65 results about "Optical wavelength" patented technology

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

A temperature strain separable dynamic and static combined measurement distributed optical fiber sensing system, comprising: laser, optical modulator, radio frequency signal generator, optical filter, DFB laser, polarization controller, first acoustooptic modulator, depolarizer, erbium-doped fiber amplifier, two optical circulators, optical wavelength division multiplexer, receiving module, signal acquisition and processing module are arranged in sequence, the application carries out temperature sensing to the back Raman scattering light of the pulse while receiving the Rayleigh scattering light of the detection pulse, and controls the time interval of adjacent pump pulse and detection pulse to carry out three-bit pulse coding and decoding, so that the back Raman scattering signals of individual pulse in pulse pair are separated in time, and finally the simultaneous measurement of dynamic variable (vibration) and static variable (temperature, static strain) is realized and the spatial resolution of measurement is ensured not to be lost.

The utility model relates to the technical field of fiber bragg grating demodulation, in particular to a multichannel high-speed fiber bragg grating demodulation device, which comprises an optical path module and an electric signal module, the optical path module comprises a tunable laser unit, a PLC (programmable logic controller) unit and a plurality of FBG (fiber bragg grating) sensors, the PLC unit comprises an optical splitter and a plurality of couplers, the electric signal module comprises a main control unit, a photoelectric conversion unit, a DC / DC unit, a 485 communication unit and an Ethernet communication unit, optical signals emitted by the tunable laser unit pass through an optical splitter and a multi-path coupler and then enter an FBG sensor, light is reflected by a grating and then is connected to a photodiode through the coupler, and the photoelectric conversion unit is connected to the Ethernet communication unit. And after photoelectric conversion, AD conversion and peak searching algorithm processing, the optical wavelength is demodulated. According to the utility model, a chip-level data acquisition design is adopted, the scanning speed of the demodulator is improved, fusion with a field system is facilitated through the 485 communication unit, and a heterogeneous system of the master control unit and the FPGA unit is adopted, so that the edge computing capability is enhanced.

The application discloses a frequency synchronization method of coherent clock system in high-speed data transmission, and a frequency synchronization method and equipment structure for providing high-precision time-frequency reference transmission and 10Gbps data stream transmission. A high-speed modulator is used to generate a radio frequency signal at a local end and a remote end, and the radio frequency signal is received from the opposite end. A carrier tracking technology is used to recover the radio frequency carrier, and a frequency discrimination and phase discrimination value is obtained through a signal processing algorithm in a digital domain. The local frequency discrimination and phase discrimination value is sent to the remote end, the remote end uses the local value and the opposite value to realize joint phase discrimination, and then the joint phase discrimination is sent to a loop filter. The loop filter outputs a voltage control signal, and the remote end uses the voltage control signal to control a voltage-controlled crystal oscillator, so that the frequency synchronization between the remote end and the local end is realized. The method can realize single-fiber single-wavelength bidirectional time-frequency synchronization and high-speed data transmission, can fully utilize the optical wavelength resources of the optical fiber transmission system, and can save the optical wavelength resources compared with the traditional method, and has higher frequency synchronization precision.

Optical transceiver architecture utilizing micro-ring modulators and micro-ring resonators configured to route resonant wavelengths of light injected into each micro-ring resonator's input port and through port to that micro-ring resonator's drop port and add port, respectively. The micro-ring resonators drop two distinct streams of data modulated onto the same optical wavelength, or two wavelengths separated by an integer number of free spectral ranges coupled into the micro-ring resonators in two different directions.

The invention provides a multi-band optical transmission system channel waveform modeling method and system based on attention gating LSTM. The method comprises the following steps: constructing a multi-band coherent optical wavelength division multiplexing transmission simulation system; generating an input / output signal pair based on a simulation system to construct an original data set; performing signal channel decoupling and preprocessing to obtain a single-channel data set; constructing a time sequence sample by using a sliding window; constructing an attention gating LSTM model and training the attention gating LSTM model; and calling the trained model to perform channel modeling reasoning. According to the invention, the problems of complex channel coupling in multiband optical transmission and low modeling efficiency of a traditional model are solved.

It is an object of the present disclosure to appropriately perform quantum key distribution through an optical wavelength division multiplexing link. There is provided a communication apparatus that communicates an optical signal based on an electrical signal obtained by multiplexing a first control signal addressed to a second optical communication apparatus from a first optical communication apparatus and a control signal for reception signal processing from a first quantum key distribution apparatus to a second quantum key distribution apparatus.

