1928 results about "Single fiber" patented technology

Controls for an optical scanner, such as a single fiber scanning endoscope (SFSE) that includes a resonating optical fiber and a single photodetector to produce large field of view, high-resolution images. A nonlinear control scheme with feedback linearization is employed in one type of control to accurately produce a desired scan. Open loop and closed loops controllers are applied to the nonlinear optical scanner of the SFSE. A closed loop control (no model) uses either phase locked loop and PID controllers, or a dual-phase lock-in amplifier and two PIDs for each axis controlled. Other forms of the control that employ a model use a frequency space tracking control, an error space tracking control, feedback linearizing controls, an adaptive control, and a sliding mode control.

A fiber optic transceiver adapted for use in an optical fiber data transmission system is capable of detecting reflection problems in fiber optic links and providing information related to the distance to the point of reflection. The fiber optic transceiver contains a fiber interface, a receiver, a transmitter, and a microcontroller. The microcontroller controls the transmitter to modulate the laser power to transmit impulse test data and the transceiver includes circuitry and microcode to detect reflection due to fiber connection problems. This enables trouble shooting during installation and/or reconfiguring the connection automatically, in response to a connection problem, and provides a physical layer link.

An inlet device is described for inserting a cable containing optical fibers into a telecommunications enclosure. The inlet device includes a housing with a strength member securing section configured to fasten at least one strength member to the housing. The inlet device further includes a fiber guide device. The inlet device may be used in a single fiber optical cable assembly or multi-fiber optical cable assembly. A method for preparing a cable assembly is described. A telecommunications enclosure including an inlet device is also described.

The present invention provides an aggregate of nanofibers having less spread of single fiber fineness values that can be used in wide applications without limitation to the shape and the kind of the polymer, and a method for manufacturing the same. The present invention is an aggregate of nanofibers made of a thermoplastic polymer having single fiber fineness by number average in a range from 1×10⁻⁷ to 2×10⁻⁴ dtex and single fibers of 60% or more in fineness ratio have single fiber fineness in a range from 1×10⁻⁷ to 2×10⁻⁴ dtex.

A new optical sensing device containing fiber Bragg gratings, a scanning bandpass filter, an interferometer and multiple photodetectors is disclosed. The present invention also describes a new system and method for fibre Bragg grating (FBG) sensor interrogation and multiplexing. The new system combines a scanning Fabry-Perot (SFP) bandpass filter used to wavelength-multiplex multiple gratings in a single fiber, and an unbalanced Mach-Zehnder fibre interferometer made with a 3x3 coupler to detect strain-induced wavelength shifts. A passive technique for interferometer drift compensation using non-sensing FBGs is included in the system. A complete prototype system interrogates four gratings in a single fiber at a Nyquist sampling rate up to 10 kHz, with a noise floor measured near 4 nepsi Hz-½ above 0.1 Hz. The inclusion of the interferometer drift compensation technique is shown to make quasi-static measurements feasible.

A filter media is formed from electrospun fine fibers and coarse fibers which are entangled and integrated together into a single fiber composite filter media layer.

Disclosed is an improved optical fiber that employs a novel coating system. When combined with a bend-insensitive glass fiber, the novel coating system according to the present invention yields an optical fiber having exceptionally low losses.

The coating system features (i) a softer primary coating with excellent low-temperature characteristics to protect against microbending in any environment and in the toughest physical situations and, optionally, (ii) a colored secondary coating possessing enhanced color strength and vividness.

The improved coating system provides optical fibers that offer significant advantages to single-fiber drop cables, such as those employed for Multiple Dwelling Unit (MDU) applications.

A serial transmission protocol and architecture are provided that can be used to forward remote control data between sink (e.g., DTV) and source (e.g., DVD player) devices, in addition to other data such as video and/or audio or other payload. The target device need not be in the line of sight of the remote control beam. Daisy-chained devices will pass the remote control signal to the appropriate target device, so that the user can point any remote control at the DTV or other conveniently located device in the system, and still control the actual target device. The communication channel that carries payload, processing control, and remote control data can be implemented with wired or wireless of technology (or a combination thereof). In one particular embodiment, the communication channel is implemented with a single fiber. A number of presentation and entertainment system applications that employ remote control technology (e.g., home theater, audio, and computer implemented systems) can benefit from embodiments of the present invention.

