Wavelength multiplexed two dimensional image transmission through single mode optical fiber

• US 5,315,423 A
• Filed: 02/18/1992
• Issued: 05/24/1994
• Est. Priority Date: 02/18/1992
• Status: Expired due to Term

• Current Assignee: Rockwell International Corporation
• Original Assignee: Rockwell International Corporation
• Inventors: Hong, John H.
• Primary Examiner(s): Chilcot, Jr., Richard E.
• Assistant Examiner(s): BACARES, RAFAEL D
• Application Number:
  US07/837,019
• Time in Patent Office: 826 Days
• Field of Search: 359/115, 359/124, 359/125, 359/129, 359/130, 359/131, 359/117, 359/127, 359/154, 385/317, 385/132
• US Class Current: 398/79
• CPC Class Codes: G02B 6/29323 Coupling to or out of the diffractive element through the lateral surface of the light guide evanescent grating couplers G02B6/29332
• CPC Class Codes: G02B 6/29325 of the slab or planar or plate like form, i.e. confinement in a single transverse dimension only integrated circuit planar waveguide arrangements G02B6/12007; specially adapted for lighting G02B6/0011
• CPC Class Codes: H04B 10/25 Arrangements specific to fibre transmission
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04Q 11/0003 Details

Abstract

An apparatus and method are provided for transmitting two-dimensional images through a single mode optical fiber. Light from a broadband source is dispersed into component wavelengths, spatially modulated to contain an image, collected for multiplexing in a single mode optical transmission fiber, transmitted through the single mode fiber, and demultiplexed into its component wavelengths to reproduce the transmitted image. The two-dimensional dispersing and collecting elements may be realized using thin film channel waveguides having arrays of optical gratings. Because the dispersive element at the receiving (output) end of the transmission fiber must reproduce the dispersal pattern used at the source, the information transmitting device may be used for data encryption and decryption.

Claims

1. A system for parallel transmission of a two-dimensional image through a single mode optical fiber, comprising:

a broadband light source;

a first thin film channel waveguide for dispersing said broadband light into a two-dimensional array of spectral components;

a two-dimensional spatial light modulator for modulating the intensity of said spectral components of said two-dimensional array to correspond to the two-dimensional image;

a second thin film channel waveguide for collecting and recombining said modulated spectral components into a broadband light beam;

a single mode optical fiber connected to said recombining means for transmitting said broadband light beam; and

a third thin film channel waveguide connected to said single mode fiber for receiving and dispersing said transmitted broadband light beam into said intensity modulated two-dimensional array of spectral components to reproduce the two-dimensional image.

2. The system of claim 1, wherein each of said thin film channel waveguides includes a plurality of optical gratings arranged to form a two-dimensional matrix, each of said gratings selectively diffracting at least one of said spectral components.

3. A system for parallel transmission of a two-dimensional image through a single mode optical fiber, comprising:

a source of broadband light;

a first thin film channel waveguide having a first two-dimensional matrix of optical gratings for dispersing said broadband light to project a two-dimensional array of component wavelengths of said broadband light on a plane;

a spatial light modulator positioned on said plane for modulating the intensity of said component wavelengths to define the two-dimensional image;

a second thin film channel waveguide having a second two-dimensional matrix of optical gratings for collecting and recombining said modulated component wavelengths into a broadband light beam;

a single mode optical fiber connected to said said second thin film channel waveguide for transmitting said broadband light beam; and

a third thin film channel waveguide connected to said single mode fiber and having a third two-dimensional matrix of optical gratings corresponding to said first matrix of optical gratings for receiving and dispersing said transmitted broadband light beam to reproduce the two-dimensional image.

4. The system of claim 3, wherein each of said optical gratings diffracts at least a predetermined one of said component wavelengths.

5. The system of claim 4, wherein said first two-dimensional matrix of optical gratings comprises a predetermined arrangement of said optical gratings for encrypting the two-dimensional image during transmission through said single mode fiber.