A temperature compensation circuit arrangement for liquid crystal cells in optical devices is presented. In an optical device, a liquid crystal cell typically manipulates the optical signals according to an output optical property, such as attenuation, responsive to an AC voltage source electrical signal. A feedback circuit arrangement is connected to the liquid crystal cell and controls the current through the liquid crystal cell with respect to temperature by a predetermined control equations for the output optical property so that the device manipulates the optical signals independently of temperature. The current follows the control equations, which are empirically determined with respect to temperature for one equation.
Anritsu Devices Co., Ltd. develops, manufactures, and sells optical devices and electronic devices, and our products are used as key components in optical communication systems and devices used in the medical, measurement, and disaster prevention fields.
Fluidic systems, including microfluidic systems, are used to manipulate light by light-fluid interaction so as to affect reflection, refraction, absorption, optical filtering, or scattering of the beam. One or more fluids may be provided to a channel or chamber and exposed to an incident beam, and the proportion of at least one of a plurality of fluids may be varied. Light may interact with a discrete fluid plug subject to movement within a channel. One or more flexible members may be employed, such as to provide a variable lens. Fluidic optical devices may be used in applications including optical switching, optical filtering, or optical processing. Multiplexed fluidic optical systems are further provided.
Binary optics has been interested widely in recent years, where the optical element can be fabricated on a thin glass plate with micro-ion-etching film layer. A novel optical scanning system for gene disease diagnostics is developed in this paper, where four kinds optical devices are used, such as beam arrays splitter, arrays lens, filter arrays element and detection arrays. A soft for binary device designing with iterative method is programmed. Two beam arrays splitters are designed and fabricated, where one devices can divide a beam into the 9x9 arrays , the other will divide a beam into the 13x13 arrays. The beam arrays splitter has a good diffraction efficiency ,70%, and an even energy distribution. The gene disease diagnostics system is portable by biochip and binary optics technology ...
A light emitting device which can be easily manufactured and can control the positions of light emission precisely, and an optical device. A first and second light emitting elements are formed on one face of a supporting base. The first light emitting element has an active layer made of GaInN mixed crystal on a GaN-made first substrate on the side thereof on which the supporting base is disposed. The second light emitting element has lasing portions on a GaAs-made second substrate on the side thereof on which the supporting base is disposed. Since the first and second light emitting elements are not grown on the same substrate, a multiple-wavelength laser having the output wavelength of around 400 nm can be easily obtained. Since the first substrate is transparent in the visible region, the positions of light emitting regions in the first and second light emitting elements can be precisely controlled by lithography.
0023] According to a second aspect of the present invention, there is provided a method of manufacturing an optical device, comprising forming a relief structure formation layer including first and second regions adjacent to each other, the second region being provided with recesses or protrusions and having a ratio of surface area to apparent area greater than that of the first region; vapor-depositing a first material having a refractive index different from that of a material of the relief structure formation layer entirely on the first and second regions to form a reflective material layer, the reflective material layer having a surface profile corresponding to surface profiles of the first and second regions, or the reflective material layer having a surface profile corresponding to the surface profile of the first region at a portion corresponding to the first region and being partially opened correspondingly to an arrangement of the recesses or protrusions at a portion corresponding to ...
