Wideband tunable up-converting optoelectronic oscillator based on gain-loss compensation technology and stimulated Brillouin scattering

摘要

An optically wideband tunable up-converting optoelectronic oscillator (OEO) based on stimulated Brillouin scattering and gain-loss compensation is demonstrated and theoretically analyzed. In the proposed structure, Brillouin narrowband filter technique is implemented by introducing two pump lights with the frequency interval twice the Brillouin frequency shift (v(b)). The overlapping of the gain and the loss spectrum is used to realize a wideband tunable OEO. As a consequence, the tunability of the wideband of the output microwave signal at fm+2vb from 22.4 to 61.4GHz can be realized by changing the signal under testing from 1 to 40GHz. In addition, the transfer function of the system is given and the single sideband (SSB) phase noise is also evaluated theoretically. And the theoretical simulated the SSB phase noise is -116.1dBc/Hz at the 10kHz offset when the f(m)=25GHz. Not only the OEO can convert a low-frequency IF signal to a high-frequency signal without introducing any high-Q electrical filter, but the frequency of the output signal is high enough and widely tunable. Because of the high frequency tunable capacity, the up-converting OEO might have a potential application in radar communication and millimeter wave generation systems.