30 results about "Raman amplifiers" patented technology

Embodiments of the present disclosure comprise an optical amplifier system, with the system comprising an erbium-doped fiber amplifier comprising a C band EDFA configured to generate C band light, and an L band EDFA configured to generate L Band light. A Raman amplifier comprising a fiber span may be pumped using a backward pump light.

The application discloses a self-adaptive Raman gain compensation system and method, and relates to the technical field of optical communication, wherein the self-adaptive Raman gain compensation system comprises: an optical fiber link; a Raman optical amplifier used for amplifying an input optical signal transmitted by the optical fiber link; a centralized optical amplifier used for amplifying an optical signal output by the Raman optical amplifier; and a compensation device used for acquiring and comparing partial optical powers of the input optical signal and the optical signal output by the centralized optical amplifier, and controlling the gain of the centralized optical amplifier based on a comparison result. The application can realize self-adaptive gain compensation when the gain of the Raman amplifier is insufficient.

Systems and methods for operating a passive optical network (PON) extender. The methods comprise: receiving, by the PON extender, a first optical signal from a remote node device of a passive optical network via a first optical link; amplifying the first optical signal using a Raman amplifier of the PON extender to obtain a first Raman amplified optical signal; amplifying the first Raman amplified optical signal using a first optical amplifier of the PON extender to obtain an amplified uplink signal (wherein the first optical amplifier is different than the Raman amplifier); and passing the amplified uplink signal to an optical line terminal via a second optical link (wherein the optical line terminal is disposed locally at a hub site along with the PON extender).

A Raman amplifier includes: a Raman amplification optical fiber configured to Raman amplify incoherent light in which relative intensity noise (RIN) is suppressed while transmitting the incoherent light; and a pumping light source configured to supply pumping light to the Raman amplification optical fiber, in which a corner frequency fc [Hz] at which the suppression of the RIN starts in the Raman-amplified incoherent light is estimated by using the following Equation (1): fc=1 / (D·Δλ·L) (1), in which a full width at half maximum of a wavelength spectrum of the incoherent light is Δλ [nm], a length of the Raman amplification optical fiber is L [km], and an absolute value of chromatic dispersion of the Raman amplification optical fiber at a center wavelength of the incoherent light is D [ps / nm / km].

A light source includes a seed light source and a booster amplifier. The seed light source outputs incoherent seed light having a predetermined bandwidth. The booster amplifier serves as a semiconductor optical amplifier that optically amplifies the seed light entered through a first end facet and outputs the amplified light through a second end facet. The booster amplifier has nL being set, which is the product of a refractive index n and a chip length L, so that relative intensity noise (RIN) and ripple are simultaneously suppressed in the amplified light.

A Raman amplifier includes a first light source that outputs a primary pumping light, which propagates in a same direction as a propagation direction of a signal light, to an optical transmission line for Raman amplification, a second light source that outputs a secondary pumping light, which pumps and amplifies the primary pumping light and propagates in the same direction as the propagation direction, to the optical transmission line, and a control unit that controls a gain for the signal light by adjusting power of the secondary pumping light.

Systems and methods include receiving inputs comprising a Raman gain target for a Raman amplifier, fiber parameters, and fiber characteristics, each for an optical span; analyzing the inputs with a deep neural network (DNN) having a plurality of layers; providing a plurality of outputs from the DNN; and utilizing the plurality of outputs for a link budget calculation on the optical span. The Raman amplifier includes a plurality of pumps each at a fixed wavelength.

The invention provides a Raman amplifier reflected light processing method and system based on weak etching optical fibers, and relates to the technical field of passive optical networks. The method comprises the steps that pump light parameters and surface roughness parameters of weak etching optical fibers are obtained, the pump light parameters comprise pump light power, a prediction reflection domain is generated through a Rayleigh back scattering model, and the prediction reflection domain comprises predicted reflection spectrum peak displacement and a diffusion area; constructing a multi-layer spectrum grid module for the prediction reflection domain, generating a spectrum coordinate unit, and mapping the prediction reflection domain into a coordinate unit mark; and based on the coordinate unit marks, performing non-overlapping comparison of the overall size of the reflected light and the marks to generate an overall verification result, and when there is no fitting conflict, outputting a final reflected light intensity distribution. The dynamic suppression of the reflected light induced noise is realized under the condition of not depending on additional hardware components, and the system has the advantages of system flexibility and cost efficiency.

