49results about How to "Optical power stability" patented technology

The invention discloses a 10 Giga optical link terminal optical transmitter and receiver integrated module, which includes a module optical interface, a module electrical interface and a kilo mega transmitter and receiver integrated optical component, also includes a 10 Giga optical transmitter component, and a 10 Giga transmitter drive circuit for driving the component. The 10 Giga transmitter drive circuit is composed of a signal transformation circuit, a laser drive circuit and a matching circuit, wherein the signal transformation circuit input terminal is connected with the electrical signal to be transmitted, the signal after being transformed by the signal transformation circuit is inputted into the laser drive circuit, the modulated signal, which is outputted from the laser drive circuit and is modulated by the matching circuit, is inputted into the electroabsorption modulator input terminal of the 10 Giga optical transmitter component, for driving 10 Giga optical transmitter component transmitter emitted light signal. The optical receiver and transmitter integrated module has signals with 10Gbps and 1.25Gbps down transmission rate, and signals with 1.25Gbps upward transmission rate, thereby realizing asymmetric transmission of upward signal and down signal for meeting the need of high-speed bandwidth.

The invention provides an external sudden automatic optical-power control circuit comprising a sampling resistor, a sudden sampling retaining circuit, a buffer circuit, a sampling compensation circuit and a microcontroller, wherein the microcontroller is provided with an A / D conversion end and at least one D / A conversion end; a laser bias current control signal is output by one D / A conversion end; one end of the sampling resistor is earthed, and the other end is connected with the input end of the sampling retaining circuit and the anode of the backlight diode of the laser; the output end of the sudden sampling retaining circuit is connected with the input end of the buffer circuit; the output end of the buffer circuit is connected with the A / D conversion end of the microcontroller; the sampling compensation circuit is connected between the microcontroller and the sudden sampling retaining circuit; and a BEN synchronizing signal acts on the sudden sampling retaining circuit and the sampling compensation circuit. In the external sudden automatic optical-power control circuit, an ONU (optical network unit) module has better stability and circuit expansibility for optical power and extinction ratio under the sudden working condition.

The invention discloses a receiving end optical power control system used for fiber vibration sensing. A light emission port of a light source is connected with a light divider through a vibration sensing fiber. A second light division branch of the light divider is connected with an optical path of an optical detector. The optical detector converts light signal intensity into a light intensity simulation electric signal. An amplifier is used for amplifying the light intensity simulation electric signal. An analog-digital converter converts the amplified light intensity simulation electric signal into a digital signal used for representing light intensity. A threshold value judger is used for judging whether the digital signal used for representing light intensity is lower than a normal optical power threshold value, and if yes, an output number is amplified. An optical power adjuster is used for converting the adjusted number into a simulation signal. A driving circuit adjusts the driving current intensity of the light source according to the simulation signal so as to adjust the output optical power of the light source. According to the invention, the system is capable of acquiring relatively stable receiving optical power at the end of the optical detector in a low-cost resonant sensing system.

The invention provides a kind of laser inside carving device of transparent material. It includes laser instrument, ray-expanding mirror, the first shaking mirror, the second shaking mirror, F- Theta focusing mirror and computer. The laser instrument contains full-reflecting mirror, sound and light Q-adjusting device, semiconductor pump module, frequency doubler crystal and exporting mirror. The full-reflecting mirror is plated with fundamental frequency full-reflecting membrane layer or is plated with fundamental frequency and multiplier frequency doule full-reflecting membrane layer. The exporting mirror is plated with membrane layer whose throughing ratio to fundamental frequency light is 4%~10% and to multiplier frequency light is full. The laser instrument produces 1~10 kilohertz Q-adjusting multiplier frequency laser pulse output. The computer controls the first shaking mirror and the second shaking mirror to separately move swiftly in X, Y direction, thus makes the laser beam that has been through the ray-expanding mirror to move in scanning in XY direction, and controls one dimension electrical controlling displacement platform to realize the moving in Z direction of the focusing mirror and the transparent material. The advantage of the invention is that its laser outputing mode is good, light power is steady and efficient, the carving ratio is swift, and is suitable for the carving of transparent material with big breadth.

