137results about How to "Reduce optical power" patented technology

A backlight apparatus (and light guide and liquid crystal display apparatus incorporating the same) includes a wedge-type light guide having a refractive index n1, and having a top surface, a bottom surface and a side surface, a light source for directing light to the side surface of the wedge-type light guide, a first light transmission layer having a refractive index n2, which is smaller than said refractive index n1, and having a top surface and a bottom surface, wherein the top surface of the first light transmission layer is attached to the bottom surface of the wedge-type light guide, and a light deflecting layer having a top surface attached to the bottom surface of the first light transmission layer for deflecting the incident light from the first light transmission layer toward the top surface of the wedge-type light guide.

A monitor for monitoring OSNR of data being carried via an optical network link, the monitor obtains an optical signal from the link, comprises a loop of a non-linear optical medium capable of producing a back reflected signal to the optical signal and of looping the back reflected signal; and comprises a device for extracting a portion of the looped back reflected signal from said loop. The monitor further comprises a first photodetector for measuring power of the optical signal and a second photodetector for measuring power of the extracted portion of the looped signal. Finally, there is a processing unit for determining OSNR of the optical signal based at least on readings of the first and the second photodetectors.

Passive optical networks have optical budget loss limitations that affect the ability of a Service Provider to serve a limited number of clients over a limited range. The deployment of passive optical networks is constrained by potential physical rights of way issues. A method and system for augmenting communication links of a passive optical network are disclosed which utilize radio frequency communication enabling an increase in the number of clients on the network as well as increasing the reach or range of the network while potentially eliminating physical rights of way issues.

Passive optical networks have optical budget loss limitations that affect the ability of a Service Provider to serve a limited number of clients over a limited range. The deployment of passive optical networks is constrained by potential physical rights of way issues. A method and system for augmenting communication links of a passive optical network are disclosed which utilize radio frequency communication enabling an increase in the number of clients on the network as well as increasing the reach or range of the network while potentially eliminating physical rights of way issues.

A transmission wavelength band in an optical transmission line is divided into a plurality of sub-bands and signal lights or an ASE dummy light is disposed per sub-band as a unit. The optical power of the ASE dummy light in each sub-band is controlled so as to realize the gain profile at a full implementation in the optical transmission line. While new signal lights are being added, the optical power of whole ASE dummy lights or the optical power of the ASE dummy lights in sub-bands adjacent to the sub-band in which the new signal lights are to be added is controlled while increasing the optical power of the new signal lights so that the transmission characteristics of the existing signal lights are not affected by the signal addition.

An embodiment is directed to a system for dissipating cladding modes of an optical fiber. In the system, a high power light source couples optical power into the optical fiber at a fiber coupling point thereby producing the cladding modes; material is indexed-matched to the optical fiber and is optically contacted to the optical fiber near the fiber coupling point; and a substrate layer is operable to provide a thermal sink for heat generated from dissipation of cladding modes of the optical fiber.

The present invention provides optical compensation for a submarine optical cable optical. A dummy light module generates a dummy light signal according to a continuous spectrum in a predetermined range and a combining module combines a service signal with the dummy light signal. When the dummy light is used for the compensation, conventional problems are solved, including complicated control, difficult realization of the pre-equalization function and inflexible configuration. When service signals are increased, the adjustment for the power of the dummy light signal is avoided; therefore, the control for the dummy light is simplified. In the pre-equalization operation, power control is only performed on the dummy light signal in the single channel or the continuous dummy light signal; therefore, the realization of the pre-equalization function is easy.

An LED lamp structure includes a lamp body, a plurality of LED chips, a lens, and an expansion structure. The lamp body has a front side formed with a recess and a rear side formed with a plurality of radiating fins. A positive and a negative conducting wire are provided in the recess, and a metal foil is arranged between the positive and the negative conducting wire. The LED chips are mounted on the metal foil and electrically connected to the positive and negative conducting wires through wire bonding, so as to electrically connect to a plurality of wiring junctions. An encapsulating material is filled in the recess to complete packaging of the LED chips. The lens is mounted to the front side of the lamp body. A plurality of the lamp bodies can be connected side-by-side, end-to-end and / or back-to-back via the expansion structure to expand the LED lamp structure.

