32 results about "Raman pump" patented technology

The present disclosure provides computer-implemented methods, systems, and devices for non-invasively measuring a level of an analyte in a user using Stimulated Raman Scattering. A device can include a Raman pump source that, when engaged, emits pump light toward a skin surface of the user at a pump wavelength. The device can further include a Stokes source that, when engaged, emits Stokes light toward the skin surface at one or more Stokes wavelengths. The device can further include a photodetector that measures light that emanates from the skin surface. The device can further include control circuitry configured to pulse modulate the Raman pump source and the Stokes source in accordance with at least one duty cycle. The device can further include a processor that processes the measured light to provide an estimated analyte level of the analyte in the user.

A method may include generating training data corresponding to operation of a Raman pump system. The training data may include input parameters specifying Raman pump parameters and channel launch powers corresponding to respective transmission band channels and an output parameter specifying a Raman pump gain profile of the transmission band channels of the Raman pump system. The method may include training a neural network to output inferred input parameters for the Raman pump system given a specified Raman pump gain profile. The neural network may include an auto-encoder having an input layer with input nodes representing the Raman pump gain profile and the channel launch powers, one or more intermediate layers with intermediate nodes representing the Raman pump parameters and the channel launch powers, and an output layer with output nodes representing the Raman pump gain profile and the channel launch powers.

An optical transmission apparatus that performs Raman amplification on WDM light in a transmission line using Raman pumping light, the optical transmission apparatus includes a controller configured to at a time of activation, measure a first reflected light level that is reflected and input from the transmission line when only optical supervisory channel (OSC) light is transmitted to the transmission line, measure a second reflected light level that is reflected and input from the transmission line when the WDM light, the Raman pumping light, and the OSC light are transmitted to the transmission line, calculate a correction value based on the first reflected light level and the second reflected light level, and during operation of the optical transmission apparatus, monitor the input reflected light level and perform auto power shut down (APSD) control based on a reflected light level corrected by the correction value.

This invention discloses a multi-wavelength Brillouin and Raman random fiber laser based on tunable broadband Raman pumping, comprising a 1.5μm Brillouin pump, a 1.45μm tunable broadband Raman pump, a wavelength division multiplexer (WDM) I, and a passive fiber. The 1.45μm tunable broadband Raman pump includes a wavelength-tunable cascaded random Raman fiber laser, a WDM II, and a single-mode fiber I. The wavelength-tunable cascaded random Raman fiber laser is injected into the single-mode fiber I through the WDM II. This multi-wavelength Brillouin and Raman random fiber laser based on tunable broadband Raman pumping provides a 1.45μm tunable broadband Raman pump source by back-Raman amplification of the broadband seed light. Working together with the 1.5μm Brillouin pump, it can achieve ultra-wideband multi-wavelength random fiber laser output. By simultaneously tuning the output wavelengths of the Brillouin pump and the Raman pump, wavelength tuning of the broadband multi-wavelength random fiber laser can be achieved.

Disclosed herein are fiber-based Raman amplifier systems and methods of generating broadband pump light using a fiber Bragg grating (FBG) including a plurality of gratings. In the disclosed system and method, each of the plurality of gratings includes a central wavelength ([lambda] C) corresponding to a wavelength of an output from a laser, respectively, where the central wavelengths ([lambda] C) of at least two gratings of the plurality of gratings are different from each other. Further disclosed are systems and methods of using a pump source, where the pump source includes a plurality of the lasers that are optically connected to a plurality of the FBGs, respectively, where at least two of the FBGs have the same FBG design as a plurality of the gratings.

An automated portable Raman microscope combines the simplicity, ruggedness, and selectivity of Raman spectroscopy with the sensitivity of single-particle identification. It includes a visible camera, controllable illumination, and a moving optical head that together acquire images of the sample at different focal planes and under different lighting conditions. An internal processor automatically identifies particles or other targets in these images for Raman analysis, e.g., shifted excitation difference Raman spectroscopy. The moving optical head scans the Raman pump beam across the sample to different targets. A built-in user interface displays the results of the Raman analysis superimposed on visual images of the sample. The Raman microscope's simplicity, reliability, and low maintenance make it easy to use for a wide variety of applications, including analyzing and identifying particles and residues, linking chemical and biometric evidence, and forensics analysis.

