Pico-strain resolution fiber-optic sensor with white-light interferometry

• DOI: 10.1364/ol.456466
• Publication Date: 2022-03-30T19:30:09Z
• Authors: Shuting Liu; Qingwen Liu; Shuangxiang Zhao; Zuyuan He
• Keywords: White light interferometry; Fiber Bragg Grating

The fiber Bragg grating (FBG) sensor is well known for simple fabrication, absolute measurement, inherent multiplexing capability, etc. To date, most FBG sensors that use a broadband light source demodulation can only achieve resolution at the µɛ level. In this Letter, we propose white-light-driven self-reference sensing system with FBGs, using Mach-Zehnder interferometer (MZI) and white source, to realize multiplexed high-resolution vibration very configuration. A strain of 35pε/Hz 1 kHz demonstrated, which several orders magnitude better than current systems sources. performance analyzed, capability also experimentally evaluated; there no observable cross talk.