Patent ID: 7162159
Filing Date: 2007-01-09
Classification: H04B

Abstract:
1. A method of position demodulation in an optical wireless link (OWL), the method comprising the steps of: polarizing a light beam transmitted from a first OWL; and passing the polarized light beam transmitted from the first OWL through a polarization detector within a second OWL to detect amplitude changes as the beam passes through at least one polarity-detecting filter wherein the step of polarizing a light beam transmitted from a first OWL comprises polarizing a light beam into a desired set of regions such that each region has a polarity that is distinct from the polarity associated with each other region, and wherein the step of passing the polarized light beam transmitted from the first OWL through a polarization detector within a second OWL to detect amplitude changes as the beam passes through at least one polarity-detecting filter comprises passing the polarized light beam transmitted from the first OWL through a single variable polarity detecting filter that operates in response to an input voltage level to change its angle of polarity such that data corresponding to each region within the desired set of regions is demodulated in response to amplitude changes.