A system comprising a fiber optic cable, a first passive optical device, a first wavelength division multiplexer 1300 (WDM), a second WDM 1300, a first Raman pump 1100, a second Raman pump 1500, a sec

A fiber Raman amplifier system that includes a Raman pump module with a first pump laser at a first wavelength and a first power and a second pump laser at a second wavelength and a second power. The second wavelength is less than 10 nanometers different from the first wavelength. A ratio of the first power to the second power is adjusted to establish a Raman gain in a bandwidth.

According to an aspect of an embodiment, an optical amplification method may include identifying a first range of signal wavelengths that correspond to a first optical signal configured to propagate via an optical fiber. The method may further include generating a pumping signal having a range of pumping wavelengths, the range of pumping wavelengths based on a range of dispersion wavelengths, which correspond to the range of pumping wavelengths, not overlapping with the first range of signal wavelengths. The pumping signal may be provided to the optical fiber having the optical signal propagating thereon.

The embodiment of the invention discloses a laser detection and treatment all-in-one machine and a laser output control method. According to one specific embodiment, the laser detection and treatment all-in-one machine comprises Raman detection information acquisition equipment, semiconductor laser output treatment equipment and touch screen processing equipment, the Raman detection information acquisition equipment comprises Raman exciting light output equipment, an exciting light transmission optical fiber, a collimating mirror, a Raman pump light narrow-band pass filter, a replaceable focusing mirror, a reflecting mirror, a Raman signal light transmission optical fiber, a first replaceable double-color piece, a second replaceable double-color piece, a third replaceable double-color piece and a first charge-coupled device camera; the system comprises a first charge-coupled device camera, a second charge-coupled device camera, a third charge-coupled device camera, an upper computer connecting line and an analog-to-digital converter. The Raman detection information acquisition equipment is used for acquiring Raman spectrum data of the to-be-detected object; the touch screen processing device is configured to perform tissue anomaly detection and laser output steps. According to the embodiment, the laser treatment effect is improved, and the operation treatment time is shortened.

A system for downhole measurements. The system may comprise a fiber optic cable that further comprises a transmission fiber and a return fiber. Additionally, the system may comprise a passive optical device optically connected to the transmission fiber and the return fiber, a first wavelength division multiplexer (WDM) optically connected to the transmission fiber, and a second WDM optically connected to the return fiber. The system may further comprise a transmitter and a first Raman pump optically connected to the first WDM and a receiver and a second Raman pump optically connected to the second WDM.

The present disclosure provides a tunable broadband random optoelectronic oscillator, including: a laser light source configured to generate continuous laser light; a positive feedback loop formed by an intensity modulator, an optical circulator, an optical filter, an optical amplifier, a photodetector, an electric filter and an electric amplifier connected in sequence, wherein the positive feedback loop is configured to receive the continuous laser light to generate a microwave signal and achieve an optic-electro / electro-optic conversion; a Raman laser configured to generate Raman pump light; a wavelength division multiplexer having a first input terminal connected to the Raman laser and a second input terminal connected to the optical circulator; and a dispersion compensation fiber connected to an output terminal of the wavelength division multiplexer; wherein forward transmission laser light passing through the optical circulator and the Raman pump light are coupled into the dispersion compensation fiber through the wavelength division multiplexer.

An optical amplifier, a related method, and a device. The optical amplifier provided in embodiments includes a lumped gain medium, configured to: amplify an input optical signal of the optical amplifier to obtain a target optical signal, and output the target optical signal to a first multiplexer / demultiplexer; a first Raman pump unit, configured to: emit first Raman pump light, and output the first Raman pump light to the first multiplexer / demultiplexer, where the first Raman pump light is used to amplify the target optical signal; and the first multiplexer / demultiplexer, configured to couple the target optical signal and the first Raman pump light, to obtain output light of the optical amplifier.

