Silicon-based compact eight-channel wavelength and mode division (de)multiplexer for on-chip optical interconnects.

A compact wavelength and mode division (de)multiplexer is proposed for multiplexing a total of eight guided TE modes of a 220 nm thick silicon-on-insulator waveguide with input channels at two wavelengths of 1.55 and 2 µm for wavelength division multiplexing. The (de)multiplexer is composed of four sequentially arranged sections with bus waveguides of increasing widths.

SOI-based compact mode- and polarization-division multiplexer for on-chip optical interconnects: design and simulation.

A compact seven-channel hybrid mode- and polarization-division multiplexer based on a silicon-on-insulator (SOI) waveguide platform is proposed for on-chip optical interconnects. Three independent signals are coupled into the , , and mode of a three moded waveguide using a taper, a polarization beam splitter, and an asymmetric directional coupler in the first coupler section. In the adiabatically connected second and third sections, two collocated asymmetric directional couplers are used to couple two TE modes (, ) and two TM modes (, ) to reduce the footprint of the device.

Localized surface plasmon resonance-based fiber-optic sensor for the detection of triacylglycerides using silver nanoparticles.

A label-free technique for the detection of triacylglycerides by a localized surface plasmon resonance (LSPR)-based biosensor is demonstrated. An LSPR-based fiber-optic sensor probe is fabricated by immobilizing lipase enzyme on silver nanoparticles (Ag-NPs) coated on an unclad segment of a plastic clad optical fiber. The size and shape of nanoparticles were characterized by high-resolution transmission electron microscopy and UV-visible spectroscopy.

Long period fiber grating based sensor for the detection of triacylglycerides.

In this paper, stable, label free enzyme based sensor using long period fiber grating (LPG) is described for the detection of triacylglycerides. A stable covalent binding technique for lipase enzyme immobilization on an optical fiber is reported. An active and stable attachment of the functional group of the enzyme on the fiber surface is achieved using this method.

Analysis of transmission characteristics of long period gratings in tapered optical fibers.

We report an analysis of the transmission characteristics of long period gratings written in a linearly tapered optical fiber. Such gratings are best analyzed by a coupled mode theory that includes several cladding modes simultaneously. However, the numerical solution needs to be modified to take into account the changing propagation constants along the length of the fiber.

Long period grating refractive-index sensor: optimal design for single wavelength interrogation.

We report the design criteria for the use of long period gratings (LPGs) as refractive-index sensors with output power at a single interrogating wavelength as the measurement parameter. The design gives maximum sensitivity in a given refractive-index range when the interrogating wavelength is fixed. Use of the design criteria is illustrated by the design of refractive-index sensors for specific application to refractive-index variation of a sugar solution with a concentration and detection of mole fraction of xylene in heptane (paraffin).