Apparatus and Method for Varying a Bragg Wavelength of a Bragg Grating Formed in an Optical Fiber.
Abstract
An apparatus and method uses a Bragg grating formed in the core of an optical fiber. An element is coupled to the optical fiber and serves to vary a Bragg wavelength (i.e., a wavelength at which reflection occurs) of the Bragg grating by varying a refractive index of the core and/or a cladding of the optical fiber. The element can be an electro-optical element, a magnetooptical element or a chemo-optical element either sensing or being controllably varied, based on an electric signal, a magnetic signal or a presence or absence of a chemical, respectively. Alternatively, a dopant such as a rare-earth ion, can be formed in the core and/or cladding of the optical fiber and irradiated with laser light from a laser pump. A change in absorption spectra from ground state absorption to excited state absorption changes the refractive index of the core and/or cladding so that the Bragg wavelength of the Bragg grating is varied based on an intensity of the laser light.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1993
- Accession Number
- ADD015876
Entities
People
- Alan D. Kersey
- C. A. Villarruel
Organizations
- United States Department of the Navy