Optical-Fiber-Based Spectrum Analyzer
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
An optical-fiber-based spectrum analyzer is described in which one end of the fiber acts as a reflector of the spectrum analyzer resonator. One end 2 of the optical fiber 1 is polished and a dielectric coating is deposited by evaporation on end 2 to make the end 2 cross-section highly reflective. The fiber 1 can then be paired with a spherical reflector 3 to form a resonator. In this resonator, the distance R between the two elements must be equal to the radius of curvature of the spherical reflector 3, i.e., twice the focal length of the reflector 3. Both the fiber 1 and reflector 3 must be mounted rigidly relative to each other, and the reflector is mounted on a piezoelectric element 4 so that the resonator can be scanned.