44 results about "Optical fiber amplifiers" patented technology

The application relates to a method of an electric field sensor based on an optoelectronic oscillator, belonging to the field of optical devices and optical fiber sensing. The device comprises a laser source, a polarization controller, a phase modulator, a fiber Bragg grating with an acrylate glue cavity, a stacked piezoelectric ceramic, an electric field generator, an erbium-doped fiber amplifier, a photodetector, a power divider and an electric amplifier. The stacked piezoelectric ceramic is combined with the fiber Bragg grating with the acrylate glue cavity as a sensing head, the wavelength change of the fiber Bragg grating with the acrylate glue cavity caused by the piezoelectric effect is mapped to the frequency change of the microwave signal generated by the optoelectronic oscillator, and the electric field change value can be obtained by monitoring the microwave signal of the optoelectronic oscillator. In the loop of the optoelectronic oscillator, the electric spectrum analysis technology is used for demodulation, and high-speed and high-resolution electric field measurement can be obtained. The method has the advantages of simple structure, high measurement sensitivity and easy practicability.

The invention provides a coherent optical time domain reflection sensing device and a method thereof, and relates to the technical field of distributed optical fiber acoustic wave detection. The device comprises a light source, a 1 * 2 coupler, a control and signal processing unit, an arbitrary waveform generator, a double-path parallel Mach-Zehnder electro-optical modulator, a reference arm optical fiber, an erbium-doped optical fiber amplifier, an optical filter, a circulator, a sensing optical fiber, a 90-degree optical mixer, a photoelectric detector and a data acquisition card. A detection light sequence containing positive and negative frequency shift light pulse sequences is injected into a sensing optical fiber, returned signal light which carries light phase information of each detection point and has superposed frequencies is mixed with local reference light, signal separation is achieved after the signal light is multiplied by complex factors corresponding to each frequency shift pulse and integration of a periodic integral multiple window is carried out, and the detection point light phase information is obtained. And optical phase information demodulation is carried out, and then fusion of detection results of optical signals of various frequencies is carried out, so that high-sampling-rate sensing of acoustic vibration is realized.

According to the laser detection system for detecting the health condition of the underground comprehensive pipe gallery provided by the invention, the narrow-linewidth high-stable-frequency laser is combined with a balance detection technology, so that the capability of detecting weak ultrasonic signals of a pipe wall is remarkably improved, and environmental common-mode noise is effectively inhibited; the attenuation problem of laser in long-distance transmission is overcome by using an erbium-doped optical fiber amplifier light amplification technology, and continuous health monitoring of a several-kilometer-level pipe gallery is realized; through cooperative work of the 180-degree mixer and the signal acquisition system, high-precision analysis of phase change of reflected light is realized, and the position of a damage or disturbance source can be accurately positioned without contact with a pipe wall; furthermore, through feature analysis of the ultrasonic frequency spectrum, the system can sensitively capture early hidden defects such as internal cracks and corrosion of the pipe gallery structure and threats such as external construction excavation, and reliable data support is provided for health assessment and risk early warning of the pipe gallery structure.

A photonic crystal fiber (10) comprises: a core region (11) having a rare earth element added thereto; and a cladding region (12) including a plurality of refractive index reduction parts (13) provided around the core region (11). Each of the refractive index reduction parts (13) is formed of a glass rod having a refractive index lower than that of the cladding region (11) or a hole. The mode field diameter of the basic mode at a wavelength of 1.55 µm is not less than 16.4 µm.

