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Fiber optic isolater and amplifier

  • US 5,191,467 A
  • Filed: 04/02/1992
  • Issued: 03/02/1993
  • Est. Priority Date: 07/24/1991
  • Status: Expired due to Term
First Claim
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1. A fiber optic isolator comprising:

  • a reflecting imaging device having a reflector;

    first and second ports, adapted to register the respective ends of first and second fibers at respective first and second optically conjugate locations;

    polarizer means located between said first port and said reflector, said polarizer means including a first birefringent plate;

    analyzer means located between said second port and said reflector, said analyzer means including a second birefringent plate;

    said first and second birefringent plates having projected optic axes at a relative angle of 45°

    to each other; and

    a 22.5°

    rotator disposed between said polarizer means and analyzer means on one side and said reflector on the other side;

    whereupon light entering said first port and passing through said polarizer means passes through said rotator, reflects from said reflector, passes again through said rotator, passes through said analyzer means, and leaves said second port, while light entering said second port and passing through said analyzer means passes through said rotator, reflects from said reflector, passes again through said rotator, and is prevented by said polarizer means from leaving said second port.

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