242 results about "Multimode fibre" patented technology

The invention relates to an optical fiber hydrogen sensor based on a silver film-nanowire hole array structure and a preparation method thereof in the field of photochemical sensors. The optical fiber hydrogen sensor comprises a multimode optical fiber, and a sensing area is formed on the multimode optical fiber; the sensing area is formed by stripping a coating layer with a preset length from the multimode optical fiber, thinning the optical fiber in the area, plating a silver film on the surface of the thinned optical fiber, and adsorbing a nanowire hole array structure which is sequentially and vertically arranged on the surface of the silver film in a liquid level self-assembly manner; the nanowire hole array is of a metal-medium-metal (MIM) structure, a gold-palladium nanowire array is arranged at the bottom, an intermediate medium layer is made of aluminum oxide, and a silver film with a hole array in any shape is arranged at the top. When light is transmitted to a sensing area from a fiber core of the multimode optical fiber, the light and a metal silver film can excite a surface plasmon resonance (SPR) effect, meanwhile, an MIM structure formed by a gold-palladium nanowire, an aluminum oxide dielectric layer and a porous silver film serves as an optical coupling antenna through a local surface plasmon resonance (LSPR) effect at the edge of a top hole, and the optical coupling antenna is used for transmitting the light to the sensing area. Light energy is efficiently converged and excited in an extremely bound gap plasmon (Gap Plasmon) in an aluminum oxide dielectric layer, so that far-unconventional electromagnetic field enhancement is generated in a sensing core area, and the sensitivity of the sensor is greatly improved.

The invention relates to the field of data transmission, in particular to a multimode optical fiber image transmission method, system and device and a medium. The method comprises the steps of acquiring an original image of a target area through image acquisition equipment of the power transmission line operation robot; converting the original image into an optical signal and transmitting the optical signal through a multimode optical fiber to generate a speckle image with spatial disturbance characteristics; inputting the speckle image into a neural network model constructed based on a sliding window self-attention mechanism for image reconstruction; the reconstructed image is output to a power transmission line state analysis system for real-time monitoring; the sliding window self-attention block calculates local self-attention features in windows with fixed sizes through window multi-head self-attention and sliding window multi-head self-attention mechanisms which are alternately arranged, and feature interaction between adjacent windows is achieved through a sliding window mechanism. According to the method, the anti-interference capability and the dynamic environment adaptability are improved, the calculation complexity is reduced, and the model generalization capability is improved.

The invention discloses a computational imaging method and system based on multimode optical fiber mode modulation, and the method comprises the steps: designing and building a multimode optical fiber image transmission system, and collecting a natural scene speckle image data set under different transmission conditions through replacing multimode optical fibers modulated in different modes; an optimized network architecture based on a UNET network is constructed, and a deep learning network adopting a series double-subnet structure is constructed for performing feature extraction and image reconstruction from a speckle image to an SLM image and from the SLM image to a real image, and learning complex speckle image features; training a deep learning network based on natural scene speckle image data sets in different mode modulation states, and introducing a joint loss function to optimize the reconstruction performance of the network; the speckle image verification model under different transmission conditions is utilized to reconstruct the quality of the image; according to the invention, the target information in the speckle image is enhanced through mode modulation, and high-quality image reconstruction is realized by using the deep learning network.

The invention relates to the technical field of bionic touch sensors, in particular to a touch pain sense sensor based on double-layer heterogeneous optical fiber sharpness perception and a preparation method. The touch pain sense sensor comprises an SGS-MZI structure which is formed by welding a single-mode optical fiber, a step type multimode optical fiber and a gradual change type multimode optical fiber and is used for realizing shallow touch pressure detection; the MNF structure is located under the SGS-MZI structure; the MNF structure is a non-adiabatic conical structure obtained by fused biconical taper of a single-mode fiber, and is used for realizing deep contact pressure and sharpness detection; the middle supporting layer is located between the SGS-MZI structure and the MNF structure; and the SGS-MZI structure and the MNF structure are fixedly arranged on the top surface and the bottom surface of the middle supporting layer respectively. According to the invention, through a double-layer heterogeneous structure based on the sandwich structure multimode fiber Mach-Zehnder interferometer (MZI) and the MNF, sharpness identification and touch pain perception functions are realized, so that the detection performance of the bionic touch sensor is improved.