The embodiment of the invention provides a system for detecting sub-optical fibers, comprising a main optical fiber, a light splitting module and multiple sub-optical fibers, wherein the light splitting module comprises at least one light splitter; each port of the light splitting module is provided with an optical film which is used for carrying out bandpass filtering on optical signals sent to the ports of the light splitter in accordance with a preset rule, and the optical films can cause pass bands of test links corresponding to sub-optical signals to be different; test equipment is used for selecting test wavelength sub-bands which are matched with the optical films of the ports of the light splitter in testing light spectrums in accordance with ports of the light splitter corresponding to to-be-tested sub-optical fibers, sending test signals corresponding to the selected test wavelength sub-bands to the ODN, receiving reflected signals which are formed by reflecting the test signals on the corresponding sub-optical fibers and acquiring the channel characteristics of the to-be-tested sub-optical fibers in accordance with the reflected signals. The embodiment of the invention also provides a method for detecting the sub-optical fibers, an ODN (optical distribution network) and an optical splitter.

A backlight apparatus (and light guide and liquid crystal display apparatus incorporating the same) includes a wedge-type light guide having a refractive index n1, and having a top surface, a bottom surface and a side surface, a light source for directing light to the side surface of the wedge-type light guide, a first light transmission layer having a refractive index n2, which is smaller than said refractive index n1, and having a top surface and a bottom surface, wherein the top surface of the first light transmission layer is attached to the bottom surface of the wedge-type light guide, and a light deflecting layer having a top surface attached to the bottom surface of the first light transmission layer for deflecting the incident light from the first light transmission layer toward the top surface of the wedge-type light guide.

An accommodating intraocular lens includes a haptic assembly and a flexible optic. The haptic assembly includes an anterior ring, a posterior ring, anterior spring arms, and posterior spring arms, wherein the anterior spring arms and the posterior spring arms bias the anterior ring and the posterior ring apart from one another. The flexible optic is suspended between the anterior ring and the posterior ring and connected to the haptic assembly by a plurality of support struts. The support struts are adapted to deform the flexible optic upon axial compression of the haptic assembly so that an optical power of the flexible optic is reduced relative to an uncompressed state of the haptic assembly.

A mode locked fiber laser system is arranged to have a lasing bandwidth and having a linear cavity, the cavity including a gain medium, a saturable absorber having a saturation power, and a filter having a spectral response, wherein the mode locked fiber laser system is arranged so that substantial CW mode locked operation is obtainable with less than 3 times the saturation fluence impinging on the saturable absorber.

The invention relates to a multi-fiber core single-mode optical fiber and a manufacturing method thereof. The multi-fiber core single-mode optical fiber comprises claddings and a plurality of fiber cores. The multi-fiber core single-mode optical fiber is characterized in that the fiber cores include a pumping fiber core and a plurality of signal fiber cores, wherein the pumping fiber core is arranged in the center of the optical fiber, the signal fiber cores are distributed on one to three circumferences around the center at equal intervals, so as to form one to three layers of signal fiber cores, sunken claddings tightly cover each signal fiber core, and common claddings are arranged outside the sunken claddings. The multi-fiber core single-mode optical fiber has the characteristics of low signal crosstalk among all of the signal fiber cores, easiness in online light amplification, simplicity and convenience in manufacturing and low manufacturing cost and is suitable for large-scale production. A distributed Raman amplification technique of the multi-fiber core single-mode optical fiber is used in an ultrahigh-speed communication system, so that effective light amplification can be realized, and the harm of a non-linear effect to the performance of a high-speed optical transmission system is further reduced.

The system comprises a high resolution camera (1) mounted above a conveyor plane (4) along which objects are displaced, thereby enabling the top face of each object to be observed. The camera (1) is fitted with an objective lens system (5) having a motor-driven focusing system that operates in association with a pickup (8) that produces a signal (S) representative of the vertical profile of the top face of each object relative to the conveyor plane. The profile signal serves to produce positioning references (C) for the focusing mechanism in order to take account of variations in the height of the top face of each object while that object is moving beneath the objective lens system of the camera. Such an image acquisition system is employed to read addresses automatically from postal packets for the purpose of performing automatic sorting.

Methods, devices, and systems for reprofiling a surface of a cornea of an eye ablate a portion of the cornea to create an ablation zone with an optically correct central optical zone disposed in a central portion of the cornea, and a blend zone disposed peripherally to the central optical zone and at least partially within an optical zone of the eye. The blend zone can have an optical power that gradually diminishes with increasing radius from the central optical zone.

