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Optoelectronic oscillators (OEOs) are hybrid RF-photonic oscillators that promise to be environmentally robust frequency sources with very low phase noise. Recent experiments have shown that the excess flicker phase noise in these systems grows with the length of the optical fiber loop. In this paper, we detail a mechanism for this length-dependent flicker noise in which Rayleigh-scattering-induced...
Optical fiber-length-dependent flicker phase noise has been identified as a major limit to the reduction of phase noise in opto-electronic oscillators (OEOs). We outline a systematic approach to model the optical path of the OEO, and investigate the sources of length-dependent phase noise in the optical path and how they are effected by the dispersion and Kerr nonlinearity of the optical fiber.
We discuss possible sources for the experimentally-observed length-dependent phase noise in opto-electronic oscillators. We eliminate several possibilities and show that conversion of laser amplitude noise to phase noise is a likely candidate.
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