42 results about "Fiber optic coupler" patented technology

The invention provides a self-calibration high-strength optical fiber hydrophone based on an end face reflection principle, and relates to the technical field of hydrophones. Comprising the steps that a laser light source emits a first laser beam, and an optical fiber isolator suppresses reflection and outputs a second laser beam. And the optical fiber variable optical attenuator adjusts the incident power and outputs a third laser beam. The 1 * 2 optical fiber coupler splits the laser beam into a fourth laser beam and a fifth laser beam, and the first photoelectric detector monitors power. The optical fiber circulator transmits the fifth laser beam to the optical fiber sensing module, generates reflected light and transmits the reflected light to the second photoelectric detector, and the second photoelectric detector converts the reflected light into a voltage signal. The data acquisition card acquires the signals, the signal demodulation processing unit calculates sound pressure sensitivity according to a mapping relation formula of the voltage signals and sound pressure, and the standard voltage module provides standard voltage for the data acquisition card. The problem that in the prior art, a high-strength hydrophone cannot be repeatedly used and cannot be self-calibrated after being damaged is solved.

The application discloses a kind of spectrometer performance calibration devices for frequency domain OCT system, include: two groups of calibration light path components, light source drive board and fiber coupler;Two groups of calibration light path components are connected to fiber coupler;Fiber coupler is connected to light source drive board;Calibration light path component includes: six-dimensional adjustment frame, installation lens barrel, corner cube, optical flat, two-dimensional adjustment frame, collimating lens and collimating adjustment frame;Corner cube is installed to installation lens barrel;Installation lens barrel is connected to six-dimensional adjustment frame;Optical flat is installed to two-dimensional adjustment frame;Collimating lens is installed to collimating adjustment frame;Collimating adjustment frame is equipped with fiber connection part;Two-dimensional adjustment frame is between installation lens barrel and collimating adjustment frame.This application's spectrometer performance calibration device for frequency domain OCT system, simple structure can obtain signal-to-noise ratio with depth variation curve and other performance indicators, judge spectrometer assembly and debugging result, improve instrument consistency.

The invention provides optical fiber optical tweezer fluorescence lifetime detection equipment and a detection method. A light beam emitted by a light source is divided into two paths, two paths of received optical signals are coupled by using a first optical fiber coupler, and the coupled optical signals are transmitted to a connected optical fiber circulator and are transmitted to a displacement control assembly through the optical fiber circulator. The displacement control assembly captures target tiny particles by using one path of light signals, excites the target tiny particles by using the light signals corresponding to the other path of light beams to generate excitation fluorescence signals, and performs photon number detection on the excitation fluorescence signals by using the detection assembly to determine the fluorescence lifetime of the target tiny particles. According to the method, the fluorescence lifetime of the tiny particles can be detected while the tiny particles are flexibly controlled, and the method is simpler, more convenient and more efficient, and is suitable for ultrafast signal detection of a precise large instrument.

The utility model provides an infrared optical fiber coupling accessory ATR optical fiber spectrum probe data exchangeable device which comprises an optical fiber coupler IC card annular card reader unit and an ATR optical fiber spectrum probe, the optical fiber coupler IC card annular card reader unit is provided with a card reading chip and a processor which are in signal connection, and the ATR optical fiber spectrum probe comprises an ATR probe. The ATR probe is respectively connected to the light outlet knob handle and the light inlet screwing handle through the optical fiber main body, the IC card is embedded in the light outlet knob handle, the processor reads information of the IC card through the card reading chip and uploads the information to the stone spectrometer host through the power supply and communication connecting line, and the stone spectrometer host judges whether the ATR probe meets the requirement or not according to data. The data exchangeable device for the ATR optical fiber spectrum probe of the infrared optical fiber coupling accessory solves the problem of matching attribution interactive verification of the ATR optical fiber spectrum probe of the optical fiber coupling accessory and an infrared spectrometer.