The utility model relates to the technical field of optical devices, in particular to a multimode short-distance optical device, which comprises a circuit board, a light emitting element, a light receiving element, a cushion block, a thermoelectric refrigerating unit and an optical lens. The light emitting element and the light receiving element are both arranged on the cold face of the thermoelectric refrigerating unit, the light emitting element is a vertical cavity surface emitting laser, and the optical lens is arranged on the emergent light path of the light emitting element and the incident light path of the light receiving element. And the reflector is used for reflecting and focusing the emitted light of the light emitting element into the multimode optical fiber and reflecting and focusing the incident light of the multimode optical fiber into the light receiving element. According to the utility model, a flexible assembly form is provided, the temperature of the heating element can be effectively controlled, and the problems of low efficiency and low precision in the aging process are solved; in addition, by arranging the light paths on the same stable structure, stable support is provided for the light paths, and the stability of the light paths is improved.

The invention provides a spatial optical coupling efficiency rapid assembling and correcting method based on multimode optical fiber receiving, and solves the problems that the spatial translation and angle of an optical fiber end face need to be repeatedly and manually adjusted in an existing assembling and correcting method, single-time adjustment needs to consume more than 2 hours and needs to depend on experience of an operator; moreover, the precision deviation of manual reset can reach + / -5 [mu] m, resulting in that the coupling efficiency fluctuation exceeds + / -10%, and the consistency requirement in batch production is difficult to meet, and can be widely applied to the field of laser communication. The method specifically comprises the following steps: connecting a multimode fiber with a laser, and receiving a light beam refracted by a coupling receiving lens group by using a light beam analyzer; adjusting the position of a transmitting platform of the multimode optical fiber for multiple times, and recording the size and roundness of the light spot after each adjustment through an upper computer; in the recorded size and roundness data of the light spot, determining the relative minimum value of the size of the light spot when the roundness of the light spot is greater than 0.87; and the position of the emission platform with the relative minimum light spot size is used as the optimal installation and calibration position.

The invention relates to a respiration monitoring sensor, device and method based on an optical fiber micro lens. The respiration monitoring sensor comprises a multimode optical fiber and a long-afterglow fluorescent flexible film, a fixed distance is directly kept between the top end of the multimode optical fiber and the long-afterglow fluorescent flexible film, the top end of the multimode optical fiber is a fluorescent signal acquisition end, and the tail end of the multimode optical fiber is a fluorescent signal output end; the long-afterglow fluorescent flexible film can continuously emit fluorescence after being excited by ultraviolet high-energy radiation; the breathing monitoring device further comprises a breathing mask, a fluorescence signal acquisition module and a PC end with built-in photon counting software. The sensor is fixed in the breathing mask, and exhaled gas can directly impact the long afterglow fluorescent flexible film; the tail end of the multimode optical fiber is led out of the breathing mask and is connected to a fluorescence signal input end of the fluorescence signal acquisition module; the fluorescence signal acquisition module is used for receiving optical signals and realizing photon counting; and the PC end realizes real-time reconstruction and display of respiration waveforms through a photon counting software platform.

The invention provides a photoacoustic pumping imaging system based on pulse laser phase energy correction. The opto-acoustic pumping imaging system based on pulse laser phase energy correction comprises a 128-channel array ultrasonic acquisition system, two OPO tunable lasers and a digital delay pulse generator which form the opto-acoustic pumping imaging system, a 128 array element linear ultrasonic transducer and a 2 * 2 multimode fiber bundle; and a pulse laser phase energy correction system which needs to monitor and correct the phase of the laser pulse. The opto-acoustic pumping imaging system based on pulse laser phase energy correction provided by the invention realizes accurate phase correction and energy normalization based on precise synchronization of two acquisition systems, so that the system can significantly reduce the fluctuation of TTD data, improve the stability and reliability of results, improve the acquisition speed and signal-to-noise ratio of the system, and improve the imaging quality of the system. The detection limit is reduced.