A method of forming an optical device includes using a photomask to form a first mask on a device precursor. The method also includes using the photomask to form a second mask on the device precursor
Free Online Library: Fujitsu and Mitsui Launch QD Laser, Inc., Optical Device Venture for Commercialization of Quantum Dot Lasers. by JCN Newswires; Business
Described herein are the materials, mechanisms and procedures for optimizing various performance parameters of HPDLC optical devices in order to meet differing performance requirements. These optimization tailoring techniques include control and independent optimization of switchable HPDLC optical devices to meet the demanding requirements of anticipated applications for, inter alia, the telecommunications and display industries. These techniques include optimization of diffraction efficiency, i.e., index modulation, polarization dependence control, haze, cosmetic quality, control of response and relaxation time, voltage driving for on and off switching, and material uniformity. This control and independent optimization tailors properties of switchable HPDLC optical devices according to the specific requirements of the application of the switchable HPDLC optical device. The invention disclosed herein retains the desirable attributes of the multi-functional acrylate system for forming HPDLC optical
Red Dot Sights is a name for different groups of optical devices which enable the shooter to rapidly aim at targets at close range with one eye or even with both eyes opened. Magnification of dot sights is normally 1x or close to that. The simplest of this kind of optical aiming devices are small tube Riflescopes with 1x magnification. More advance are so called Reflex sights which are constructed as a single glass window with the aiming dot. All of the Dot sights have almost infinite eye relief and have a set parallax at approximately 40-60 meters.
An optical device includes a semiconductor element configured to emit emission light or to receive incident light, including a first fitting part including a portion having a convex shape in a first
Optical Phase Conjugation is a non-linear optical phenomenon that generates a phase conjugate replica of an incident beam. It has been widely used to suppress the effects of aberrations in optical systems such as resonators or imagetransmitting optical fibers. In this work, the possibility of using optical phase conjugation as a means of suppressing the effect of scattering in turbid media is analyzed, with the final aim to apply it to biological tissues. Firstly, light propagation through a slab representing a turbid sample was calculated by solving Maxwells equations with the Finite-Difference Time-Domain method, in order to preserve all the information about the phase and coherence of the wavefront. The non-linear process that takes place within the phase conjugation mirror is described by coupledwave theory. A set of simulations was performed, and the results confirm the feasibility of using this effect to compensate the effect of scattering in turbid media. Subsequently, an experimental ...
In an optical communication network in which a plural number of nodes are connected to each bidirectional broadcasting bus, and a node communicates with another using the packets, or an optical communication network in which a plural number of nodes are connected to a bidirectional broadcasting bus, and a node communicates with another using the packets, each node comprises carrier sensing means for sensing a carrier on the broadcasting bus, and jamming detecting means for detecting a jamming state of received signals.
Engineering. Science and Industry. M.Tech in Opto Electronics with specialization in Optical Communication Engineering in Madhya Pradesh. M.Tech in Opto Electronics with specialization in Optical Communication Engineering. Goal : To Establish the department as a Centre of Excellence in the area of optoelectronics and develop CENTER FOR PHOTONICS. Mission
An optical device includes a diode light source which is preferably in the form of an array of diode elements such as laser diodes or light emitting diodes (LEDs). The light emitted from the diode elements is directed towards a reflector which directs the emitted light through a heat sink member for controlling the temperature of the diode elements. The heat sink member preferably has a plurality of fins for dissipating heat, and the emitted light passes through these fins and away from the optical device. An optical lightguide may be integrated with the optical device to give the user better control over how the emitted light is imaged. The diode elements preferably emit in either the blue or ultraviolet region of the optical spectrum. In one embodiment of the invention, the output from the diode elements has a cross section that is variable in shape, permitting a composite material within a cavity of a tooth to be cured in such a way that microgaps between the tooth and the composite are not
Substrate for Optical Device - The present invention relates to a substrate for an optical device, which is configured to connect an optical element substrate and an electrode substrate in a fitting manner, and simultaneously, to form one or more bridge pads which are insulated from the optical element substrate by a horizontal insulating layer, on the optical element substrate. The substrate for an optical device according to a first aspect of the present invention comprises: an optical element substrate which is made of a metal plate and contains a plurality of optical elements therein; a pair of electrode substrates which are made of an insulating material to form a conductive layer on at least a portion of the upper surface thereof, are connected to both side surfaces of the optical element substrate, respectively, and are wire-bonded to the electrodes of the optical elements; and a fitting means which is formed on the side surfaces of the electrode substrate and the optical element ...
A method for producing a surface mounting optoelectronic component having comprises the following steps: readying a base body with the optoelectronic transmitter and/or receiver arranged in a recess of the base body, filling the recess of the base body with a transparent, curable casting compound, and placing the optical device onto the base body, so whereby the optical device comes into contact with the casting compound.
