Highly sensitive strain and bending sensor based on in-line fiber Mach–Zehnder interferometer in solid core large mode area photonic crystal fiber
Citation
Shin, W., Lee, Y. L., Yu, B.-A., Noh, Y.-C., & Ahn, T. J. (2010). Highly sensitive strain and bending sensor based on in-line fiber Mach–Zehnder interferometer in solid core large mode area photonic crystal fiber. Optics Communications, 283(10), 2097–2101. https://doi.org/10.1016/j.optcom.2010.01.008
Keywords
- Strain sensor
- Bending sensor
- High sensitivity
- Low temperature sensitivity
- In-line Mach-Zehnder interferometer (MZI)
- Solid core large mode area photonic crystal fiber (PCF)
- Cladding-mode resonance
- Long period fiber grating (LPFG)
- CO2 laser writing method
- Phase matching condition
- Effective refractive index (neff)
- Grating period (K)
- Mode coupling
- Transmission spectrum
- Resonant wavelength (λres)
- Insertion loss
- Attenuation band
- Interference fringes
Brief
This article presents a highly sensitive strain and bending sensor with low temperature dependency achieved through a simple in-line Mach-Zehnder interferometer (MZI) fabricated in a solid core large mode area photonic crystal fiber (PCF) using CO2 laser writing.
Summary
This article presents a highly sensitive and cost-effective strain and bending sensor fabricated using a simple in-line Mach-Zehnder interferometer (MZI) in a solid core large mode area photonic crystal fiber (PCF) with CO2 laser writing. The sensor exhibits measured strain sensitivities of approximately -3 pm/µε and bending sensitivities of 3.05 nm/m (for lower curvature) and 36.16 nm/m (for higher curvature). Notably, the proposed PCF-MZI demonstrates a very low temperature sensitivity of about 4.6 pm/°C, which is a significant advantage over traditional LPFG-based sensors that are more susceptible to temperature variations. The simple fabrication process and low temperature dependency make this device a promising candidate for various optical sensing applications.
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