815 results about "Optical power meter" patented technology

A system for calibrating a plurality of optical modules includes a plurality of optical signal sources and optical signal degradation elements optically communicating with input switches. The input switches supply optical test signals to optical modules (units under test) plugged into a common shelf. Calibration switches including variable optical attenuators may be used to adjust the input signal levels and alternately supply adjusted signals to an optical power meter and the units under test. A controller is used to control the adjustment and thereby provide defined, measured signal levels to the units under test. By reading data from the units under test and using these defined signal levels, the optical modules may be calibrated or diagnosed. Output optical switches are used in a similar fashion to calibrate or diagnose the outputs of the units under test. In addition to input/output power calibration, the invention may also perform wavelength calibrations.

The invention provides an active optical module multi-channel automatic test system and a method. optimal signals emitted by a tested optical module are monitored, and indexes of the incident light power, emission current, bias current, temperature, voltage, extinction ratio, eye diagram allowance, crossing point, OMA (optical modulation amplitude) etc. are measured and calculated; if the above indexes are all in accordance with the standard, the sensitivity of the optical module is tested, the emission optical power of the tested module is enabled to reach the sensitivity of the test standard via the adjustment of an attenuator, and error code tests are conducted; and if there is no error code, indexes of alarm value and alarm recovery etc. of the optical module are tested. According to the test system, an error detector, an optical module test board, an optical power meter, and the attenuator employed by the test system are all multi-channel devices, an optical switch and an optical splitter are combined for time-sharing multiplexing of one oscilloscope, at least 8 modules can be simultaneously tested, the utilization rate of the oscilloscope and the test efficiency of the optical module are greatly optimized, the equipment cost and the manual cost are reduced, and automatic and batch production of the optical modules is realized.

An imaging system and method that captures compressive sensing (CS) measurements of a received light stream, and also obtains samples of background light level (BGLL). The BGLL samples may be used to compensate the CS measurements for variations in the BGLL. The system includes: a light modulator to spatially modulate the received light stream with spatial patterns, and a lens to concentrate the modulated light stream onto a light detector. The samples of BGLL may be obtained in various ways: (a) injecting calibration patterns among the spatial patterns; (b) measuring complementary light reflected by digital micromirrors onto a secondary output path; (c) separating and measuring a portion of light from the optical input path; (d) low-pass filtering the CS measurements; and (e) employing a light power meter with its own separate input path. Also, the CS measurements may be high-pass filtered to attenuate background light variation.

Apparatus and methods for verifying an acceptable splice termination include propagating light energy into the stub optical fiber of a fiber optic connector, detecting and collecting the amount of optical power emanating from the stub optical fiber at a termination area of the connector, converting the optical power to an electrical signal proportional to the amount of collected optical power, and displaying the electrical signal on a feedback monitor, such as an optical power meter, an LCD bar graph, or an LED. An initial (i.e., reference) value is obtained with the field optical fiber not in physical contact with the stub optical fiber. A final (i.e., terminated) value is obtained with the field optical fiber in physical contact with the stub optical fiber and terminated to the connector. The final value is compared to the initial value to determine whether the change (i.e., difference) is sufficient. Alternatively, the final value is compared to a predetermined limit or threshold.

A laser power meter incorporating an absorber disc with a peripheral thermopile ring, either continuous or segmented, and an additional temperature detection element in the central portion, that enables measurement of beam size. This detection element can be a thermopile element, generally a ring of smaller diameter than the peripheral thermopile used, and located closer to the center of the absorber disc. With this arrangement the beam size can be measured, in addition to measurements of the power and the position of the beam. Alternatively, this centralized detection element can be a single thermocouple junction located at the center of the disc, which acts as the hot junction of a thermocouple pair. The second or cold junction is effectively located on the disc close to the peripheral thermopile. Alternatively, two temperature measuring elements can be used, one at the disc center and one at the periphery.

The invention discloses a device and a method for measuring the chirp parameter frequency response characteristics of an electro-optic intensity modulator, and relates to the technical fields of electronics. The device comprises a tunable laser, a polarization controller, a modulator for electro-optic intensity to be measured, a microwave signal source, a first optical connector, a second optical connector, a single mold optical fiber, an optical power meter, a photoelectric detector, a microwave power meter, a data collecting card and a computer, wherein the tunable laser, the polarization controller, the modulator for electro-optic intensity to be measured, the first optical connector, a dispersion optical fiber group, the second optical connector and the photoelectric detector are sequentially connected through optical paths, and the photoelectric detector, the microwave power meter, the data collecting card, the computer and the microwave signal source are sequentially connected through circuits. The device and the method have the advantages that the measurement precision is high, and the operation is convenient. The device and the method have important application prospects in aspects of optical fiber communication systems, electro-optic intensity modulator analysis and optical signal processing.

