Patent ID: 8520214

Claim:
An optical gyroscope for detecting an angular difference, said gyroscope comprising: a laser for emitting a pulse beam of coherent photons, said beam having pulse duration σ; a pre-selection polarizer for pre-selecting said coherent photons as polarized photons; a polarizing beam splitter for separating said polarized photons by their horizontal |+ and vertical |− polarization eigenstates as separated photons; a coil of optical fiber having radius r, said coil being rotated by a difference rotation angle Δθ, said coil preserving polarization of said separated photons; a recombining beam splitter for recombining said separated photons from said coil as recombined photons; a post-selection polarizer for post-selecting said recombined photons as selected photons; a spectrometer for capturing said selected photons and measuring associated frequency translation δω; and an analyzer for determining said difference rotation angle as Δθ = ± ( c ⁢ ⁢ σ 2 ⁢ tan ⁢ ⁢ χ 2 ⁢ r ) ⁢ δω , wherein c is speed of light, and χ is polarization shift angle.