74 results about "Pump wave" patented technology

A laser device comprises a non-collinear optical parametric generator (OPG) and a pump wave source (4). The OFG comprises a non-linear crystal (1) fixedly mounted within the generator wherein the relative orientations of the pump wave (3) and each generated wave (5) to an optic axis (2) of the non-linear crystal (1) are substantially such that a point of inflexion is produced in a tuning curve of wavelength versus pump wave orientation of one of the generated waves, such that a broadband spectral output is obtained. This device has many applications including an amplifier for an input seed wave in which the crystal dose not have to be rotated to match the wavelength of the seed wave; or as part of a continuously tuneable narrowband source.

A method of and device for generating an amplified optical signal directly in an optical fiber by way of phase-sensitive amplification based on one or more four-wave mixing (FWM) processes. In one embodiment, an input signal and two pump waves are applied to a highly nonlinear fiber (HNLF). The input signal is amplified in the HNLF due to energy transfer from the pump waves to the input signal via a degenerate phase-conjugation (PC) process. In another embodiment, an input signal and first and second pump waves are applied to a first HNLF to generate, via a Bragg scattering (BS) process, an idler signal corresponding to the input signal. The second pump wave is then filtered out and the first pump wave, a third pump wave, and the input and idler signals are applied to a second HNLF, where they interact via a non-degenerate PC process to produce an amplified output signal.

An object of the present invention is to prevent an interruption circuit of an optical amplifier from malfunctioning due to Raman pump wave. A typical mode of the present invention is characterized in that an pump wave elimination filter is inserted before an input-light detector and a reflected-light detector which constitute the optical amplifier. This permits only a signal component to be detected, enabling interruption operation, while eliminating a remaining component of Raman pump wave transmitted from for example a downstream of an optical fiber transmission line. In addition, a judgment threshold value for the interruption operation is changed according to ON/OFF condition of the pump wave. Or the Raman pump wave itself is used for detecting output's open.

An amplifier includes two parts as Raman amplifying part consists of a set of pumping laser array, pumping wave combining device, a section of Raman gain optical fibre, signal/pumping multiplexer and demultiplexer and signal demultiplexer; gain feedback control device consists of signal input-output power measurement and pumping laser controller. As discrete Raman optical fibre amplifier, it can realize C+L waveband 1428-1604 nm dispersion compensation by applying dispersion compensating fibre as Raman gain media and realize gain spectrum smooth and fluctuation control for optical signal waveband by controlling output power of N number of pumping lasers in 14xxnm.

An oscillating device includes an oscillating substrate 11 of a non-linear optical crystal and having an incident face 11c where a pump wave 3 and an idler wave 4 are made incident; a first waveguide 24A provided in the oscillating substrate 11 and between the incident face 11c and an interacting part 20 of the pump wave 3 and idler waves 4; and a second waveguide 24B provided in the oscillating substrate 11 and between the incident face 11c and the interacting part 20. The first waveguide 24A guides the pump wave 3 and the second waveguide 24B guides the idler wave 4.

This invention concerns an acousto-optic imaging method comprising a step which consists in engraving in a dynamic holographic material a complex index array resulting from the interference of the acousto-optic component of the signal wave and a pump wave of frequency equal to the frequency of the acousto-optic component.

A pumping module having a cascaded Raman laser for Raman amplified optical transmission systems. Non-linear parametric phenomena, such as Raman-assisted three-wave mixing, in Raman amplified signals from a cascaded Raman pump are strongly reduced by substantially suppressing from the output spectrum of the Raman pump the emission peaks at wavelengths shorter than that of the desired pumping wave on a specific wavelength λ_n, and within a given spacing from λ_n. The pumping non-zero dispersion fibres have zero dispersion between the wavelength range of the transmission signal and the wavelength range of the pump signal.

A system and method for processing an input signal includes a non-linear material component for receiving the signal. The non-linear material component is selected to mix the input signal with an optical pump wave to output an optical signal. The system also includes a parametric amplifier coupled to the non-linear material to obtain the optical signal and to amplify the optical signal to generate an amplified signal and an amplified idler which is a conjugate image of the amplified signal. The system also includes a frequency converter, to obtain the amplified signal and the amplified idler from the parametric amplifier and to convert the amplified signal and the amplified idler into a first output and a second output. The system also includes a first spectral sampling and processing apparatus to obtain and process the first output.

The invention provides an output adjustment method for sound energy obtained by sound wave interaction in a nonlinear medium. The output adjustment method comprises the following steps of: (a) performing nonlinear interaction on a pump wave with the frequency of w3 and a weak signal wave with the frequency of omega1, and generating a resonance wave with the frequency of omega2; (b) respectively calculating amplitude values B1(x), B2(x) and B3(x) of the three waves at the displacement x after interaction according to the frequencies omega3, omega1 and omega2 of the pump wave, the weak signal wave and the resonance wave; and (c) adjusting the output energy of the three waves according to the change characteristics of the amplitude values B1(x), B2(x) and B3(x) of the pump wave, the weak signal wave and the resonance wave. According to the output adjustment method, the energy of the generated sound wave is changed according to a pulse rule on the basis of a basic theory of interaction of sound waves in optics and hydroacoustics; therefore, the output energy of each wave can be adjusted according to actual requirements.

An optical parametric device, for example an optical parametric generator or amplifier or oscillator, comprising a non-linear material (13) that is operable to generate a signal and an idler wave in response to being stimulated with a pump wave. The non-linear medium is such that the pump and idler waves are substantially collinear and the signal wave is non-collinear.