The invention relates to a platform for testing performance of a camera based on an EMVA1288 standard. The method is used for testing the performance of the camera to be tested. The platform comprises an integrating sphere, a camera obscure, an optical power meter arranged in the camera obscure, a computer control system and a bracket, wherein a light inlet hole is formed in the camera obscure; the light inlet hole is matched with a light outlet hole of the integrating sphere; a double-dick filtering component and the camera to be tested are sequentially arranged in the camera obscure along an optical shaft direction of the light outlet hole of the integrating sphere; the double-dick filtering component comprises an optical filter and an attenuation sheet; the optical power meter is positioned between the double-dick filtering component and the camera to be tested and is far away from the optical shaft; the optical filter, the attenuation sheet, the optical power meter and the camera to be tested are arranged on the bracket and are connected with the computer control system; the computer control system calculates and processes attenuation values of light intensity and brightness, and the light power data monitored in real time so as to obtain the performance parameters of the camera to be tested specified in the EMVA1288 standard. The testing platform can test all the parameters specified in the EMVA1288 standard, and is simple in structure and low in cost.

A optical fiber microvibration sensor based on optical fiber raster, uses resonance of suspended Prague optical fiber raster and subject to be measured to magnify vibration amplitude of the object to be measured, and it can do wavelength type modulation or intensity type modulation measurement of light. Two contacts on one end of 2x2 coupler are separately linked to wide - band light source, spectrum analyzer or, and two contacts on another end to matching fluid and transmission optical fiber which crosses contacts to enter insulating cylinder and with one end charactered suspended Prague optical fiber raster in the wavelength type modulation its fixed in the center by union joint. In the structure of using spectrum analyzer for wavelength type modulation measurement, suspended Prague optical fiber raster for calibrating reflected light central wavelength of vibration equilibrium position is charactered on transmission optical fiber near inlet of the connector. The invention has solved the problem of optical fiber raster cross sensitivity, measuring microvibration of large instrument in circumstance of strong electromagnetic field and high voltage.

The invention discloses a device and a method for aligning a pinhole of a point-diffraction interferometer, belonging to the technical field of optical precise debugging, namely a device and a method for aligning the pinhole of the point-diffraction interferometer provided to realize real-time monitoring of precise aligning and aligning states of a focusing spot and a diffraction pinhole in the point-diffraction interferometer. The device comprises a laser device, a laser beam expander, a first dispersion prism, a half-wave plate, a second dispersion prism, a third dispersion prism, a quarter-wave plate, a focus lens, a pinhole plate, a three-dimensional scanning and micro-adjusting mechanism, a first laser power meter, a second laser powder meter, a third laser power meter, a position detector and a computer. According to the device and the method disclosed by the invention, the aligning speed is increased; the pinhole aligning state is quickly aligned again when being monitored; power change of the laser device is detected by a sole laser power meter in the invention and the aligning state is reflected by a ratio of the laser power instead of an absolute value so that error judgment on the aligning state of the pinhole caused by laser power change is overcome.

The invention provides an integrated test system for a fiber-optic network. The system comprises a light source generator used for being connected with a first end interface of a to-be-measured optical fiber and sending a test light source, wherein the wave length of the test light source is selectable; an optical power meter used for being connected with the second end interface of the to-be-measured optical fiber, receiving the test light source and conducting the test on the relative power/absolute power to obtain the test result on the optical power of the to-be-measured optical fiber, wherein the wave length of the test light source is 1310 nm or 1550 nm during the testing process of the optical power meter; a light loss computing device used for calculating the difference value of the optical power as the test result on the light loss of the to-be-measured optical fiber based on the test result of the optical power meter on the test light source; a test control device used for controlling the operation of the system and receiving all the above test results to form a test report; and a centralized control computer used for receiving the test report updated by the above test control device. Based on the above integrated test system and the above integrated test method, the integrated test can be realized. Meanwhile, the system and the method can be applied in different test scenarios to generate a unified rest report for remote transmission. In this way, the remote centralized monitoring is realized.

