title: Control of the characteristics of a long-period grating by cladding etching.
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.
authors.forename: S
authors.initials: S
authors.lastname: Kim
authors.forename: Y
authors.initials: Y
authors.lastname: Jeong
authors.forename: S
authors.initials: S
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Kwon
authors.forename: N
authors.initials: N
authors.lastname: Park
authors.forename: B
authors.initials: B
authors.lastname: Lee