Control of the characteristics of a long-period grating by cladding etching
- 1 May 2000
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 39 (13) , 2038-2042
- https://doi.org/10.1364/ao.39.002038
Abstract
We have analyzed the effects of the fiber cladding radius on the characteristics of long-period fiber gratings. By etching the cladding of a common single-mode fiber, we verified the characteristics experimentally. When by etching we reduce the cladding radius of a common single-mode fiber on which a long-period refractive-index modulation has been imposed, the coupling strength of the core and the cladding modes increases. In addition, the difference in the propagation constants (for a fixed wavelength) between the core mode and the cladding modes increases; hence the resonant transmission dip wavelengths shift to longer wavelengths. The proposed method can be useful in making and detuning long-period fiber grating filters.Keywords
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