The embodiment of the invention provides a Raman amplifier gain adjustment method which comprises the following steps: adjusting DRA-P pumping configuration according to a first preset adjustment target, and determining a third preset adjustment target of a preset virtual intermediate point position according to amplifier performance parameters of a receiving end and a second preset adjustment target of a receiving end OSNR, and adjusting the transmitting terminal configuration of the transmitting terminal according to a third preset adjustment target, detecting the actual OSNR of the receiving terminal, and when the actual OSNR does not meet a second preset adjustment target, circularly and finely tuning the DRA-P pumping configuration and / or the transmitting terminal configuration until the actual OSNR meets the second preset adjustment target. According to the embodiment of the invention, segmented decoupling is carried out on the C + L system, and the gain of the amplifier is adjusted and optimized according to the sequence of the receiving end, the transmitting end and the whole, so that the problem that in the prior art, the stimulated Raman scattering effect exists between the pumping wavelengths of the Raman amplifier in the C + L system and between the service light of the C wave band and the service light of the L wave band can be solved; and the overall optical signal-to-noise ratio performance of the C + L system is influenced.

This application provides a method and system for ultra-long-distance fiber optic frequency transmission. The method includes: establishing a first objective function, which is used to calculate the first Allan variance of the bidirectional gain unit when adjusting its configuration; establishing a second objective function, which is used to calculate the second Allan variance at both ends of the fiber optic link when adjusting the gain power distribution at both ends of the distributed Raman amplifier; calculating the total Allan variance of the fiber optic link based on the first and second Allan variances; and recording the configuration of the bidirectional gain unit and the gain power values ​​of the distributed Raman amplifier at both ends as a static parameter configuration combination when the total gain power of the bidirectional gain unit and the distributed Raman amplifier is greater than the loss of the fiber optic link and the total Allan variance is minimized. This solves the problems of difficult deployment and limited reliability in long-distance fiber optic transmission.

The invention relates to the technical field of optical fiber communication, and provides a third-order Raman amplification method, system and device. The pumping unit of the third-order Raman amplifier outputs the pumping light, and the signal emission unit outputs the signal light; the signal light passes through the transmission unit and then is combined with the pump light to obtain an output signal; the signal receiving unit collects signal power and OSNR data of the output signal and takes the signal power and the OSNR data as experimental reference data; training a PINN model by using system parameters to obtain an intermediate model; performing forward simulation and / or reverse parameter identification by using the intermediate model to obtain an output result; and comparing the output result with experimental reference data, when an error exceeds a preset threshold value, re-training the PINN model until a new error is less than or equal to the preset threshold value to obtain a target model, and completing forward simulation and / or reverse parameter identification by using the target model and the third-order Raman amplifier. The problems that an existing third-order Raman amplifier uses a traditional modeling method and is low in precision and poor in efficiency are solved.

The application provides a kind of distributed optical fiber sensing system and signal processing method, belong to optical fiber sensing technical field.The distributed optical fiber sensing system light signal generating device, acoustooptic modulator, first erbium-doped fiber amplifier, circulator, first Raman amplifier, erbium-doped fiber, sensing optical fiber, coupler, photoelectric balance detector, signal acquisition device and data processing module.The application is amplified to the light signal that enters sensing optical fiber before light signal enters sensing optical fiber by first erbium-doped fiber amplifier and first Raman amplifier, so as to improve the transmission distance of light signal in sensing optical fiber, then the transmission distance of light signal is further improved by the erbium-doped fiber added in sensing optical fiber, so that sensing optical fiber can produce backscattering light signal carrying vibration signal at a farther distance, and the backscattering light signal intensity map is obtained after the backscattering light signal is processed, so that long-distance signal monitoring is realized.

A device, system, and method for distributed Raman amplification of a multi-core fiber (MCF) is disclosed. The optical amplifier device includes a plurality of single mode optical pumps configured to supply one or more wavelengths to a depolarizer and a mode multiplexer configured to receive the one or more wavelengths from the depolarizer to output at least one combined depolarized optical light comprising the one or more wavelengths. The device also includes a coupler to couple the at least one combined depolarized optical light into MCF. The combined depolarized optical light Raman amplifies an optical signal in the MCF.

