Patent ID: 7924427

Claim:
A rotation sensor comprising: a light source; a coupler for splitting light from the light source into a first beam and a second beam; a first light guide having an introduction point and an end, the first light guide formed in a spiral shape and having a photonic crystal structure receiving the first beam at the introduction point of the first light guide, the photonic crystal structure of the first light guide being a plurality of pillars, positioned transverse to propagation of the first beam, and a pair of crystal slabs, for creating a predefined path for the first beam; a second light guide having an introduction point and an end, the second light guide formed in a spiral shape adjacent and concentric with the first light guide in the same plane as the first light guide, the second light guide having a photonic crystal structure receiving the second beam at the introduction point of the second light guide, the photonic crystal structure of the second light guide being a plurality of pillars, positioned transverse to propagation of the second beam, and a pair of crystal slabs, for creating a predefined path for the second beam; and a turn at the end of the first light guide connected to the end of the second light guide.