Accurate modeling of photonic devices is essential for the development of new, higher performance optical components required by current and future high-bandwidth communications systems. This paper reviews several key techniques for such modeling, many of which are used in commercial design tools. These include several mode-solving techniques, the beam propagation method, the method of lines, and the finite-difference time-domain technique.

Numerical techniques for modeling guided-wave photonic devices

A review of the complexity development of InP-based Photonic ICs is given. Similarities and differences between photonic and microelectronic integration technology are discussed and a vision of the development of photonic integration in the coming decade is given.

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Moore's law in photonics

/pdf/moore-s-law-for-photonics-536zpzk56z.pdf

Moore's law for photonics

Meeting the increasing demand for capacity in wireless networks requires the harnessing of higher regions in the radiofrequency spectrum, reducing cell size, as well as more compact, agile and power-efficient base stations that are capable of smoothly interfacing the radio and fibre segments. Fully functional microwave photonic chips are promising candidates in attempts to meet these goals. In recent years, many integrated microwave photonic chips have been reported in different technologies. To the best of our knowledge, none has monolithically integrated all the main active and passive optoelectronic components. Here, we report the first demonstration of a tunable microwave photonics filter that is monolithically integrated into an indium phosphide chip. The reconfigurable radiofrequency photonic filter includes all the necessary elements (for example, lasers, modulators and photodetectors), and its response can be tuned by means of control electric currents. This is an important step in demonstrating the feasibility of integrated and programmable microwave photonic processors. A tunable photonic microwave filter is monolithically integrated in an InP chip. The filter includes all of the required elements — a laser, a modulator and a photodetector — and its response can be tuned by controlling the electric currents.

/pdf/a-monolithic-integrated-photonic-microwave-filter-6qii06d59o.pdf

A monolithic integrated photonic microwave filter

Similarities and differences between photonic and microelectronic integration technology are discussed and a vision of the development of InP-based photonic integration in the coming decade is given.

/pdf/generic-foundry-model-for-inp-based-photonics-4jw9trm6s4.pdf

Generic foundry model for InP-based photonics

A novel integrated polarization converter based on ultra short bends is presented, which has a potential for low loss and small device size. A conversion value of 85% was experimentally measured with excess loss of 2.7 dB and overall dimensions of 975/spl times/83 /spl mu/m. Also 45% conversion was measured with extremely low excess loss of 0.4 dB for a device size of 760/spl times/86 /spl mu/m.

/pdf/novel-compact-polarization-converters-based-on-ultra-short-rq2pgq5966.pdf

Novel compact polarization converters based on ultra short bends

The vectorial analysis by the method of lines is extended to investigate optical waveguides consisting of several circularly bent strips. Bessel functions of very large and complex order are employed to calculate radiation loss and intensity distribution, for example, for a rib waveguide.

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/93RS01829%4010.1002/%28ISSN%291944-799X.SYDNEY1

Vectorial analysis of bends in optical strip waveguides by the method of lines

The investigation of various antenna placements for Car-to-Car (C2C) communication has turned out to be crucial to achieve an omnidirectional coverage in the horizontal plane of the antenna. The complex shape and huge electrical size of a car at 5.9 GHz yield a high challenge for the numerical modeling. In this contribution, a new way of handling the analysis of near and far-field propagation for C2C antennas is proposed and applied in examples, which enables to investigate the whole car chassis by asymptotic methods, with a significantly reduced computational effort compared with a full wave analysis. The effect on radiation pattern of an antenna placed on the roof, side mirrors and bumpers is discussed. Dispensable parts of the car have been identified to speed up the simulation without losing accuracy. The influence of a glass roof on the radiation pattern is characterized using full wave methods in order to account for wave guidance, diffractions and creeping waves. Measurements are in good agreement with simulations.

Antenna placement and wave propagation for Car-to-Car communication

A novel discretization on two crossed line systems is introduced in the method of lines to analyze junctions in rectangular waveguides. This discretization is one-dimensional and replaces the two-dimensional discretization otherwise necessary for such structures. Hence the matrices encountered are small compared with other approaches. Equivalent circuits for the right-angle E-plane corner and scattering parameters for the asymmetric T-junction are presented, which agree very well with literature.

Analysis of rectangular waveguide junctions by the method of lines

The method of lines is extended to inhomogeneous dielectric layers by means of an additonal transformation and special consideration of the discretized dielectric constant. The computed dispersion diagrams for dielectric waveguides agree very well with the results from other authors, including such cases, where backward waves exist. New results for the coupling between dielectric waveguides and a microstrip line are given.

WW Pascher

Papers

Novel compact polarization converters based on ultra short bends

Vectorial analysis of bends in optical strip waveguides by the method of lines

Antenna placement and wave propagation for Car-to-Car communication

Analysis of rectangular waveguide junctions by the method of lines

Analysis of Hybrid Waveguide Structures Consisting of Microstrips and Dielectric Waveguides