Rof-ROFBox Series Analog broadband external modulation optical transceiver module using external modulation mode, can provide RF signal optical transmission in the frequency range of 1-40 GHZ, providing superior performance of linear fiber communication for a variety of analog broadband microwave applications. By avoiding the use of expensive coaxial cables or waveguides, the transmission distance limit is eliminated, greatly improving the signal quality and reliability of microwave communication, and can be widely used in remote wireless, timing and reference signal distribution, telemetry and delay lines and other microwave.