The invention discloses single-fiber wavelength division optical transmission equipment and a system thereof. The equipment comprises a case, a service processing module, a wave combining and dividing module, a network management module, a power supply module and a heat dissipation module, the service processing module comprises at least one optical wavelength conversion unit, and the optical wavelength conversion unit is used for converting an accessed non-standard wavelength signal into a plurality of paths of standard wavelength signals; the wave combining and separating module comprises a wave combining unit and a wave separating unit, the wave combining unit is used for combining multiple paths of standard wavelength signals into one path of composite optical signal, and the wave separating unit is used for separating the composite optical signal into multiple paths of single wavelength signals; the network management module is used for monitoring the working state of each module in real time; the power supply module supports alternating current or direct current input and outputs stable voltage; the heat dissipation module is provided with a speed-adjustable heat dissipation fan. According to the scheme, optical fiber resources can be efficiently integrated, multiple services can be flexibly adapted, and the deployment and upgrading cost is low.

This invention discloses a steady-state tunable dual-wavelength generation method based on laser phase-locked loop (PLL), belonging to the field of microwave photonics technology. It includes carrier-suppressed optical double-sideband modulation, a laser PLL, and optical wavelength control. Carrier-suppressed optical double-sideband modulation: the reference signal generated by the reference laser directly drives the modulator, which operates at the carrier suppression point, modulating the RF source onto the two sidebands of the reference signal, providing two reference wavelengths for dual-wavelength generation. Costa laser PLL: based on Costa PLL technology, frequency capture and phase locking of the signal light to the reference light are achieved. Optical wavelength control: digital frequency discrimination is used to track the frequency and phase difference between the signal light and the reference light, controlling the signal light wavelength to remain consistent with the reference light wavelength. This invention solves the frequency drift problem caused by using two independent light sources, and by combining optical frequency doubling, achieves steady-state tunable dual-wavelength generation, thereby supporting the generation of high-quality millimeter-wave signals.

The invention belongs to the technical field of tunable lasers, and particularly relates to a rotating shaft abnormity test system and method based on a tunable laser, and the system comprises a spectrum analyzer, an optical switch, an optical wavelength meter, and a calculation module. The mode-hopping-free tunable laser serves as a testing device, whether the rotating shaft for the tunable laser is abnormal or not is tested, an obtained resonance output wavelength testing result is automatically analyzed, and therefore the optimal tunable output interval which can be achieved by the rotating shaft to be tested is obtained. And on the basis, accurate screening of non-abnormal rotating shafts suitable for tunable laser assembly is realized.

Aspects of the subject disclosure may include, for example, associating a first optical signature including a first distinct wavelength profile of a group of wavelength profiles, with a first optical signature responder deployed at a first location, wherein the first optical signature responder is coupled to a distal end of an optical fiber and wherein the first optical signature responder is configured to selectively reflect only the first distinct optical wavelength profile. A test signal is injected into a proximal end of the fiber and an optical spectrum including the group of wavelength profiles is monitored at the proximal end to obtain a response signal. An absence of the first distinct wavelength profile within the response signal indicates fault condition associated with the first optical signature responder. Other embodiments are disclosed.

The present disclosure relates to coupling devices and methods, wavelength locking systems and methods, and phase-unwinding systems and methods. A configuration of an optical device for splitting and wavelength locking is disclosed. The optical device can be a 2x3 coupler in which a first waveguide is coupled to a second waveguide, and a third waveguide is coupled to the second waveguide. The first waveguide and the third waveguide can receive input light and optically couple light to the second waveguide. Output signals of the first waveguide, the second waveguide, and the third waveguide can have constant phase difference values from each other over a wideband wavelength range, which can allow for phase unwinding. By phase unwinding the output signals over an FSR and performing further phase unwinding over the wideband wavelength range, a continuous signal can be produced and used to sequentially lock each optical wavelength emitted by an optical source over the wideband wavelength range.

The invention discloses a capacity expansion system applied to a virtual cascade optical transport network private line. According to the system, an intelligent optical transmission platform device is provided with a local side self-adaptive wavelength optical module which is adaptive to a preset number of optical wavelengths; the intelligent optical transmission platform equipment is connected with an input interface of the local side multiplexer / demultiplexer, and an output interface of the local side multiplexer / demultiplexer is connected with the main optical cable cross connecting box through a single-core optical fiber; the main optical cable cross-connecting cabinet and the building optical cable cross-connecting cabinet are connected through a single-core optical fiber. The building optical cable cross-connecting box is connected with an input interface of a far-end wave combiner / splitter configured by a service general point through a single-core optical fiber, an output interface of the far-end wave combiner / splitter configured by the service general point is connected with a far-end self-adaptive wavelength optical module, and the far-end self-adaptive wavelength optical module is configured on client side equipment. According to the method, the problems that the special line capacity expansion construction period is long, the emergency demand of an enterprise for the special line bandwidth cannot be quickly responded, and network fluctuation and even service interruption are easily caused in the capacity expansion operation process are solved.