The invention provides an energy and signal co-transmission system based on photo-thermal electricity, the system comprises a plurality of lasers, a composite optical cable and a sensing and monitoring integrated module, the composite optical cable comprises a multimode optical fiber and a single-mode optical fiber, and the sensing and monitoring integrated module comprises a photo-thermal composite battery, an energy management unit and a sensing monitor which are connected in sequence; the plurality of lasers emit laser signals of a plurality of near-infrared bands, and the plurality of laser signals are transmitted to the photo-thermal composite battery through the multimode optical fiber; the photo-thermal composite battery converts a plurality of received laser signals into electric energy, collects waste heat generated in the energy conversion process and converts the collected waste heat into electric energy, and all the electric energy output by the photo-thermal composite battery is stored through the energy management unit to supply power to the sensing monitor; monitoring control information sent by a user side is transmitted to the sensing monitor through the single-mode optical fiber, and the sensing monitor collects monitoring information based on the monitoring control information and transmits the monitoring information to the user side through the single-mode optical fiber.

The invention belongs to the technical field of biomedical engineering measurement, and discloses a diffused light tissue imaging blood oxygen-blood flow synchronous and same-position acquisition device which comprises a three-wavelength near-infrared laser, a plurality of multimode optical fibers, a first optical switch, a second optical switch, a plurality of Y-shaped optical fibers, a DOS / DOT photon detector module and a DCS / DCT photon detector module. The output end of the three-wavelength near-infrared laser is connected with one end of each multi-mode optical fiber through the first optical switch, and the other end of each multi-mode optical fiber is arranged on the surface of a measured medium; the common end of each Y-shaped optical fiber is arranged on the surface of a detected medium, a first branch port of each Y-shaped optical fiber is connected with the DOS / DOT photon detector module through the second optical switch, and a second branch port of each Y-shaped optical fiber is connected with the DCS / DCT photon detector module through the second optical switch. According to the invention, DOS / DOT and DCS / DCT are fused, simultaneous and same-position acquisition of tissue blood flow and blood oxygen signals is realized, the dimension of clinical information measured by a diffused light technology is widened, and the accuracy of oxygen metabolism rate calculation is improved.

The invention provides a probe type optical fiber SPR (Surface Plasmon Resonance) sensor system based on a microsphere structure. The probe type optical fiber SPR sensor is characterized in that the probe type optical fiber SPR sensor is composed of a broadband light source, a spectrograph, a broadband circulator and a microballoon structure probe type optical fiber SPR sensor, the microballoon structure probe type optical fiber SPR sensor is formed by welding a multimode optical fiber with a section of single-mode optical fiber, and the single-mode optical fiber at the welding position of the multimode optical fiber and the single-mode optical fiber is prepared into the microballoon structure; the nano-silver film is deposited on the surface of the single-mode optical fiber, the polydimethylsiloxane film and the polyvinyl alcohol film are coated section by section along the outer surface of the nano-silver film, and the nano-gold film is plated on the end face of the tail end, so that the temperature parameter and the humidity parameter can be simultaneously measured in various sensing application scenes. The device is simple in structure, flexible and compact, and can be widely applied to the optical fiber sensing application fields of chemistry, biology, medicine, life science and the like.

