Transmitter using uniform intensity transmission for a wireless optical communication system
AssigneeTerabeam Corporation
InventorAlbert O. Okorogu
Life of this patent
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Abstract
A device that controls and reshapes optical signals generated by a laser or sent through fiber optic cables for eventual broadcast to various sectors. The optical train transforms the input Gaussian beam into a flat-top beam, a beam with a uniform intensity distribution. The device can operate either in a super broadband sector spectral output mode, which is a combination of independent orders of diffraction, or be extended to operate as a multi-beam system, where spatially separated beams are obtained at the output of the transmitter. In accordance with aspects of the present invention, both the point-to-sector and multi-beam schemes can be obtained from a single source.
Claims30
An apparatus comprising:
- a first optical element to create a uniform intensity flat-top beam placed in a path of an optical beam;
- and
- a second optical element to cancel a divergence and to correct a phase of the optical beam after it passes through the first optical element.
An apparatus comprising:
- a first optical element to collimate a light beam from a light source;
- a second optical element to focus the collimated light beam from the first optical element;
- a diffractive optical element to scatter the focused light beam into a plurality of diffraction orders in a cone and having an angular separation between the diffraction orders;
- a cross polarizer to correct the scattered light beam to eliminate any fringes in a far-field;
- and
- a spherical lens to collimate the corrected light beam into the far-field to produce a uniform intensity flat-top beam.
A method, comprising:
- creating a uniform intensity flat-top beam from a non-uniform intensity optical beam;
- and
- canceling a divergence and correcting a phase of the created uniform intensity flat-top beam.
A system, comprising:
- a light source to generate a nonuniform intensity optical signal;
- an apparatus coupled to the light source, the apparatus including a first optical element to transform the nonuniform intensity optical signal to a uniform intensity flat-top beam and including a second optical element to correct a phase of the uniform intensity flat-top beam after it passes through the first optical element;
- and
- at least one receiver located in a far-field to receive the uniform intensity flat-top beam after it passes through the second optical element.
Dependencies are inferred from the claim text.