Optical hotspots underpin a wide variety of photonic devices ranging from sensing, nonlinear generation to photocatalysis, taking advantage the strong light–matter interaction at vicinity nanostructures. While plasmonic nanostructures have been widely used for strongly localized electromagnetic energy on surfaces, they suffer high loss and consequently low quality factor. Resonance-based dielec...

In this paper, a three ring-resonator serially coupled is considered as an optical filter. We are going to improve the performance of the designed optical filter by increasing the quality factor and finesse of filtered wavelengths. The first and last rings are coupled to the bus waveguides that carry the input and output fields. The effect of coupling parameters and ring radii on the filtering ...

Literature which reports on optical methods of nondestructive quality evaluation of agricultural and biological materials is reviewed. The basic laws and interaction of light with biological materials are presented with particular regard to their applicability in quality evaluation. A wide range of agricultural and biological materials such as fruits, vegetables, seeds, cereal grains, eggs and ...

Time division multiple access (TDMA) multiplexing of ATM cells from thousands of residential customers toward the common feeder of a Passive Optical Network (SuperPON) tree obviates the need for an equal number of optical line terminations (OLT’s). All upstream transmissions converge by means of the passive splitters/combiners to just one OLT unit which serves all by time sharing. The ability t...

As an inexpensive, simple, and scalable solution for broadband access, Ethernet passive optical networks (EPONs) have the capability of delivering integrated broadband services to the end users. A critical issue of EPONs is the utility of a shared upstream channel among the local users, and thus an efficient bandwidth allocation mechanism is required to facilitate statistical multiplexing among...

Transparent optical nodes (TONs), such as all-optical switches and erbium-doped fiber amplifiers, are an increasingly important part of wavelength-division multiplexed (WDM) networks. Our goal in this paper is to consider how quality of service (QoS) may be monitored at such TONs. The question is particularly important as access to WDM networks, and associated security concerns, increase. Our p...