) transmission service, which was mainly used in the security industry. It also inherited the term of optical transceiver, called video optical transceiver. At that time, it was divided into analog video based on the encoding method of video in optical fiber. There are two types of video optical transceivers and digital video optical transceivers. Later, from around 2010, the beginning of IP video coding, analog cameras were gradually replaced by IPC network video, so the term optical transceiver was used instead of optical transceivers that transmit IPC video signals. It is called Ethernet optical transceiver or network optical transceiver, and then IPC is developing in the direction of high definition, so there is a high-definition network optical transceiver. The above three statements are generally concentrated in the security industry;

POE Network Terminal with Amplifier is your good choice.