A rapid frequency shift device and method for a semiconductor laser. The device includes a DBR laser, a reshaping mirror, a Faraday isolator, a half wave plate, a polarization beam splitter, a bi-pass AOM optical path, a saturated absorption optical path, a photoelectric detector, a phase locking demodulator circuit, a PID feedback circuit, a DDS signal generation circuit, a microcontroller, an analog-digital conversion circuit, a digital-analog conversion circuit and a laser current temperature control circuit. According to the invention, the rapid frequency shift of the DBR laser can be realized while the locking state is kept, the bi-pass AOM optical path is applied in a frequency-stabilized optical path, so that the luminous power loss of the main optical path for cooling is greatly reduced; the frequency precompensation technology is adopted to realize rapid frequency shift and remarkably lower the requirement of the rapid frequency shift for system feedback bandwidth, and besides, the design difficulty of the feedback circuit is reduced, the design is changed to be simple, economic and easy to realize, so that the wide-range rapid tuning can be realized even though the feedback bandwidth is lower.

A monitoring module for monitoring an electric arc machining process includes a camera, a photo flash lamp and a control system that controls the photo flash lamp in such a way that it illuminates when the camera records the image. The components are arranged in a common housing. The common housing includes a compressed air connection and an air outlet (7) or a deflection device arranged at the housing, which is provided for the orientation of the discharging air beam across the optical axis of the camera. Furthermore, an air flow caused by the compressed air is led via the light source and / or the control system and / or a charging connection for the light source.

A transmission wavelength band in an optical transmission line is divided into a plurality of sub-bands and signal lights or an ASE dummy light is disposed per sub-band as a unit. The optical power of the ASE dummy light in each sub-band is controlled so as to realize the gain profile at a full implementation in the optical transmission line. While new signal lights are being added, the optical power of whole ASE dummy lights or the optical power of the ASE dummy lights in sub-bands adjacent to the sub-band in which the new signal lights are to be added is controlled while increasing the optical power of the new signal lights so that the transmission characteristics of the existing signal lights are not affected by the signal addition.

Coated optical fibers and related apparatuses, links, and methods for optically attenuating light directed to or from optical fibers are disclosed. In one embodiment, an optical fiber includes an optical fiber end. The optical fiber end may be a source end and / or a detector end, and may be angle-cleaved. A coating material is disposed on at least a portion of the optical fiber end and configured to optically attenuate a portion of light directed to the optical fiber end. The material type of the coating material and / or the thickness of the coating material may be selectively controlled to control the amount of optical attenuation. The thickness of the coating material may also be controlled to provide the desired thickness of coating material onto at least a portion of the optical fiber end. The coating material may also be selectively patterned to improve the bandwidth of a multi-mode optical link.

The invention provides a light-emitting unit and a sideward light emitting type liquid crystal display with the light-emitting unit. The light-emitting unit comprises a first light-emitting assembly. The first light-emitting assembly comprises a substrate and an LED packaging body arranged on the first surface of the substrate. The light-emitting unit further comprises a second light-emitting assembly. The second light-emitting assembly comprises a transparent pipe and quantum dot material. The transparent pipe comprises pipe walls which include the arc-shaped inner wall and the arc-shaped outer wall, and a pipe cavity defined by the arc-shaped inner wall. The pipe walls extend in the direction parallel to the first surface. The side, facing towards the substrate, of the arc-shaped outer wall is in a wavy shape. The wavy shape is symmetrical with the perpendicular face, passing through the central light-emitting point of the first light-emitting assembly and perpendicular to the first surface, as the symmetrical face. The pipe cavity is formed along the symmetrical face. The quantum dot material is arranged in the pipe cavity. The side, facing towards the substrate, of the arc-shaped outer wall is in a wavy shape, and therefore the light receiving area of quantum dots is enlarged, the utilization rate of the quantum dots is increased, the luminous efficacy of the light-emitting unit is improved, and work stability of the quantum dots is improved.

A method of processing data from a distributed fibre-optic interferometric sensor system for measuring a measurand, the system comprising multiple interferometric sensors. The method comprises interrogating two or more of the multiple interferometric sensors to record a raw measurement time series for each of the sensors. The method further comprises calculating a common reference time series as a measure of central tendency of the raw measurement time series from two or more reference sensors, the reference sensors being selected from the multiple interferometric sensors. Finally, the method comprises compensating at least one raw measurement time series from a measurement sensor selected from the multiple interferometric sensors with the common reference time series to produce a compensated measurement time series, the measurement sensor being configured to be sensitive to the measurand. The invention further relates to a distributed fibre-optic interferometric sensor system.

An optical communication unit has a pair of cable-side communication units provided for a full duplex communication system connected to each other with a pair of optical fiber cables, has apparatus-side communication units provided for full duplex communication system directly connected to the cable-side communication units respectively each to form a closest contact state therebetween, and provides controls for a speed to double speed in full duplex system by using an infrared ray IR between the closely contacted units.