The invention relates to an optical amplifying structure capable of amplifying at least one light wave S, comprising in a substrate, for each wave to be amplified, an amplifying assembly composed of: a first micro-waveguide (7) capable of receiving the light wave S to be amplified, a second micro-waveguide (9) capable of receiving a pumping wave L, a multiplexing device (11) associated with the first and second micro-waveguides, and capable of providing a coupled light wave composed of the wave S and the wave L, an amplifying device (13) connected to an output of the multiplexing device and capable of amplifying the light wave S by at least partial absorption of the pumping wave L, the amplifying device being capable of providing at one output the amplified light wave S. a third micro-waveguide (15) connected to the output of the amplifying device and capable of carrying the amplified light wave S, and a demultiplexing device (19) associated with the third micro-waveguide and capable of demultiplexing the pumping wave L from the amplified wave S, and of providing on a fourth micro-waveguide (17) an amplified light wave S, purged of the pumping wave. The structure of the invention is applied to all fields necessitating an amplification of a light wave and in particular in the field of optical telecommunications by optical fibres.

A device producing laser pulses of durations smaller than 30 ns, and including along its internal optical axis: a laser resonator of optical length smaller than 2 m including two reflecting ends and incorporating an MPF photonic fiber pumped continuously by at least one pump wave with laser diodes, the laser medium being a medium where the laser wave is guided and has a gain with very weak signal greater than 10 per passage, the resonator also incorporating an optical modulator. The optical modulator may deflect the internal laser axis via an electric control along two stable directions, the first direction corresponding to an axis along which the internal laser beam undergoes sufficient losses to prevent the laser effect, the second direction corresponding to an axis along which the laser beam is reflected towards itself at least partially by an optical return element.

The invention relates to a hybrid multiplexing passive optical network and a communication method thereof, which are characterized in that a pumping wave which can be used for four-wave mixing frequency is injected into an optical communication line; after carrying out wavelength division multiplexing (FWM), the pumping wave and a user terminal uplink optical signal are injected into a high non-linear optical fiber or a high non-linear photonic crystal optical fiber; the high non-linear optical fiber or the high non-linear photonic crystal optical fiber realizes the FWM between the pumping wave and the user terminal uplink optical signal and generates a wavelength conversion optical signal; and after passing through a wavelength division multiplexer, the wavelength conversion optical signal is transmitted to an optical line terminal, thereby realizing optical signal uplink communication and supporting the transmission of a plurality of time division multiplexing optical networks in a single optical fiber. The hybrid multiplexing passive optical communication network utilizes the FWM effect in the high non-linear optical fiber and the high non-linear photonic crystal optical fiber, has favorable compatibility with original ONU equipment and the passive characteristics of ODN, can realize the upgrading of the network without changing the ONU equipment and greatly reduce the reforming cost of the network.

This semiconductor laser comprises at least two layers of optically non-linear material as well as a quantum well at least located within one of the layers of optically non-linear material. The thicknesses and optical indices of these two layers are such that the waveguide constituted by these two layers has a modal phase matching condition for the process of parametrical fluorescence between the pump wave emitted by the quantum well and the parametrical conversion waves.

The invention discloses an ultrasonic detection scanning imaging device for an inside coating interface defect of a cylindrical shell and an application method thereof. Two step motors are used for driving a cylindrical shell part to be rotated and driving a ultrasonic transducer to be translated, so the complete imaging of the interface adhesion situation of the inside coating is realized. In the scanning process, the vibration is added to the cylindrical shell part by a low frequency pump wave, the purpose of the added vibration is to open and close tiny cracks of the coating interface continuously, and the nonlinear effect is generated; in addition, the high frequency ultrasonic transducer continuously transmits/receives an ultrasonic signal, the received ultrasonic wave generates the nonlinear ultrasonic phenomenon under the effect of the low frequency pump wave, and the shape and position of the tiny defect of the coating interface are detected by extracting the nonlinear ultrasonic characteristic parameters. The device has the advantages of rapid detection speed, accurate test data, simple device operation and strong practicability, and has the extensive application prospect.

The invention belongs to the field of nonlinear optical research, and in particular relates to a method and a device for generating a transmittable high-power pulse string. The technical problem that the current high-power pulse string with continuous wave background cannot transmit stably is solved. The device for generating the transmittable high-power pulse string comprises the following steps: a, generating a beam of high-power pulse string with continuous wave background; b, separating the beam of high-power pulse string with continuous wave background into at least two beams, wherein the first beam is input into an optical spectrum analyzer, and the second beam is input into an optical adjustable band-strop filter; c, according to the wave length of pump wave, represented by the center frequency of the high-power pulse string with continuous wave background, analyzed by the optical spectrum analyzer, filtering the back ground waves of the center frequency part of the high-power pulse string with continuous wave background to obtain the transmittable high-power pulse string with zero background. The method and the device for generating the transmittable high-power pulse string are simple, convenient and efficient, and have important application value in high-power pulse transmission in optical fiber communication.

A method for producing non-equidistant pump waves for Raman amplification of a signal which is passed via an optical waveguide, as well as a pump wave producing apparatus for producing pump waves for Raman amplification of a signal which is passed via an optical waveguide, which apparatus has at least one pump source and is set up such that it can produce pump waves at a first, a second, a third and a fourth mutually equidistant pump wavelength, having a control device which is set up such that it causes, in each case, the production of a pump wave u, v, w at the first, second and fourth pump wavelengths, with the control device being set up such that no pump wave is produced at the third pump wavelength, so that a non-equidistant pump channel pattern is achieved overall.