The present application relates to a kind of end sensor and tactile feedback type interventional catheter and its autonomous navigation method, the end sensor includes hemispherical light waveguide, compound eye array lens, multimode optical fiber and optical fiber image bundle, the front end of the optical fiber image bundle is equipped with compound eye array lens, the front of the compound eye array lens is equipped with hemispherical light waveguide, its bottom is placed four multimode optical fibers along circumference and certain incident angle is made into light waveguide, so that optical fiber end surface and light waveguide bottom surface coincide;The tactile feedback type interventional catheter is built-in the end sensor, based on the wide-angle imaging function provided by compound eye array lens and the force feedback function provided by light waveguide contact causes light leakage, can autonomously navigate and provide accurate force feedback and contact point position, need not guide wire as guiding device, can directly intervene blood vessel and in the intervention process, real-time feedback catheter and blood vessel wall contact mechanics information and position information, and change catheter intervention direction as required.

A photonics device is described. The photonics device includes a waveguide and an electrode. The waveguide configured to transmit an optical signal having a wavelength less than 1100 nanometers and is a single mode waveguide. The waveguide includes electro-optic material(s). The electrode is proximate to a portion of the waveguide and configured to carry an electrode signal for modulating the optical signal. The photonics device is configured to be coupled with at least one multimode fiber. The multimode fiber(s) is configured to transmit a plurality of modes.

The invention relates to a broadband bending-resistant multimode optical fiber and a preparation method thereof, the refractive index profile of a core layer is in a gradually-changed parabola shape, the distribution index alpha is 1.95-2.65, the radius R1 of the core layer is 12-35 microns, the delta 1max is 0.9%-1.4%, the relative refractive index difference delta 1min at the R1 position of the edge of the core layer is-0.16%--0.06%, cladding layers comprise an inner cladding layer, a first sunken cladding layer, a second sunken cladding layer and an outer cladding layer from inside to outside in sequence, the inner cladding layer is sequentially provided with a first inner cladding layer and a second inner cladding layer from inside to outside, the single-side width (R4-R3) of the first sunken cladding layer is 1.5-9.0 [mu] m, delta 4 is-1.1%--0.60%, the single-side width (R5-R4) of the second sunken cladding layer is 1.0-3.0 [mu] m, delta 5 is-1.0%--0.55%, the radius R6 of the outer cladding layer is 60-65 [mu] m, and delta 6 is-0.12-0.12%. The core cladding is reasonable in structural design, has the excellent characteristics of high bandwidth, strong bending resistance and low attenuation, and is high in transmission efficiency and excellent in long-term stability and reliability.

The invention discloses an optical fiber single-pixel imaging method and device based on sparse optimization and neural network fusion, and the method comprises the steps: constructing a collimation illumination system, carrying out the spatial modulation of incident light, introducing a collimation illumination mechanism, and obtaining a spatial speckle illumination light field of a multimode optical fiber; performing sparsity extraction analysis on the spatial speckle illumination light field by using a sparse optimization algorithm, removing a high redundancy mode, and selecting a speckle illumination mode with the lowest cross correlation; a speckle illumination mode after sparse optimization is used as input, a neural network model constructed based on a soft threshold iterative algorithm is trained, and an optical fiber single-pixel image reconstruction model is established; performing sparse optimization speckle illumination on a target object, acquiring corresponding total light intensity response data, inputting the data into the trained optical fiber single-pixel image reconstruction model, realizing image reconstruction and outputting a final target image; the method has anti-defocusing capability and anti-disturbance robustness, and can still keep good optical fiber single-pixel image reconstruction performance under the condition of low sampling rate.

An object of the present disclosure is to provide a few-mode fiber testing method and a few-mode fiber testing device capable of acquiring a loss and inter-mode crosstalk for each mode at a connection point of a few-mode fiber by measurement only from one end of FUT. The few-mode fiber testing method according to the present disclosure includes receiving a test light pulse in a basic mode from one end of an optical fiber under test that is connected in series with few-mode fibers of the same type, measuring an intensity distribution relating to a distance from the one end of backward Brillouin scattering light generated by receiving a test light pulse, obtaining a transmittance of the backward Brillouin scattering light at a connection point of the optical fiber under test from the measured intensity distribution, and calculating a connection loss of the basic mode from the transmittance, calculating a ratio of an axial deviation amount to a mode field radius of the optical fiber under test at the connection point from the calculated connection loss, and calculating a connection loss of a higher-order mode and inter-mode crosstalk between different modes from the calculated ratio.

