132 results about "Optical wavelength" patented technology

The invention discloses a temperature control and noise reduction method for an analog optical module, and relates to the technical field of data processing. The method comprises the following steps: collecting and preprocessing an original temperature signal, environment temperature time sequence data and an optical wavelength original detection value of an optical module; improving the LSTM model, constructing a junction temperature dynamic prediction model, and outputting prediction data; a pre-trained BP neural network is utilized to calculate the temperature compensation amount according to the real-time wavelength offset, and a PPO reinforcement learning algorithm is adopted to optimize with the temperature stability, the wavelength offset and the TEC power consumption as multiple targets to obtain an optimal PID parameter mapping table; and finally, predicting, compensating and optimizing parameters are fused, and control output for driving the TEC is generated through a multi-mode intelligent decision. The problems of insufficient control precision and response lag are effectively solved, cooperative high-precision control over the junction temperature and the emission wavelength of the laser is achieved, transmission noise is remarkably reduced, and meanwhile system energy consumption and the self-adaptive capacity are considered.

The invention discloses an intelligent quality inspection system for medicinal empty capsules, particularly relates to the field of intelligent detection, and comprises a multi-dimensional optical characteristic acquisition module, a dynamic thermodynamic response analysis module, a near infrared spectrum component inversion module, a multi-source data fusion decision module and a self-adaptive feedback optimization module. Omnibearing nondestructive detection of the capsule is realized through non-contact multispectral imaging and vibration response analysis, traditional destructive sampling loss is thoroughly avoided, and the multisource data fusion module integrates optical texture features, mechanical frequency domain energy density and near infrared spectrum inversion values based on the D-S evidence theory, so that the detection accuracy is improved. And the self-adaptive optimization module dynamically adjusts an optical wavelength weight, a mechanical sweep frequency range and a spectrum modeling parameter by applying reinforcement learning, is self-adaptive to fluctuation of different batches of gelatin materials and environmental interference, remarkably reduces a misjudgment rate and ensures continuous and stable operation of a production line.

The invention belongs to the technical field of optical communication testing, and provides a multichannel synchronous optical wavelength scanning test module and a data fusion system thereof, the multichannel synchronous optical wavelength scanning test module comprises a scanning light source, a multichannel scanning optical power meter, a wavelength analysis unit, a polarization controller, a trigger synchronization unit and an integrated platform; the scanning light source is configured to provide a basic light source; the multi-channel scanning optical power meter is configured to measure optical power of a plurality of channels at the same time to obtain optical power data; the wavelength analysis unit is configured to perform wavelength analysis on the optical signal output by the basic light source so as to determine the wavelength value of the optical signal; the trigger synchronization unit is configured to realize linkage control between the scanning light source and the polarization controller to form polarization state-wavelength cooperative scanning so as to synchronously complete wavelength scanning and switching of multiple polarization states; the integrated platform is configured to perform unified control and management; according to the invention, high-precision and high-efficiency multichannel optical wavelength scanning test can be realized.

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.

A flexible optical fiber ribbon and a bonding effect testing system and method thereof. The flexible optical fiber ribbon comprises multiple optical fibers arranged side by side, and intermittent bonding portions are arranged between adjacent optical fibers; the transmittance of the intermittent bonding portions to the testing optical wavelength band is 50% or below; an optical fiber coating layer is wrapped by a colored layer, and the colored layer is wrapped by a light transmissive layer; the transmittance of the colored layer to the testing optical wavelength band is 30% or below, and the transmittance of the light transmissive layer to the testing optical wavelength band is 85% or above; and the bonding portions having standard conforming bonding effect cover the light transmissive layer in the direction of the testing light. In the present invention, a photosensitive component is used in conjunction to implement continuity testing by utilizing an optical signal, and thus the sensitivity, accuracy, and speed far exceed imaging testing. In the present invention, an optical signal continuity test is used to avoid defects such as image smearing and image retention caused by traditional imaging testing, significantly increasing testing efficiency, removing the manufacturing speed bottleneck caused by quality monitoring in a production line, and enhancing the manufacturing efficiency.