The invention provides a monomode optical fiber having, at a wavelength of 1550 nm: an effective section area greater than or equal to 60 mum2; chromatic dispersion close to 8 ps/(nm.km); a chromatic dispersion slope of absolute value less than 0.07 ps/(nm2.km). In the range of wavelengths used in a WDM transmission system, typically 1530 nm to 1620 nm, the fiber has chromatic dispersions greater than 7 ps/(nm.km), thereby making it possible to limit non-linear effects. The invention also provides a WDM optical fiber transmission system using such a fiber as a line fiber. The small slope of its chromatic dispersion is an advantage in such a system.

An optical fiber suitable for use in a single fiber or multifiber optical connector or array is structured with a core region and a cladding region surrounding the core region, and exhibits a bending loss of a fundamental mode of the fiber at a wavelength λ is lower than 0.1 dB/m at a diameter of 15 mm, a mode-field diameter of the fundamental mode at an end of the fiber at the wavelength λ is between 8.0 μm and 50 λ, and a bending loss of a first higher-order mode at the wavelength λ is higher than 1 dB/m at a diameter of 30 mm. The fiber may be multistructured, wherein the cladding region comprises a main medium and a plurality of sub medium regions therein to form a spatially uniform average refractive index.

This invention provides compound solutions, emulsions and gels excellent in homogeneous dispersibility and long-term dispersion stability and also excellent in the properties as cosmetics, using disarranged nanofibers not limited in either form or polymer, widely applicable and small in the irregularity of single fiber diameter. This invention also provides a method for producing them. Furthermore, this invention provides synthetic papers composed of fibers, small in pore area and uniform in pore size, using disarranged nanofibers, and also provides a method for producing them. This invention provides compound solutions, emulsions, gels and synthetic papers containing disarranged nanofibers of 1 to 500 nm in number average diameter and 60% or more in the sum Pa of single fiber ratios.

A method and apparatus use a photonic-crystal fiber having a very large core while maintaining a single transverse mode. In some fiber lasers and amplifiers having large cores problems exist related to energy being generated at multiple-modes (i.e., polygamy), and of mode hopping (i.e., promiscuity) due to limited control of energy levels and fluctuations. The problems of multiple-modes and mode hopping result from the use of large-diameter waveguides, and are addressed by the invention. This is especially true in lasers using large amounts of energy (i.e., lasers in the one-megawatt or more range). By using multiple small waveguides in parallel, large amounts of energy can be passed through a laser, but with better control such that the aforementioned problems can be reduced. An additional advantage is that the polarization of the light can be maintained better than by using a single fiber core.

A system and method is disclosed for generating, propagating, and detecting light pulses for use with a fiber optic transducer array. The system preferably uses two pulses to provide fixed and relatively short interferometer path differences to thereby reduce coherent light noise. The system preferably uses a surface acoustic wave device for chirping the light pulses to thereby spread noise over a wider bandwidth so as to suppress noise. A coherent light source is preferably amplitude modulated to produce an initial pulse. In one embodiment, that initial pulse is chirped and split into two pulses. One of the two pulses is delayed while the other is frequency shifted. The two pulses are combined onto a single fiber optic path and applied to the fiber optic transducer array. After being acted on by the fiber optic transducer array, the two pulses are photodetected and processed to obtain the information about the physical phenomena to be detected.

Disclosed herein is a wiping sheet composed of two pieces of spunlace nonwoven fabrics containing heat-shrinkable fiber which are fusion-bonded together with fusion-bonding lines which extend in the cross direction perpendicular to the machine direction. The fusion-bonding lines are formed such that their pitch in the machine direction is shorter than one half of the fiber length so that each fusion-bonding line intersects a single fiber at 3 or more points. This structure prevents surface fluffing and imparts a high surface frictional strength and a high bending resistance for comfortable wiping work.

A ganged connector housing Is configured to receive a plurality of single-fiber connectors. Each connector is removably retainable at a respective location in the connector housing. Each single-fiber connector comprises a ferrule configured to receive and retain a single multicore fiber. The single-fiber connectors have a high-density packing footprint within the connector housing. Each single-fiber connector and its respective ferrule is configured to enable individual repositioning, tuning, alignment, repair or replacement of a respective multicore fiber terminated therein, independent of other optical fibers within the plurality of single fiber ferrules, and without requiring replacement of the entire set of multicore fibers.

