A dielectric fibre with a refractive index higher than its surrounding region is a form of dielectric waveguide which represents a possible medium for the guided transmission of energy at optical frequencies. The particular type of dielectric-fibre waveguide discussed is one with a circular cross-section. The choice of the mode of propagation for a fibre waveguide used for communication purpose...

Modal analysis of waveguides and resonators by integra-lequation formulations can be hindered by the existence of spurious solutions. In this paper, spurious solutions are shown to be eliminated by introduction of a Rayleigh-quotient based matrix singularity measure. Once the spurious solutions are eliminated, the true modes may be determined efficiently and reliably, even in the presence of de...

We present here a new type of polymer waveguides (i.e., capped waveguide) fabricated using contact photolithography with considerable performance improvement over the conventional waveguides. We also show that by simultaneous patterning of the core and the top cladding in capped waveguides, we can considerably reduce the effect of fabrication defects and reduce the propagation lose by at least ...

The optical properties of slab waveguides made of indefinite permittivity (ε) materials (IEMs) are considered. In this medium, the real part of the transverse permittivity is negative while that of the longitudinal permittivity is positive. At any given frequency, the IEM waveguide supports an infinite number of transverse magnetic (TM) eigenmodes. For a slab waveguide with a fixed thickness, a...

Phased array antennas are expected to be effective for use in advanced wireless communications for mobile radio communication, wireless LAN, and satellite communication [1]. Recently, the application of photonics technology to microwave array antennas has been studied [2-5]. An optically controlled phased array antenna is very well-suited for fiber-optic microwave or millimeter-wave links. Opti...

To enhance lasers’ power and improve their performance, a model wasapplied for the waveguide design of 400 nm InGaN/InGaN semiconductor laser, whichis much easier to implement. The conventional and new laser structures weretheoretically investigated using simulation software PICS3D, which self-consistentlycombines 3D simulation of carrier transport, self-heating, and opt...

The predicted growth of broadband services, has led to extensive research for high capacity systems and networks. Current efforts are concentrated on the investigation of optical time-division multiplexing (OTDM) techniques combined with wavelength-division multiplexing (WDM) in order to fully utilize the potential of the installed fibers. All-optical switches, which can route a signal spatiall...

This paper presents a review of the development of long-period waveguide gratings (LPWGs) with focus on the realization of various kinds of tunable devices, such as band-rejection filters, variable attenuators, band-pass filters, and add/drop multiplexers. A number of specific examples are given to demonstrate how the geometry and material flexibility of the optical waveguide technology facilit...

Continuum generation from normally dispersive ultrahigh-numerical-aperture fibers deteriorates in relatively short times, limiting its application as a practical optical source for high-resolution optical coherence tomography. We find that reversible light-induced structural modification of fiber optic materials, rather than permanent optical damage, is responsible for this deterioration. By ex...