We report on the demonstration of a spot size converter (SSC) for monolithic photonic integration at a wavelength of 850 nm on a GaAs substrate. We designed and fabricated a dual-waveguide AlGaAs chip. The design consists of a lower waveguide layer for efficient end-fire coupling to a single-mode fiber, an upper waveguide layer for high refractive index contrast waveguides, and a vertical SSC t...

We propose that a tapered photonic crystal waveguide design can unify optical trapping and transport functionalities to advance the controllability of optical manipulation. Subwavelength particles can be trapped by a resonance-enhanced field and transported to a specified position along the waveguide on demand by varying the input wavelength. A simulated transport ability as high as 148 (transp...

The design of demultiplexers based on array waveguides is well known [1-5]. A new design based on the concept of variable waveguide depth was recently reported [6]. Since, the fabrication of channel waveguides on glass, silica or lithium niobate is mostly controlled by the lithography pattern and the subsequent fabrication process, it is difficult to implement the variable depth concept on thes...

A transition from coaxial-tocoplanar waveguide (CPW) for microwave breast cancer detection antennas is presented and design rules based on analytical calculations and simulated one using CST Microwave Studio 2014 simulator are presented. The measured results show that an operating frequency range extends from 1GHz to 15GHz is obtained. This paper discuss mathematical method of coplanar waveguid...

............................................................................................................................ vi LIST OF FIGURES .................................................................................................................. x LIST OF ABBREVIATIONS/SYMBOLS ............................................................................. xv CHAPTER 1: INTRODUCTION ....

We design and experimentally demonstrate 50 picoseconds (ps) low loss delay line on 300 nm SOI platform. The delay line unit consists of straight rib waveguide and strip bend section linked by a transition taper waveguide. Low propagation loss of ~0.1 dB/cm is achieved on the straight rib waveguide. With taking into account both low loss and desirable delay, a complete design and characterizati...

Title of dissertation: MODELING AND DESIGN OF MICROWAVE-MILLIMETERWAVE FILTERS AND MULTIPLEXERS Yunchi Zhang, Doctor of Philosophy, 2006 Dissertation directed by: Professor Kawthar A. Zaki Department of Electrical and Computer Engineering Modern communication systems require extraordinarily stringent speci…cations on microwave and millimeter-wave components. In mobile and integrated communicati...

Design of passive ring-coupled lasers based on InGaAsP waveguides is investigated using beam propagation method. Mode coupling, propagation loss due to bending, and scattering loss from waveguide sidewall roughness are taken into account. By compromising threshold gain, linewidth and side-mode suppression ratio (SMSR), suitable waveguide width and coupling strength are determined for different ...

1Notes appear on page 48. Waveguide is an excellent microwave transmission line, with low loss and predictable performance, usable at any frequency by choosing the proper dimensions. The most common type of commercial waveguide is precision rectangular tubing, which is only affordable on the surplus market. Elliptical waveguide is also used commercially for microwave transmission line. Many mic...