GUO Shi-liang,LI Xin,XUE Han.Spectral characteristics of microfiber nested ring with knot resonator[J].Optoelectronics Letters,2020,16(3):185-189 Spectral characteristics of microfiber nested ring with knot resonator Author Name Affiliation GUO Shi-liang  Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China  LI Xin  Control and Simulation Centre, Harbin Institute of Technology, Harbin 150080, China  XUE Han  Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China  Abstract:       A novel microfiber nested ring with knot resonator (MNRKR) is proposed and demonstrated. A mathematical model to describe the principle of the tunable feature of MNRKR is illustrated. The improvement of the output spectra is achieved by changing the transmission coefficient and the length of the feedback waveguide. We theoretically and experimentally demonstrate that the free spectral range (FSR) can be doubled by constructive interference without reducing the circumference of microring. Thus, this all-fiber optical device has the potential for achieving a large measuring range of the optical sensor. Hits: 1020 Download times: 0 View Full Text    Download reader