Some examples described herein provide for controlling an output modulation magnitude of an optoelectronic device. In an example, a method includes transmitting a data pattern to an optical modulator device. The method further includes, for each of a plurality of heater control values of a heater thermally coupled with the optical modulator device, identifying an optical modulation magnitude corresponding to the heater control value based on a corresponding photodiode current value identified in the transmission data mode. The method further includes determining a maximum optical modulation amplitude of the optical modulator device based on the plurality of optical modulation amplitudes corresponding to the plurality of heater control values in accordance with the identification. The method further includes controlling the heater based at least in part on the determined maximum optical modulation magnitude that has been modified according to the scaled maximum photodiode current value.

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 relates to an integrated photonic device (100) configured for near-perfect second harmonic generation (SHG) at a resonant optical wavelength λ. The device includes a substrate (S), a first (101) and second (109) distributed Bragg reflector (DBR) made of alternating layers with different refractive indices (103, 105), and a monolayer of MoS2 (ML MoS2) as the nonlinear material sandwiched between identical insulating layers (102). The device utilizes a Fabry-Perot cavity configuration, enhancing the electric field at λ, ensuring maximum SHG efficiency. The phase matching condition is satisfied due to the sub-nm thickness of MoS2 layer of 0.62 nm. The device is an SHG device with an input at 1550 nm and an output at 775 nm, with SHG conversion efficiencies higher than 99%. Ultra high nonlinear susceptibility of MoS2 also optimizes SHG performance, and the device is therefore very efficient for photonic applications.

This invention provides a vertical-cavity surface-emitting laser (VCSEL) for high-speed communication and its fabrication method. The VCSEL comprises an epitaxial wafer, an oxide layer, an electrically insulating region, a dielectric layer, and P and N metal layers. The VCSEL structure satisfies the following: 1. The epitaxial wafer includes a resonant cavity with a total thickness of 1 / 2 optical wavelength. The oxide layer is formed on the active region of the resonant cavity. 2. The electrically insulating region is formed by ion implantation and extends from top to bottom below the active region of the resonant cavity. 3. The relief structure described in the above embodiment is set near the output aperture. The combination of these three structural characteristics enables a single-mode VCSEL for high-speed modulation. By etching the relief structure on the surface of the output aperture, the dielectric and non-dielectric regions spaced apart provide different overall reflectivities, enabling filtering of higher-order modes, thereby forming a single-mode output.

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.

The application belongs to the technical field of optical communication testing, and provides a multi-channel synchronous optical wavelength scanning test module and a data fusion system thereof. The multi-channel synchronous optical wavelength scanning test module comprises a scanning light source, a multi-channel scanning optical power meter, a wavelength analysis unit, a polarization controller, a trigger synchronization unit and an integrated platform. The scanning light source is configured to provide a basic light source. The multi-channel scanning optical power meter is configured to simultaneously measure the optical power of multiple channels to obtain optical power data. The wavelength analysis unit is configured to analyze the wavelength of the optical signal output by the basic light source to determine the wavelength value of the optical signal. The trigger synchronization unit is configured to realize linkage control between the scanning light source and the polarization controller to form polarization state-wavelength collaborative scanning, thereby synchronously completing wavelength scanning and switching of multiple polarization states. The integrated platform is configured to be uniformly controlled and managed. The application can realize high-precision and high-efficiency multi-channel optical wavelength scanning testing.

A photosensitive resin composition capable of obtaining excellent whiteness, reflectivity, resolution, and high sensitivity, a dry film, a cured product, and an electronic component. The photosensitive resin composition is a photosensitive resin composition containing a carboxyl-containing resin (A), a phosphorus-based photopolymerization initiator (B), a photobleaching oxime ester-based photopolymerization initiator (C), and titanium oxide (D), wherein the photobleaching oxime ester-based photopolymerization initiator (C) has an absorbance of 0.01-0.20 in THF, at a concentration of 200 ppm, and at an optical wavelength of 405 nm, and has an absorbance of 0.10-1.00 at an optical wavelength of 385 nm, and with respect to 100 parts by mass of a solid component, namely, the carboxyl-containing resin (A), the blending amount of the photobleaching oxime ester-based photopolymerization initiator (C) is 0.2-1.5 parts by mass.

