Erbium-doped fiber ring laser based on few-mode-singlemode-few-mode fiber structure for refractive index measurement. (1st August 2017)

• Record Type: Journal Article
• Authors: Liu, Jingxuan; Wang, Muguang; Liang, Xiao; Dong, Yue; Xiao, Han; Jian, Shuisheng
• Is Part Of: Optics & laser technology. Volume 93(2017)
• Page Start: 74
• Page End: 78
• Publication Date: 2017-08-01
• Subjects: Few-mode -- Concentric ring core fiber -- Fiber laser sensor -- Refractive index measurement; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2017.02.008
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: A novel fiber ring cavity laser for RI measurement is proposed. The sensor is based on FSF structure using few-mode concentric-ring core fiber. We demonstrated LP01 and LP11 are two dominated propagating modes in CRCF. The sensing system has high OSNR (∼45 dB) and narrow 3 dB bandwidth (∼0.1 nm). The sensor has an experimentally RI sensitivity of −45.429 nm/RIU. Abstract: A novel Erbium-doped fiber ring cavity laser sensor for refractive index (RI) measurement based on a special designed few-mode-singlemode-few-mode structure is proposed and experimentally demonstrated. The few-mode fiber is a home-made concentric ring core fiber (CRCF) which can only support two scalar modes. Thus a stable mode interference occurs which functions as a sensing head and band-pass filter to select the lasing wavelength simultaneously. A sensitivity of −45.429 nm/RIU is obtained in the range of 1.333–1.363. High optical signal to noise ratio (OSNR) of ∼45 dB and narrow 3-dB bandwidth of ∼0.1 nm indicate that the fiber ring laser sensing system has a high resolution and accuracy RI measurement.