Methods, devices, and systems for reprofiling a surface of a cornea of an eye ablate a portion of the cornea to create an ablation zone with an optically correct central optical zone disposed in a central portion of the cornea, and a blend zone disposed peripherally to the central optical zone and at least partially within an optical zone of the eye. The blend zone can have an optical power that gradually diminishes with increasing radius from the central optical zone.

A computer input apparatus is disclosed which has improved safety control. The computer input apparatus includes a calibration circuit to control the operation current of a coherent light source to be above a minimum threshold required for normal operations, but below an upper threshold for safety reason. The computer input apparatus includes a fault detection circuit to monitor fault conditions. When this computer input apparatus employs a coherent light source, it does not require any optical lens to diminish optical power.

This invention relates to one light diode of current streghening window layer structure in semiconductor photo electricity technique, which comprises top electrode, current extensive layer, top limit layer, source area, down limit layer, buffer layer, underlay, down electrode, DBR reflection layer, wherein, the top electrode ad current extensive layer are set with conductive transparent layer; the current block layer is set on or down extensive layer to form current transporting window layer by transparent layer, current extensive layer and current block layer.

The invention provides a CCD device quantum efficiency measuring device and method. The device comprises a CCD device absolute quantum efficiency measuring apparatus and a CCD device relative quantum efficiency measuring apparatus, the CCD device absolute quantum efficiency measuring apparatus is used for measuring the absolute quantum efficiency of a CCD device on a 632.8 nm wavelength point, and the CCD device relative quantum efficiency measuring apparatus is used for measuring the relative quantum efficiency of the CCD device within the wavelength range from 300 nm to 1100 nm. According to the CCD device quantum efficiency measuring device and method, a 632.8 nm laser is used for emitting light into an integrating sphere to carry out absolute calibration after the light passes through a power stabilizing system, lasers with different levels of output power can be selected according to different CCD devices, the problem that optical power is low is avoided, no light loss is caused, a standard detector directly traces the source to a low-temperature radiometer on the 632.8 nm wavelength point, and therefore the number of intermediate links is reduced, and uncertainty of measurement is improved.

A method for realizing horizontal stress sense based on double mode photon crystal optical fiber includes coupling output light of laser into zero double refraction or high double refraction and double mode photon crystal optical fiber by horizontal dislocation mode after said output light passes through polarization controller, setting double mode photon crystal optical fiber in force receiving unit for sensing horizontal stress exerted from outside, utilizing far field light spot to detect space light field formed by double mode interference for obtaining detection result of horizontal stress. The system for realizing said method is also disclosed.

An electroabsorption modulated laser (EML) which uses coupling for chirp correction is disclosed.

The laser machining method involves the following steps: A) using a laser source to generate a laser beam at an initial wavelength of between 700 and 1200 nanometers and formed of a succession of laser pulses (10); B) doubling the frequency of part (12) of the laser beam using a non-linear crystal; C) varying the power during each emitted laser pulse (10) so that the power profile over the period of this laser pulse has, in an initial sub-period (T1), a maximum power peak or a pulse part with a maximum power and, in an intermediate sub-period (T2), of duration longer than the initial sub-period, a power lower than said maximum power over all of this intermediate sub-period. The power of the laser is varied in such a way that the maximum power has a value at least twice as high as the mean power over the period of the laser pulse and that the rise time taken to increase to a maximum power from the start of each laser pulse is shorter than 0.3 milliseconds. The machining method relates in particular to the welding of highly reflective metals such as copper, gold, silver or an alloy containing one of these metals. The intention also relates to a laser machining installation for implementing the method described hereinabove.

The invention discloses an optical module, which adopts a separation structure according to different optical power attenuation requirements and comprises a first lens assembly and a second lens assembly, wherein the top of the first lens assembly is provided with a filter, the filter is provided with an optical fiber interface on the side away from the light incoming surface, optical signals fromthe optical fiber interface are transmitted to the filter and reflected, and the reflected light is transmitted into a light receiving chip array located at the bottom of the second lens assembly. The top of the first lens assembly forms a reflecting surface, optical signals emitted by the laser chip array are transmitted to the reflecting surface and reflected, and the reflected light is emittedfrom a light emitting surface and enters an optical fiber interface in the second lens assembly. The optical signal power attenuation degree of the first lens assembly is greater than that of the second lens assembly, so that the first lens assembly can attenuate the optical power of the optical signals emitted by the laser chip array, the optical power finally coupled into the optical fiber interface is enabled to be consistent with the optical power required by the optical fiber interface, and the optical coupling effect is ensured.