The application relates to a fiber-optic gyroscope Y waveguide nonlinearity index measuring device, which comprises a light source, a fiber coupler, a measured Y waveguide, a fiber ring, a photoelectric detector, a measurement algorithm operator, a high-linearity voltage signal amplifier, a data collector and an upper computer; wherein the light source, the fiber coupler, the Y waveguide and the fiber ring are sequentially connected; the photoelectric detector is connected with the fiber coupler and the measurement algorithm operator; the high-linearity voltage signal amplifier is connected with the Y waveguide and the measurement algorithm operator respectively; the measurement algorithm operator is connected with the data collector; and the data collector is connected with the upper computer. The application can solve the problems that the Y waveguide nonlinearity index of the fiber-optic gyroscope is difficult to measure and cannot be quantitatively tested, and can effectively evaluate the quantitative relationship between the Y waveguide nonlinearity index and the threshold and scale factor nonlinearity indexes of the gyroscope.

The present application relates to a kind of liquid leakage judgment and leakage location positioning system and method, including the broadband light source, spectrum analysis module and fiber coupler respectively connected on optical fiber circulator, fiber coupler is connected multiple groups of liquid leakage monitoring sensor respectively;Liquid leakage monitoring sensor includes at least two groups of fiber collimator arranged horizontally on the same axis, wherein a group of fiber collimator is connected fiber grating, and float is arranged in the direction perpendicular to the axis of two groups of fiber collimator;Broadband light source generates optical signal, and optical signal is sent to fiber collimator by fiber coupler, and the reflection signal generated by fiber grating is acquired by spectrum analysis module;The bottom of float has opening, and the liquid leakage enters the inside of float by opening and pushes it to rise, and the light path between two fiber collimators is shielded, and reflection signal disappears in spectrum analysis module, and the position of liquid leakage monitoring sensor corresponding to disappeared signal is positioned leakage position.

The application relates to the technical field of electro-optical frequency comb generation, and discloses a super-narrow-line-width, wide-band, flexible-repetition-frequency and adjustable electro-optical comb generation system and method, which comprises a pump laser generation branch, a fiber ring cavity, and a frequency shift injection locking branch.The pump laser generation branch comprises a distributed feedback laser, a first polarization controller and a first circulator; the fiber ring cavity comprises a second circulator, a Brillouin gain fiber, a fiber delay line, a fiber coupler, a second polarization controller, an electro-optical modulator, a dispersion compensation fiber, an optical amplifier, a flat filter and an isolator; and the frequency shift injection locking branch comprises a narrow-bandwidth filter, a polarization controller and a frequency shifter.The electro-optical frequency comb generation device of the application has a novel structure, realizes super-narrow-line-width, wide-band, flexible-repetition-frequency and adjustable electro-optical comb output, solves the limitations of narrow bandwidth and wide comb line width of a traditional electro-optical frequency comb generated based on electro-optical modulation, and does not need complex active optoelectronic feedback to maintain stable operation of the system.

The application relates to the field of power electronic devices, in particular to a full-fiber isolation SiC MOSFET gate driver suitable for super-high voltage and application, which comprises a transmitting side, a fiber group and a receiving side connected in sequence, the transmitting side comprises a constant-current laser driver, a semiconductor fiber-coupled laser, a fiber coupler of an FC joint, a high-speed optical transmitter driver and an optical transmitter, the fiber group comprises quartz power optical fibers and plastic signal optical fibers of the FC joint, and the receiving side comprises a beam expander, a laser cell, a 5V voltage-lifting IC, a 25V voltage-lifting IC, an optical receiver, a non-isolated driving IC and a push-pull current expansion circuit; the application adopts power optical fibers and signal optical fibers to transmit power and signals, has the great advantage that the isolation voltage is theoretically infinitely high, and common-mode interference caused by coupling capacitance is eliminated; meanwhile, the device efficiency is reasonably calculated, high-efficiency voltage-lifting ICs are matched, 0.8W driving power is realized, and the driving power is sufficient to drive a 6.5kV 25A high-voltage SiC MOSFET module to work at a switching frequency of 100kHz or above.