The invention discloses a surface plasmon resonance (SPR) hydrogen sensor based on an Ag / PDMS / Pt-WO3 multilayer structure. The SPR hydrogen sensor is characterized by comprising a halogen lamp light source, two sections of multimode optical fibers, a spectrometer and an SPR hydrogen sensing head, wherein the SPR hydrogen sensing head is composed of a different-core structure formed by multimode-single-mode-multimode optical fibers, a silver film, PDMS (polydimethylsiloxane) and Pt-WO3 (platinum-tungsten trioxide). The SPR hydrogen sensor based on the Ag / PDMS / Pt-WO3 multi-layer structure, which is simple to prepare, high in sensitivity and capable of being repeatedly used for a long time, is provided aiming at the defects that an existing optical fiber SPR hydrogen sensor is low in sensitivity and complex in device manufacturing, and PdH is changed from an alpha phase to a beta phase when Pd is used as a hydrogen sensitive material, so that the use of the device is influenced, and the like. When the hydrogen concentration is increased, the Pt-WO3 reacts with the hydrogen to generate heat, so that the refractive index of the PDMS film is changed, the SPR resonance spectrum is moved, and the hydrogen concentration is obtained by observing the offset of the PDMS film. The high refractive index sensitivity of SPR is brought into full play by utilizing the high refractive index change of PDMS, so that high-precision detection of hydrogen leakage is realized.

A system and a method for regulating a living tissue cell are provided. The system includes: a laser source module, a modulation module, an optical fiber module, an imaging module, and a control module. The modulation module is configured for modulating the received first laser based on a preset modulation strategy to determine a regulation light and modulating the received second laser based on the preset modulation strategy to determine an imaging light, wherein the preset modulation strategy refers to a strategy for wavefront modulation of the first laser and the second laser. The regulation light or the imaging light is output to the deep area of living tissue through the multimode optical fiber in the optical fiber module.

The invention discloses an MXene-based dual-channel cascade coreless optical fiber SPR sensor and application thereof, the sensor is formed by cascading a multimode optical fiber with two sections of coreless optical fibers, the NCF area of the channel 1 is only coated with a gold film, and the NCF area of the channel 2 is coated with a gold-cysteamine-MXene composite film. Theoretical analysis shows that when the NCF lengths of the channel 1 and the channel 2 are 5 mm and 12 mm respectively, the visibility of formants is optimal, and the distance between the formants can be increased by increasing the thickness of MXene. Experiments show that in the refractive index range of 1.333-1.366, the optimal number of layers of MXene is four, at the moment, the RI sensitivity of a channel 1 and the RI sensitivity of a channel 2 reach 1894.27 nm / RIU and 4001.48 nm / RIU respectively, and the FOM is 16.86 RIU <-1 > and 32.99 RIU <-1 > respectively. The device is simple in structure, low in cost and convenient to operate, and has good application potential in the field of two-parameter biochemical sensing.

The invention discloses a satellite-ground laser communication atmospheric channel compensation system and method. Relates to the technical field of satellite-ground laser communication, in particular to a satellite-ground laser communication atmospheric channel compensation system and method. Through structural coupling and parameter matching, deep collaboration of the multimode fiber and the MPLC is realized, and the optical signal coupling efficiency in the turbulent environment is remarkably improved on the premise of reducing the complexity, power consumption and cost of the system. In the system, a receiving module captures and focuses a multi-mode optical signal emitted by a satellite to a transmission connection module through a coupling lens group; the transmission connection module receives and transmits the multi-mode optical signal to the multi-mode input end of the MPLC through the fiber core of the multi-mode optical fiber; and the modal screening module decomposes a multi-modal optical signal received by the multi-modal input end of the MPLC through the MPLC optical mode demultiplexing module to obtain a plurality of modal fundamental modes, and outputs the fundamental modes through the MPLC single-mode output end.

