18 results about "Fiber coupler" patented technology

Described herein are systems and techniques for providing photonic devices having efficient optical coupling between waveguides and optical fibers. The photonic devices comprise an edge coupler disposed within a cavity of a photonic integrated circuit (PIC) and a pluggable assembly removably coupled with the edge coupler. The PIC includes a spot size converter optically coupled to a waveguide to expand light received from the waveguide prior to exiting the PIC.

The application relates to a mechanical hand control dispensing field, and discloses a feature recognition guide mechanical hand dispensing method, a computing device and a storage medium, the method comprises the following steps: recognizing a fiber coupler part feature according to a camera shooting tool plate image; when the part feature is identified as a taper area, a shearing pipe opening or a glass pipe opening, adjusting a light source according to a preset light adjustment condition corresponding to the taper area, the shearing pipe opening or the glass pipe opening, shooting a part image through the camera, and recognizing pixel coordinates of the taper area, the shearing pipe opening or the glass pipe opening according to the image; calculating dispensing coordinates of a mechanical hand according to the pixel coordinates of the taper area center, the pixel coordinates of the shearing pipe opening and the pixel coordinates of the glass pipe opening; and dispensing at the dispensing coordinate point through the mechanical hand control dispensing machine, the application adjusts the light source and the camera parameter matched with different part features of the coupler based on different part features, accurately recognizes the coordinates of the different part features, calculates the accurate dispensing coordinates of the mechanical hand, and improves the dispensing accuracy and the dispensing efficiency.

This invention discloses a fiber Bragg grating level sensor based on liquid pressure conversion, comprising a fiber Bragg grating demodulator, a 2×1 fiber coupler, a transmission fiber, and a sensing unit. The sensing unit consists of a strain-sensing fiber Bragg grating, a temperature-compensated fiber Bragg grating, a sealed cylinder, a support beam, a pressure block, a pressure tension frame, a sealing membrane, and a stop. The pressure block and the pressure tension frame convert liquid level changes into longitudinal displacement changes, causing axial strain in the strain-sensing fiber Bragg grating. This results in a drift in the center wavelength of the strain-sensing fiber Bragg grating, and the liquid level height of the container is measured by monitoring this wavelength change. This invention eliminates the influence of temperature on the liquid level measurement results through a temperature-compensated fiber Bragg grating, offering advantages such as a large measurement range, good practicality, simple structure, low cost, good stability, high sensitivity, and safety and reliability, meeting the needs of measuring liquid levels in large storage tanks and other applications.

This invention discloses a laser linewidth measurement device and method based on switchable channel delay self-heterodyne interferometry, belonging to the field of laser linewidth measurement technology. The laser to be measured is incident on a first fiber coupler via an isolator and splits into two paths: one path enters a computer-controlled first and second optical switches via a three-port fiber circulator, switching between different lengths of delay fiber via the first and second optical switches, rotating the polarization state by 90° via a Faraday rotating mirror before returning along the original path, and then restoring the original polarization state via a polarization controller; the other path undergoes frequency shifting via an acousto-optic frequency shifter. The two paths are combined via a second fiber coupler to generate a beat frequency optical signal, which is then acquired by a photodetector for photoelectric conversion and a spectrum analysis module. The computer fits the beat frequency power spectrum corresponding to different delay lengths to obtain the laser linewidth to be measured. This invention has strong anti-interference capabilities and can simultaneously acquire Lorentz linewidth, Gaussian linewidth, and composite linewidth, with a wide linewidth measurement range.

The application relates to the technical field of Raman spectrum detection, in particular to a laser-integrated immersion type Raman probe which comprises a shell and a cover plate, the front end of the shell is provided with an aluminum alloy probe pipe, the outer portion of the aluminum alloy probe pipe is sleeved with a quartz sleeve, the rear end of the quartz sleeve is connected with the shell through a quartz sleeve fixed adapter ring, the rear portion in the shell is provided with a laser, the middle portion in the shell is provided with a plane mirror, the shell is internally provided with a dichroic mirror, the front end of the aluminum alloy probe pipe is internally provided with a focusing lens, the shell is internally provided with a long-wave-pass filter, and the rear portion of the shell is provided with a fiber coupler; the laser is integrated to reduce light loss, the quartz sleeve is used to realize corrosion-resistant immersion type detection, multiple filters are arranged to improve the signal-to-noise ratio, and an adjustable mirror is arranged to reduce the assembly precision requirement.

This invention relates to an interferometric phase demodulation method and system based on a high-reflection-order Fabry-Perot (FP) optical microphone. The system includes a broadband light source, a beam splitting module, an optical path guiding module, an FP optical microphone, an optical path compensation module, an optical intensity adjustment module, a 3x3 fiber coupler, a photoelectric detection module, and a signal demodulation module. This invention suppresses multi-beam interference within the microcavity through cavity length matching; simultaneously, it employs co-source beam splitting and utilizes the optical path compensation module to cancel the physical path difference between the sensing arm and the reference arm. Furthermore, it selectively matches high-order return light using the optical intensity adjustment module, followed by demodulation. This effectively suppresses reflection interference and achieves common-mode noise cancellation, significantly improving the sensitivity, anti-interference capability, and measurement dynamic range of the high-order FP sensor. It is suitable for high-precision monitoring of weak acoustic waves in complex and harsh environments such as transformer oil.

