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Mode transducer for optical wave guides

  • US 3,980,392 A
  • Filed: 05/01/1975
  • Issued: 09/14/1976
  • Est. Priority Date: 05/02/1974
  • Status: Expired due to Term
First Claim
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1. A mode transducer for converting modes of different orders but of the same polarization during coupling between a pair of optical wave guides, comprising a coupling taper with a coupling structure arranged between the pair of wave guides, said coupling taper having an input thickness and an output thickness with the ratio of the opening angle of the light at the input and the output of the taper being equal to the square of the ratio of the input thickness and the output thickness;

  • at least one additional taper and coupling structure said additional taper and coupling structures being arranged in series with the first-mentioned taper and coupling structure so that a plurality of modes in one of the pair of wave guides are sequentially coupled into the other of said pair of wave guides; and

    the other wave guide including an electrical optical segment for each of the tapers, each optical segment having separate electrodes for applying an electrical field to the electro-optical segment so that the phase speed of each mode coupled to the other wave guide can be corrected to superimpose with the other modes coupled thereto.

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