Design of High Stability Local Oscillator Source for Microwave Communication
Opto-electronic oscillator(OEO)is a device for converting electrical energy(DC-AC).Compared with traditional electrical microwave sources,OEO has lower phase noise and is therefore widely used in the system design of microwave communication engineering.This paper proposes a highly stable local oscillator control scheme to address the issue of unstable amplitude in traditional OEO devices.Firstly,a feedback loop is used to control the working intensity of the electro-optic modulation device.Subsequently,pilot technology is used to further control the stability of the oscillation loop,and a low-frequency signal is introduced into the microwave optical link to obtain phase information difference.Finally,transmit it back to the OEO loop.Experimental results have shown that the designed highly stable local oscillator scheme has stable signal transmission characteristics,and the Allan variance can be controlled at 2.7×10-12 per second.
NETL
NSTL
万方数据
