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- Otto Schwelb
- 1999

A method is introduced to simplify the analysis and design of microwave and optoelectronic networks such as spectral filters, interferometric sensors, etc., comprised of 2 2 couplers, waveguides, reflectors, and mismatched interfaces. The key element which makes it possible to reduce topological complexity and rearrange a network into a chain of cascaded… (More)

- Otto Schwelb
- 2007

Microring and microdisk resonators are used in photonic circuits to perform filter functions, serve as bandlimited mirrors in lasers, compensate for dispersion and group delay distortion, are used in multiplexers in telecommunication systems, and a number of other applications such as medical instrumentation, biosensing, interferometry, to name a few. This… (More)

- E L Adler, M P da Cunha, O Schwelb
- IEEE transactions on ultrasonics, ferroelectrics…
- 1991

A network model for surface-acoustic-wave (SAW) structures fabricated along arbitrary and hence nonsymmetric orientations, including natural single-phase unidirectional transducer (NSPUDT) directions, is described. From the predictions of this model for SAW gratings. the frequently used coupling of modes (COM) phenomenological description is evaluated. The… (More)

- Václav Zima, Otto Schwelb
- Kybernetika
- 1990

- H Zhang, M J Li, S I Najafi, O Schwelb
- Applied optics
- 1994

A two-step proton-exchange process to produce waveguides and gratings in lithium niobate is described. In both steps, mixtures of lithium benzoate and benzoic acid are used. The fabricated components are characterized at 0.633 and 0.422 µm. In particular, we observe that the light intensity diffracted into the air by the grating is ~0.5% of that in the… (More)

- S N Prasad, O Schwelb
- IEEE transactions on ultrasonics, ferroelectrics…
- 1990

A numerical method of rapidly computing the width of the stopband of a shallow grating in a SAW filter and the dependence of this bandwidth on fabrication parameters is presented. The method is based on the properties of the equivalent circuit of the unit cell at the transition frequencies. Numerical results illustrate the variation of the relative… (More)

- O Schwelb, E L Adler, J K Slaboszewicz
- IEEE transactions on ultrasonics, ferroelectrics…
- 1990

A systematic procedure for modeling, simulating, and designing SAW (surface acoustic wave) grating filters, taking losses into account, is described. Grating structures and IDTs (interdigital transducers) coupling to SAWs are defined by cascadable transmission-matrix building blocks. Driving point and transfer characteristics (immittances) of complex… (More)

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