射频能量滤波分相单元，是将合路平台输出的无线电信号（下行信号）通过同轴衰减器及滤波装置进行信号衰减滤波处理后输入近端光端机，使得近端光端机输入信号功率较小，保护设备提升设备使用寿命，对讲机发射电磁波后（上行信号）同样也是由射频能量滤波分相单元通过滤波装置将驻波、及底噪过滤后输入至系统中继台。

The near-end optical transceiver converts the voice and data signals to be transmitted into photoelectric conversion, and then multiplexes these digital signals to convert multiple low-speed digital signals into a high-speed signal, and converts this signal into an optical signal. At the receiving end, the optical signals are converted into electrical signals, and finally these data signals are restored into voice and data signals.

射频能量滤波分相单元是光纤直放站近端机前级耦合信号的专用产品，是将多个光纤射频近端设备中的上行信号，集成一路，送往接收机的多路耦合设备组件。

The input signal of an optical transmitter (near-end unit) is a radio frequency (RF) signal. At the front end, the RF signal is sent to the optical transmitter input for electronically controlled attenuation, predistortion compensation and automatic power level control, and then the laser chip is driven for RF/optical modulation, and the RF signal is converted into an optical modulation signal.