First and second carrier modulators each modulate a carrier having a different frequency from each other with a baseband input signal. First and second variable wavelength optical modulators each convert the modulated signal into an optical signal having a first or second wavelength. An optical multiplexer multiplexes the optical signals, and sends a multiplexed signal to an optical transmission line. A wavelength separator individually outputs wavelength components of the multiplexed signal. First and second optical receivers each convert these wavelength components into an electrical signal. First and second filters each pass only the signal components of each different frequency. First and second burst demodulators each demodulate the modulated signal. With such a structure, a large-capacity optical communication apparatus which is capable of simultaneously using the same wavelength without requiring wavelength management in optical transmitting circuits can be achieved at a low cost.
NASA and The Aerospace Corporation of El Segundo, California, have received confirmation the Optical Communications and Sensor Demonstration (OCSD) CubeSat spacecraft is in orbit and operational. OCSD launched aboard an Atlas V rocket Thursday from the Vandenberg Air Force Base in California.
Inquire for Optical Communication Equipments Sales Market Competitive Analysis, Trends and Forecast till 2022, with free sample copy of the report.
Channel estimation is a key technology for Wireless Optical Communication (WOC) systems. Based on the Training Sequence (TS), this paper ...
A semiconductor device is disclosed that comprises a base semiconductor portion and, thereon, first and second elevated semiconductor portions separated by a channel. The uppermost surface of the first elevated semiconductor portion carries a metal electrical contact layer and the uppermost of the second a dielectric layer. The surfaces defining the channel are substantially free of metal and dielectric. The structure can be used in a ridge waveguide laser, the first elevated semiconductor portion constituting the ridge. Distributed feedback corrugations may be incorporated in such devices or in other ridge waveguide structures.
There is described a sensor device which comprises light source means for emitting a light beam, photodetector means for receiving the light beam after passing through or being reflected within living
In this paper, we report a novel fabrication technique for integrated silicon waveguides and devices. Unlike conventional silicon-on-insulator (SOI) techno
Optical devices comprised of a bundle of micron-sized optical fibers. Used as a lens to transmit light or an image with high efficiency and low distortion. Unlike a normal optical lens, no focusing distance is required. Ideal when designing and building compact optical devices.
This project aims to develop a framework of requirements which support safe installation and operation of optical devices within an aircraft fuel tank, specifically: 1: To determine optical power and energy limits which ensure safe operation of optical installations within an aircraft fuel tank over aircraft life and under all phases of flight, taking the limits provided in IEC 60079-28:20015 as a starting point. 2: To demonstrate optical and electrical power and energy equivalences, where possible. 3: To determine requirements for optical installations, including bonding and electrostatic discharge for non-conductive components such as optical fibres. 4: To provide guidelines for analysis of the hazards presented by the typical internal components of optical devices, such as failure modes of photo diodes and cells ...
Medical optics is big business. The global market for medical device technologies is expected to reach $538.7 billion in 2018, registering a compound
An optical device such as the lens can be used for a variety of reasons:to transmit light which converges the light beam or refract light which diverges the light beam. Most lens are typically made from transparent material such as glass or plastic. The purpose of using such materials helps correct the direction of light needed in a specific situation. There are many types of lens but lets first discuss the construction of this optical device. The most abundant type of lenses is the spherical shape. There are two surfaces that are perpendicular to the axis of the lens. There can be a convex lens which looks like a bubble bulging outward or a concave lens which has an inward bulging bubble shapes. The next type of lens which is called the toric lens has 2 distinct radii of curvature that are perpendicular to each other. This creates a type of astigmatism which is where rays that propagate in two orthogonal planes have distinct foci.. Although these lenses may seem simple they do certainly become ...