The invention discloses a double-sideband FSI optical fiber measurement system and a double-sideband FSI optical fiber measurement method based on temperature drift self-reference correction, which are used for correcting optical fiber short-time amplification measurement error and long-time optical path drift fluctuation caused by temperature drift. Comprising the following steps: 1) generating a double-sideband sweep frequency optical signal through an MZM; 2) establishing wavelength division multiplexing optical paths of the measurement interferometer and the self-reference interferometer; 3) performing frequency mixing interference on the multiplexing measurement light and the reference light, and acquiring an orthogonal interference signal; 4) resolving a corresponding phase difference of the two interferometers based on a time-shifting Ap-FFT algorithm; 5) constructing a double-sideband FSI dynamic measurement formula, and correcting a short-time temperature drift amplification error; 6, a long-time optical fiber optical path-temperature drift model is established, a temperature drift self-correction formula is derived, and long-time optical fiber temperature drift self-correction.According to the long-time optical fiber temperature drift self-correction method, the effect of complex active temperature control is achieved only by adding two optical fiber couplers, measurement limitation caused by temperature control limit is overcome, the optical fiber measurement precision and stability are remarkably improved, and meanwhile cost expenditure is reduced.

A Fabry-Perot sensor cavity length demodulation system and a Fabry-Perot sensor cavity length demodulation method. The demodulation system comprises: a first light source (1) emitting light of a first wavelength; a second light source (2) emitting light of a second wavelength; a wavelength division multiplexer (3) receiving light from the first light source (1) and light from the second light source (2); a fiber coupler (4) receiving and coupling light of the first light source (1) and light of the second light source (2); a Fabry-Perot sensor (5) receiving coupled light from the fiber coupler (4) such that the coupled light is reflected at a first plane and a second plane of the Fabry-Perot sensor (5) to interfere and return the interference light to the fiber coupler (4); a demultiplexer (6) receiving the interference light and separating the interference light into a first light beam (L1) and a second light beam (L2); a first detector (7) and a second detector (8) respectively receiving the first light beam (L1) and the second light beam (L2) and transmitting a first interference signal of the first light beam (L1) and a second interference signal of the second light beam (L2) to a processor (9), the processor (9) being configured to obtain and analyze a first curve (S1) of the first interference signal and a second curve (S2) of the second interference signal to determine an inflection point of a physical quantity to be measured causing a cavity length change in the first curve (S1) and / or the second curve (S2), the first curve (S1) being a curve of light intensity of the first interference signal with respect to the cavity length, and the second curve (S2) being a curve of light intensity of the second interference signal with respect to the cavity length.

Systems disclosed herein are directed to optical terminals configured for free space communication comprising at least one lens collector assembly comprising a lens and a dual clad fiber optic coupler attached to the at least one lens, and a transceiver operably connected to the at least one lens collector assembly.

This invention discloses a small, high-precision fiber optic angular acceleration measurement device. The light source module is connected to a fiber optic circulator via a polarizer, and the fiber optic circulator is connected to an optical modulator via a fiber optic coupler. The optical modulator is connected to a polarization-maintaining fiber optic ring, used to split the linearly polarized light into two counter-propagating beams that enter the polarization-maintaining fiber optic ring, and to receive the interference signal returned from the polarization-maintaining fiber optic ring and input it into the fiber optic coupler. The fiber optic coupler splits the interference signal into two outputs: one path enters a first photodetector via the fiber optic circulator, and the other path enters a second photodetector. The first photodetector converts the received optical signal into an electrical signal and inputs it into a first digital signal acquisition processor. The second photodetector converts the received optical signal into an electrical signal and inputs it into a second digital signal acquisition processor. The first and second digital signal acquisition processors respectively acquire and process the input signals and input them into a data processing unit to calculate the angular acceleration value.

