Sizhe Zhang, Qingwen Liu, Shuting Liu, Binglin Chen, Zuyuan He
{"title":"Modulation-free broadband fiber optic current sensor based on a linear resonant cavity.","authors":"Sizhe Zhang, Qingwen Liu, Shuting Liu, Binglin Chen, Zuyuan He","doi":"10.1364/OL.575435","DOIUrl":null,"url":null,"abstract":"<p><p>A modulation-free, low-cost fiber optic current sensor based on a broadband source and a single-mode linear resonant cavity is presented. The Faraday effect of the current under test results in a phase difference between the two beams with orthogonal circular polarization states. The out-cavity beams propagating in different circles continuously superimpose and are demodulated together. The utilization of a 3×3 coupler and balanced photodetector enables the acquisition of current information without active modulation. In the direct current measurement, a sensitivity of 1.749 mV/A and a mean relative error below 0.2% within 0-200 A are achieved. The sensor exhibits a good capability for detecting the alternating current. In addition, the short-term and long-term noise performance of this system is analyzed.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 19","pages":"6229-6232"},"PeriodicalIF":3.3000,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.575435","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
A modulation-free, low-cost fiber optic current sensor based on a broadband source and a single-mode linear resonant cavity is presented. The Faraday effect of the current under test results in a phase difference between the two beams with orthogonal circular polarization states. The out-cavity beams propagating in different circles continuously superimpose and are demodulated together. The utilization of a 3×3 coupler and balanced photodetector enables the acquisition of current information without active modulation. In the direct current measurement, a sensitivity of 1.749 mV/A and a mean relative error below 0.2% within 0-200 A are achieved. The sensor exhibits a good capability for detecting the alternating current. In addition, the short-term and long-term noise performance of this system is analyzed.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