The Scientific World Journal is a peer-reviewed, Open Access journal covering a wide range of subjects in science, technology, and medicine. The journals Editorial Board as well as its Table of Contents are divided into 81 subject areas that are covered within the journals scope.
both of which allege that Vermeer employed an optical device, the camera obscura, as an aid to his painting. Fascinated by the theories of Hockney and Steadman (both outsiders to the art history enclave), Jenison built his own camera obscura but found something was amiss. He immediately came to suspect that not only had Vermeer used some sort of optical device to trace the drawing of his motif onto his canvas (as Steadman had for all practical purposes proved) but must have used it to register the colors and tonal values of his paintings which have been long admired for their uncanny precision, apparently out of reach of his contemporaries.. While viewing in person Vermeers Music Lesson, perhaps the artists most "optically based" work, Jenison, a video engineer well versed in analyzing images scientifically, became firmly convinced that the work presents optical information that cannot be gathered by retinal observation. Pondering how Vermeer could have achieved such results, he invented-the ...
The optical device comprises at least two optical elements (M1, M2 ; L1, L2, L3 ; L1, M2) which are of variable focal length and include multilayer structures, at least one source of voltage (47) for the multilayer structures and electronic control means for controlling the voltage applied to the respective multilayer structures of the optical elements of variable focal length as a function of the magnification desired for the optical device.
Though they had been used as early as the 1850s on rifles, and even earlier for other tasks, until the 1980s, when optical device and assault rifle combinations such as the Austrian Steyr AUG and the British SUSAT mounted on the SA80, became standard issue, military use of telescopic sights was restricted to snipers because of the fragility and expense of optical components. Additionally the glass lenses are prone to breakage, and environmental conditions such as condensation, precipitation, dirt, and mud obscure external lenses. The scope tube also adds significant bulk to the rifle. Snipers generally used moderate to high magnification scopes with special reticles that allow them to estimate range to the target. Since the 1990s many other armed forces have adopted optical devices for general issue to infantry units and the rate of adoption has increased as the cost of manufacture has fallen. Telescopic sights provide some tactical disadvantages. Snipers rely on stealth and concealment to get ...
With advanced techniques to control the properties of surfaces, we can dynamically control their filter properties, which allow us to potentially create devices for high data-rate optical communication or smart contact lenses.. "The current challenge is that dielectric resonators only work for specific colours, but with our flexible surface we can adjust the operation range simply by stretching it.". Associate Professor Madhu Bhaskaran, Co-Leader of the Functional Materials and Microsystems Research Group at RMIT, said the devices were made on a rubber-like material used for contact lenses.. "We embed precisely-controlled crystals of titanium oxide, a material that is usually found in sunscreen, in these soft and pliable materials," she said.. "Both materials are proven to be bio-compatible, forming an ideal platform for wearable optical devices.. "By engineering the shape of these common materials, we can create a device that changes properties when stretched. This modifies the way the light ...
The monitoring of gases and vapors of industrial and environmental interest was addressed using guided wave technologies. Hybrid optical devices making use of fiber optics and microoptics were used as an optical platform, on which to deposit gas or vapor-sensitive innovative materials. These materials, based on metal-coordinated porphyrins, phthalocyanines and their blends, were functionalized so as to offer their dielectric constants reversibly modulated by the interaction with analytes. The optical platform fitted to an electro-optical scanner, allowed the sensitive materials to be spectrally interrogated in the whole or in selected bands of the visible spectral range, so as to achieve a gas- or vapor-modulated absorption spectroscopy signal.The optical sensors were exposed to CO, SO2, NO2 and NH3 in the 25-100 ppm range. The overall sensor response was processed by means of chemometric methodologies ...
Thin Film Optics. Physical processes giving rise to colour have always been of scientific interest. In everyday life, colour effects resulting from optical interference processes are found in examples as diverse as the oil film on water to the brilliancy of certain species of sea shell (Abalone) and butterfly (lepidoptera). At a technological level, optical thin films underpin a multitude of applications since they provide the means of processing light by the manipulation of amplitude, frequency, phase, polarisation, separately or in combination. Thin films are found in all optical systems ranging from the simplest lens to the most complex satellite imaging system. They are also appearing to an increasing extent in the consumer world, for example in novel decorative paints, art-work and as components of technology used to combat the profileration of counterfeit goods.. Within the defence environment, thin film optical devices also play an important role in determining the degree to which complex ...