This invention discloses a miniature beam-splitting optical path system for atomic interferometry, comprising a main optical path and primary and secondary reflection sub-paths. Laser light is input into the main optical path after purification and polarization, and then split by a half-wave plate and a polarizing beam-splitting prism. The split beam consists of a primary reflection and a secondary reflection generated by the secondary reflection, which passes sequentially through a quarter-wave plate and a 0° mirror and re-enters the polarizing beam-splitting prism. The primary and secondary reflections then enter their respective sub-paths for further splitting. Independently adjustable right-angle prisms and polarizing beam-splitting prisms within the sub-paths eliminate the influence of the incident direction of the light entering subsequent optical paths. This miniature beam-splitting optical path system and method can output multiple laser beams with consistent polarization, adjustable power and frequency. It can be input and output via fiber optic couplers, and is suitable for atomic interferometry and other fields. It improves the efficiency of laser energy utilization and the stability of laser parameters, easily maintains symmetrical optical path distribution, and enhances system integration.

An OCT online monitoring device for processing transparent and non-transparent composite materials. The present invention relates to the technical field of composite material monitoring, and specifically to the technical field of OCT online monitoring devices for processing transparent and non-transparent composite materials. The present invention first adopts a method of alternately emitting a low-coherence light source and a high-spectral integrated light source to extract the structural information of transparent and non-transparent composite materials, and adopts a dual-path method to simultaneously collect the structural information of transparent and non-transparent composite materials for analysis and processing, thereby improving the comprehensiveness and accuracy of monitoring transparent and non-transparent composite materials. The device comprises: a composite light source, a fiber optic coupler, a reference arm, a sample arm and an imaging processing unit; the fiber optic coupler is respectively connected to the composite light source, the reference arm, the sample arm and the imaging processing unit. The present invention can monitor the microscopic evolution of processing processes such as melting, welding and solidification in real time under non-contact conditions, and provide a high-resolution and dynamic process control basis for composite material molding.

A fiber coupler (135) for coupling a plurality of cores (160) of a multi-core optical fiber (105) to an integrated photonic device comprises a grating array comprising a plurality of polarization splitting gratings (180) arranged in a manner that corresponds to the plurality of cores (160) in the multi-core optical fiber (105). The fiber coupler (135) also comprises first and second mode converters (235, 240) extending from first and second sides of each of the plurality of polarization splitting gratings (180) to receive first and second polarization modes of the optical signal scattered by the polarization splitting grating (180). A plurality of waveguides (145-a, 145-b) extends from ends of each of the mode converters (235, 240) to guide a single polarization mode of one of the optical signals.

This invention discloses an experimental method for measuring the electron-hole recombination emission rate. The apparatus for this method includes a laser chip (with an anti-reflection coating on only one end of its horizontal two-sided end face), a plano-convex lens, a polarizer, a fiber optic coupler, an optical fiber, and a spectrometer. The plano-convex lens, polarizer, plano-convex lens, and fiber optic coupler are placed sequentially on the same horizontal line on both sides of the chip. The fiber optic coupler is connected to the spectrometer via an optical fiber. First, energy is applied to the laser chip, causing it to emit light from both sides. The spectra from both sides are focused onto the fiber optic coupler by the plano-convex lens and then transmitted to the spectrometer via the optical fiber. By rotating the polarizer, different polarization spectra can be selected to obtain specific spectral images under transverse electric / magnetic field modes. Finally, by substituting the spectral data from both ends into the established formula, the electron-hole recombination rate of the laser chip can be calculated.

