16 results about "Signal light" patented technology

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.

The invention relates to a gain control method of a distributed Raman fiber amplifier, which comprises the following steps of: firstly, acquiring the output power of a current pump and a signal light input power spectrum; then obtaining a gain error by the input power and a preset target gain, judging whether the gain error is larger than a preset threshold value or not, if so, executing the feedforward regulation on pump gain transient pre-control, or else, executing the feedback regulation on pump gain feedback control; when stepping into the feedforward regulation process, regulating the current pump and returning to the first step; and when stepping into the feedback regulation process, adjusting the current pump and returning to the first step. The invention also relates to a gain control device of the distributed Raman fiber amplifier. The gain control method and device of the distributed Raman fiber amplifier have the advantages of fast regulation speed, difficult divergence in the process, convergence time reduction and system performance improvement.

The invention relates to a traffic signal lamp information fusion decision-making method for an intelligent network connection vehicle. According to the method, the intersection traffic signal lamp state information is periodically broadcasted to the outside through a network, the intelligent network connection vehicle in the network communication range receives the information, and meanwhile, credibility feedback of other intelligent network connection vehicles to the information is received, and finally fusion decision making is performed on the traffic signal lamp information sensed by theintelligent network connection vehicles, the traffic signal lamp information sent by the network and the feedback information of the other intelligent network connection vehicles so that the traffic signal lamp information with higher reliability and accuracy can be obtained. According to the method, multiple verification is carried out on traffic signal lamp information on a bicycle, feedback verification of surrounding intelligent network connection vehicles is introduced, the risk that information is tampered in network transmission is reduced, reliability of network transmission of trafficsignal lamp information is improved, the intelligent network connection vehicles can obtain more reliable and accurate traffic signal lamp information, and the safe traffic capacity of the intelligent network connection vehicles at intersections is greatly improved.

The invention relates to an adjusting method of a resonant cavity. The method comprises the steps that a signal light output mirror and a signal light gain medium are additionally arranged at one end of the resonant cavity, so that the signal light output mirror, the signal light gain medium and an end resonant cavity mirror of the resonant cavity form a reference light resonant cavity, the reference light resonant cavity outputs a reference light under the irradiation of a pump light, and the reference light can be used for quickly and accurately adjusting the positions of other reflection cavity mirrors in the resonant cavity. Compared with the cavity mirror adjusting method employing He-Ne light in the prior art, the adjusting method is simpler and more accurate, avoids the limits on use occasions and is particularly applicable to field equipment debugging and maintenance and the like under insufficient conditions. Besides, an adjusting device only comprises the signal light output mirror, so that the structure is simple, the implementation is easy and the cost is low.

The invention discloses a system and a method for monitoring the optical fiber fuse effect. The system comprises a laser module, a linear swept source module, a light power injecting module, a Mach Zehnder interferometer module, a photoelectric detecting and data acquiring module and a swept source feedback controlling module, wherein swept light generated by the linear swept source module enters the Mach Zehnder interferometer module and is divided into probe light and reference light; a light signal generated by the laser module and the probe light are coupled in the light power injecting module and then enters a to be monitored optical fiber link, and signal light returned to the light power injecting module from the optical fiber link enters the Mach Zehnder interferometer module for interference beating with the adjusted reference light, and is input into the photoelectric detecting and data acquiring module; the feedback controlling module is used for controlling the laser module; the data acquiring module is used for performing later data processing, judging the occurrence of the optical fiber fuse effect and obtaining the position of a fault point through calculation. By means of the system and the method, monitoring is rapid and accurate, and the length and the position of a damaged optical fiber can be accurately determined.

The invention relates to a photoelectric liquid level sensor, which comprises a shell, a photoelectric receiver, a control circuit and at least one group of light guide components, and is characterized in that each light guide component comprises a photoelectric emitter, a first light guide column, a second light guide column and a first reflecting surface; the control circuit is used for controlling the photoelectric emitter to emit signal light and detecting whether the photoelectric receiver receives the signal light or not; the first light guide column guides the signal emitted by the photoelectric emitter to the first reflecting surface; and the first reflecting surface reflects the light guided out by the first light guide column to the second light guide column. And the second lightguide column is made of a transparent light guide material and guides the signal reflected by the first reflecting surface to the position of the photoelectric receiver. According to the invention, as the signal light is transmitted in the light guide column, the loss of the signal light in long-distance transmission can be greatly reduced, the testing distance is greatly increased, and the sensor can be mounted at the top of the liquid container. In addition, stray light interference received by the photoelectric receiver is little, and the detection result is accurate and stable.

The invention provides a method for improving a specific value of signal power and noise power in an amplifier, comprising: a signal power light and an ASE noise power light switching an input light channel to a bandpass filter in which the signal wavelength is located by an input light channel switching device; the bandpass filter filtering noise power beyond a band-pass range; and switching residual signal light into a main light path by an input light channel switching device. The method leads a narrow-band or single-channel signal to be capable of being switched to the corresponding bandpass filter when the signal wavelength is changed, thereby filtering the light accumulation of the noise power beyond a wave band and improving the specific value of the signal power light and the noise power light. The method can effectively improve the specific value of the signal power light and the noise power light, and has low cost, less occupation space and flexible design.