According to a statement, the team from Harvards School of Engineering and Applied Sciences has cleared an important hurdle in the development of advanced materials that bend light in unconventional ways, known as metamaterials.. The group used extremely short and powerful laser pulses to create three-dimensional patterns of tiny silver dots within a material that are considered essential to making futuristic optical devices that appear to be invisible.. The fabrication process, described in the journal Applied Physics Letters, advances nanoscale metal lithography into three dimensions - and does it at a resolution high enough to be practical for metamaterials.. If you want a bulk metamaterial for visible and infrared light, you need to embed particles of silver or gold inside a dielectric and you need to do it in 3D with high resolution, said lead author Kevin Vora, a graduate student at the Harvard School of Engineering and Applied Sciences.. This work demonstrates that we can create ...
(Phys.org)-At a time when communication networks are scrambling for ways to transmit more data over limited bandwidth, a type of twisted light wave is gaining new attention. Called an optical vortex or vortex beam, this ...
The Artificial Intelligence (AI) and Machine Learning (ML) have attracted increasing research interests and are ubiquitously emerging at different levels within optical communication systems and networks. From physical signal transmission to networking, we have observed that the optical and wireless communication systems are becoming more and more complicated due to increasing data transmission speed, more dynamic and connections and more complicated use cases. With growing desirability for elastic services and software-defined systems & networks, network operators will need novel methods to manage their network operations. AI and ML have shown promising results for optimization, prediction and identification in systems that exhibit nonlinear, dynamic and complex behaviors. This could offer operational advantages by using AI and ML in a range of applications in optical communication systems and networks. For instance, recently studies have shown ML algorithms can improve the transmission performance by
16. High dimensional quantum key distribution with biphoton frequency combs through energy-time entanglement EI SCOPUS 作者:Sarihan, Murat Can ;Chang, Kai-Chi ;Cheng, Xiang ;Lee, Yoo Seung ;Zhong, Tian ;Zhou, Hongchao ;Zhang, Zheshen ;Wong, Franco N.C. ;Shapiro, Jeffrey H. ;Wong, Chee Wei 作者机构:[Sarihan, Murat Can ;Chang, Kai-Chi ;Cheng, Xiang ;Lee, Yoo Seung ;Wong, Chee Wei ] Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, Department of Electrical Engineering, University of California, Los Angeles; CA; 90095, United States;[Zhong, Tian ] Institute for Molecular Engineering, University of Chicago, Chicago; IL; 60637, United States;[Cheng, Xiang ] State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing; 100876, China;[Wong, Franco N.C. ;Shapiro, Jeffrey H. ] College of Optical Sciences, University of Arizona, Tucson; AZ, United States;[Zhou, Hongchao ;Zhang, Zheshen ] Shandong University, ...
This paperback reprint of a classic book deals with all phases of light, color, and color vision, providing comprehensive data, formulas, concepts, and procedures needed in basic and applied research in color vision, colorimetry, and photometry ...
Author(s): Kenneth W. Allen, Farzaneh Abolmaali, Joshua M. Duran, Gamini Ariyawansa, Nicholaos I. Limberopoulos, Augustine M. Urbas and Vasily N. Astratov. Journal Title: Applied Physics Letter. Date: Appl. Phys. Lett. 108, 241108 (2016) Published online 15 June 2016. DOI: http://dx.doi.org/10.1063/1.4954190. ...
A communications adaptor card is disclosed herein. One embodiment of the communications adaptor card comprises, a printed-circuit board, the printed circuit board having at least one keep-out area, the at least one keep-out area configured to accept a multi-contact electrical connector receptacle and at least one optical module attached to the printed circuit board. The at least one optical module can be attached to the printed circuit board substantially within the at-least-one keep-out area.