A compact, portable Raman spectrometer makes fast, sensitive standoff measurements at little to no risk of eye injury or igniting the materials being probed. This spectrometer uses differential Raman spectroscopy and ambient light measurements to measure point-and-shoot Raman signatures of dark or highly fluorescent materials at distances of 1 cm to 10 m or more. It scans the Raman pump beam(s) across the sample to reduce the risk of unduly heating or igniting the sample. Beam scanning also transforms the spectrometer into an instrument with a lower effective safety classification, reducing the risk of eye injury. The spectrometer's long standoff range automatic focusing make it easier to identify chemicals through clear and translucent obstacles, such as flow tubes, windows, and containers. And the spectrometer's components are light and small enough to be packaged in a handheld housing or housing suitable for a small robot to carry.

The invention relates to a method for designing a high-gain flat broadband erbium-doped fiber and Raman hybrid amplifier based on a neural network. The method comprises the following steps: setting a target total gain of the hybrid amplifier; selecting the pumping power of the erbium-doped optical fiber amplifier; subtracting the gain of the erbium-doped optical fiber amplifier from the target total gain to obtain the gain of the Raman amplifier; and determining a Raman pumping parameter value according to the gain of the Raman amplifier by using a neural network. According to the invention, Raman pumping parameter values are rapidly determined by using the neural network, and it is ensured that the hybrid amplifier provides a high-accuracy broadband flat gain spectrum.

The invention discloses a method for increasing a power optical fiber multi-parameter monitoring distance based on pumping optimization, and relates to the technical field of optical fiber sensing, a power optical fiber long-distance multi-parameter monitoring system is deployed, continuous light emitted by a laser is divided into two paths of branch laser, and one path is modulated into pulse light with a suitable pulse width for sensing; in a pulse light transmission path, a scrambler is added to suppress phase and polarization coherent noise, and pulse light is separated into optimal sensing wavelengths matched with different measurement parameters by using a wavelength division multiplexing technology. According to the invention, the wavelength division multiplexing technology is utilized to enable the single-mode fiber to realize simultaneous monitoring of a plurality of physical quantities, the optimal Raman pump light and amplification technology are selected to realize long-distance monitoring in the power transmission line, the problem that a single parameter is difficult to truly reflect the state of the power transmission line is solved, the existing fiber in the OPGW can be directly used, special customization is not needed, and the cost is reduced. The method is suitable for long-distance power transmission lines, and potential problems existing in optical cable operation can be found and eliminated in time.

Systems and methods for measuring Raman gain in an optical span include, subsequent to determining a baseline measurement of a first total-power output at an upstream node and a first total-power input at a downstream node, causing a measurement a second total-power output at the upstream node and a second total-power input at the downstream node with one or more Raman pump lasers on; and determining a Raman gain for the optical span by comparing (a) a difference between the first total-power output and the first total-power input to (b) a difference between the second total-power output and the second total-power input. The baseline measurement was determined when one or more Raman pump lasers associated with the optical span were turned off. The Raman gain reflects an effective gain achieved over all of the optical span rather than only at a local amplifier input.

The invention discloses a tunable Raman fiber laser, comprising: a Raman laser pump source, which is used to generate laser with tunable pulse width, repetition frequency and wavelength, wherein the tunability of the pulse width and repetition frequency is realized based on the gain modulation principle, and the tunability of the wavelength is realized through a tunable filter; a Raman fiber optically coupled to the Raman pump source, which is used to provide Raman gain and transfer the laser wavelength generated by the pump source to the Raman wavelength; since the pulse width, repetition frequency and wavelength of the Raman laser pump source are tunable, the Raman laser can also be tuned, thereby obtaining a laser output with tunable pulse width, repetition frequency and wavelength based on the Raman effect.