The invention discloses a loss analysis device of a passive device, comprising a multi-wavelength light source, an optical switch, a polarization controller (PC), a shunt, a return loss test module, an optical power meter module and a singlechip, wherein the multi-wavelength light source is used for providing multi-wavelength lasers with stable power; the optical switch is used for selecting one of the multi-wavelength lasers for output; the PC is used for changing the polarization state of the lasers; the shunt is provided with a first end, a second end and a third end; the return loss test module is used for testing optical power reflected by the input end of the passive device to be tested; the optical power meter module is used for testing the optical power of the output end of the passive device; and the singlechip is used for controlling the laser output of the multi-wavelength light source, the laser selection of the optical switch and the changes of the PC for the laser polarization state, receiving data tested by the return loss test module and the optical power meter module, and processing the data. The loss analysis device is a multifunctional device which integrates the functions of a stable distributed feedback (DFB) light source, the optical power meter module, a plugging-return loss test set, and a polarization dependent loss (DPL) tester into a whole.

An imaging system and method that captures compressive sensing (CS) measurements of a received light stream, and also obtains samples of background light level (BGLL). The BGLL samples may be used to compensate the CS measurements for variations in the BGLL. The system includes: a light modulator to spatially modulate the received light stream with spatial patterns, and a lens to concentrate the modulated light stream onto a light detector. The samples of BGLL may be obtained in various ways: (a) injecting calibration patterns among the spatial patterns; (b) measuring complementary light reflected by digital micromirrors onto a secondary output path; (c) separating and measuring a portion of light from the optical input path; (d) low-pass filtering the CS measurements; and (e) employing a light power meter with its own separate input path. Also, the CS measurements may be high-pass filtered to attenuate background light variation.

The invention relates to a multifunctional optical signal processing system. In the system, continuous detection light and signal light are combined through a first coupler and injected into a high nonlinear optical fiber; idle light generated in the high nonlinear optical fiber due to a fourwave mixing effect is divided into two paths through an optical filter and an optical coupler and are output, wherein one output path is connected to an optical power meter, the optical power output performs feedback control on a tunable dispersion compensator so as to realize dynamic dispersion compensation, while the other output path is used as a system output signal to generate an optical signal with high extinction ratio and no dispersion; and the wavelength of the output optical signal is changed by regulating the wavelength of the detection light, so that tunable wavelength conversion is realized. The multifunctional optical signal processing system can realize HNLF (High Nonlinear Fiber), dispersion detection, extinction ratio enhancement and wavelength conversion, has the advantages of multifunction integration, high response speed, high sensitivity of dispersion detection, wide working wave band and transparency to signal speed and modulation format and can be applied to an optical transmission system with channel rate of over 40Gb/s.

The invention discloses a wide spectrum optical fiber source which has stable optical power and average wavelength. The optical fiber source comprises a microprocessor (1), a light signal acquisition circuit (2), a monitoring detector (3), a magneto-optical attenuator (4), a pump laser drive circuit (5), a temperature sensor (6), an attenuator drive circuit (7), a pump laser (11), a wavelength division multiplexer (12), an optical fiber ring (13), a gain flattening filter (14) and a fiber optic isolater (15); wherein, the pump laser (11), the wavelength division multiplexer (12), the optical fiber ring (13), the gain flattening filter (14) and the fiber optic isolater (15) form into the light path part of the wide spectrum optical fiber source; and the magneto-optical attenuator (4), the monitoring detector (3), the microprocessor (1), the pump laser drive circuit (5), the attenuator drive circuit (7), the light signal acquisition circuit (2) and the temperature sensor (6) form into the signal acquisition and processing part of the wide spectrum optical fiber source. The control device of the invention realizes the independence and simultaneous control of the two parameters of the average wavelength and the optical power through introducing the magneto-optical attenuator. The whole control system adopts whole digit mode and improves the stability of the average wavelength and the optical power of the wide spectrum optical fiber source.

