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<p>An optoelectronic oscillator (OEO) integrating a Microfiber Coupler Sagnac loop and a parallel optical amplifier is proposed for the generation of wide-range, stable microwave signals. Unlike conventional OEOs that rely on dual-loop configurations, fixed optical delay lines, or bulky and lossy external filters, our design offers a solution capable of generating RF signals over a broad frequency range of 5–20&#xa0;GHz. Sagnac loop provides high-resolution spectral filtering and substantial side-mode suppression, while the parallel optical amplifier enhances the loop gain and facilitates the stable oscillation across the entire tuning bandwidth. Our results confirm multi-tone microwave signal&#xa0;generation with a side-mode suppression ratio exceeding 50&#xa0;dB. The single sideband phase noise of about − 125 dBc/Hz at 10&#xa0;kHz offset frequency is achieved for 10&#xa0;GHz oscillation frequency. This hybrid architecture leads to highly stable, tunable, and pure microwave signal generation, making it suitable for radar systems, high-speed communication, and advanced sensing applications.</p>

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Widely-tunable optoelectronic oscillator using a microfiber coupler Sagnac loop

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Kajal Shiv Raj Meena,
  • Thayaba Nausheen A,
  • Mandeep Singh

摘要

An optoelectronic oscillator (OEO) integrating a Microfiber Coupler Sagnac loop and a parallel optical amplifier is proposed for the generation of wide-range, stable microwave signals. Unlike conventional OEOs that rely on dual-loop configurations, fixed optical delay lines, or bulky and lossy external filters, our design offers a solution capable of generating RF signals over a broad frequency range of 5–20 GHz. Sagnac loop provides high-resolution spectral filtering and substantial side-mode suppression, while the parallel optical amplifier enhances the loop gain and facilitates the stable oscillation across the entire tuning bandwidth. Our results confirm multi-tone microwave signal generation with a side-mode suppression ratio exceeding 50 dB. The single sideband phase noise of about − 125 dBc/Hz at 10 kHz offset frequency is achieved for 10 GHz oscillation frequency. This hybrid architecture leads to highly stable, tunable, and pure microwave signal generation, making it suitable for radar systems, high-speed communication, and advanced sensing applications.