This invention discloses a high-efficiency nonlinear optical frequency converter based on high-power continuous optical transmission using quartz micro / nano fiber, comprising a wavelength-tunable laser, an optical fiber amplifier, a quartz micro / nano fiber, a sealed cavity, and an optical fiber low-pass filter; the quartz micro / nano fiber includes a first untapered portion, a second untapered portion, a first tapered transition region, a second tapered transition region, and a waist region, transmitting an optical field TE. 01 The mode cutoff method precisely controls the waist diameter of micro / nano fiber and accurately tunes the input light wavelength. The nonlinear light frequency conversion process excited by high-power continuous light transmitted in quartz micro / nano fiber satisfies perfect phase matching. The fundamental mode of the input light and the higher-order mode fields of the harmonic signal light have high overlap in the waveguide mode, which can efficiently generate continuous second and third harmonic signal light. The device has high stability, high efficiency, and low cost, and can be applied in fiber lasers, all-optical signal processing, fiber optic sensing and other fields.

The invention discloses a microwave photon frequency hopping signal generation method based on double optical combs, and relates to the technical field of microwaves and the field of optical communication. The method is shown in a figure 1 in the specification, and comprises a laser, an optical coupler, a signal source, a radio frequency source, a Mach-Zehnder modulator, a double-parallel Mach-Zehnder modulator, an optical band-pass filter, an optical switch, an erbium-doped optical fiber amplifier, a double-parallel Mach-Zehnder modulator, a 90-degree bridge, a photoelectric detector and a transmitting antenna. According to the invention, an electro-optical modulator is utilized to generate an optical frequency comb and modulate a frequency hopping local oscillator signal in an upper path, a double-parallel Mach-Zehnder modulator is utilized to shift frequency in a lower branch, then the electro-optical modulator is utilized to generate the optical frequency comb, the upper path and the lower path are combined, channels where different optical frequency combs are located are separated through an optical filter, different channels are selected through an optical switch, and the frequency hopping local oscillator signal is modulated. And finally, a frequency hopping signal is obtained through a photoelectric detector. According to the invention, large-bandwidth and high-precision frequency hopping signal generation can be realized, and the requirement on an optical filter is reduced.

1. Name of the designed product: optical fiber amplifier. 2. Use of the designed product: power amplification and output of inputted laser of specific wavelength and power range. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.

The invention discloses an optical frequency domain reflection distributed measurement system based on complex beat frequency signal reconstruction and an application method thereof. The system comprises a linear sweep frequency laser, a first optical coupler, an erbium-doped optical fiber amplifier, an optical circulator, an optical waveguide to be measured, a polarization controller, a second optical coupler, a photoelectric detector and a data acquisition and processing module. According to the invention, the reconstruction of the complex beat frequency signal can be realized without introducing a new photoelectric device, the coherent fading and cross interference noise in the low-frequency range of the OFDR can be effectively suppressed, the interference of positive and negative spectrum aliasing noise can be avoided, and the measured signal-to-noise ratio and the measurement precision can be obviously improved without increasing the system hardware complexity.

This application provides a Raman fiber amplifier and an optical communication system, relating to the field of optical communication technology, to address the increased cost caused by the need to develop and use two different Raman fiber amplifiers. The Raman fiber amplifier includes a first port, an optical coupler, a pump laser, a second port, a third port, and a mode control device. The first port and the pump laser are both connected to the optical coupler. The pump laser generates pump light that is transmitted to the optical coupler, which then transmits the pump light to the first port. The second port, the third port, and the optical coupler are all connected to the mode control device. The mode control device controls unidirectional conduction between the optical coupler and the second port in the direction toward the optical coupler, and controls unidirectional conduction between the optical coupler and the third port in the direction toward the third port. This Raman fiber amplifier can be applied to optical communication systems.

The invention provides a system for widening a bismuth-doped optical fiber fluorescence range based on short wave pumping, the system comprises a laser pumping source, a bismuth-doped optical fiber, a spectrometer, a wavelength division multiplexer and an optical isolator, the laser pumping source is 900-1000nm, and a bismuth-doped optical fiber core takes quartz-based glass doped with a bismuth element and one or more elements of phosphorus, germanium and aluminum as a main body. By optimizing optical fiber spectrum excitation conditions, under high-energy short-wavelength pumping, various bismuth active centers are effectively excited, 1000-1800 nm ultra-wideband near-infrared fluorescence output is achieved, and the 6dB bandwidth can reach 150 nm or above. The method has wide application prospects in the fields of ultra-wideband optical fiber amplifiers, wideband tunable lasers, super-continuum spectrum light sources and the like.