This invention belongs to the field of fiber optic sensing and relates to a method based on WS 2 A temperature sensor based on all-fiber fluorescence intensity comprises a single-mode fiber, a three-hole grapefruit fiber, and a multimode fiber connected in sequence; the three-hole grapefruit fiber has three air holes, in which WS is deposited. 2 The multimode fiber output end is equipped with a mounting base, on which a filter is mounted. This invention utilizes WS... 2 Assembled within a three-hole optical fiber, with single-mode and multi-mode fibers fused together at both ends, this sealed structure effectively isolates the sensor from external air, preventing contact between the outside air and the two-dimensional material on the inner wall of the fiber during heating. This slows down the decomposition of transition metal sulfides, significantly improving the fluorescent sensor's ability to detect high temperatures and extending its lifespan. The sensor itself and its detection system are coupled and output via optical fiber, eliminating the need for external spatial light or optical modulation.

The utility model provides an HDMI video multimode optical fiber SWDM transmitter, which relates to the technical field of transmission equipment, and comprises an optical fiber video extender, a transmitter, a receiver and an electric signal path, the transmitter is connected with an HDMI Source end, the receiver is connected with an HDMI Sink end, the transmitter and the receiver are connected through an optical fiber, and the problem that the HDMI high-definition line is only 15m in longest length and is not long enough is solved by adopting a mode of installing the optical fiber video extender. An HDMI signal is attenuated and the video quality is influenced when the HDMI signal exceeds 15 meters, but in daily work and life, a video is generally required to be transmitted to a place of dozens of meters and even hundreds of meters, so that the video signal is required to be prolonged and controlled, and when the existing HDMI extender is used for transmitting the video signal for a long distance, the image ghosting is easy to occur, and the video quality is influenced. And the definition and the fidelity of the video are difficult to guarantee, so that the user experience is reduced.

The invention relates to a miniaturized near-infrared spectrometer imaging system, which relates to the field of near-infrared spectrometers, and comprises a light source module, a sample light generation module, an optical fiber coupler, an optical fiber F-P filter, a photoelectric detector and a multimode optical fiber, light rays generated by the light source module can irradiate a sample through the sample light ray generation module and generate sample light rays, the optical fiber coupler and the optical fiber F-P filter are connected through multimode optical fibers, the optical fiber F-P filter and the photoelectric detector are connected through multimode optical fibers, and the optical fiber coupler receives sample optical fibers; and the signal is transmitted to the photoelectric detector through the multimode optical fiber, the optical fiber F-P filter and the multimode optical fiber. According to the invention, the baseline drift and noise of the spectrum are reduced, the accuracy of the spectrum is improved, the size is smaller, and the weight is lighter.

This optical amplifier comprises: a rare-earth-doped optical fiber; an excitation light coupler that inputs signal light and excitation light to the rare-earth-doped optical fiber; a multimode excitation light source that outputs the excitation light to a multimode fiber; and a spatial multiplexing optical fiber that is connected to the multimode fiber, that introduces the excitation light into the excitation light coupler, and that has two or more spatial channels.

The present invention relates to the field of optical imaging technology, and in particular to a multimode optical fiber imaging method, system and device based on deep learning. The method comprises: loading a hologram selected after mask processing into an optical modulator so that the light beam output by the multimode optical fiber realizes mask scanning imaging, and the hologram is a hologram used to realize phase modulation of the optical modulator; collecting an image obtained by mask scanning imaging, and restoring the image based on a pre-trained deep learning network model. In the present invention, the optical modulator is modulated by the hologram selected after mask processing, so that when the light beam modulated by the optical modulator passes through the multimode optical fiber to image the sample to be tested, mask scanning imaging can be realized, that is, the imaging speed is improved and the light flux is reduced by reducing the number of sampling points. At the same time, a deep learning network model is further used for restoration, which provides a data basis for the subsequent accurate analysis of the sample to be tested.