This invention provides a Sagnac-type soil moisture monitoring method based on hollow-core photonic crystal fiber. It utilizes a moisture-sensitive material injected into the hollow-core photonic crystal fiber, employs a Sagnac interference structure, and leverages phase modulation and intrinsic frequency tracking to achieve high-precision measurement and efficient moisture inversion. The method includes the following steps: injecting moisture-sensitive material into the hollow channel of the hollow-core photonic crystal fiber; splitting the light source signal into two beams via a broadband light source through a second fiber coupler; one beam undergoes polarization filtering through a fiber polarizer before entering a first coupler, with the two ends of the first coupler coupled to the two ends of the hollow-core photonic crystal fiber to form a closed fiber loop; the other beam directly enters the fiber loop; a phase modulator is added to one arm of the first coupler, with the modulation frequency matched to the intrinsic frequency of the hollow fiber; the adjustment amount Δf of the phase modulator frequency is measured, and the soil moisture is calculated using Δf.

The application discloses a laser air speed tube device based on Rayleigh scattering laser radar and belongs to the field of laser remote sensing, which comprises an outgoing light path composed of a pulsed fiber laser, a first beam splitter, a beam expander and a launching barrel; a receiving light path comprising an arranged telescopic receiving system, a 2*1 polarization maintaining fiber coupler, a collimating lens, a narrowband interference filter, a polarization beam splitter prism and an F-P etalon, one output of the F-P etalon being provided with a first focusing lens, a second beam splitter and a first signal channel detector, and the other output of the F-P etalon being provided with a third focusing lens, a third beam splitter and a first signal channel detector; and a close-range signal detection light path comprising a common receiving section light path between the 2*1 polarization maintaining fiber coupler of the receiving light path and the second beam splitter and the third beam splitter; the first focusing lens is arranged between the first beam splitter beam splitting light path and the 2*1 polarization maintaining fiber coupler; and the first and second close-range signal detectors are arranged at the rear of the second and third beam splitting light paths respectively.

This invention relates to the fields of ultrafast lasers and quantum optical technology, and provides a fully polarization-maintaining composite cavity mode-locked fiber laser with tunable repetition frequency. It includes a pump source, a hybrid device of a polarization-maintaining fiber coupler and a wavelength division multiplexer, a polarization-maintaining erbium-doped fiber, a saturable absorber, a three-port polarization-maintaining circulator, a chirped Bragg fiber grating, and the polarization-maintaining fiber coupler connected in optical path order to form a seed source main resonant cavity; the three-port polarization-maintaining circulator, the chirped Bragg fiber grating, the fiber collimator, the half-wave plate, and the hybrid device of the fiber collimator and polarization-maintaining fiber coupler connected in optical path order to form a seed source secondary cavity; the fiber collimator, the half-wave plate, and the hybrid device of the fiber collimator and polarization-maintaining fiber coupler are all mounted on an electrically driven displacement stage, and the output mode-locked laser repetition frequency can be tunable by adjusting the relative distance between the fiber collimator and the hybrid device.

The application discloses a single-resonant-cavity double-optical-frequency comb light source based on a double phase shifter, which comprises a polarization maintaining fiber coupler, a polarization maintaining gain fiber, a double phase shifter and an output device connected in sequence through a polarization maintaining fiber, wherein the polarization maintaining fiber coupler is used for outputting optical signals input through different input ends according to requirements through corresponding output ends; the polarization maintaining gain fiber is used for amplifying optical signals excited by pump laser output through the polarization maintaining fiber coupler; the double phase shifter is used for simultaneously constructing nonlinear amplification loop mirrors on the fast and slow axes of the polarization maintaining fiber, so as to generate double optical frequency combs of orthogonal polarizations in a single resonant cavity in a polarization multiplexing mode; and the output device is used for outputting the double optical frequency combs. Therefore, the double phase shifter can be used for realizing wide-range flexible adjustment of a repetition frequency difference of the double optical frequency combs.

This invention relates to the field of star sensor technology, specifically to a single-objective, multi-channel distributed fiber optic imaging star sensor system. The system includes a high-temperature resistant objective lens outside the cabin and an imaging fiber bundle, fiber coupler, detector, and processor inside the cabin. The imaging fiber bundle is connected to the high-temperature resistant objective lens to transmit optical image signals to the cabin. The fiber coupler is connected to the imaging fiber bundle to output multiple identical optical image signals, which are then received and processed by the detector and processor. This invention improves the thermal stability of signal acquisition by placing the high-temperature resistant objective lens outside the cabin and using the imaging fiber bundle to transmit optical image signals to the cabin. The fiber coupler, detector, and processor are placed in a constant-temperature environment inside the cabin for processing. Furthermore, the imaging fiber bundle and fiber coupler split the acquired optical image signals into multiple identical optical image signals, which are then received and processed by multiple detectors in conjunction with the processor, thus meeting the requirements of multi-field-of-view, multi-channel synchronous measurement tasks.