The invention discloses a single-photon Raman temperature sensing system and a sensing method thereof, solves the problem of photon counting curve jittering caused by Raman gain in an optical fiber and polarization sensitivity of a single-photon detector, and belongs to the technical field of distributed optical fiber sensing and single-photon detection. According to the distributed optical fiber temperature sensing system and method based on the dual-wavelength cross-polarization pulse pumping, Raman pumping and single photon detection are carried out by combining a dual-independent-wavelength pulse light source with a cross-polarization synthesis light path; and photon number jitter of the Raman gain and the single-photon detector in the optical fiber due to the change of the polarization state of the optical signal can be effectively solved. According to the invention, the problem that the temperature measurement curve in the traditional single-photon Raman temperature sensing system changes periodically is eliminated, and the temperature measurement accuracy and the temperature resolution are higher, so that the method can be conveniently applied to the high-precision single-photon Raman temperature sensing system.

To provide forward Raman pumping with respect to dispersion shift fibers.SOLUTION: According to an aspect of an embodiment, an optical amplification method may include identifying a first range of signal wavelengths that correspond to a first optical signal configured to propagate via an optical fiber. The method may further include generating a pumping signal having a range of pumping wavelengths, the range of pumping wavelengths being based on a range of dispersion wavelengths, which correspond to the range of pumping wavelengths, not overlapping with the first range of signal wavelengths. The pumping signal may be provided to the optical fiber having the optical signal propagating thereon.SELECTED DRAWING: Figure 2B

Disclosed herein are fiber-based Raman amplifier systems and methods of producing a broadband pump light utilizing a fiber Bragg grating (FBG) including a plurality of gratings. In disclosed systems and methods, the plurality of gratings each include a center wavelength (λC) corresponding, respectively, to a wavelength of an output from a laser, wherein the center wavelength (λC) of at least two gratings of the plurality of gratings are different from each other. Further disclosed are systems and methods using a pump source, where the pump source includes a plurality of the lasers optically connected, respectively, to a plurality of the FBGs, where at least two of the FBGs have a same FBG design with a plurality of the gratings.

The application relates to a sending-out-sea-cable distributed optical fiber online monitoring device, which generates pump laser through a pump laser module; modulates the pump laser pulse by using an electro-optic modulator; amplifies the pump laser pulse through a first optical fiber amplifier; adjusts the polarization state of the pump laser through a polarization disturbance module; detects the backscattering signal through a photoelectric detector; collects the detected backscattering signal data by using a data acquisition module; measures the light frequency through a microwave frequency meter; controls the temperature and current of the pump laser through a control circuit; blocks the pump laser pulse through a one-way isolator; distributes the pump laser pulse through a Raman pump laser; couples the light signals through a plurality of optical fiber couplers; separates or combines the light signals of different wavelengths through a wavelength division multiplexer; and controls the paths of the pump laser pulse and the detection laser through a first optical switch and a second optical switch.

A fiber optic Raman amplifier system includes a Raman pump module having a first pump laser at a first wavelength and a first power and a second pump laser at a second wavelength and a second power. The difference between the second wavelength and the first wavelength is less than 10 nanometers. A ratio of the first power to the second power is adjusted to establish a Raman gain in a bandwidth.

A system comprising a fiber optic cable, a first passive optical device, a first wavelength division multiplexer 1300 (WDM), a second WDM 1300, a first Raman pump 1100, a second Raman pump 1500, a sec

The invention provides a broadband Raman optical amplifier pumping power optimization method based on a neural network. The method comprises the following steps: constructing a broadband Raman optical amplifier system; utilizing Latin hypercube sampling to generate pumping power data, and obtaining a corresponding gain spectrum through a Raman simulation link to form a data set; a neural network gain prediction model is constructed, and the optimized data set is used for training; based on the trained model, constructing a multi-wavelength Raman pumping power intelligent optimization framework integrated with a plurality of optimization algorithms; the framework outputs optimal pumping power configuration according to application scene parameters input by a user and a selected optimization algorithm. According to the invention, the pump power is quickly mapped and configured to the gain spectrum through the neural network model, and efficient optimal configuration of the pump power of the Raman amplifier is realized by combining various optimization algorithms.

