Renuka, B.Shivaputra, A.Ramesh, S.Mandi, M.V.Meena, M.Singh, M.2026-02-032025Physica Scripta, 2025, 100, 6, pp. -318949https://doi.org/10.1088/1402-4896/add8efhttps://idr.nitk.ac.in/handle/123456789/20246We proposed an optoelectronic oscillator (OEO), incorporating a dual parallel Mach-Zehnder modulator (DP-MZM) and quadratic fiber Bragg grating (Q-FBG) for microwave photonic (MWP) applications. The suggested system combines the unique dispersive and reflective properties of the Q-FBG to achieve enhanced frequency stability and spectral purity. The Q-FBG facilitates precise control over the oscillation frequency by introducing quadratic phase modulation, effectively suppressing spurious modes and improving phase noise performance. Experimental results demonstrate the capability of the OEO-QFBG system to generate low-phase-noise microwave signals with superior stability compared to conventional OEO designs. A 20 GHz microwave signal with low phase noise of -134.93 dBc Hz?1 at 10 kHz offset was generated. This work underscores the potential of integrating advanced photonic components, such as Q-FBGs, for advanced microwave photonics applications, including radar systems, communications, and high-precision instrumentation. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.Amplitude shift keyingFrequency stabilityImage analysisImage intensifiers (solid state)Image sensorsLight modulationPhase modulationPhotoconducting devicesPhotoelectric cellsPhotonic integration technologyPhototubesQuadrature amplitude modulationFiber BraggLow-phase-noiseMach Zehnder modulatorMicrowave photonicMicrowave photonic applicationsMicrowave PhotonicsMicrowave signalsOptoelectronic oscillatorPhase-noisePhotonic signalsMicrowave photonics