The invention discloses an all-optical sampler, comprising a continuous laser which is used for generating continuous signal light; an optical modulator which is driven by a radio frequency signal and is used for modulating an analog radio frequency signal through combination with the signal light, thereby generating continuous analog signal light; a polarization controller which is used for controlling a polarization state of the analog signal light; a first coupler which is used for allocating the low-power analog signal light into two ways of light according to a proportion; a Mach-Zehnder interferometer, wherein a first interference arm and a second interference arm of the Mach-Zehnder interferometer are used for receiving the two ways of analog signal light allocated by the first coupler; and a second coupler which is used for receiving the analog signal light output by the Mach-Zehnder inter-ferometer, coupling the analog signal light and then outputting sample signal light. According to the all-optical sampler, through utilization of cross-phase modulation effect of pump light for the analog signal light, the phase difference of the signals on the two interference arms is changed, so transmittance of the signals is changed; when the pump light exists, the signals are transmitted; and when the pump light does not exist, the signal transmittance is 0, thereby sampling the signals.

The invention relates to an optical fiber amplifier; especially to an S wave range detached Raman optical fiber amplifier, which is formed by a pump module and a yield module in the field of optical fiber communication. The S wave range detached Raman optical fiber amplifier comprises: an optical isolator, a wavelength-division multiplex device, and a semi-conductor laser. It is characterized in that the signal light in turn through the S wave range optical isolator 1, the wavelength-division multiplex device WDM, the color bias compensation optical fiber module DCF and the wavelength-division multiplex device WDM4; the laser of the pump wave-combining device 6 through the S wave range optical isolator 5 and enters into the wavelength-division multiplex device WDM4 which outputs the signal light.

The invention discloses a vehicle control method and device and an automatic driving vehicle. The method comprises the steps: in the process that a current vehicle runs according to an automatic driving mode, collecting an image in front of the current vehicle in real time; identifying whether traffic lights and parking lines exist in the image; under the condition that the traffic signal lamp and the parking line exist in the image, determining the indication state of the traffic signal lamp and the distance between the current vehicle and the parking line, wherein the parking line and the current vehicle are located on the same side of the traffic signal lamp; and controlling the current running speed of the vehicle according to the indication state of the traffic signal lamp and the distance. The technical problems that when an automatic driving vehicle passes through an intersection provided with a traffic signal lamp, the driving state of the vehicle cannot be controlled according to the indication state of the traffic signal lamp, the risk of traffic accidents may be increased, and the driving safety is poor are solved.

The invention discloses a cross-correlation detection system based on up-conversion and fluorescence resonance energy transfer nanoparticles. The system comprises a fluorescence cross-correlation spectroscopy detection module, an aptamer, up-conversion particles and fluorescence resonance energy transfer nanoparticles. The two ends of the aptamer are modified with the up-conversion particles and fluorescence resonance energy transfer nanoparticles. The fluorescence cross-correlation spectroscopy detection module excites the up-conversion particles and fluorescence resonance energy transfer nanoparticles to emit radiation spectrum separation light and detects fluorescence signals of the two kinds of light respectively. A computer carries out processing to obtain autocorrelation and cross-correlation spectra of the two kinds of light; and the autocorrelation and cross-correlation spectra are analyzed precisely to obtain parameters like the aptamer concentration. According to the invention, the selected up-conversion particles and fluorescence resonance energy transfer nanoparticles have the large anti-Stokes shift, so that the signal light, excited light, and environment noises are separated conveniently and the interference of background noises is reduced. Meanwhile, because of the up-conversion particles and fluorescence resonance energy transfer nanoparticles with large spectrum intervals, the interference between channels is reduced and the detection accuracy and result accuracy are improved.

The invention relates to the technical field of glass reflectance rate detection equipment, in particular to equipment for detecting whether glass reflectance exceeds standard or not for a glass curtain wall. The equipment comprises an equipment main body, a fixing frame is fixedly connected to the inner bottom surface of the equipment main body, a positioning frame is fixedly connected to the upper surface of the equipment main body, a fixed sliding rail is fixedly connected to the interior of the fixed frame, an extrusion plate is inserted into the fixed sliding rail, a limiting spring is connected to the portion, located in the fixed sliding rail, of the exterior of the extrusion plate in a sleeving mode, and a signal lamp outside the equipment is powered on, so that the signal lamp flickers, workers are reminded that the glass reflectance is high, the detection result is not qualified, so that the detection result is more intuitively shown, the detection efficiency of the equipmentcan be well improved, particulate matters on the surface of the glass move along with the flowing direction of the air flow, the particulate matters are prevented from influencing the reflection of light, and the accuracy of data obtained by the equipment in the detection process is ensured.

The invention relates to the field of optical detection equipment, in particular to multiband beacon optical detection equipment. The detection equipment comprises a signal light channel, a fine aiming mirror arranged in the signal light channel, a first beam splitter, a second beam splitter, a first detection device, a second detection device and a communication assembly, capturing and tracking of wide-beam signal light are achieved through a first detection device, and after being reflected by a fine aiming mirror, a first light splitting piece and a first light filter, an externally-transmitted beacon light beam is focused to a first detector through a first lens set to be imaged; narrow-beam signal light is captured and tracked through a second detection device, and an external signal light beam is reflected by a fine aiming mirror, transmitted by a first light splitting piece and transmitted by a second light splitting piece and then is focused to a second detector through a third lens group to be imaged. And capturing and tracking of multi-band signal light are realized. When the narrow-beam signal light is captured and tracked, a wide-beam signal light path of a transmitting end and a detection receiving end path are closed, so that the power consumption is effectively reduced.