Highly sensitive temperature sensor based on multimode‐interference fiber structure with gel cladding. Issue 6 (18th February 2021)

• Record Type: Journal Article
• Authors: Sakata, Hajime; Okada, Kengo; Mochizuki, Jun
• Is Part Of: Microwave and optical technology letters. Volume 63:Issue 6(2021)
• Page Start: 1647
• Page End: 1651
• Publication Date: 2021-02-18
• Subjects: fiber‐optic sensors -- multimode interference effects -- temperature sensors; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.32823
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: We present a temperature‐sensitive, single‐mode–multimode–single‐mode (SMS) fiber structure with an index‐matching gel as a cladding material in a multimode segment. A silica core with the surrounding gel is supported straight by a thin glass tube to produce a bandpass transmission response. The passband wavelength shifts by 96 nm from 1624.5 to 1528.5 nm as the temperature increased from 40 to 200°C. The maximum sensitivity obtained is 2 nm/°C in the temperature range 40–70°C, whereas the minimum sensitivity is 0.13 nm/°C in the temperature range 125–200°C. The SMS fiber structure, including the gel cladding, allows high operating temperatures and high thermal sensitivities.