The invention discloses an improved on-line optical cable monitoring method. In an optical time domain reflectometer, a laser connected with a ring coupler is a DFB-LD laser with a refrigerator; the refrigerator and the DFB-LD laser are respectively connected with a refrigerator driving circuit and a laser driving circuit; the refrigerator driving circuit, the laser driving circuit and an A / D conversion circuit are connected with an FPGA control unit; and the FPGA control unit is connected with a network communication interface. During monitoring, the refrigeration current of the refrigerator is 500-900mA, pulse signals Pulse1 for starting the laser driving circuit and square signals Pulse2 for starting the refrigerator driving circuit, which are generated by the FPGA control unit, have the same period of 10-30s, and the duty ratio of the square signals Pulse2 is less than or equal to 50 percent. The method has the advantages of reducing light intensity noise, having small OTDR curve waves, little influencing optical signals in communication service, meeting the requirement of on-line optical cable monitoring, and improving the accuracy of analyzing and judging optical cable states and event points by on-line optical cable monitoring equipment.

The invention relates to a multipoint gas sensing system based on an optical fiber buffer, which comprises an address encoder, a double-wavelength light source, a multipoint optical fiber sensing network and a demodulator. The address encoder generates an address code and a read-write control signal of different monitoring points; each detecting unit of the multipoint optical fiber sensing network adopts a buffer structure introduced with a gas absorbing chamber in an optical fiber loop; a double-loop coupling all-optical buffer and a polarization type all-optical buffer can be adopted; under the control of a write signal, the optical signal of the address code is written into the optical fiber loop of the detecting unit and circularly absorbed by the gas many times; the absorbed optical signal is read out and sent to the demodulator for photoelectric conversion, comparison with the reference light, address decoding and data processing in order to gain the gas concentration in different points and realize the multipoint gas monitoring. The system gains the good effects through improving the structure of the absorbing chamber, adding an optical amplifier, a polarization control and a device with the wavelength of 1665nm, and is used in the monitoring of the gas which has the wavelength of 1665 nm and is near provided with an absorption peak.

The invention discloses an anti-radiation wide-spectrum optical-fiber light source based on photo-bleaching. The optical-fiber light source is a multi-pump double-pass backward structure and adopts an erbium-doped photo crystal optical fiber as a gain medium. A tail fiber of a 980nm laser is in fusion connection with one end of a first wavelength division multiplexer; a tail fiber of a 810nm laser is in fusion connection with one end of a third wavelength division multiplexer; a tail fiber of a 665nm laser is in fusion connection with the third wavelength division multiplexer; the other two ends of the first wavelength division multiplexer are in fusion connection with a second optical spectrum filter and an erbium-doped photo crystal optical fiber; one end of the second wavelength division multiplexer is in fusion connection with the erbium-doped photo crystal optical fiber, and the other two ends of the second wavelength division multiplexer are in fusion connection with the first optical spectrum filter and the third wavelength division multiplexer; and a fiber leading-out end of the second optical spectrum filter is in fusion connection with a fiber leading-in end of an optical fiber isolator, and a fiber leading-out end of the optical fiber isolator is used as a light output end. Multiple special wavelength lasers are used for simultaneously pump to realize the effective photo-bleaching, so that the stability of the average wavelength and the output power of the erbium-doped optical fiber light source can be guaranteed under the space radiation environment.

The invention provides a laser wire stripping device, comprising a rack, a working platform, a laser generation chamber, laser heads, a movement mechanism and a control mechanism; wherein, the laser generated by the laser generation chamber is transmitted to the laser heads by a reflection mirror group to realize laser light path transmission; the movement mechanism controls the laser heads to realize wire stripping; the laser heads are symmetrically arranged with one at an upper position and the other at a lower position by taking the working platform as a symmetrical surface; the movement mechanism comprises a Y axis movement part for realizing forward and back motion, an X axis for realizing side-to-side motion and an upper and lower laser switching mechanism for realizing up-and-down motion; the device of the invention has the advantages of high working efficiency and low equipment cost, in addition, the device can well strip coaxial cable metallic shield layers and aluminium foil shield layers, does not cause shield layer deformation, does not damage insulating layers and conductors, features high yield and the like.

