Leaky waveguide structures have received great interest lately and several novel devices based on the leaky waveguides have been proposed and demonstrated. For instance, the low-loss ARROW devices have been fabricated on various materials and can be used as a polarizer. ARROW or Bragg-reflection waveguides (BRW) can be used to build strongly coupled directional couplers with large separation. The leaky waveguide structures can also be used in the detector design ...
Optical grating structures are basic elements in filters, DFB/DBR lasers. Coupled-mode theory is often used in the analysis of these devices. The mode patterns in the coupled-mode analysis do not vary along waveguide axis. The periodic perturbations therefore only change the amplitudes of the ideal modes. This approximation is, however, valid only if the grating perturbation is weak. Otherwise, the ideal mode approximation will become questionable. The problem is more ...
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