Embodiments of the present disclosure disclose a laser detection and treatment integrated machine and a laser output control method. A specific embodiment of the laser detection and treatment integrated machine comprises a Raman detection information acquisition device, a semiconductor laser output treatment device, and a touch screen processing device. The Raman detection information acquisition device comprises a Raman excitation light output device, an excitation light transmission optical fiber, a collimating mirror, a Raman pump light narrow band filter, a replaceable focusing mirror, a reflecting mirror, a Raman signal light transmission optical fiber, a first replaceable dichroic mirror, a second replaceable dichroic mirror, a third replaceable dichroic mirror, a first charge-coupled device camera, a second charge-coupled device camera, a third charge-coupled device camera, a host computer connection, and an analog-to-digital converter. The Raman detection information acquisition device is configured to acquire Raman spectrum data of a subject to be measured. The touch screen processing device is configured to perform a tissue abnormality detection and laser output step. The embodiment improves the laser treatment effect and reduces the operation treatment time.

Disclosed herein are methods and systems configuring a raman amplifier. One exemplary system may be provided with an optical amplifier deployed in an optical network, the optical amplifier having a plurality of raman pumps configured to obtain a desired gain profile. An actual gain profile and a raman pump configuration of each of the plurality of raman pumps may be processed by a network administration device using a first machine learning model to produce a combined optical transmission segment attribute representing attributes of an optical segment of the optical network. The combined optical transmission segment attribute and the desired gain profile may be processed with a second machine learning model to produce corrected raman pump configurations for each of the plurality of raman pumps of the raman amplifier. The corrected raman pump configurations may be used to configure each of the plurality of raman pumps of the raman amplifier.

The invention provides a terahertz light source based on gas stimulated Raman pumping optical difference frequency, which comprises an Nd: YAG laser, a stimulated Raman gas cell and a nonlinear optical crystal which are sequentially arranged, a first lens is arranged between the Nd: YAG laser and the stimulated Raman gas cell, and a second lens is arranged between the Nd: YAG laser and the stimulated Raman gas cell. A second lens is arranged between the stimulated Raman gas cell and the nonlinear optical crystal; laser emitted by the Nd: YAG laser enters the stimulated Raman gas cell, first laser and second laser are generated through a stimulated Raman process, the wavelength of the first laser is lambda1, the wavelength of the second laser is lambda2, and the first laser and the second laser generate an optical parameter difference frequency effect in the nonlinear optical crystal to generate terahertz light. The terahertz light source is simple in structure, large in output energy and high in stability.

The present disclosure provides methods, systems, and devices for non-invasively measuring a level of an analyte in a user using Stimulated Raman Scattering. A device can comprise a single-mode Raman pump light source that emits pump light toward a tissue of the user at a pump wavelength. The device can comprise a multi-mode Stokes light source that emits Stokes light toward the tissue at one or more Stokes wavelengths. The device can comprise a beam controller that directs the pump light and the stokes light to a location to cause a high intensity area of the light produced by the pump light to overlap one or more high intensity areas of the light produced by the stokes light. The device can comprise a photodetector that measures light that emanates from the tissue. The device can comprise a processor that provides an estimated analyte level of the analyte in the user.

The invention relates to the technical field of optical communication, and provides a Raman transmission system which comprises a first performance convergence unit, a first optical path subunit, a second optical path subunit and a second performance convergence unit. According to the method, the optimal backward Raman pumping power value is determined by reducing the output power of the power amplifier and the pumping power value of the forward Raman amplifier and comparing service performance parameters of a receiving end; and then the output power of the power amplifier and the pumping power of the forward Raman amplifier are respectively adjusted according to a preset rule until the service performance parameters are not degraded any more, and the optimal output power of the power amplifier and the optimal pumping power of the forward Raman amplifier are obtained. According to the embodiment of the invention, by adjusting the power of different amplifiers and simulating different states of transmission lines, the optimal power value of each amplifier is accurately obtained, the optimal transmission performance of the system is determined, the problem that the Raman transmission system engineering is debugged by experience when being opened can be solved, and the opening time of the Raman system is greatly saved.