An opto‐electronic oscillator based on Fabry‐Perot stabilized dual‐wavelength fiber ring laser

Abstract

The authors experimentally demonstrate an optoelectronic oscillator based on a dual-wavelength fiber ring laser with an inline specially designed fiber-Bragg-grating-based Fabry-Perot filter. An erbiumdoped fiber amplifier initiates the process as a broadband light source while a second optical amplifier provides additional gain to increase the cavity power. By exploiting the two-wavelength beating, a 10.3 GHz microwave carrier with 3-dB linewidth of <200 Hz was generated with 77 dB signal-to-noise ratio. Phase noise of À100 dBc/Hz @10 kHz offset is achieved, which is very appropriate for microwave applications in X-band that often require high extinction ratio and low phase noise.