The invention relates to a linear polarization laser power stabilization technique, in particular to a laser extra-cavity power stabilization device and a laser extra-cavity power stabilization method. The device and the method solve the technical problem that the current laser stabilization method cannot ensure frequency stabilization during power stabilization. The laser extra-cavity power stabilization device comprises a laser device system, wherein a first lambda / 2 wave plate and a polarization beam splitter are sequentially arranged on an emitted light path of the polarization beam splitter; a second lambda / 2 wave plate and an acoustic optical modulator are sequentially arranged on a transmitted light path of the polarization beam splitter; a photoelectric detector is arranged on a reflected light path of the polarization beam splitter; a signal output end of the photoelectric detector is connected with a computer control unit which is internally provided with a data processing and PID (Proportion Integration Differentiation) control program based on labview; and a signal output end of the computer control unit is connected with a driving modulation port of the acoustic optical modulator. The device and the method can achieve high-accuracy stabilization control of linear polarization laser; the light paths are simple; adjustment is easy; and real-time control and display of laser power are achieved.

An atmospheric cloud height, humidity profile, or temperature measuring method and arrangement are provided. In the method, pulsed laser signals (14) are transmitted through transmission optics (2, 3, 4, 5, 6) to the atmosphere and the signal (15) reflected or scattered back from there is detected. An interference filter (3) is used in the optics, in order to stabilize the transmitted optical power to the centre wavelength of the interference filter (3).

The invention discloses an LED pulse excitation light source system. The LED pulse excitation light source system comprises an upper computer, a control module, an LED driving module, a light source module and an optical power acquisition module, wherein the upper computer is used for setting an optical power value of an LED pulse excitation light source, the control module is used for mapping theoptical power value of the LED pulse excitation light source to obtain a reference voltage signal value, the LED driving module is used for driving the light source module to emit light and adjustinga current required by the light source module according to the reference voltage signal value, the light source module is used for emitting light and outputting the LED pulse excitation light sourceat a special wave band, the optical power acquisition module is used for acquiring a coupling optical power value of the LED pulse excitation light source in real time, the control module is used forperforming closed-loop feedback and correction on the reference voltage signal value according to the coupling optical power value of the LED pulse excitation light source. By outputting the LED pulseexcitation light source at the special wave band and performing closed-loop feedback and correction on the reference voltage signal value, the optical power stability of the LED pulse excitation light source is achieved, and the problems of optical power and peak wavelength drift of the LED pulse excitation light source caused by environmental factors such as time and temperature are prevented, and the sensitivity and the stability of an underwater fluorescent sensor are improved.

The invention discloses a triple play optical path structure in an EPON / OLT. The structure comprises four parts of a Triplexer, a transmitting unit, a receiving unit and a monitoring unit; the Triplexer comprises two lasers and a detector; the transmitting unit is composed of two lasers and is used for converting 1G and 10G electric signals into optical signals and keeping optical power stability in a closed loop state through a digital APC circuit; the receiving unit comprises a trans-impedance amplifier, an avalanche photodiode and limiting amplifiers; the monitoring unit is used for detecting the working state of the optical path structure in real time; the transmitted light and the received light are gathered in an optical device through a WDM, thus, single-optical fiber two-way transmission is realized; meanwhile, an MCU control module controls the size of a modulation current, and further the extinction ratio demanded by the system can be obtained. The structure is simple in structure and strong in robustness; in adoption of the structure, the optical power stability is kept; moreover, the extinction ratio demanded by the system can be obtained; and the structure has relatively strong engineering application value in the optical communication field.

The present invention provides an optical wavelength division multiplexing system, belonging to the field of the optical fiber communication. The system provided by the invention comprises an optical transmitter, an optical fiber, an optical relay, a receiver, a control terminal and a management terminal. The output end of the optical transmitter enters the optical relay through the optical fiber; the output end of the optical relay enters the receiver through the optical fiber; the control terminal is connected with the optical transmitter, the optical relay and the receiver; the control terminal is connected with the management terminal; the optical wavelength division multiplexing system is connected with the optical transmitter, the optical relay and a preamplifier, an optical monitoring transmitter 1, a relay amplifier, an optical monitoring transmitter 2, an optical monitoring receiver 2 and a post amplifier through the control terminal in the receiver, the loss in the process of optical fiber transmission is collected in real time, and the preamplifier, the relay amplifier and the post amplifier are controlled to allow the optical power of the output end of the optical relay to be more stable and allow the quality of optical waves to be higher. The problem of poor and unstable quality of optical waves in an optical wavelength division multiplexing system in the prior art is solved.

