US 6,608,708 B1 · System and method for using a holographic optical element in a wireless telecommunication system receiver

Abstract

A holographic optical element (HOE) device is mounted in a receiver unit, such as a wireless optical telecommunication system receiver. The HOE device includes a developed emulsion material having an interference pattern recorded thereon, sandwiched between a pair of elements, such as a pair of clear glass plates. In operation, the HOE device uses the recorded interference pattern to diffract incident light rays towards an optical processing unit of the system receiver. The optical processing unit includes a photodetector that detects the diffracted light rays. The system receiver can include various other components and/or can have various configurations. In one configuration, a plurality of mirrors is used to control the direction of the light rays coming from the HOE device, and a collimating optical assembly collimates these light rays. A beam splitting optical assembly can be used to split the light rays into a tracking channel and a communication channel.

Claims31

Dependent claims

An optical wireless telecommunications system receiver, comprising:

a holographic optical element (HOE) device including:
a first element having first and second surfaces, the first surface being positionable to receive incident light comprising an optical signal having data modulated thereon transmitted from a remote optical transmitter,
an emulsion material disposed on the second surface of the first element and having a recorded interference pattern to diffract portions of received light having said one or more predetermined wavelengths;
a second element having a first surface disposed on the emulsion material, the second element being structured to pass resulting light, derived from the incident light diffracted by the recorded interference pattern, in a direction toward a location facing a second surface of the second element;
and
an optical processing unit including a detector positioned to receive the resulting light and electronics to demodulate an output of the detector to extract the data modulated thereon.

3 more elements

Dependencies are inferred from the claim text.

System and method for using a holographic optical element in a wireless telecommunication system receiver

Life of this patent

System and method for using a holographic optical element in a wireless telecommunication system receiver

Life of this patent

Abstract

Claims31