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Fiber optical time-division-multiplexed unbalanced pulsed interferometer with polarization fading compensation

  • US 5,173,743 A
  • Filed: 05/28/1991
  • Issued: 12/22/1992
  • Est. Priority Date: 05/28/1991
  • Status: Expired due to Term
First Claim
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1. A fiber optics pulsed interferometer comprising:

  • a source of pulsed optical signals periodically delivering periodic polarized optical pulses; and

    ,an unbalanced fiber optic compensating interferometer for producing timed two-pulse sequences in which a predetermined one of said two pulses alternates its polarization orientation from sequence to sequence, said unbalanced fiber optics compensating interferometer including;

    a long arm and a short arm;

    means responsive to said periodic polarized optical pulses for splitting each periodic polarized optical pulse to provide optical signals to said long and short arm, and for switching the polarization of said optical signals in at least one of said arms, the optical signals passing through said arms and being combined in a coupler to deliver a separated two-pulse sequence, the polarizations of a predetermined one of the individual pulses in each two-pulse sequence alternating from sequence to sequence.

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