Optical fiber gratings with azimuthal refractive index perturbation and devices for tuning, attenuating, switching, and modulating optical signals,申请号US20040886800-传众专利搜索

Optical fiber gratings with azimuthal refractive index perturbation and devices for tuning, attenuating, switching, and modulating optical signals

申请公布号：US2004252939(A1)

申请号：US20040886800

申请日期：2004.07.08

申请公布日期：2004.12.16

申请人：

GAYLORD THOMAS K.;VAN WIGGEREN GREGORY D.;DAVIS DONALD D.;GLYTSIS ELIAS N.;ANEMOGIANNIS EMMANUEL

发明人：GAYLORD THOMAS K.;VAN WIGGEREN GREGORY D.;DAVIS DONALD D.;GLYTSIS ELIAS N.;ANEMOGIANNIS EMMANUEL

分类号：G02B6/02;(IPC1-7):G02B6/26;G02B6/34

主分类号：G02B6/02

摘要：The present invention relates to a type of optical fiber grating having an azimuthal refractive-index perturbation. The optical fiber includes a fiber grating that has a plurality of grating elements formed therein. At least one of the grating elements has a spatially varying index of refraction that varies azimuthally about the centerline of the optical fiber. The fiber grating acts as a band-stop optical spectral filter. In addition, since fiber-cladding modes are weakly-guided modes, their power can be easily dissipated by scattering, bending, stretching, and/or rotating the optical fiber. Multiple configurations of these gratings within an optical fiber are given. Devices are presented which can dynamically attenuate, tune, switch, or modulate the wavelength spectral characteristics of an optical signal.