Abstract
We report the spectral characteristics of CO2-laser inscribed long-period gratings (LPGs) in endlessly single mode photonic crystal fiber (PCF) subject to macro-bending. The coupling modes as a result of bending were studied by examining the shifts of resonant wavelengths, the splits of attenuation bands, and the variation in coupling strength of the transmission spectra. A bending coefficient of ∼ 27.9 nm·m was determined in the PCF at 180° rotational orientation relative to the point of laser inscription in the curvature range from 2.6 m-1 to 3.5 m -1. Compared with conventional fiber LPGs fabricated using the same method, the PCF-based LPGs possess higher sensitivity both to bending and orientation, making them promising for sensor applications.
Original language | English |
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Pages (from-to) | 1804-1810 |
Number of pages | 7 |
Journal | Optics Express |
Volume | 15 |
Issue number | 4 |
DOIs | |
State | Published - 19 Feb 2007 |