Multi-Components Interferometer Based on Partially Filled Dual-Core Photonic Crystal Fiber for Temperature and Strain Sensing

Abstract

A multi-components interferometer based on partially filling dual-core photonic crystal fiber (D-C PCF) was fabricated for measuring temperature and strain. The partially filled D-C PCF was prepared by manual glue method, and the cladding air holes surrounding one core were selective filled with refractive index liquid while remaining other air holes unfilled. A multi-components interference with a large spectrum envelope and fine interference fringes was observed in the transmission spectrum. Theoretical and experimental investigations revealed that the large spectrum envelope was originated by the interference of the fundamental modes of two cores of the PCF while the fine interference fringes were generated by the interference between the fundamental mode and higher order modes in one core that surrounded by unfilled air holes. The proposed device can be used to monitor temperature and strain simultaneously through matrix demodulation, with a high temperature sensitivity of 5.43 nm/ • C.

Ultrafast Mid-IR Laser Pulses Generation via Chirp Manipulated Optical Parametric Amplification

“…The low requirement on a multi-plate scheme allows BBP generation with a wide variety of initial laser energy of only several tens to hundreds µJ. With the reported conversion efficiency, µJ-level few-cycle Mid-IR pulses can be directly obtained from a single-stage BBP-OPA pumped by a laser system with moderate pulse energy, which can benefit applications that do not require the ultrahigh energy of femtosecond laser pulses [115][116][117][118][119].…”

Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

“…To solve the cross-sensitivity issue of single-parameter sensing, multi-parameter fiber sensors have attracted the attention of many researchers. Recently, various sensing structures have been reported to achieve the simultaneous measurement of strain and temperature, such as: fiber Bragg gratings (FBGs) [5], long period gratings fabricated by CO 2 laser [6], FBGs combined with four-core fiber [7], various fiber in-line Mach-Zehnder interferometers (MZIs) based on multimode fiber (MMF) [8] or plastic optical fiber [9], photonic crystal fiber (PCF) [10] or few-mode fiber [11], cascaded dual-pass MZIs with Sagnac interferometers [12], partially filled dual-core PCF [13] or selectively infiltrated PCF [14], dual-core As 2 Se 3 -PMMA (polymethyl methacrylate) tapers [15], and other structures [16,17,18,19]. Among them, fiber in-line MZIs have aroused great interest owing to their advantages of small size, simplicity of fabrication, and high sensitivity.…”

“…This method enhanced the complexity of fabrication and reduced the mechanical strength of the device. In 2016, Hou et al [13] presented a multi-component interferometer based on partially filled dual-core PCF for the simultaneous measurement of strain and temperature. The sensor showed a temperature sensitivity as high as 5.43 nm/°C.…”

Microfiber Bragg grating for temperature and strain sensing applications

“…These distinctive features have been exploited in a wealth of applications ranging from telecommunication devices to sensors [2,3], and from optical manipulation to high Q resonators. Fiber sensors, based on the various fiber components, have been developed in many forms [4][5][6][7][8][9], and are exhibiting outstanding performances in the field of physical and bio-chemical sensing. Fiber Bragg grating (FBG) is among the most important optical components which has a wide variation of applications [10][11][12][13].…”