The present application relates to the technical field of optical communication, and particularly relates to a fiber splice loss calculation method and device, communication equipment and a storage medium. The fiber splice loss calculation method is applied to an optical communication system, the optical communication system comprises transmission optical fibers and a Raman amplifier connected with each other; the method comprises the following steps: setting a target gain, driving the optical communication system to work according to the target gain, obtaining an initial splice loss, an initial gain and an initial total pump power; continuously monitoring real-time gain and real-time total pump power of the optical communication system, obtaining a splice loss real-time change amount based on the real-time gain, the real-time total pump power, the initial gain and the initial splice loss; and adding the splice loss real-time change amount to the initial splice loss to obtain real-time splice loss. The present application can ensure the stability and reliability of signal light transmission.

The application discloses a real-time monitoring method and a sensing system for a catenary cable state based on distributed optical fiber sensing, and the Mach-Zehnder interference and phi-OTDR fusion type distributed optical fiber sensing system comprises a first light source, a second light source, a Mach-Zehnder interferometer, a phi-OTDR and a data acquisition and processing module; Raman amplifiers are arranged at both ends of the Mach-Zehnder interferometer, so that the sensing distance is prolonged; the optical fiber sensing system extracts the phase-modulated interference light signal and the back Rayleigh scattering light signal corresponding to the fault event when the fault event occurs; then, the extracted back Rayleigh scattering light signal is processed to obtain the intensity change information of the fault event, and the position of the fault event is demodulated; finally, the two-dimensional optical signal is sent into a pre-trained Swin Transformer network model to extract the time domain feature, the frequency domain feature and the spatial domain feature, and the type of the fault event is identified through a classifier.

Embodiments of the present disclosure include an optical amplifier system that includes an erbium-doped fiber amplifier that includes a C-band EDFA configured to generate C-band light, and an L-band EDFA configured to generate L-band light. Raman amplifiers including fiber segments that may be pumped using reverse pump light.

Provided in the embodiments of the present disclosure is a method for adjusting the gain of a Raman amplifier. The method comprises: on the basis of a first preset adjustment target, adjusting a DRA-P pumping configuration (S202); on the basis of an amplifier performance parameter of a receiving end and a second preset adjustment target for the OSNR of the receiving end, determining a third preset adjustment target at a preset virtual midpoint position (S204); on the basis of the third preset adjustment target, adjusting a transmitting end configuration of a transmitting end (S206); and measuring an actual OSNR of the receiving end, and when the actual OSNR does not meet the second preset adjustment target, performing cyclical fine tuning on the DRA-P pumping configuration and / or the transmitting end configuration until the actual OSNR meets the second preset adjustment target (S208).

The application discloses a kind of gain adaptive 400G Raman amplifier control methods supporting remote adjustment, specifically relates to optical fiber communication and optical transmission network operation and maintenance control field, the method is generated target gain curve parameter set by remote control end, acquisition pump telemetry and 400G transmission quality index, stable feedback quantity is formed after sliding window preprocessing, abnormal point elimination replacement and filtering;Actual gain curve is calculated by collecting input / output power spectrum, construct the error vector of inclination error, ripple error and segmented differential error, link drift parameter is estimated on-line and based on step constraint sample updates pump response relationship;Parameter set and error vector are input into meta-learning pump inverse mapping model fine-tuning, output pump power, after upper and lower limit and step / rate constraint optimization, closed-loop regulation is issued;When transmission quality deterioration triggers safety threshold, it is rolled back to safe configuration and frozen update until recovery.

A method for computing a set of optimal amplification parameters for a span of a multi-span optical fiber network. Each span has an associated optical transmission fiber connected to associated amplifiers. The associated amplifiers include a forward Raman amplifier and at least one discrete amplifier. Gain and output power of the at least one discrete amplifier is respectively controlled independently. The method includes the steps of providing an analytical form of the signal power evolution along the corresponding span; computing a linear noise from amplifier noise figures and a non-linear noise generated in the corresponding span based on information about the span and the analytical form of the signal power evolution and using the computed linear noise and non-linear noise to compute the impact on the span performance; and computing a set of optimal amplification parameters for the corresponding span based on the impact on the span performance.

The present invention relates to the technical field of communications, and provides a Raman amplifier gain control method and a Raman optical fiber amplifier. The method comprises: inputting pump light of a corresponding wavelength into an optical fiber, and measuring out-of-band ASE power of the optical fiber in each preset frequency band; determining an actual gain coefficient of each preset frequency band on the basis of the out-of-band ASE power of each preset frequency band; matching the actual gain coefficient of each preset frequency band with a preset Raman gain coefficient of each preset frequency band, using an optical fiber corresponding to an actual gain coefficient having the highest similarity obtained by means of matching as a first optical fiber, and using an adjustment parameter of the first optical fiber to perform gain control of a Raman amplifier. The present invention, by means of deriving a Raman gain coefficient in reverse by using the out-of-band ASE power, can measure the Raman gain coefficient during the working process of the Raman amplifier, resolving the problem of it being difficult for a distributed amplifier to acquire a gain coefficient of optical fiber.

