The transmit (TX) side of an optical module is responsible for sending data over an optical fiber. Electrical signals from the host device enter the module and are processed by internal driver circuits. These circuits then drive a laser diode (LD) or light-emitting diode (LED), which emits modulated light corresponding to the original electrical signal. This optical signal is then sent through the module's optical interface into the fiber for transmission to a remote device . The transmit function ensures that digital data can travel long distances with minimal loss and high speed.
The receive (RX) side handles incoming optical signals from the fiber. The optical signal enters the module and is detected by a photodetector, typically a photodiode, which converts the light back into an electrical signal. This electrical signal is then amplified and processed by the module's receiver circuitry before being sent to the host device . The receive function allows the system to interpret the transmitted data accurately.
The transmit and receive functions are fundamental to optical modules, enabling bidirectional communication over fiber optic networks. The transmit side converts electrical signals to light for sending, while the receive side converts incoming light back to electrical signals for processing, forming the core of optical transceiver operation .
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