There have been multiple variants of the electrical interface of optical modules that have been used over the years. Subsequently, the driver semiconductor laser (LD) or light-emitting diode (LED) emits modulated optical signals at the corresponding rate. The optical module, known as Optical Transceiver in English, is a general term for various module categories, including optical receiver modules, optical transmitter modules, optical transceiver modules, and optical forwarding modules. The optical module serves as a crucial component in optical fiber communication systems, operating at the physical layer, which is the lowest layer in the OSI model.
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