Multimode waveguide
Abstract
Abstract DISPERSION IN A MULTIMODE WAVELENGTH, DUE TO DIFFERENCES IN THE GROUP VELOCITIES OF THE DIFFERENT MODES OF WAVE PROPAGATION, IS MINIMIZED BY DELIBERATELY INTRODUCING COUPLING MEANS ALONG THE GUIDE FOR STRONGLY COUPLING BETWEEN SELECTED PAIRS OF SAID MODES. IN GUIDES SUPPORTIVE OF MODES HAVING ONLY TWO DIFFERENT GROUP VELOCITIES, THE COUPLING, WHICH CAN BE EITHER CONTINUOUS OR AT LONGITUDINALLY SPACED INTERVALS ALONG THE GUIDE, HAS A SPACIAL PERIODICITY EQUAL TO THE BEAT WAVELENGTH BETWEEN THE DIFFERENT MODES. IN GUIDES SUPPORTIVE OF MODES HAVING THREE OR MORE DIFFERENT GROUP VELOCITIES, THE GUIDE IS PROPORTIONED SUCH THAT THE AVERAGE GROUP VELOCITIES OF SELECTED PAIRS OF GUIDED MODES ARE APPROXIMATELY EQUAL TO THE SAME MEANS VELOCITY, AND THE COUPLING MECHANISM HAS A SPACIAL DISTRIBUTION GIVEN BY THE SUPERPOSITION OF SINUSOIDS WHOSE PERIODICITIES ARE EQUAL TO THE BEAT WAVELENGTHS BETWEEN THE SELECTED PAIRS OF MODES.
Inventors
- 👤 Enrique Alfredo Jose Marcatili
Bibliographic Details
Claims Analysis
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