Abstract:
The invention comprises a spatial filter and a method of spatially filtering a laser beam, particularly a high power laser beam. The inventive spatial filter and method of use is especially suited for use in an optical system for writing index gratings in optical waveguides. The invention provides a method of writing gratings in optical waveguide fiber that results in improved grating performance.
Abstract:
Filter gratings are formed in optical waveguides having photosensitive cores by exposing the cores to actinic radiation in the form of interfering beams having peak intensities that are relatively displaced along an optical axis of the waveguides. Each of the interfering beams has a single-lobed intensity profile and a degree of spatial coherence required to achieve a desired fringe contrast between the two relatively displaced beams. Index modulations in the photosensitive core match the illumination (interference) pattern of the radiation. The relative displacement of the interfering beams reduces side lobes of the gratings' spectral responses by leveling the average refractive index of the index modulations. A second exposure with the two beams but without the beams' interference effects further levels the average refractive index.
Abstract:
Apparatus for forming a refractive index grating in a waveguide in accordance with the invention includes a waveguide formed from a material that changes its index of refraction when exposed to a beam of optical radiation, a source of coherent optical radiation for forming a beam of radiation, a mirror arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror and the phase delay plate are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide.
Abstract:
A variable period amplitude grating mask for use in making a long period Bragg grating is realized by a helically coiled spring. Stretching or compressing the spring changes the periodicity of the mask. A photosensitive optical waveguide, planar or fiber, is positioned within the spring coils along the major axis of the spring. Actinic radiation is incident on the masked waveguide, and induces an index perturbation in the waveguide having the periodicity of the mask. Different spring coil sizes and/or orientation of the waveguide with respect to the mask provide linear and nonlinear (chirped) grating periods. A device and method are described.
Abstract:
An abstract component model can be used to drive an editor by providing an underlying stateful model for component implementation without the need to re-implement details. The abstract component model can represent one or more artifacts, wherein the abstract component model contains a plurality of model objects. A lightweight structure model contains a plurality of structure objects, wherein each structure object is a data structure that represents how the abstract component model should look like at the end of an update cycle. Additionally, a model updater can match one or more structure objects in the lightweight structure model to one or more model objects in the abstract component model, and update each said model object in the one or more structure objects based on said one or more structure objects in a top-down, depth-first fashion.
Abstract:
A personalization system that uses rules to adjudicate and characterize a customer, or a customer's actions, and then to personalize a business function, such as a displayed page, based on the outcome of those rules. In one embodiment the invention provides a system for web-based personalization, that allows for personalizing the content or business functioning of a web-based application to reflect the characteristics of a particular user. The system comprises a user profiler, for determining a snapshot of a particular user of a web-based application, a rules editor for inputting a set of rules governing the business functioning of said web-based application, and a rules engine. The system then uses the set of rules to make decisions about the particular user and the business functioning of said web-based application, and to determine the content or business functioning of said web-based application as it applies to that user.
Abstract:
An abstract component model can be used to drive an editor by providing an underlying stateful model for component implementation without the need to re-implement details, such as event listening, lifecycle and update management, etc. An implementation needs to provide objects that make up the model, some logic to listen to environmental changes and recognize when an update is needed, and a builder which can generate a lightweight version of the model based on the current “state of the world.” In addition, abstract component model is operable to support an editor such as page flow.
Abstract:
Methods for preparing crosslinking agents that are the ungelled reaction product of (a) at least one aminoplast resin and (b) at least one modifying compound, wherein the crosslinking agents are essentially free of active hydrogen functional groups and have a glass transition temperature of at least 10° C. are disclosed. The methods include, inter alia, the use of vacuum and/or increased rates of inert gas introduction during reaction.
Abstract:
An evanescent wave system and method including an optical sensor for use in assaying a reference material and at least one molecular species or analyte in a test medium or test sample for diagnostic and other applicable purposes. The sensor includes a waveguide for propagating a radiation input along its length. The radiation input causes evanescent electromagnetic waves that are capable of stimulating output emissions that are indicative of a reference material and of one or more molecular species or analytes. By comparing the emission(s) indicative of the reference material to the emission indicative of the presence of the molecular species or analyte, the presence and concentration of the molecule in the sample can be determined. The reference material provides for normalization and/or calibration of the system.
Abstract:
An evanescent wave system and method including an optical sensor for use in assaying a reference material and at least one molecular species or analyte in a test medium or test sample for diagnostic and other applicable purposes. The sensor includes a waveguide for propagating a radiation input along its length. The radiation input causes evanescent electromagnetic waves that are capable of stimulating output emissions that are indicative of a reference material and of one or more molecular species or analytes. By comparing the emission(s) indicative of the reference material to the emission indicative of the presence of the molecular species or analyte, the presence and concentration of the molecule in the sample can be determined. The reference material provides for normalization and/or calibration of the system.