Phase Noise Reduction in Optoelectronic Oscillator With Quadratic Fiber Bragg Grating Dispersion Engineering

This article presents the design, implementation, and performance analysis of an optoelectronic oscillator (OEO) incorporating a quadratic fiber Bragg grating (Q-FBG). Integrating Q-FBG in OEO architecture introduces enhanced filtering capabilities and precise frequency control, which are critical for applications requiring high stability and low phase noise. It provides a tailored reflection spectrum, enabling improved mode selection and reduced spurious tones. Experiments confirm oscillator’s superior performance metrics, including phase noise reduction and frequency stability. Theoretical modeling and simulation corroborate the experimental results, confirming the Q-FBG’s effectiveness in optimizing OEO performance. An error vector magnitude (EVM) of 2.5% is obtained for the generated signal, indicating high quality and improved modulation accuracy of the microwave signal. The uncertainty of measurement, particularly the standard deviation in EVM values, is analyzed to assess system reliability. The potential applications of the proposed OEO include telecommunications, radar systems, and precision measurement instruments. The study underscores the significant advantages of incorporating Q-FBG in OEOs and paves the way for further advancements in microwave photonics technology.