A wavelength division multiplexing (WDM) optical interconnect system may comprise a frequency comb generator configured to generate multiple optical wavelengths. A demultiplexing optical spectrometer may separate the multiple optical wavelengths. A processor chip may comprise a plurality of optical waveguides and modulators. The optical waveguides may direct individual optical signals to the modulators. The modulators may be internal to and integral with the processor chip. Output waveguides may direct modulated optical signals to separate networked devices. The modulators may be arranged in a three-dimensional array within the processor chip. The demultiplexing optical spectrometer may comprise an input for receiving optical signals, a collimating lens, a diffraction grating, and an output focusing lens. The input for receiving optical signals may be arranged in a two-dimensional array. The diffraction grating may direct multiplexed wavelengths embedded in each input optical signal to a linear array of single-wavelength optical signals.

The present invention concerns an optoelectronic device, in particular an optical wavelength-converter or an infrared (IR) emitting or IR photodiode device, comprising an organic matrix-based material, wherein the organic matrix-based material is coated with at least one layer comprising an amorphous fluoropolymer. The invention also pertains to a method for the production of such an optoelectronic device.

The application discloses a method for improving wavelength stability of a fiber-optic gyroscope and the fiber-optic gyroscope, and the method comprises the following steps: S1, light output by a light source travels back to an integrated optical modulator after reaching a fiber ring, and interference light is formed; S2, the interference light is divided into one high-power light and one low-power light through a second optical fiber coupler; S3, after receiving the low-power light, an optical wavelength detector is converted into an electrical signal and output to a wavelength signal amplifier for amplification; S4, the wavelength signal amplifier outputs the amplified signal to a light source driving circuit; and S5, the light source driving circuit adjusts the driving current of the input light source according to the signal input by the wavelength signal amplifier. The application adjusts the light power through an optical attenuator, acquires the optical wavelength information through an optical wavelength detector, and adjusts the wavelength of the fiber-optic gyroscope according to the optical wavelength information, so that the wavelength stability of the fiber-optic gyroscope is improved under the premise of maintaining the light power stability, and the scale factor stability of the fiber-optic gyroscope is further improved.

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.

The invention provides a spectral measurement method and system based on a linear adjustable optical filter, and the method comprises the steps: building a pixel-wavelength calibration curve of a spectrum detection system based on the spectrum detection system constructed by a white light source, a linear optical filter and a detector; calculating the light transmittance of the whole spectrum detection system; collecting a to-be-measured light source by using a spectrum detection system to obtain a relationship between the intensity of the to-be-measured light source and a pixel point; and obtaining the distribution of the intensity and wavelength of the light source to be measured according to the relationship between the intensity of the light source to be measured and the pixel points and based on the established pixel-wavelength calibration curve, the light transmittance and a system spectrum calculation formula. According to the grating-free spectrum detection method based on the linear adjustable optical filter, spectrum reduction is achieved on the detection result of the detector, the pixel point-intensity relation is converted into the wavelength-intensity relation, the structure and principle are simple, the price is low, and the grating-free spectrum detection method is suitable for the fields of scientific research, precise optical measurement, unknown optical wavelength analysis and the like.

Some examples described herein provide for controlling output modulation amplitude for optoelectronic devices. In an example, a method includes transmitting a data pattern to an optical modulator device. The method also includes identifying, for each heater control value of a plurality of heater control values for a heater thermally coupled with the optical modulator device, an optical modulation amplitude corresponding to the heater control value based on a corresponding photodiode current value identified while transmitting the data pattern. The method also includes determining a maximum optical modulation amplitude for the optical modulator device based on a plurality of optical modulation amplitudes corresponding to the plurality of heater control values according to the identifying. The method also includes controlling the heater based at least in part on the determined maximum optical modulation amplitude that has been modified according to scaling maximum photodiode current values.