The utility model discloses a polarization maintaining fiber coupler's packaging device, including work table, the top rotation of work table is connected with the rotating board, the bottom fixed connection of work table has motor no. 1, the output shaft of motor no. 1 is fixedly connected with the rotating board, the top fixed connection of rotating board has two mounting plates, the top of two mounting plates all is connected with the moving block of sliding, all be provided with the drive mechanism of drive moving block movement on two mounting plates, one side of four moving blocks all are connected with the rotating cylinder of rotation, all be provided with the clamping mechanism on four rotating cylinders. The utility model discloses, when curing and packaging to polarization maintaining fiber coupler, can effectively avoid the influence that the ultraviolet light that ultraviolet light lamp sent causes to worker, guarantees the health of worker, and can even the curing of polarization maintaining fiber coupler, effectively promotes the packaging quality to polarization maintaining fiber coupler.

A distributed acoustic sensing system can include an optical interferometer. The optical interferometer can include a fiber coupler for splitting an optical light signal, and a fiber delay coil for introducing a controlled time delay in one of the paths. At least one path can form a loop, enabling controlled delay and temporary storage of light, resulting in an interference pattern. The system can gradually mitigate noise or distortion, improving sensitivity of defect detection and / or signal reception quality.

This invention belongs to the field of distributed fiber optic sensing technology, specifically relating to a BOCDA fiber optic sensing device and method based on linearly frequency-modulated pulse pumping. The device includes a laser, fiber coupler, first electro-optic phase modulator, first erbium-doped fiber amplifier, optical isolator, sensing fiber, second electro-optic phase modulator, electro-optic intensity modulator, electro-optic pulse signal modulator, polarization scrambler, second erbium-doped fiber amplifier, optical circulator, optical filter, photodetector, low-pass filter, and data acquisition and analysis system. Because the pump light pulse frequency changes linearly, the change in probe light amplitude over time directly carries Brillouin gain spectrum information, thus avoiding scanning the pump-probe light frequency difference. Therefore, only a one-dimensional scan is needed to complete a measurement, significantly shortening the measurement time of the BOCDA fiber optic sensor.

This invention relates to a high-fidelity optical pulse signal cyclic replication device, belonging to the field of optical communication. The device includes a 2×2 3dB fiber coupler, a 1×2 3dB fiber coupler, a high-speed optical switch, an optical switch drive control board, an optical isolator, a 1×2 fiber coupler, a fiber circulator, an electrically controlled delay line, a delay fiber, a reflector, a fiber amplifier, and a chassis. The coupling ratio of the 1×2 fiber coupler is 10% / 90%. This invention employs a fiber amplifier to compensate for insertion loss in the fiber loop, theoretically ensuring equal amplitude output. A high-speed optical switch is used to solve the problem of excessive noise accumulation after multiple replications, effectively zeroing loop noise. A narrowband optical filter is used to effectively suppress noise in the loop. Simultaneously, a high-reflectivity reflector is used to form a reflective structure, making the delay time twice that of unidirectional transmission.

Described herein are robust fiber-connection structures for photonic integrated circuits (PICs). These fiber connection structures enable efficient optical coupling between integrated waveguides defined near an edge of a PIC and corresponding optical fibers, thereby facilitating reliable edge coupling. The fiber-connection designs developed by the inventor improve upon conventional approaches by minimizing damage associated die-sawing processes, reducing surface roughness and preventing underfill intrusion into the edge coupling region.

A picosecond pulse nonlinear compression device based on a multi-pass cell achieves the advantages of high energy, compactness, and low cost, realizing femtosecond-level pulsed lasers at kilohertz repetition rates. A picosecond pulsed fiber laser generates stable mode-locked picosecond pulses with repetition rates of tens of megahertz. These pulses are injected into a solid-state regenerative amplifier via a fiber coupler, selectively amplifying the output signal to generate millijoule-level picosecond pulses with kilohertz repetition rates. The pulses then enter a mode matching module, which matches the mode of the incident laser with the eigenmode of the MPC cavity. Afterward, the pulses are injected into a spectral broadening module, which is filled with a nonlinear medium liquid to broaden the incident laser spectrum. Finally, the pulses are injected through convex mirrors into a chirp compensation module, which includes multiple pairs of parallel chirped mirrors to compensate for dispersion in the broadened pulsed laser spectrum.

Described herein are robust fiber-connection structures for photonic integrated circuits (PICs). These fiber connection structures enable efficient optical coupling between integrated waveguides defined near an edge of a PIC and corresponding optical fibers, thereby facilitating reliable edge coupling. The fiber-connection designs developed by the inventor improve upon conventional approaches by minimizing damage associated die-sawing processes, reducing surface roughness and preventing underfill intrusion into the edge coupling region.