Adjustable Coupled Optoelectronic Oscillator Based on Double Frequency Output

Abstract

At present, the research and development of high-speed communication technology and the more detailed division of communication frequency band have become the hot spots all over the world, which also puts forward a greater technical challenge to the down-conversion system in the receiver. However, the key to the signal receiving performance of down-conversion system is the local vibration performance. Low phase noise, tunable wideband and strong anti-electromagnetic interference have become the new directions for the future research on oscillator. Compared with the traditional microwave local oscillator, the technical advantage of the optoelectronic oscillator is more obvious, and more research and development space is left for the development of the new frequency band of communication technology in the future. The tunable coupling optoelectronic oscillator based on the double frequency output designed in this paper uses the equivalent light source of the ring path to replace the laser, and the wavelength interval of the output spectrum is changed by adjusting the length difference of the optical fiber cavity of the ring path filter. At the same time, by adjusting the bias voltage of the double-output intensity modulator, the oscillator suppresses the fundamental frequency signal and achieves the output of the two-frequency signal. After the test, it can be known that when the optical carrier wavelength of the oscillator is 1551 nm, the tuning range of the output fundamental frequency is 1.8–9 GHZ; The output range of double frequency is 3.6–18 GHz, the output power is greater than 10 dBm, and the phase noise changes slightly at different output frequencies, which is about –102 dBc/Hz.