The invention discloses a communication and remote sensing integrated forest fire prevention laser radar system and a use method thereof. The laser radar comprises a continuous light laser, a beam splitter, an analog signal generator, an electro-optical modulator, a pulse optical fiber amplifier, a circulator, a variable-focus transceiver telescope, a coupler, an acousto-optic frequency shifter, a balance detector, a receiving telescope, an avalanche diode detector, a multi-channel data acquisition system and a computer. According to the invention, the electro-optical modulator is adopted to modulate a high-frequency pulse signal, and an atmospheric detection signal and a communication signal can be generated; signal frequency shift is realized by adopting an acousto-optic frequency shifter, and wind field direction information is obtained; a variable-focus transceiving telescope, a receiving telescope and laser radars are adopted for networking, and optical information transmission between the laser radars is achieved. The system can realize information communication of the laser radar in a non-signal area, and is especially suitable for being applied to the field of forest fire prevention based on the advantages of multi-parameter detection, high resolution and wide coverage of the laser radar.

The present application provides an optical fiber amplifier, comprising: a gain optical path, configured to amplify signal light; a first filter, configured to filter backward spontaneous emission light generated by the amplification of the signal light by the gain optical path, and retain auxiliary light that meets a preset requirement; and a coupler, configured to combine the auxiliary light with new signal light to be amplified by the gain optical path, so as to enhance population inversion generated when the combined new signal light is amplified by the gain optical path.

This invention provides a large-scale, high-precision optical Ising computer that can significantly increase the number of spins, achieve optimal binary bifurcation for the problem to be solved using an arbitrary nonlinear function, and converge stably and quickly. [Solution] The system includes a pulse light source 1, an optical fiber loop 3 into which optical pulses from the pulse light source 1 are introduced, an erbium-doped optical fiber amplifier 4 provided within the optical fiber loop 3, a homodyne detection circuit 5 for detecting optical pulses from the optical fiber loop 3, a matrix-nonlinear calculation circuit 6 for digitally calculating an interaction function and a nonlinear function for binary branching for the optical pulses detected by the homodyne detection circuit 5, and an AM optical modulator 2 which receives the optical pulses from the pulse light source 1 and the information obtained from the digital calculations of the matrix-nonlinear calculation circuit 6, modulates the input optical pulses, and then injects them into the optical fiber loop 3.

In some implementations, a fiber amplifier system includes a fiber oscillator and a fiber amplifier coupled to an output end of the fiber oscillator. The fiber oscillator may include an active fiber having a first end and a second end, where the active fiber is to receive pump light from one or more optical sources; one or more high-reflectivity mirrors coupled to the first end of the active fiber; and multiple output coupler mirrors coupled to the second end of the active fiber. The one or more high-reflectivity mirrors and the multiple output coupler mirrors may form an optical cavity with the active fiber for generating laser light. The multiple output coupler mirrors may have respective center wavelengths that are different. The multiple output coupler mirrors may have respective reflection spectrums that are different.

An optical amplification fibre is provided with at least one core part to which a rare earth element is added, an inside cladding part that surrounds the core part and that has a refractive index lower than the maximum refractive index of each of the core parts, and an outside cladding part that surrounds the inside cladding part and that has a refractive index lower than the refractive index of the inside cladding part, the inside cladding part having a refractive index difference region in which the refractive index is different to that of the adjacent region.