The application relates to the field of optical communication technology and provides an ultra-wideband Raman amplifier capable of eliminating the influence of an OSC signal on gain and a control method. Before the OSC detection optical signal is coupled with the pump optical signals of the n pump lasers, the OSC detection optical signal is also coupled with a first optical splitter, and the detected OSC detection optical signal intensity is transmitted to a control unit through a first detector on the output side of the first optical splitter, so that the control unit adjusts the optical power of one or more pump lasers consistent with or similar to the OSC detection optical signal frequency band among the n pump lasers controlled by the control unit according to the OSC detection optical signal intensity. The application can eliminate the influence of the power of the monitoring channel OSC on the gain control precision, reduce the power of the longest wavelength pump laser itself, reduce power consumption, and improve the gain control precision of the overall system.

The application discloses a long-distance distributed optical fiber performance rapid detection device and method based on distributed amplification and optical chirp chain and relates to the technical field of optical fiber performance detection. The device comprises a BOTDA data acquisition module and a data processing module. The BOTDA data acquisition module comprises a narrow linewidth laser, a fiber coupler, a microwave source, a first electro-optic modulator, a second electro-optic modulator, a tunable filter, a first doped fiber amplifier, a circulator, a wavelength division multiplexer, a Raman amplifier, an arbitrary waveform generator, a third electro-optic modulator, a fiber grating filter, a second doped fiber amplifier, a polarization maintaining controller, a fiber to be detected, a photodetector and a data acquisition card. The data processing module processes the BOTDA data, realizes the detection of the temperature and strain of the fiber to be detected, and extracts corresponding characteristic parameters by using a principal component analysis method. The application can realize rapid distributed optical fiber temperature and strain detection and can be applied to the online monitoring of an OPGW cable of a power system.

To appropriately control a gain of Raman amplification in each of a case where light is transmitted in all wavelength bands and a case where light is transmitted only in a part of wavelength bands among predetermined wavelength bands.SOLUTION: When the signal unit does not receive the optical signal of the first band among the plurality of bands, the control unit 14 controls the excitation light source 111 to output the excitation light having a power smaller than that when the optical signal of the first band is received or to stop the output of the excitation light. The excitation light source 111 is controlled so as to output the excitation light of power smaller than the power of the excitation light outputted when the optical signal of the first band is received, and the excitation light source 112 is controlled so as to output the excitation light of power larger than the power of the excitation light outputted when the optical signal of the first band is received.SELECTED DRAWING: Figure 2

The invention belongs to the technical field of light amplification, and discloses a wide-spectrum intelligent self-adaptive gain flattening light amplification system, which adopts a dual-waveband independent amplification framework, configures a dual-pump Raman amplifier for an O / E waveband, adopts a dynamic doped EYDFA design for a C / L / U waveband, and can seamlessly cover a full-spectrum range of 1260-1675nm in combination with a cross-waveband gain complementation scheme; noise interference is effectively reduced through an inter-band crosstalk active offset technology and a nonlinear correction algorithm, and meanwhile, the short-band signal-to-noise ratio is improved based on a multi-stage closed-loop adjustment mechanism; large-bandwidth and high-stability optical signal amplification support is provided for 5G-A, computing power network, space-air-ground integrated communication and other scenes, and the strict requirement of wide spectrum application for signal quality is met; a multi-dimensional feature extraction module and a short and medium-term layered pre-judgment mechanism are integrated, the features such as a full-band power spectrum, the number of wavelengths and the link loss change rate can be collected in real time, and dynamic changes such as signal peak burst and wavelength increase and decrease can be sensed in advance.

A Raman amplification system includes a backward-pumped Raman amplifier provided on an output side of a transmission line and a forward-pumped Raman amplifier provided on an input side of the transmission line, and amplifies a plurality of signal bands by using the backward-pumped Raman amplifier and the forward-pumped Raman amplifier. The backward-pumped Raman amplifier includes a power detector that detects power of at least a part of a signal band on a longest wavelength side among a plurality of signal bands. The forward-pumped Raman amplifier includes a second pumping light source that outputs second pumping light of a specific wavelength for amplifying a second signal band from a shorter wavelength side with highest efficiency among the plurality of signal bands and a second controller that controls the power of the second pumping light source based on a result obtained from the power detector.

