21 results about "Raman pump" patented technology

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.

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.

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.

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 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.

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.

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 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.

Disclosed herein are methods and systems for automatically configuring a raman amplifier. One exemplary system may be provided with the raman amplifier, a user device, and a network administration device. A processor of the network administration device executes instructions that cause the network administration device to generate a machine learning model using machine learning techniques and deploy the machine learning model to a controller of the raman amplifier. When a desired gain profile is communicated from the user device to the controller of the raman amplifier, instructions stored in non-transitory computer readable memory cause a processor of the controller to automatically assess the desired gain profile using the machine learning model to determine raman pump configurations for each of a plurality of raman pumps of the raman amplifier and send the determined raman pump configurations to each of the plurality of raman pumps of the raman amplifier.

A method for tuning a distributed acoustic sensing (DAS) system. The method may include determining a signal strength from a first Raman Pump in the DAS system, sweeping a laser pulse output from a transmitter; wherein the sweeping is an incremental increase of a power of the laser pulse output from a minimum pulse power to a maximum pulse power, and measuring a first signal-to-noise-ratio (SNR) for each of the incremental increase of the power of the laser pulse output. The method may further comprise selecting a maximum SNR from the first SNR for each of the incremental increase of the power of the laser pulse output and configuring the first Raman Pump and the laser pulse output based at least in part on the maximum SNR.