This invention specifically relates to a refractive index measurement system and method based on fiber optic interferometry, used for real-time monitoring of the refractive index of transparent gases and liquids. It addresses the technical problems of existing air refractive index measurement methods, which either struggle to accurately obtain the absolute value of the refractive index, or involve complex procedures, cumbersome optical path adjustments, susceptibility to vibration interference, and low dynamic response speed. The fiber optic interferometry-based refractive index measurement system includes a tunable fiber laser, a first fiber coupler, a transmitting probe, a receiving probe, an attenuator, a second fiber coupler, a photoelectric converter, and a recording device. The first fiber coupler splits the optical signal emitted from the tunable fiber laser into two paths, one input to the transmitting probe and the other to the attenuator. The input of the second fiber coupler is connected to the output of the attenuator and the output of the receiving probe. This invention offers high reliability and a fast response time of 0.2 ms; it can perform refractive index monitoring in various scenarios.

The application relates to a miniaturized near-infrared spectrometer imaging system, and relates to the field of near-infrared spectrometers, which comprises a light source module, a sample light line generation module, a fiber coupler, a fiber F-P filter, a photodetector and a multimode optical fiber; the light generated by the light source module can irradiate a sample through the sample light line generation module and generate sample light lines; the fiber coupler and the fiber F-P filter are connected through the multimode optical fiber, and the fiber F-P filter and the photodetector are connected through the multimode optical fiber; the fiber coupler receives the sample light fiber and transmits the sample light fiber to the photodetector through the multimode optical fiber, the fiber F-P filter and the multimode optical fiber. The application has the effects of reducing the baseline drift and noise of the spectrum, improving the accuracy of the spectrum, and being smaller in size and lighter in weight.

A fiber optic coupler includes a coupler housing, an inner housing for releasably receiving a fiber optic connector, a release sleeve, and a retainer. The release sleeve is mounted to the inner housing within the coupler housing and is translatable within the coupler housing between a first position and a second position. The retainer is moveably mounted to the inner housing and engaged with the release sleeve, wherein movement of the release sleeve from the first position to the second position causes the retainer to move radially relative to the inner housing from a locking position to an unlocking position to release the fiber optic connector.

The application provides a near-earth optical communication turbulence suppression system and method based on emission source gain regulation, which comprises a host computer and a slave computer, and each comprises a space-fiber coupler, a PSD position detector, a PSD demodulation and control assembly, a communication transmitter-receiver, an electrically-controlled optical attenuator, a stepping actuator and a beacon light emitter; the space-fiber coupler aligns and matches the emitted light with the receiving field of view and couples the space light to the optical fiber; the beacon light emitter emits service beacon light; the PSD position detector performs real-time position detection on the light spot of the service beacon light; the PSD demodulation and control assembly calculates the off-target amount of the light spot position of the service beacon light and its control amount output to the stepping actuator, demodulates the service beacon text data and transmits it to the communication transmitter-receiver; the electrically-controlled optical attenuator regulates the emitted light power of the communication transmitter-receiver; and the communication transmitter-receiver controls the voltage value of the electrically-controlled optical attenuator based on the service beacon text data to realize closed-loop gain control and turbulence suppression from the receiving end to the transmitting end.

This invention discloses a BOTDA fiber optic sensing device and method based on time-overlapping polarization diversity. The device includes a laser, a first fiber coupler, a first polarization controller, an intensity modulator, a microwave source, an optical isolator, a sensing fiber, a second fiber coupler, a first acousto-optic modulator, a second polarization controller, a dual-channel arbitrary waveform generator, a second acousto-optic modulator, a third polarization controller, a polarization combiner, a first erbium-doped fiber amplifier, a first optical circulator, a second erbium-doped fiber amplifier, a fiber Bragg grating, a second optical circulator, a photodetector, a low-pass filter, and a data acquisition and analysis system. This invention employs a time-overlapping polarization diversity method, effectively avoiding polarization noise caused by polarization interference and polarization fading caused by polarization pulling effects, significantly improving the measurement accuracy of the sensor.