The utility model belongs to the technical field of insulating layers, and particularly relates to a composite precise insulating layer structure, which adopts an atomic deposition system, a first layer adopts a precursor source and a metal source to form a high refractive index layer; the second layer adopts a precursor source and a metal source to form a low-refractive-index layer; the third layer to the N layer adopt precursor sources to alternately form a periodic refractive index gradient structure, the total layer number N is larger than or equal to 3, the single-layer thickness is lambda / (4n), lambda is the target regulation and control optical wavelength, and n is the film layer refractive index. According to the utility model, more than three layers are alternately stacked, so that films with high and low refractive indexes can be obtained through insulating layers formed by different precursor sources, and as a Bragg structure, the reflectivity is improved; in addition, the third layer starts to form a gradient structure with a periodic refractive index, and the regulation and control requirements of the light-emitting device on light overflow and light reflection are facilitated.

The utility model relates to an insulator discharge acquisition mechanism and an insulator discharge monitoring device. The insulator discharge collecting mechanism comprises a shell, a monitoring assembly, a rotating wheel assembly and a light-transmitting part. The monitoring assembly comprises an ultraviolet lens installed in the shell. The rotating wheel assembly comprises a rotating wheel filter disc and a rotating wheel driving part, the rotating wheel filter disc is rotationally connected to the shell, and a plurality of optical filters with different optical wavelength transmission ranges are arranged on the rotating wheel filter disc. The rotating wheel driving part is installed on the shell and is in driving connection with the rotating wheel assembly, and the rotating wheel driving part drives the rotating wheel filter disc to rotate so as to switch different optical filters to be aligned with the ultraviolet lens. The light-transmitting piece is arranged on the shell and covers the light path inlet of the light filter. According to the insulator discharge acquisition mechanism in the embodiment of the invention, the discharge information of a plurality of different ultraviolet bands can be acquired, so that the acquired data is more comprehensive, and the acquisition efficiency is improved.

A photoelectric conversion element includes a first electrode, a first interfacial layer, a photoelectric conversion layer, and a second electrode in this order, wherein the photoelectric conversion layer includes quantum dots and a first organic compound, the first organic compound satisfies Formula (1), an electron affinity of a material used for the first interfacial layer, an electron affinity of the quantum dots, and an electron affinity of the first organic compound satisfy Formulas (2) and (3):E2>E1  (1)E1 [eV]: energy at short-wavelength end of optical wavelength region detected by the photoelectric conversion elementE2 [eV]: band gap of the first organic compoundE3<E4−0.2  (2)E4−0.4<E5<E4  (3)E3 [eV]: electron affinity of material used for the first interfacial layerE4 [eV]: electron affinity of the quantum dotsE5 [eV]: electron affinity of the first organic compound.

There is provided a transceiver-switch device (16, 20, 40), for communicating data in 5 an optical network (19, 95), the network (19) comprising a plurality of nodes (90, 92, 94) connected by optical signal paths, the device (16, 20, 40), provided at one node of said plurality of nodes (90, 92, 94), being configured to execute selection of optical wavelength, time of communication, and optical signal path, for communication of data in the optical network (19, 95) to and from said node, and wherein said device (16, 20, 10 40) is provided in a single physical module.

To provide a light wavelength conversion medium excellent in emission intensity and durability, and also a light wavelength conversion medium-forming composition used for forming that medium.SOLUTION: A conversion medium according to an embodiment comprises a rare earth phosphor comprising a rare earth ion and a nonionic ligand, a nonionic compound substitutable for the nonionic ligand, and a polymer or a solvent.SELECTED DRAWING: Figure 1

The invention relates to a device (1) for measuring a pressure (P) of a fluid in an elastic medical tube (L) which is transparent at least to light of a certain optical wavelength, comprising • A light source (Q) suitable for emitting at least partially coherent light of the specific optical wavelength for which the elastic medical tube (L) is transparent, and • An at least one-dimensional light-sensitive sensor (S), • Where the optical axes (A Q ,A S) the light source (Q) and the at least one-dimensional light-sensitive sensor (S) are directed onto spatially adjacent points on the elastic medical tube (L), such that at least partially coherent light from the light source (Q), which travels from the inner interface of the elastic medical tube (L) to the at least one-dimensional light-sensitive sensor (S), and at least partially coherent light from the light source (Q), which travels from the outer interface of the elastic medical tube (L) to the at least one-dimensional light-sensitive sensor (S), interferes with each other on the way to the at least one-dimensional light-sensitive sensor (S), • Whereas the at least one-dimensional light-sensitive sensor (S) in operation detects an interference pattern of the light towards the at least one-dimensional light-sensitive sensor (S) which has a dependence on the pressure (P) of the fluid in the elastic medical tube (S).