The invention discloses an energy supplying system of power line temperature measuring equipment. The energy supplying system comprises a laser emitting module, an optical fiber, a photoelectric conversion module and a power supply management module. The laser emitting module emits laser and transmits the laser to the photoelectric conversion module through the optical fiber. The photoelectric conversion module converts optical energy of the laser to electric energy and supplies the electric energy to a working circuit of the power line temperature measuring equipment after voltage boosting and stabilizing of the power supply management module. The working characteristic of the laser emitting module can ensure stable output optical power on the condition of a certain temperature, and therefore relatively stable of power supply output power after conversion by the photoelectric conversion module is realized. Furthermore complexity and cost of a power supply system are reduced, and reliability of the power supply system is improved. Furthermore the energy supplying system settles a problem of acquiring electric power from the high-voltage side of the DC power transmission line by the temperature measuring equipment.

An atmospheric cloud height, humidity profile, or temperature measuring method and arrangement are provided. In the method, pulsed laser signals (14) are transmitted through transmission optics (2, 3, 4, 5, 6) to the atmosphere and the signal (15) reflected or scattered back from there is detected. An interference filter (3) is used in the optics, in order to stabilize the transmitted optical power to the center wavelength of the interference filter (3).

Provided is an LED display screen. A first heat radiating device is arranged in a box body, modules are arranged in a matrix mode on the front end face of the box body, a rear cover is fixed on the rear end face of the box body, a connecting mode of the rear cover and the box body is a detachable connecting mode, heat radiating holes are formed in the rear cover, and the modules comprise face covers, LED lamp plates and module housings. The front sides of the LED lamp plates are LED welding faces, LED light-emitting tubes are welded on the LED welding faces, the back sides of the LED lamp plates are integrated circuit welding faces, and second heat radiating devices are added on the integrated circuit welding faces of the LED lamp plates and are thermo-magnetic heat radiators. The LED display screen has the advantages of being light in weight, low in cost, good in heat radiating effect, stable in light efficiency and power, energy-saving and environment-friendly. In addition, the lumens depreciation of the LED light-emitting tubes is very low, the service life of the LED display screen is prolonged, and fault occurrence probability is reduced.

To stabilize power to an optical multimode receiver a multimode variable optical attenuator is connected to the receiver with the attenuator's voltage being controlled using a feedback signal provided by an output detector, the signal being processed using a control algorithm based on proportional-integrate-differential theory.

The invention discloses an LED (light-emitting diode) illuminating device which comprises a front end body, a rear end body, an arm support body and an upper cover cap, wherein the front end body and the arm support body are connected with each other, the arm support body and the rear end body are connected with each other, and the upper cover cap is arranged at the upper end of the arm support body. The LED illuminating device is characterized in that an illuminating module is arranged in the arm support body and comprises a radiator, a bottom cover and a light source, the radiator is fixed in the arm support body, the bottom cover is arranged at the lower end of the radiator, and the light source is arranged on the bottom cover. The high-power LED illuminating device provided by the invention aims to solve the technical problems that the existing lamp with an LED light source is poor in heat dispersion, and the light source can not be freely allocated and flexibly installed and replaced, and has the advantages of being strong in heat dispersion, having a illuminating effect, and allowing light sources to be flexibly selected, installed, replaced and combined.

The invention discloses a circuit and a method for optical module current subsection compensation, and relates to the field of optical communication. The method includes the steps that a third resistor and a working power source are connected, positive bias is generated by the circuit, and a laser is conducted; bias current and modulated current of the laser are absorbed by a second transistor, and the laser is modulated through a damping resistor and a second capacitor; voltage difference of a first resistor is measured, and a bias current value of the laser is calculated; voltage pressure of a second resistor is measured, and a modulated current value of the laser is calculated; the third resistor and the working power source are disconnected, the laser is closed, and the bias current and the modulated current of the laser are measured at measurement temperatures; slope efficiency of the bias current and slope efficiency of the modulated current of the laser are measured within a measurement temperature range. According to the circuit and the method for optical module current subsection compensation, compensation stability and compensation accuracy on an optical module are high, stability and accuracy of the optical module are improved, stability of luminous power and extinction ratio of the optical module can be guaranteed in a full-temperature range, and error codes can not happen easily in the communication process.

