Effects of the biasing voltage of modulator on the phase noise of opto‐electronic oscillator

Low biasing technique has been used recently to reduce the relative intensity noise of the microwave optical fiber links.In this article, the possibility of reducing the phase noise of opto-electronic oscillator (OEO) by using low-biased optical fiber link is verified. Theoretical and experimental results show that the single sideband (SSB) phase noise of OEO can be reduced at the maximum by 2.8 dB in low-biased microwave optical fiber links when compared with conventional quadrature-biased links. The optimal biasing angle corresponding to the minimum SSB phase noise increases with the intensity of the optical power into modulator. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:689–692, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26642