Optical device for beam splitting and recombining

  • US 5,410,625 A
  • Filed: 05/19/1993
  • Issued: 04/25/1995
  • Est. Priority Date: 12/20/1990
  • Status: Expired due to Term
First Claim
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1. An optical device including a multimode waveguide having a transverse cross-section wherein:

  • (a) a first coupling waveguide, operating in a fundamental mode operation, is connected to the multimode waveguide centrally of the multimode waveguide'"'"'s transverse cross-section,(b) at least two second coupling waveguides, each operating in a fundamental mode operation, are connected to the multimode waveguide with port centers spaced apart across the multimode waveguide'"'"'s transverse cross-section,(c) said first coupling waveguide and said multimode waveguide comprise a means for propagating an in-phase symmetric fundamental mode of the first coupling waveguide and for exciting only symmetric modes of the multimode waveguide, and said multimode waveguide and said second coupling waveguide comprise a means for exciting a fundamental mode of each second coupling waveguide by modal dispersion along a path of radiation within the multimode waveguide.

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