[Problem] To achieve high output and stable operation in a semiconductor laser-pumped solid-state laser which is provided with an optical wavelength conversion element for converting two solid-state laser oscillation lights into sum frequency. [Solution] An LD-pumped solid-state laser (1) includes: a solid-state laser crystal (19) such as a Pr:YLF crystal; an LD (11) that emits excitation light (L) for pumping the laser crystal (19); and a resonator that resonates the light emitted from the solid-state laser crystal (19). The LD-pumped solid-state laser comprises a wavelength control means, such as a narrow bandpass filter (13), for substantially matching the oscillation wavelength of the excitation light (L) from the LD (11) with the absorption peak wavelength of the solid-state laser crystal (19).　

The application provides a kind of multicore optical fiber distributed sensing system and measurement method, and the multicore optical fiber distributed sensing system includes laser, circulator and optical fiber loop structure, laser is connected with the first port of circulator, and the second port of optical fiber loop structure is connected with circulator;It also includes optical wavelength division multiplexer, first optical detector and second optical detector, the multiplexing port of optical wavelength division multiplexer is connected with the third port of circulator, and the two distribution ports of optical wavelength division multiplexer are connected with first optical detector and second optical detector respectively, and optical wavelength division multiplexer is used to separate Stokes light signal and anti-Stokes light signal in Raman scattering light, first optical detector is used to convert Stokes light signal into Stokes electrical signal, and second optical detector is used to convert anti-Stokes light signal into anti-Stokes electrical signal.The embodiment of the application realizes the fusion of two independent optical fiber sensing systems, and realizes the simultaneous measurement of temperature and bending two parameters.

This invention provides an ultrasonic detection system, method, terminal, and medium based on a phase-shifted fiber optic grating using an optoelectronic oscillator, relating to the field of microwave photonic fiber optic sensing technology. The system includes a laser, a polarization controller, an optoelectronic self-excited oscillation loop, a phase-shifted fiber optic grating, a down-conversion module, and a high-speed data acquisition module. The laser generates a laser signal, which is output to the loop after passing through the polarization controller. When the grating connected to one end of the optical circulator in the loop experiences a phase shift peak shift due to the ultrasonic signal, the loop splits the beam and outputs two target microwave signals. One signal is sent to a phase modulator to maintain oscillation conditions, while the other signal is processed by the down-conversion module and then acquired and analyzed by the high-speed data acquisition module to obtain and analyze the frequency domain sideband modulation signal. Demodulation is used to recover and quantitatively detect the ultrasonic signal. By converting the optical wavelength shift into the modulation characteristics of the electrical domain microwave signal through the loop, the limitations of traditional measurement ranges are overcome, and environmental temperature interference can be suppressed.

An object is to provide a thin beam splitter and an optical wavelength selective switch system including the beam splitter. The beam splitter includes: a light splitting element that splits incidence light into transmitted light and transmitted diffracted light; and a light collimating member for collimating the split light components, in which a splitting angle between the transmitted light and the transmitted diffracted light is 100 or more. As a result, the object is achieved.

The utility model provides a pixel sensor array. The pixel sensor array comprises a photodiode in a substrate, a deep trench isolation structure laterally surrounding the photodiode in the substrate, a diffusion structure in a recess in the substrate, and a doped implantation region in the substrate. The deep trench isolation structure includes a conformal liner, a dielectric layer over the conformal liner, and an elongated metal insert in the dielectric layer. A diffusion structure is over the photodiode and within an inner perimeter of the deep trench isolation structure, and a doped implant region is between the photodiode and the diffusion structure. The diffusion structure can be formed to distribute incident light for a particular optical wavelength and / or a wider range of optical bandwidths, which can improve the quantum effect of the pixel sensor.

The photo-acoustic conversion based sound emitter device has a sound output surface for transmitting sound wave vibrations to a medium outside the device. An optical waveguide, is used to transmit light through an optical path within the device. First and second photo-acoustic conversion volumes, at different distances from the sound output surface, are used for transmitting sound generated in the first and second volume to the medium via the sound output surface, the optical path extending directly or indirectly successively through the first and second photo-acoustic conversion volume. The device comprises an intermediate volume separating the first and second photo-acoustic conversion volumes along the optical path, the intermediate volume having a lower light absorption coefficient than the first and second photo-acoustic conversion volumes; and / or the first and second photo-acoustic conversion volume have a different cross-section area size and / or shape with virtual planes perpendicular to the optical path; and / or the first and second photo-acoustic conversion volumes have different optical absorption coefficients, or a different optical wavelength dependence of these optical absorption coefficients.