This invention discloses a method for optimizing the gain of an O-band Raman amplifier based on a tree species optimization algorithm, comprising the following steps: randomly selecting several sets of pump parameters as initial tree species; calculating the Raman amplifier gain value of the initial tree species, using it as the fitness value of the optimization algorithm, and adjusting the gain of the initial tree species to obtain a dominant tree species; randomly generating multiple sets of first and second tree species near the dominant tree species, and merging the first and second tree species as second-generation tree species; calculating the second-generation fitness value of the second-generation tree species, and performing several iterations of optimization on the second-generation fitness value according to the above steps to obtain the optimal fitness value; and outputting the corresponding optimal tree species based on the optimal fitness value. This invention solves the multi-objective optimization problem regarding pump parameters and effectively improves the transmission distance of O-band signals.

The present invention connects a long-distance transmission section 33 by optical fiber cables 34 which include an active line 34a and an auxiliary line 34b, and improves the efficiency of work when a commissioning test of an optical communication system, including an activation check of a Raman amplifier 14 in each optical transmission device, is performed for two systems of the active line and the auxiliary line. Optical switch devices 20A, 20B are connected to respective optical transmission devices 10A, 10B. The optical switch devices 20A, 20B each include an optical switch unit 21, a remote control unit 22, a state recognition unit 23, and an opposing switch control unit 24. The optical switch unit 21 switches a route between the active line and the auxiliary line. The remote control unit 22 enable external remote control. The state recognition unit 23 acquires information which indicates a state of the Raman amplifier from the optical transmission device. The opposing switch control unit 24 has the function of remotely operating the function of another optical transmission device 10B that is located at an opposing position. The active line / auxiliary line and an optical transmission path of a connection line 35 are used to perform communication for control. The present invention makes it possible for a manager or a worker to perform work by remote operation without moving to a site.

This application provides a high-power Raman amplifier over-excitation damage monitoring and protection system and method, relating to the field of optoelectronic devices; the method includes: acquiring a first parameter sequence characterizing the pump light state and a second parameter sequence characterizing the backscattered light state; calculating a first characteristic value characterizing the spectral uniformity of the pump light based on the first parameter sequence; calculating a second characteristic value characterizing the time-domain statistical properties related to random interference of end-face reflection based on the second parameter sequence; weighting and combining the first and second characteristic values ​​to generate a real-time risk index; and selecting and executing graded protection actions according to the risk index; this application can comprehensively evaluate damage precursors from multiple physical sources, achieving early and accurate prediction and dynamic intelligent protection of damage risks, avoiding the limitations of traditional single-parameter hard threshold judgment, and significantly improving the amplifier's operational reliability and system availability.

The application provides an OPGW optical cable lightning stroke monitoring system based on a dynamic BOTDR, which comprises a laser, a polarization maintaining fiber coupler, a first electro-optic modulator, a first doped fiber amplifier, a first circulator, a wavelength division multiplexer, a Raman amplifier, a to-be-measured optical fiber, an arbitrary waveform generator, a second electro-optic modulator, a second circulator, an optical filter, a cross-polarization crystal, an electric pulse generator, a second doped fiber amplifier, a second coupler, a balanced detector, a filtering and detecting module and a data acquisition card. The application can more accurately capture the temperature change of the optical cable when the optical cable is struck by lightning, monitor the temperature transient response of the optical cable during the lightning stroke process, and further accurately monitor the lightning stroke event of the OPGW optical cable and perform lightning fault positioning by using the technology based on optical frequency scanning to replace the traditional sweep frequency technology to obtain the Brillouin spectrum.

To provide a light source, a light source device, a light source driving method, a Raman amplifier, and a Raman amplification system using the same, in which RIN and ripple are suppressed at the same time.SOLUTION: A light source includes a seed light source that outputs incoherent seed light having a predetermined band, and a booster amplifier which is a semiconductor optical amplifier that optically amplifies the seed light input from the first facet and outputs the amplified light from the second facet, and in the booster amplifier, nL which is the product of the refractive index n and the tip length L is set such that the relative intensity noise (RIN) and ripple are simultaneously suppressed in the amplified light.SELECTED DRAWING: Figure 1