Method and apparatus for direct transmission of an optical image

An apparatus for direct transmission of an optical image comprising:

• a plurality of first lens means for collimating light from said optical image into a plurality of first parallel beams;
• a transmission medium for transmitting optical signals;
• a plurality of holographic storage media containing information on distortion of said transmission medium;
• a plurality of mirrors;
• a plurality of second lens means for focusing each of a plurality of first parallel beams passing through each of said plurality of holographic storage medium onto the respective surface of said plurality of mirrors and collimating beams reflected from each of said plurality of mirrors into a plurality of second parallel beams, the directions of propagation of said plurality of second parallel beams being opposite to those of said plurality of first parallel beams;
• a third lens means for directing phase conjugate waves reproduced from said plurality of holographic storage medium by said plurality of second parallel beams to said transmission medium;
• and
• an image display for displaying said optical signals transmitted through said transmission medium.

A method for direct transmission of an optical image comprising the steps of:

• collimating light from said optical image into a first parallel beam;
• passing said first parallel beam through a holographic storage medium containing information on distortion of a transmission medium and focusing said first parallel beam onto the surface of a mirror;
• collimating a beam reflected from said mirror into a second parallel beam;
• reproducing a phase conjugate wave by passing said second parallel beam through said holographic storage medium;
• directing said phase conjugate wave to said transmission medium;
• and
• displaying optical signals from said transmission medium on an image display.

A method for recording a holographic storage medium for image compensation comprising the steps of:

• providing a light from a selected resolution element of an output light array;
• directing said light to a first transmission medium;
• collimating said light from said first transmission medium into a first parallel beam and illuminating said first parallel beam as a signal beam on said holographic storage medium;
• collimating a light from a resolution element of an input light array which corresponds to said light from said selected resolution element into a second parallel beam, and illuminating said second parallel beam as a reference beam on said holographic storage medium;
• determining if there are more resolution elements to be recorded;
• and
• selecting a next resolution element from said output light array and repeating said providing step through said determining step if there are more resolution elements,
• the step of providing a light comprising the steps of:
• passing said light from said selected resolution element of said output light array via an object lens through a pin hole;
• enlarging said passed light by using a first lens and collimating said enlarged light into a third parallel beam;
• and
• moving a second lens to a position corresponding to that of said resolution element so that said third parallel beam is allowed to pass through said second lens, said second lens being attached to a screen by which the outside beam portion of said second lens is blocked.

A method for detecting any changes in the physical characteristics of transmission media comprising the steps of:

• collimating a light from an optical resolution element image into a first parallel beam;
• passing said first parallel beam through a holographic storage medium containing information on distortion of said transmission media and focusing said first parallel beam onto the surface of a mirror;
• collimating a beam reflected from said mirror back into a second parallel beam;
• reproducing a phase conjugate wave by passing said second parallel beam through said holographic storage medium;
• directing said phase conjugate wave to said transmission media;
• and
• comparing the optical information from said transmission media with said optical resolution element image.