The invention provides a radio frequency signal optical fiber synchronous conversion system, and particularly relates to the technical field of signal conversion and transmission. According to the invention, the central station unit platform and the antenna unit platform are interconnected only by adopting one single-core phase-stabilized optical cable, passive optical fiber devices such as an optical wavelength division multiplexer, an optical add drop multiplexer and an optical circulator are fully utilized, an optical path structure is redesigned based on an optical multiplexing technology, and single-core optical fiber two-way transmission of multiple paths of radio frequency signals is realized. And a reliable phase discrimination control module is matched to monitor the link phase drift in real time and feed back and control the delay amount of an optical path to carry out phase tracking compensation of the signal, so that stable-phase optical transmission of the radio-frequency signal is realized. Furthermore, the optical link composition structure under the condition of complex signal transmission is greatly simplified, the problem of inconsistent phase drift of the multi-core optical cable caused by external and self factors is physically avoided through the single-core optical cable interconnection mode, the signal phase is clamped in real time by combining phase monitoring and control, and the signal transmission efficiency is improved. And the signal phase of the radio frequency optical transmission link is ensured to be stable.

The application relates to the technical field of optical communication, in particular to an optical wavelength division demultiplexer capable of flexibly adjusting the angle of incident light rays, which comprises a machine box, a reflecting block, a demultiplexer block, a folding prism and a focusing lens are arranged in the machine box, an incident channel is arranged at the top of the machine box, the incident channel is in communication with the inside of the machine box, the incident channel corresponds to the reflecting block, the demultiplexer block comprises an optical block and a light filter, the reflecting block is slidably arranged in the machine box in the horizontal direction, one side of the reflecting block receiving incident light is provided with a reflecting plate, the reflecting plate is rotatably arranged on the reflecting block, and a limiting component for improving the stability of the reflecting plate is additionally arranged in the machine box. The application aims to strengthen the stability of the reflecting plate of the multiplexer during the adjustment of the angle of incident light rays, thereby effectively ensuring that the signals of the light rays will not be interfered and lost during the reflection process.

The invention discloses an optical module and a related packaging method, the optical module comprises an optical transmit-receive assembly and a pipe cap, the optical transmit-receive assembly comprises a support, a first optical filter, a second optical filter, a third optical filter, a pedestal, an optical excitation chip and an optical receiving chip; the optical excitation chip and the optical receiving chip are arranged on the top surface of the base; the bracket is arranged above the top surface of the base; the first optical filter, the second optical filter and the third optical filter are all connected with the bracket; the first optical filter and the optical excitation chip are correspondingly arranged, the light transmitting wavelength of the first optical filter is consistent with the light emitting wavelength of the optical excitation chip, and the reflection wavelength of the first optical filter is consistent with the light receiving wavelength of the optical receiving chip; the second optical filter and the light receiving chip are correspondingly arranged, and the light transmission wavelength of the second optical filter is consistent with the receiving light wavelength of the light receiving chip; and the third optical filter is arranged above the second optical filter, and the reflection wavelength of the third optical filter is consistent with the receiving optical wavelength of the optical receiving chip. The size of the optical module can be effectively reduced, and the process is simplified.

A system and method for determining blood flow using multi-wavelength photoplethysmography is provided. The method including: receiving the photoplethysmography signals from an optical input sensor positioned to capture the photoplethysmography signals from the skin of a user, the photoplethysmography signals including at least two different optical wavelengths; determining arteriolar pulse transit time using time delays determined between the photoplethysmography signals of different wavelengths; determining skin blood flow as a function of the determined arteriolar pulse transit time; and outputting the skin blood flow.

The invention provides an optical fiber channel waveform level modeling method and system based on a low-complexity Transform. The method comprises the following steps: building a coherent optical wavelength division multiplexing transmission simulation system; generating and collecting input and output signal data under different optical fiber cross-section conditions; preprocessing the original data set to realize dispersion separation; constructing data sets A and B for two-stage training; a low-complexity Transform model including sliding window attention, rotation position coding, a feedforward neural network and a residual connection module is established; training the model; and modeling the optical fiber channel by using the trained model. According to the method, the problems of high calculation complexity and limited modeling capability of the existing Transform in optical fiber channel modeling are solved.