This invention discloses an energy homogenization control system for multimode fiber laser lenses, relating to the field of high-power multimode fiber laser technology. The invention achieves online monitoring of the beam spot behind the lens through a beam sampling unit and an acquisition unit, quantifies the energy distribution uniformity through a uniformity evaluation unit, generates adjustment commands through a control decision unit combining feedforward and feedback strategies, actively regulates the beam energy distribution through a homogenization execution unit, and finally ensures the safe and stable operation of the system through a safety protection unit. This achieves closed-loop homogenization control of the beam energy distribution during multimode fiber laser processing, improving the stability and consistency of processing quality, reducing processing defects caused by beam fluctuations, and enhancing anomaly identification and safety protection capabilities.

The application belongs to the technical field of wavelength measurement, and is especially a high-resolution speckle wavelength measurement device and method. The device comprises a shell, a first optical fiber incident port and a second optical fiber incident port are arranged on the outer wall of the shell, an optical switch, a light splitting coupler, a calibration light source and a test light path are arranged in the shell, and the test light path is composed of a multimode optical fiber, an optical fiber mode enhancement device and a surface array detector. The application enhances the coupling and phase delay between different modes by applying mechanical disturbance to the scattering medium, increases the number of excited modes, and solves the problems that the resolution of the speckle wavelength meter is limited by the light path length of the transmission medium and the insufficient information density of the speckle per unit area. The method can improve the wavelength resolution, and effectively improve the sampling speed of the speckle wavelength meter by reducing the size of the photosensitive camera target surface.

The utility model relates to a kind of optical fiber sensing technology, specifically a kind of high-isolation raman wave division multiplexer for DTS, including first wave division multiplexer, second wave division multiplexer, erbium-doped fiber and 980 / 1550nm fusion taper pumping optical wave division multiplexer;First wave division multiplexer, second wave division multiplexer all include single-fiber collimator and double-fiber collimator, and optical fiber type is multimode OM3 optical fiber;Double-fiber collimator has one optical fiber as same optical fiber, so that there is no fusion point between first wave division multiplexer, second wave division multiplexer;Another optical fiber of the double-fiber collimator of second wave division multiplexer uses erbium-doped fiber, so that there is no fusion point between second wave division multiplexer, erbium-doped fiber;Fusion taper pumping optical wave division multiplexer is completely made using HI 1060 optical fiber fusion taper process, and 980nm and 1550nm wavelength are separated;Erbium-doped fiber other end is fused with fusion taper wave division multiplexer main end;Remaining optical fiber is used for port output / input.

The present application relates to the technical field of perovskite photoelectric devices and flat plate optical waveguide, and particularly relates to a method for monitoring the quality and uniformity of perovskite thin film. The method comprises: providing a device to be measured comprising at least a glass substrate and a perovskite layer; coupling light from a wide-spectrum light source into the glass substrate through a multimode optical fiber to excite a loss mode resonance (LMR) effect; collecting a transmission spectrum after a polarizer through a spectrometer; extracting the peak position, intensity and half-peak width of the LMR characteristic peak. The red shift of the peak position indicates thickness change, the intensity decay and the half-peak width broadening indicate quality decline. Multi-point scanning can evaluate uniformity. The present application does not require vacuum equipment, is non-destructive, fast, low-cost, can be integrated into the production line, and solves the problem that the existing detection method cannot meet the needs of large-scale production.

A sample observation device (1) comprising: a light source (10); an objective lens (13); a multimode optical fiber (15); an optical dispersion element (18) configured to allow angular dispersion of the light transmitted by the objective lens as a function of wavelength; an image sensor (19) configured to form an image of the light dispersed by the optical dispersion element; and a processing unit (30) configured to accumulate the intensity detected on pixels along each isofreference line, so as to obtain a frequency spectrum, taking into account the curved shape of each isofreference line. Figure 6A.