The invention discloses a device for testing the performance of an optical module and aims at providing a convenient and quick test environment. The invention is realized by the following technical scheme: a PC is connected to a server through an RJ45 network cable, is connected to an optical module performance test board through a USB data line, and is connected to an optical power meter throughan RS232 serial line, the optical power meter is connected to an ROSA optical device through an optical fiber splitter, a tested optical module is connected to the test board through a gold finger slot, the average optical power of the TX end of the tested optical module is divided into two by the optical fiber splitter, one path is sent to the ROSA optical device, and the other path is sent to the optical power meter, the PC obtains the average optical power value of the optical module measured by the optical power meter, and then compares the average optical power value with an optical powerthreshold that have been configured by the server, and determines whether the average optical power value of the tested optical module is within a normal range by using the comparison result. An alarm light visually displays various performance test results of the tested optical module.

The invention discloses an optical power self-correction method for a fiber-optic gyroscope and a high-precision fiber-optic gyroscope using the method. The method comprises the following steps: extracting optical interference signals, collecting comb-type peak values Di when a bias phase position in the optical interference signals is close to 0, integrating the collected N comb-type peak values Di to obtain Dint, comparing Dint with the optical power value of a fiber-optic gyroscope working stably, and controlling power source driving current according to the comparison value so as to further adjust the output optical power of a light source. By the method, on the conditions that no extra device is use and reciprocity of light paths is not changed, the optical power of the light source is detected in an end-to-end manner, closed-loop control is implemented so as to realize the high-precision control on a low-cost SLD (super luminescent diode) light source, and the stability of output wavelength is improved. The high-precision fiber-optic gyroscope using the method does not need an expensive ASE (amplified spontaneous emission) light source, thereby greatly reducing the production cost.

The invention relates to a fibre core loss measuring method and system of a heterogeneous optical fusion welding point. The loss measuring system mainly consists of two light sources and two optical power meters. The fibre core loss measuring method comprises the following steps of: respectively connecting the light source to one end of each of different types of optical fibres, respectively connecting the optical power meter to the other end of each of the different types of the optical fibres, and obtaining optical power values Ra and Rb when the two optical fibers are directly connected; keeping the connection between the optical fibre tips and the optical power meters unchanged and the output power of the light sources unchanged, respectively cutting off the two optical fibers from the middle parts and carrying out fusion welding in a crossed way, and reading numerical reading of the optical power meters again to obtain optical power values Ras and Rbs after crossed fusion welding; and obtaining the average loss: [(Ra+Rb)-(Ras+Rbs)]/2 at the heterogeneous optical fiber fusion welding point through calculating according to the measured data. The fibre core loss measuring method is simple and effective, and has high precision and active roles and can be used for effectively measuring and estimating the fusion welding loss of different types of optical fibres.

The present invention discloses a method for measuring the gain and noise coefficients of the erbium-doped optical amplifier; the measurement comprises the following steps that a DFB light source can be input into a filter through a variable optical attenuator; the output end of the filter is connected with an optical power meter to obtain the input power Pin of EDFA; the input end of the EDFA is suspended and the flat region of the ASE spectrum in the EDFA is utilized for obtaining the ASE power PASE which is in the filter band width from the optical power meter; the DFB light resource signal can be emitted into the EDFA through the variable optical attenuator and the signal amplified by the EDFA and the ASE mixing power Pout are obtained from the optical power meter through the filter; by alternating the variable optical attenuator value, the EDFA gain and noise coefficient curves can be calculated and described. The beneficial effect is that the present invention utilizes the flat region of the ASE spectrum in the EDFA to match with a band-pass filter which can fast and accurately calculate EDFA gain and noise coefficients. The test method of the present invention is simple which greatly reduces measurement cost.

The invention relates to an all-optical dispersion monitor based on an optical parameter amplifier. The all-optical dispersion monitor comprises a semiconductor laser, a coupler, the optical parameter amplifier, an output optical filter and an optical power meter. The semiconductor laser emits low-power continuous detection light. The continuous detection light and signal light are combined through the coupler and are filled into the optical parameter amplifier. The optical parameter amplifier is based on first-order four-wave mixing effect which causes energy to be transferred to detection waves and idle waves from the signal light. The detection waves and the idle waves with exponential gains are output, pass through the output optical filter and are measured by the optical power meter. The invention has the advantages that the response speed is fast, the sensitivity is high, the working waveband is wide, the signal rate and the modulation format are transparent, the monitor can be used for the dispersion monitoring of a WDM system with single channel rate above 100Gb/s, the high-speed photoelectric device and the signal processing circuit are not required during measurement, and the cost of devices is reduced.