Improved configuration and reduction of phase noise in a narrow linewidth ultrawideband optical RF source.
2014
In this Letter, we report on the improved configuration of a widely tunable optical RF generation system, particularly for the generation of low-frequency RF, as well as the reduction of phase noise in that same system. Using an amplitude modulator, a simplified system design was demonstrated with fewer components and improved phase noise performance, especially at RF frequencies below ∼36 GHz. Excess phase noise due to acoustic vibrations of the optical fibers was also successfully eliminated by mechanical isolation. A minimum phase noise of −124 dBc/Hz at 10 kHz offset was demonstrated at 4 GHz.
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