The invention provides a micro-optical assembly of a 25G BiDi optical module for 5G forward transmission. The assembly is characterized in that the assembly comprises a bottom plate, a pentagonal-prism-shaped glass substrate is placed on the bottom plate. A Tx optical filter for allowing emitted light to enter is attached to the left side surface of the glass substrate. The right side face of theglass substrate is plated with an antireflection film used for allowing received light to enter and allowing emitted light to be emitted out, a reflecting mirror is attached to the lower right inclined face of the glass substrate, and an Rx optical filter used for allowing the received light entering the Tx optical filter from the antireflection film to be reflected to the reflecting mirror to bereflected again to be output to a receiving end is attached to the upper side face of the glass substrate. Compared with the prior art, according to the micro-optical assembly, an Rx optical filter and a Tx optical filter are arranged on a glass substrate. The incident angles of the Rx optical filter and the Tx optical filter are small, the allowable incident angle error is large, the overall structure is compact, the size is small, the effective clear aperture reaches 0.6 mm, the assembly difficulty is reduced, the assembly cost of a 25G BiDi optical module for 5G forward transmission is reduced, and the packaging requirement of an SFP28 optical module is easily met.

The present invention provides an adapter assembly enabling the optical power to be more stable and the optical module with the adapter assembly, the assembly error among the adapter shell, the optical fiber insertion core and the PIN needle is effectively reduced, the requirement for the machining precision of a shell structural part is reduced, the optical power of the optical module is more stable, and the adapter assembly comprises the adapter shell and the optical fiber insertion core; a slot matched with the optical fiber insertion core is formed in the adapter shell, a plurality of optical fiber insertion holes are formed in the optical fiber insertion core, the optical fiber insertion core comprises a slot part and a limiting part, the slot part can be inserted into the slot, and the limiting part can limit the installation of the optical fiber insertion core in the slot; and clamping hooks are arranged on the adapter shell and located on the two sides of the front portion of the inserting groove respectively, the clamping hooks can be matched with the limiting parts of the optical fiber inserting core to limit the optical fiber inserting core, the optical fiber inserting core is further provided with PIN needle positioning holes, and the PIN needles are installed in the PIN needle positioning holes.

The invention discloses a power self-optimization method of a solid-state laser, and relates to the technical field of solid-state lasers, the method uses a control system to adjust the output power of the solid-state laser to meet the expected power, if not, parameter combination is coarsely adjusted to enable the output power to meet the expected power, then the parameter combination is finely adjusted, and the output power of the solid-state laser is thus stabilized. By means of the control system, monitoring of parameters of all modules of the solid-state laser can be achieved, high-precision control and adjustment of parameters such as current, temperature and position can be achieved, it is guaranteed that all the modules work in the most effective state, automatic optimization and adjustment of laser power are achieved, and it is guaranteed that light emitting power is stable; furthermore, the control system can monitor the working state of the laser and automatically detect the performance of the laser.

The invention discloses a receiving end optical power control system used for fiber vibration sensing. A light emission port of a light source is connected with a light divider through a vibration sensing fiber. A second light division branch of the light divider is connected with an optical path of an optical detector. The optical detector converts light signal intensity into a light intensity simulation electric signal. An amplifier is used for amplifying the light intensity simulation electric signal. An analog-digital converter converts the amplified light intensity simulation electric signal into a digital signal used for representing light intensity. A threshold value judger is used for judging whether the digital signal used for representing light intensity is lower than a normal optical power threshold value, and if yes, an output number is amplified. An optical power adjuster is used for converting the adjusted number into a simulation signal. A driving circuit adjusts the driving current intensity of the light source according to the simulation signal so as to adjust the output optical power of the light source. According to the invention, the system is capable of acquiring relatively stable receiving optical power at the end of the optical detector in a low-cost resonant sensing system.