The application discloses a wavelength-tunable visible light system based on a random fiber laser, which comprises a random fiber laser module, a first isolator, a fiber amplifier module, a second isolator, a dual-wavelength tunable Raman random laser module, a third isolator and a nonlinear frequency conversion module which are sequentially connected. The random fiber laser module is used for outputting tunable wavelength ytterbium-doped random laser. The fiber amplifier module is used for amplifying the optical power of the ytterbium-doped random laser to obtain amplified ytterbium-doped random laser. The dual-wavelength tunable Raman random laser module is used for outputting dual-wavelength tunable Raman random laser. The nonlinear frequency conversion module is used for converting the dual-wavelength tunable Raman random laser into tunable visible light random laser. The application can realize the output of wavelength-tunable visible light random laser, and there is no gap in the whole adjustment range.

The technology of this application relates to the field of communication technologies, and an optical fiber raw material composition, an optical fiber, and an optical fiber product. The optical fiber raw material composition includes components of the following molar percentages: AlF3 10%-50%, BaF2 3%-20%, CaF2 3%-20%, YF3 1%-15%, SrF2 3%-20%, MgF2 3%-20%, and TeO2 1%-35%. The optical fiber prepared by using the optical fiber raw material composition provided in this disclosure can be used in aspects such as a mid-infrared band transmission optical fiber, an optical fiber amplifier, a fiber laser, and an optical fiber sensor.

The invention discloses a high-power tunable mid-infrared electro-optical frequency comb generation system and method, and solves the problems that an existing mid-infrared optical frequency comb system is large in size, high in cost and difficult to realize high-power output due to performance limitation of a pump light source and an integrated device. The mid-infrared optical fiber amplifier which is mature in technology and low in manufacturing cost is adopted to replace a high-performance narrow-linewidth pump light source, meanwhile, the ring cavity structure and the resonance principle are combined, automatic selection of the initial wavelength and controlled generation of the comb tooth sideband are achieved, the mid-infrared optical fiber amplifier plays the dual roles of pump light signal oscillation starting and power cycle amplification, and the frequency of the comb tooth sideband is increased. The problems that in other schemes, an intermediate infrared extremely-narrow linewidth light source is difficult to obtain, pump and resonance synchronous locking is difficult, and a control system is complex are solved, all elements are easier to obtain, a high-frequency electric control loop is not needed, and the advantages of being low in cost and easy to construct are achieved.

The utility model relates to the technical field of optical fiber amplifiers, and discloses a high-precision Chinese dynamic digital display amplifier which comprises a main body shell and an L-shaped frame arranged at the bottom, the inner bottom wall of the main body shell is fixedly connected with a cooling rectangular pipe, the cooling rectangular pipe is of an inverted U-shaped structure, and the two ends of the cooling rectangular pipe are located below the main body shell. According to the high-precision Chinese dynamic digital display amplifier, the cooling rectangular pipe adopts an inverted U-shaped design, extends to the outside of the main body shell and is matched with the embedded fins to form an airflow channel, so that airflow is cooled in a closed path, external dust invasion is avoided, and the heat exchange efficiency is remarkably improved by increasing the heat dissipation area; therefore, internal electronic components are guaranteed to operate at a stable temperature, signal drifting or component aging caused by overheating is reduced, the service life of equipment is prolonged, a sliding insertion structure of the damping block and the damping sleeve is matched with the damping spring, and vibration energy in the vertical direction can be preliminarily absorbed.

Provided is an optical amplifier having a high degree of integration and a small number of components that is suited for a wide wavelength band.　An optical amplifier (200) according to the present disclosure is characterized by comprising: a first optical circuit (201) that includes a band demultiplexing unit (203n) that demultiplexes input signal light for each of a plurality of wavelengths, and a first combiner array (205n) that is an array of first combiners (205) that merge and output signal light for each demultiplexed wavelength with pump light; a second optical circuit (202) that includes a band multiplexing unit (207n) that multiplexes the signal light; a fiber array (206n) that is connected between the first optical circuit (201) and the second optical circuit (202) and amplifies signal light outputted from each of the first combiners of the first optical circuit and is an array of fiber amplifiers (206); and a substrate in which the first optical circuit (201), the second optical circuit (202), and the fiber array (206n) are formed as waveguide structures for each wavelength.