A solution for detecting and recovering from a failure in a protected single-fiber passive optical network. A detector is used to detect the degradation in power level of optical signals. Furthermore, the invention discloses a variable symmetric split ratio approach to improve the number of splits (e.g. the number of ONUs). A single-fiber passive optical network is disclosed that uses a plurality of passive nodes connected in the optical fiber between the interfaces, wherein in the passive nodes 2-by-2 splitters/combiners are used to couple optical power from and into the optical fiber at a predetermined split ratio.

An apparatus and method for ultrafast real-time optical imaging that can be used for imaging dynamic events such as microfluidics or laser surgery is provided. The apparatus and methods encode spatial information from a sample into a back reflection of a two-dimensional spectral brush that is generated with a two-dimensional disperser and a light source that is mapped in to the time domain with a temporal disperser. The temporal waveform is preferably captured by an optical detector, converted to an electrical signal that is digitized and processed to provide two dimensional and three dimensional images. The produced signals can be optically or electronically amplified. Detection may be improved with correlation matching against a database in the time domain or the spatial domain. Embodiments for endoscopy, microscopy and simultaneous imaging and laser ablation with a single fiber are illustrated.

This invention provides a kind of twin-core single fiber light probe which is used to seize minute particle and its preparation method. It includes the fiber, the said fiber is win-core fiber which includes two individual fiber cores in fiber public cladding, one end of the fiber is fused probe and the sintered cone fiber tip, and one end of the cone fiber tip has lenticule. The twin-core fiber light probe in this invention has two optical conversion section, one is twin-beam across lange-angle derivation collection section, changes the transmit direction of light wave in each fiber core of the twin-core fiber by the cone fiber whose cone angle change quickly, to lead the two beam to the tip end of the cone fiber; the other is light field compression section which forms large grads light field, realizes the light field compression of two beam by the lenticule in fiber tip end. The twin-core fiber light probe provided in this invention can be used for seizing the live biologic cell or the fixation, transpor and assembly of minute particles.

A single fiber full-field optical coherence tomography (OCT) imaging probe (300) includes a hollow tube (301), and a single fiber (305) disposed within the tube for transmitting light received from a broadband light source to a beam splitter (350) in the tube optically coupled to the single fiber (305). The beam splitter (350) splits the light into a first and a second optical beam, wherein the first beam is optically coupled to a reference arm including a MEMS reference micromirror (335) which provides axial scanning and the second beam is optically coupled to a sample arm for probing a sample to be imaged. Both the reference arm and the sample ami are disposed in the tube. A photodetector array (315) is preferably disposed inside the tube (301) optically coupled to the beam splitter (350). The photodetector array (315) receives a reflected beam from the MEMS reference micromirror (335) and a scattered beam from the sample to form an image of the sample.

The resin in a fiber-reinforced resin material that uses a single fiber reinforcing ply or a number of fiber reinforcing plies for reinforcing the resin material is reinforced by dispersing carbon nanofibers therein, whereby a fiber-reinforced composite resin material having improved strength such as compressive strength is provided. In a carbon nanofiber-dispersed resin fiber-reinforced composite material 1, an uncured resin 4 having carbon nanofibers 5 dispersed therein is impregnated into a number of fiber reinforcing plies 2a laid one upon another. Upon curing the resin 4, the strength of the matrix 3 itself is increased through the carbon nanofibers 5 dispersed in the resin 4. Moreover, the fiber reinforcement 2 and the resin 4 are joined together strongly by the carbon nanofibers 5, and hence the strength of the composite material, for example the compressive strength, which hitherto has been dependent on the strength of the resin 4 only, is improved.

The invention discloses a rotor spinning melange yarn forming method and device and product. On a rotor spinning machine, two or more fiber strips enter a feeding mechanism through a striping gate and a horn mouth, the feeding mechanism contains at least two independently controlled feeding rollers and can control the independent feeding of at least two fiber strips, different fiber strips are of different colors, or of different color combinations, or of different fiber components, the feeding speed of each fiber strip is controllable, the feeding can be conducted at different time sections, and the feeding speeds of all the fiber strips are independently changeable or simultaneously changeable; through the implement of continuous constant-speed feeding or segmentation variable speed feeding of different fiber strips, continuous constant feeding or segmentation variable feeding of the fiber strips is controlled; the fed fiber strips break away from a combing roller, are transferred to a delivery pipe, and then enter a spinning cup depending on the centrifugal force of the combing roller and the action of added air flow after the opening and carding actions of the combing roller; single fibers of different components are mixed, condensed and twisted in the spinning cup to form rotor spinning melange yarn blended by monochrome or polychromatic fiber, or with segmentation color effect, uniform linear density or changing linear density.