The OFC Conference is indisputably the worlds leading global conference and exposition for optical communications and networking professionals. Attend OFC and be part of the event that brings together the people, products, and information that drive optical communications and networking.
Ever since Roman glass blowers made the Lycurgus cup, some 2,400 years ago, researchers and engineers have figured out to do all kinds of things with light, be it in optical fiber communications; the use of lasers for welding, cutting and surface modification of materials; photonic gyroscopes in aviation; or optical switches in computing. As a general field of science, photonics defines the knowledge devoted to the generation, transmission, detection, control and handling of light. One sub-domain, nanophotonics deals with the manipulation and emission of light using nanoscale material and devices. One of the sizzling hot topics within nanophotonics is plasmonics, which holds the promise of a class of subwavelength-scale optoelectronic components that could form the building blocks of a chip-based optical device technology that is scaleable to molecular dimensions. Here, we report on the latest achievements of a Spanish-French group of researchers that brings the exiting concept of an optically ...
According to one aspect of the present invention, an apparatus for optically combining light beams is disclosed. The apparatus includes a set of prism shaped doorways configured to receive output beams from at least one optical device. Each of the plurality of doorways has a common refractive index. The apparatus also includes a set of spherical mirrors disposed substantially parallel to the plurality of doorways. Each mirror is associated with one of the plurality of doorways. The apparatus further includes a boundary layer disposed between the set of doorways and the set of mirrors. The boundary layer has a refractive index greater than the common refractive index of the plurality of doorways. The common refractive index of the set of doorways and the refractive index of the boundary layer are configured to change the angle of each of the received output beams to combine the set of received output beams into a single output beam.
Various functional optical devices are integrated on a single chip in order to construct optical current transducers based on polarization rotated reflection interferometry, which consists of polarization maintaining 3-dB couplers, TE-pass polarizers, TE/TM polarization converters, and thermo-optic phase modulators. By virtue of the device integration, the sensor exhibited good linearity, and excellent accuracy with an error less than 0.2%. The integrated-optic device provides inherent polarization maintaining characteristics and precise controllability of the optical path length in the interferometric sensor. Single chip integration reduces the complexity of the interferometry, and enables mass-production of low-cost high performance current sensors.. ©2011 Optical Society of America. Full Article , PDF Article ...
We present a fully planar integrated optofluidic platform that permits single particle detection, manipulation and analysis on a chip. Liquid-core optical waveguides guide both light and fluids in the same volume. They are integrated with fluidic reservoirs and solid-core optical waveguides to define sub-pic
In the field of optics, a homogenizer is an optical device that makes the light beam from a laser or lamp source more uniform in its intensity across its cross-section to enable the light source to provide a more uniform illumination on a surface. Use of a homogenizer in an illumination system is important in consumer applications such as light projectors for movies and industrial applications such as imaging equipment for microlithography for production of semiconductor microchips. Such homogenizers are also called beam homogenizers or beam uniformizers. The main principle in their design approach is to divide the light beam cross-section-wise into multiple segments and then overlap these segments of different intensities into a recombined beam of improved uniformity. A variety of optical homogenization devices have been developed, including flys-eye lens arrays, hollow and solid light tunnels, beam-folding wedged mirrors and split prisms. ...
Small optical devices are important for diagnostic imaging in the body; they serve, for example, as optical probes in blood vessels or the gastrointe
Recent advances in devices and applications of high-birefringence fiber loopmirror sensors are addressed. In optical sensing, these devices may be used as strain andtemperature sensors, in a separate or in a simultaneous measurement. Other describedapplications include: refractive index measurement, optical filters for interrogate gratingsstructures and chemical etching control. The paper analyses and compares different types ofhigh-birefringence fiber loop mirror sensors using conventional and microstructured opticalfibers. Some configurations are presented for simultaneous measurement of physicalparameters when combined with others optical devices, for example with a long periodgrating.