1170 results about "Optical intensity" patented technology

The invention provides an optical switch and modulator which uses a closed loop optical resonator. The optical resonator is a dielectric cavity whose primary function is to store optical power. Various structures are possible, and a particularly advantageous one is a ring shaped cavity. The wavelength response at the output port of a ring resonator side coupled to two waveguides is determined by the details of the resonator, and the coupling between the resonator and the waveguides. By coupling to adjacent resonators, the modulator response can be improved over that of a single resonator. One such improvement is in modulator efficiency, which is defined as the ratio of the change in optical intensity at the output, to a change in absorption in the ring waveguides. Absorption is used for switching and modulation without incurring significant optical attenuation. Another improvement involves making the resonance insensitive to small deviations in wavelength or index change. The latter improves fabrication tolerances and compensates for possible drift of the signal wavelength. Collectively, the behavior of multiple coupled resonators yields higher order responses.

A method of processing data associated with fluorescent emissions from a microfluidic device. The method includes performing an auto-focus process associated with a first image of the microfluidic device and performing an auto-exposure process associated with the first image of the microfluidic device. The method also includes capturing a plurality of images of the microfluidic device. The plurality of images are associated with a plurality of thermal cycles. The method further includes performing image analysis of the plurality of captured images to determine a series of optical intensities and performing data analysis of the series of optical intensities to provide a series of change in threshold values.

A biological optical measuring instrument comprising a measuring probe (101) for collecting light from a plurality of portions of a subject (214) transmitted through the subject (214) by means of an optical fiber (108) by guiding light emitted from a light source (102) by an optical fiber (107), and irradiating the light to the subject (214) so as to create a living body transmitted light intensity image of the subject (214) from the transmitted and collected light. The measuring probe (101) further comprises optical fiber fixing members (201, 210, 211) for fixing the optical fibers (107, 108) at a predetermined interval and support members (202, 204, 205) for rockably supporting the optical fiber fixing members. Thus, it is possible to provide a technique of performing living body optical measurement while the living body lies in lateral decubitus.

A method of configuring one or more illumination states for illuminating at least two user interface devices of a mobile device, the method comprising assigning a first illumination state to first and second user interface devices, when intensity of ambient light is greater than a first threshold; assigning the first illumination state to the first interface device, and a second illumination state to the second interface device, when the intensity of the ambient light is between the first threshold and a second threshold; and assigning the second illumination state to the first and the second user interface devices, when the intensity of the ambient light is less than the second threshold.

Systems and methods are provided for detecting ambient light with reduced sensitivity to infrared sources. An electronic device may include an infrared sensor, an ambient light sensor, a decoder, and a processor. The infrared sensor may detect an intensity of infrared light. The ambient light sensor may be configured to detect incident light and to generate an electronic signal indicative of an intensity of visible light. The decoder may be configured to receive the intensity of infrared light and to generate an intensity of decoded infrared light. The processor, which may be coupled to the decoder and the ambient light sensor, may be configured to substitute an alternate electronic signal for the electronic signal if the intensity of infrared light exceeds a threshold amount.

An ablation catheter system configured with a compact force sensor at a distal end for detection of contact forces exerted on an end effector. The force sensor includes fiber optics operatively coupled with reflecting members on a structural member. In one embodiment, the optical fibers and reflecting members cooperate with the deformable structure to provide a variable gap interferometer for sensing deformation of the structural member due to contact force. In another embodiment, a change in the intensity of the reflected light is detected to measure the deformation. The measured deformations are then used to compute a contact force vector. In some embodiments, the force sensor is configured to passively compensate for temperature changes that otherwise lead to erroneous force indications. In other embodiments, the system actively compensates for errant force indications caused by temperature changes by measuring certain local temperatures of the structural member.

An optical waveguide grating coupler for coupling light between a planar waveguide and an optical element such as an optical fiber. The optical waveguide grating coupler includes a grating comprising a plurality of elongate scattering elements. The optical waveguide grating coupler is preferably flared, and in various embodiments has hyperbolically shaped sidewalls. The elongate scattering elements are preferably curved, and in some embodiments, the scattering elements have elliptically curved shapes. Preferably, the elongated scattering elements have grating widths selected to accommodate the desired optical intensity distribution.

