The imaging properties of multimode dielectric waveguides of rectangular cross-section, having a homogeneous refractive index n sub f, are investigated theoretically and experimentally. Two-dimensional self-images are formed by the phase coincidences of a large number of modes if the effective cross-section of the guide, including the penetration depths into the cladding, is a perfect square (side W sub a). The first single self-image is observed at the fundamental self-imaging distance L sub 1 4n sub f W sub a-sq/lambda sub 0, where lambda sub 0 is the vacuum wavelength. The theoretical linear resolution is approximately 1.5 micron for a guide of W sub a of about 44 microns. Experimentally, this resolution has not quite been reached contrary to the case of slab guides, but improved results are expected.
6th European Microwave Conference
- Pub Date:
- Phase Error;
- Propagation Modes;
- Rectangular Waveguides;
- Laser Applications;
- Electronics and Electrical Engineering