The invention discloses a compact broadband frequency modulation optical fiber AOM optical path, which comprises an optical fiber coupler I, a 1 / 2 wave plate and a polarization splitting prism, the 1 / 2 wave plate and the polarization splitting prism are rotatably arranged in front of the optical fiber coupler I in sequence, and an AOM crystal, a rotatably arranged 1 / 4 wave plate, a separation blade and a spherical reflector are sequentially arranged on an optical path separated by the polarization splitting prism. The sphere center of the reflecting surface of the spherical reflector is located in the center of the AOM crystal, and a second optical fiber coupler is arranged on the other light path separated by the polarization splitting prism. According to the optical fiber AOM optical path scheme provided by the invention, a broadband frequency modulation optical fiber AOM optical path is simplified, the optical path is shortened by 1 / 3, miniaturization is further realized, and the optical fiber AOM optical path is more compact, has higher implementability and meets the use requirements of a miniaturized all-optical fiber laser optical path.

The invention provides a film thickness measuring device and method based on high-precision frequency domain broadband light interference. The film thickness measuring device comprises a light source (1), an optical fiber coupler (2), a spectral analysis module, a detection arm and a signal processing module used for signal acquisition. Light emitted by the light source is output by the optical fiber coupler, sequentially passes through the collimating lens (3) and the focusing microscope objective (4) at the detection arm and then is divided into two paths at the spectroscope (6); one path of light is reflected to the silicon wafer (5) of the reference arm by the spectroscope and then is reflected back to the spectroscope; the other path of light is reflected back to the spectroscope after transmitting out of the spectroscope to irradiate a sample (7); the two paths of light converge at the spectroscope and interfere with each other, the generated interference light is returned by the optical fiber and then is collected by the spectral analysis module, and the collected data is transmitted to the signal processing module; according to the invention, the resolution of the optical coherent thickness measurement system can be significantly improved, and the application range and potential of the low-coherence interference thickness measurement system can be effectively expanded.

Some embodiments of the present disclosure are directed to mechanical couplers for fiber array units (FAUs) and methods of manufacturing the same. For example, an optical connector for an optical device may include an FAU and a receptacle positioned on the optical device. The FAU may include a plurality of fiber couplers (e.g., v-grooves, u-grooves, and / or the like) into which optical fibers (e.g., single mode fibers) may be positioned and held in place (e.g., using an adhesive). The FAU may be formed from a substrate, and the fiber couplers may be formed in a surface of the substrate. The FAU may also include substrate mechanical couplers (e.g., additional v-grooves, u-grooves, and / or the like) formed in the surface of the substrate adjacent the fiber couplers and extending substantially parallel to the fiber couplers on the surface of the substrate.

The invention provides a temperature self-compensating optical fiber magnetic field measuring device and method, and relates to the technical field of optical fiber magnetic field sensing, the device comprises a broadband light source, an optical fiber coupler, a sensing head and a spectrum analyzer, the optical fiber coupler is provided with four ports; the broadband light source is connected with a first port of the optical fiber coupler; the spectrum analyzer is connected with a second port of the optical fiber coupler; and two ends of the sensing head are respectively connected with the third port and the fourth port of the optical fiber coupler. The optical fiber magnetic field measuring device is prepared by combining technologies of welding, filling, coating and the like, vernier effect sensitization and temperature self-compensation are realized by regulating and controlling parameters of the sensing head, and ambient temperature crosstalk is eliminated while the magnetic field intensity detection sensitivity of the sensor is improved by one to two orders of magnitude, so that accurate measurement of a magnetic field is realized.

An apparatus, system, and method for providing an optical coupler. The optical coupler can be a micro fiber optic coupler that can include: a housing having a size less than 4 mm x 4 mm; an input end into the housing, the input end capable of receiving a fiber optic transmission line; a transmission line prism within the housing having a size less than 2 mm x 2 mm, the transmission line prism in optical communication with the transmission line; a receiving line prism having a size less than 2 mm x 2 mm, in optical communication with the transmission line prism at a corresponding angle in a range of 30 to 60 degrees, and capable of receiving a signal entering on the transmission line and redirecting the received signal; and a receiving line in optical communication with the receiving line prism and capable of receiving and outputting the redirected received signal.