An optical transmitter for an optical fiber transmission system is described. The optical transmitter includes an optical source that generates an optical signal having a wavelength at an output. An optical intensity modulator modulates the optical signal with an electrical modulation signal to generate a modulated optical signal at an output. At least one parameter of the optical intensity modulator is chosen to suppress at least one of phase and sideband information in the modulated optical signal. An optical fiber is coupled to the output of the optical intensity modulator. The suppression of the at least one of the phase and the sideband information in the modulated optical signal increases an effective modal bandwidth of the optical fiber.

The high precision vision detection system includes the digital staff guage system, the illuminating system with adaptive adjusting optical intensity, the auto focus system, the optical image system, the vision detection software, the foundation, the computer or microprocessor system. The digital staff guage system is used to provide the high precision length detection base in large scale; the illuminating system is used to adjust the optical intensity according to the different of the detection distance, detection angle and the surface reflectivity of detected workpiece to provide the uniform and stable illuminating intensity to pledge the image quality and the detection precision; the auto focus system is used to adjust the working distance of the detection system to pledge the image has the good quality and constant amplification ratio and pledge the repeatability and detection precision of the detection system; the optical image system is the main part of the detection system, which is used to transform the geometry outlook of detected workpiece to the computer or processor through the optical lens image, the vidicon photoelectricity switch and collecting control circuit; the vision detection software is used to process the image and get the detection result; the foundation is the supporting frame of vision detection system, which is used to fix, support and move every part of system; the computer or microprocessor system is the core part of the whole vision detection system, which is used to coordinate and control every system.

Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encoded in a M-ary PAM symbol sequence, where M>=2. The PAM symbol sequence is input to a finite-state machine, which yields an encoded sequence that changes sign between two symbol intervals when the encoded sequence takes on a nominally zero value during an odd number of intervening symbol intervals. The encoded sequence is lowpass filtered and modulated onto an optical electric field. The receiver processes a received optical electric field to obtain an electrical signal proportional to the received optical intensity, and performs M-ary symbol-by-symbol decisions to recover the transmitted information bits, without potential error propagation.

The invention discloses a method for measuring high reflectivity based on self-mixing effect of semiconductor laser which belongs to the technical field of measuring optical elements parameter. The present cavity ringdown technique for determining high reflectivity by measuring ringdown time, using the self-mixing effect of semiconductor laser, improves laser power to coupling efficiency of ringdown cavity by controlling back feedback optical intensity of continuous wave semiconductor laser, greatly improves the signal-noise ratio of cavity outputting signal, thereby improving measuring precision and measuring range of high reflectivity. The methods for controlling back feedback optical intensity which can make the cavity output signal reach the maximum include: inserting a linear polarizer, an attenuation plate, an optical isolator or a variable aperture between the semiconductor laser and the first cavity mirror, or adjusting the pitching of the first cavity mirror, or changing the distance of the laser and the first cavity mirror.

An active retina implant has a multiplicity of pixel elements that convert incident light into electric stimulation signals for cells of the retina with which stimulation electrodes are to make contact. Each pixel element is provided with at least one image cell that converts incident light into electric signals, there being provided at least one amplifier whose input is connected to the image cell and whose output is connected to at least one stimulation electrode to which it supplies a stimulation signal. Also provided is an energy supply which provides externally coupled external energy as supply voltage for the image cells and the amplifiers. The image cell has a logarithmic characteristic according to which incident light of specific intensity is converted into electric signals of specific amplitude. The stimulation signal is supplied in the form of analog voltage pulses of specific pulse length and pulse spacings, the pulse amplitude being a function of the intensity of the incident light.

An optical field receiver comprises an optical brancher that branches a received optical multilevel signal into first and second optical signals; an optical delayed detector that performs delayed detection on the first optical signal by a delayed detector with a delay time of T/2 (where T is equal to a symbol time) and a phase difference of 90 degrees; a balanced optical receiver that converts the optical signal outputted from the first delay detector to an electric signal; and an optical intensity receiver that converts the second optical signal to an electric signal; and an electric field calculating part that generates, from the output signals of the first and second optical receivers, first and second reproduced signals indicative of the phase angle and amplitude value of the received symbol represented by the complex signal in each symbol time T.

In a wavelength monitor that monitors a wavelength of laser light emitted from at least two semiconductor lasers formed in parallel on a semiconductor substrate, the wavelength monitor includes a collimating lens that collimates laser light from each of the semiconductor lasers, an etalon that is arranged so that laser light collimated by the collimating lens is capable of entering and has a periodicity, and a photodetector that receives laser light transmitted through the etalon and detects a light intensity, wherein a beam propagation angle in the etalon of laser light emitted from each of the semiconductor lasers becomes a predetermined angle obtained by formula 1.