Premium
Compact and high sensitivity low‐temperature sensor based on coreless silica fiber Mach‐Zehnder interferometer
Author(s) -
Baharin N. F.,
Musa S. M. A.,
Azmi A. I.,
Razak M. A. A.,
Abdullah A. S.,
Salim M. R.,
Mohd Noor M. Y.
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31269
Subject(s) - interferometry , mach–zehnder interferometer , offset (computer science) , materials science , optics , sensitivity (control systems) , temperature measurement , fiber optic sensor , optical fiber , wavelength , refractive index , fusion splicing , interference (communication) , optoelectronics , physics , electronic engineering , engineering , telecommunications , channel (broadcasting) , quantum mechanics , computer science , programming language
An all‐fiber Mach‐Zehnder interferometer based on symmetrical offset coreless silica fiber (CSF) is proposed and demonstrated for temperature sensing. The sensor is constructed by a symmetrical offset splicing of a short CSF section between two CSF sections. Thus, two distinct optical paths are created inside and outside of the offset section resembling a Mach‐Zehnder interferometer. For temperature sensing, the offset gap is filled with refractive index liquid with high thermo‐optic coefficient of 3.34 × 10 −4 . Measurement is established by monitoring wavelength shift resulting from interference of modes between the two distinct optical paths. A very high temperature sensitivity of 3220 pm/°C has been achieved with a short sensor length of 1.5 mm. Due to its compact size and high sensitivity, the proposed structure would be an attractive option for low temperature measurement such as for human body temperature monitoring.