The application relates to a fluorescence detection device and a crystallization state detection system, the fluorescence detection device comprising a pulsed light signal source, a fiber coupler and a fluorescence detector; the pulsed light signal source comprises at least two signal output ends for outputting pulsed light signals of different frequencies, one of the at least two signal output ends is connected with the fiber coupler through a first optical fiber, and the other signal output ends are connected with the fiber coupler through a delay unit; the delay unit is used for generating a delay between the pulsed light signals of different frequencies; the fluorescence detection device utilizes the delay unit to make the fiber coupler output light signals of different frequencies, i.e. combined wave signals, after coupling, so as to realize detection of different depths of a sample to be detected by utilizing the combined wave signals of different frequencies in time sequence, and improve the detection comprehensiveness.

The invention relates to a sensor as well as a preparation method and a measurement method thereof, in particular to a fiber-optic gyroscope based on a 3 * 3 coupler as well as a preparation method and a measurement method thereof, and aims to solve the problems of lower bandwidth, limited measurement range or higher cost of the conventional fiber-optic gyroscope. The fiber-optic gyroscope comprises a fiber-optic gyroscope table body, a fiber-optic ring fixing cavity arranged on the fiber-optic gyroscope table body, and a combined body of a main fiber-optic ring and a cushion fiber layer ring which are arranged in the fiber-optic ring fixing cavity, the device further comprises an erbium-doped optical fiber light source, a 2 * 2 single-mode optical fiber coupler, an integrated optical modulator, a first photoelectric detector, an optical fiber isolator, a 3 * 3 single-mode optical fiber coupler, a second photoelectric detector and a third photoelectric detector. The method has the advantages that the assembly space of the gyroscope is greatly saved, and meanwhile, the cost of the backup fiber-optic gyroscope is also reduced; and the length and the diameter of the optical fiber ring of the gyroscope for stripe correction can be flexibly adjusted according to actual use requirements.

This invention discloses a high signal-to-noise ratio (SNR) performance enhancement system based on BOTDR, relating to the field of distributed fiber optic sensing technology. It includes an optical path unit and a circuit processing unit. The optical path unit comprises a narrow-linewidth laser (Laser), a pulse modulation module, a variable optical attenuator (VOA), a hierarchical optical amplification module, an optical circulator (OC), a polarization scrambler (PS), and a fiber coupler array. The circuit processing unit includes a photodetector pre-amplifier module, a low-noise amplifier, a frequency mixer and down-conversion module, and a frequency selection module. This BOTDR-based high SNR performance enhancement system significantly improves the system's SNR and monitoring accuracy through optimized optical path and circuit structure design, precise selection of core optical components, and innovative optical signal processing links. Through an integrated design of 1550nm band narrow-linewidth continuous optical modulation, hierarchical precise amplification, polarization state optimization, and efficient coherent beat frequency, noise in the Brillouin scattering signal is effectively suppressed during transmission and detection, resulting in a significant improvement in signal strength.

Dental instrument assemblies (e.g., mouth pieces, bite blocks, vacuum dental mirrors, illuminated dental mirrors, illuminated dental wedges, trans-illumination dental instrument, illuminated dental bite blocks, etc.) are provided. The dental instrument assemblies may be adapted to be periodically sterilized. The dental instrument assemblies may include a magnetically energetic fiber optic coupler. The magnetically energetic fiber optic coupler may be configured to allow dental instrument adapter to rotate with respect to an associated fiber optic cable that is removably connected to the magnetically energetic fiber optic coupler. The dental instrument assemblies may include a fiber optic material that is encapsulated.