Highly cascaded first-order fiber Bragg gratings in highly multimode optical fibers for distributed temperature sensing under harsh environment conditions

Conference · Fri Jun 07 00:00:00 EDT 2024 · Proc. SPIE 13044, Optical Waveguide and Laser Sensors III

DOI:https://doi.org/10.1117/12.3013985· OSTI ID:2572509

Mumtaz, Farhan ^[1]; Tekle, Hanok ^[1]; Zhang, Bohong ^[1]; Smith, Jeffrey D. ^[1]; O'Malley, Ronald J. ^[1]; Gerald, II, Rex E. ^[1]; Huang, Jie ^[1]

---

1. Missouri University of Science and Technology, Rolla, MO (United States)

This study presents a pioneering technique for fabricating highly cascaded first-order fiber Bragg gratings (FBGs) using a femtosecond laser-assisted point-by-point inscription method in highly multimode optical fibers, specifically Sapphire crystalline fiber, and pure silica coreless fiber. Notably, it marks the first successful demonstration of a distributed array comprising 10 FBGs within highly multimode fibers. This achievement is facilitated by a high-power laser technique that yields larger reflectors characterized by a Gaussian intensity profile. These first-order FBGs offer various advantages, including enhanced reflectivity, reduced fabrication time, and simplified spectral characteristics, enhancing their accessibility for interpretation when contrasted with higher-order FBGs. In addition to that it encompasses a comprehensive analysis of the robustness and efficacy of these FBGs, with particular emphasis on their ability to endure extreme temperatures. These FBGs demonstrate an advantageous capability for localized multi-point temperature monitoring, reaching temperatures up to 1500°C with sapphire crystalline fiber and 1100°C with pure silica coreless fiber. This resilience makes them suitable for deployment in harsh environmental conditions. This innovative approach substantially broadens the potential applications of highly multimode optical fibers, particularly in the arena of sensing and communication, where challenges related to thermal gradients and harsh environments prevail. Furthermore, these groundbreaking first-order FBGs signify a substantial advancement in the realm of distributed temperature sensing, offering supreme capabilities for temperature monitoring and signal stability. As such, our work holds the promise of a substantial impact on industries and applications that demand unwavering reliability under extreme conditions.

• Research Organization: Missouri University of Science and Technology, Rolla, MO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)
• DOE Contract Number: EE0009119
• OSTI ID: 2572509
• Resource Type: Conference paper
• Conference Information: Journal Name: Proc. SPIE 13044, Optical Waveguide and Laser Sensors III
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
Coreless fiber
distributed thermal mapping
first order FBG array
harsh environment
sapphire crystalline fiber
Sapphire FBG High Temperature