An array of bandpass detectors for measuring beam spectral components

A clear understanding of the spectral components of an irradiated beam, or captured optical emission, is essential to optimize an optical system and increase its performance. Logically, for this purpose a grating-based spectrometer could be the first choice. However, in the case of a wide range spectrum, and for radiation with one dominant...

Optical coupling structure made by imprinting between single-mode polymer waveguide and embedded VCSEL

Polymer-based integrated optics is attractive for inter-chip optical interconnection applications, for instance, for coupling photonic devices to fibers in high density packaging. In such a hybrid integration scheme, a key challenge is to achieve efficient optical coupling between the photonic chips and waveguides. With the single-mode polymer...

Extension of Marcatili's analytical approach for rectangular silicon optical waveguides

Marcatili's famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-index-contrast waveguides. However, photonic-integrated circuit technology has advanced to high-index-contrast (HIC) waveguides. In this paper, we improve Marcatili's model by...

Extension of Marcatili's analytical approach for 220 nm high waveguides in SOI technology

Marcatili’s famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-indexcontrast waveguides. However, silicon-on-insulator (SOI) technology has become one of the focus platforms for integrated optics over the last decade, and the silicon...

SOI based mechano-optical pressure sensor using a folded micro ring resonator

A compact, mass producible Silicon On Insulator (SOI) based pressure sensor consisting of a folded Micro Ring Resonator (MRR) on a circular diaphragm is successfully designed, fabricated and characterized. An application of pressure deflects the diaphragm, causing stress in the MRR, which elongates the waveguide length and changes the effective...

Foil-based optical technology platform for optochemical sensors

This paper describes the development of a low-cost technology platform for fluorescence-based optochemical sensors. These sensors were constructed by incorporating fluorescent sensing elements in the core of multimode waveguides or lightguides, and have applications in medical, biochemical and environmental diagnostics. Flexible lightguides were...

Optimized 3-D simulation method for modeling out-of-plane radiation in silicon photonic integrated circuits

We present an accurate and fast 3-D simulation scheme for out-of-plane grating couplers, based on 2-D rigorous [finite difference time domain (FDTD)] grating simulations, the effective index method, and the RayleighSommerfeld diffraction formula. In comparison with full 3-D FDTD simulations, the rms difference in electric field is below 5% and...

Gas coning control for smart wells using a dynamic coupled well-reservoir simulator

A strong increase in gas inflow due to gas coning and the resulting bean-back because of Gas to Oil Ratio (GOR) constraints can severely limit oil production and reservoir drive energy. In this paper we will use a coupled reservoir-well model to demonstrate that oil production can be increased by using controlled inflow from a gas cone as a...

Ethyl benzene-induced ototoxicity in rats: A dose-dependent mild-frequency hearing loss

Rats were exposed to ethyl benzene at 0, 300, 400 and 550 ppm for 8 hours/day for 5 consecutive days. Three to six weeks after the exposure, auditory function was tested by measuring compound action potentials (CAP) in the frequency range of 1-24 kHz and 2f1-f2 distortion product otoacoustic emissions (DPOAEs) in the frequency range of 4-22.6...

Compact Photonic Integrated Phase and Amplitude Controller for Phased-Array Antennas

Feasibility of an extremely compact photonic integrated circuit for controlling phase and amplitude of a 16- element phased-array microwave antenna has been demonstrated experimentally

InP-based spotsize converter for integration with switching decvices

We have designed and fabricated an InGaAsP-InP based spotsize converter (SSC), which is compatible with the waveguide structure used in monolithic integrated ADM's and OXC's. In a first experiment, a total coupling loss to a cleaved fiber of 4.2 dB for TE and 3.9 dB for TM was realized with a 1.5 mm-long SSC. The 1-dB alignment tolerances...

Hybrid integrated electro-optic sensor platform

Optical sensors are an important class of sensors. They can offer high sensitivity, high electromagnetic immunity and compactness. An important sub-class is formed by the fiber-optic based sensors. They are used among others for smart structures, where the fiber is used in a distributed sensor configuration. In these systems the light generation...

Hybrid Coupling of Laser Light sources to Silicon (Oxy)Nitride Based Waveguides

An efficient method was developed to couple a diode laser to a high contrast waveguides. The laserdiodes were mounted with sub-micron precision using a thermocompression mounting technique. An AlGaAs (λ = 850 nm) laserdiode was coupled to a SiON based slab waveguide (efficiency η EQ 25 - 30%) and to a Si2N4 based ridge waveguide (efficiency η =...

Geïntegreeerde optica; de Missing Link in de optische telecommunicatie

Hybride laser/chip-koppeling voor coherente ontvanger

Door ontwikkelingen als de digitale (high definition) televisie zal de behoefte aan breedbandig datatransport sterk toenemen. Optische communicatie is bij uitstek geschikt om deze functie te vervullen. Het Fysisch en Elektrontsch Laboratorium TNO (FEL-TNO) draagt door onderzoek naar de koppeling van een laser en een optische schakeling bij aan...