Sensitivity Characterization of Cascaded Long-Period Gratings Operating near the Phase-Matching Turning Point.

توصيف حساسية المحززات طويلة الدورة المتتالية العاملة بالقرب من نقطة تحول تطابق الطور.

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ID: 260969
2020
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Abstract
We characterized a cascaded long-period gratings (LPGs)-based sensor that was operating at the phase-matching turning point (PMTP). The cascaded LPGs constructed an in-fiber Mach-Zehnder interferometer (MZI), which exhibited a series of high-quality-factor () narrow-bandwidth resonance peaks. As the LPG operated at the PMTP, the proposed sensor showed an ultrahigh refractive index (RI) and temperature sensitivity, and high measurement precision. In this study, we took an in-depth look at the effects of grating separation on Q-factor and sensitivity. The results showed that the sensitivity to the surrounding refractive index (SRI) reached 4741.5 nm/RIU at 1.4255 and 2138 nm/RIU, over the range of 1.335-1.373. In addition, the temperature sensitivity was around 4.84 nm/°C. With a 0.02 nm wavelength resolution, the RI and temperature sensing limits were 9.3 × 10 RIU and 5.5 × 10 °C.
قمنا بتوصيف مستشعر قائم على محزوزات طويلة الدورة (LPGs) متعاقبة يعمل عند نقطة تحول مطابقة الطور (PMTP). وشكّلت محزوزات LPG المتعاقبة مقياس تداخل ماخ-زيندر (MZI) داخل الليف، والذي أظهر سلسلة من قمم الرنين ضيقة النطاق الترددي وذات عامل جودة مرتفع (). وبفضل عمل محزوز LPG عند نقطة PMTP، أظهر المستشعر المقترح حساسية فائقة لمعامل الانكسار (RI) ودرجة الحرارة، فضلاً عن دقة قياس عالية. وفي هذه الدراسة، تناولنا بعمق تأثيرات التباعد بين المحزوزات على عامل الجودة (Q-factor) والحساسية. وأظهرت النتائج أن الحساسية لمعامل انكسار الوسط المحيط (SRI) بلغت 4741.5 nm/RIU عند 1.4255، و2138 nm/RIU على المدى 1.335–1.373. بالإضافة إلى ذلك، بلغت حساسية درجة الحرارة قرابة 4.84 nm/°C. ومع ميز في الطول الموجي قدره 0.02 nm، بلغت حدود استشعار معامل الانكسار ودرجة الحرارة 9.3 × 10 RIU و5.5 × 10 °C.
Reference Key
zhou2020sensitivitysensors Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhou, Wei;Ran, Yanli;Yan, Zhijun;Sun, Qizhen;Liu, Chen;Liu, Deming;
Journal sensors
Year 2020
DOI
E5978
URL
Keywords
quality factor optical fiber sensors long period fiber grating phase-matching turning point

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