The invention discloses an optical fiber breaking point positioning system and method, a terminal and a storage medium, and relates to the technical field of optical communication, and the system comprises an optical fiber link which comprises a first optical fiber and a second optical fiber; the first processing module at the first end of the optical fiber link comprises a light source and a first receiving unit; the second processing module at the second end of the optical fiber link comprises a second light source and a second receiving unit; the at least one group of erbium-doped optical fiber amplifiers are respectively arranged on the first optical fiber and the second optical fiber; the connection control module comprises a first connection control unit arranged between the first processing module and the first end of the optical fiber link, and / or a second connection control unit arranged between the second processing module and the second end of the optical fiber link; and the calculation module is in communication connection with the first receiving unit and the second receiving unit and is used for calculating and determining the position of a breaking point on the optical fiber link according to the light intensity sudden change moment of the received signal. According to the scheme, the optical fiber breaking point positioning accuracy can be improved.

The purpose of the present invention is to improve the amplification factor of an L-band signal.　The present disclosure is an optical fiber for amplification to which a rare earth element has been added, said rare earth element–added optical fiber being characterized in that: two or more cores are comprised within the cladding cross section of the optical fiber for amplification; and the core density C obtained by dividing the core number by the cladding area is 0.0008 m2 or greater, and the core radius a is 1-3.5 μm.

The invention provides a single-period oscillation microwave signal generation device and method based on frequency shift light injection locking, and relates to the technical field of microwave photonics. The device comprises a master laser, a first optical circulator, an optical attenuator, a first polarization controller, a second optical circulator, a slave laser, an optical fiber amplifier, a second polarization controller, a Brillouin ring cavity, a second optical fiber coupler, a photoelectric detector, an optical frequency shifter, an optical filter and a third polarization controller. Light emitted by the master laser is injected into the slave laser to generate a single-period oscillation optical signal, the single-period oscillation optical signal is input into the Brillouin cavity to generate Brillouin laser and is divided into two paths, and one path is subjected to photoelectric conversion to generate a microwave signal; and the other path is injected into the master laser after passing through the optical frequency shifter so as to lock the master laser, and then is injected into the slave laser by the master laser so as to lock the single-cycle oscillation optical signal. According to the invention, a stable single-frequency microwave signal can be output, and the advantages of low phase noise, high side-mode rejection ratio and wide tuning range are achieved.

The invention provides an L-band ultra-wideband high-power optical fiber amplifier and optical module capable of suppressing lasing, which comprises a plurality of amplification optical paths, a first wavelength division multiplexer and a first inclined plane pin, and is characterized in that the amplification optical paths are cascaded in sequence; the first wavelength division multiplexer is arranged between two adjacent amplification light paths, the common end of the first wavelength division multiplexer is connected with the output end of the previous stage of amplification light path, and the transmission end of the first wavelength division multiplexer is connected with the input end of the next stage of amplification light path; the first inclined plane pin is connected with the reflecting end of the first wavelength division multiplexer; the first wavelength division multiplexer is used for transmitting the ASE light in the amplification light path to the first inclined plane pin, and the first inclined plane pin is used for attenuating the received ASE light; by attenuating the ASE light in the amplification light path, the situation that the ASE light suppresses the original signal light in the light path is relieved, the transmission performance of the amplification light path is improved, the situation that the ASE light is lased is relieved, and the probability that the light path is damaged by lasing is reduced.

The embodiment of the present application provides a kind of optical fiber and optical fiber amplifier, for eliminating the helical light generated under cladding pumping condition, and reduce the loss of pump light, to improve the effective utilization of pump light.The optical fiber includes core, inner cladding, outer cladding and air hole;The core is wrapped in the inner cladding;The outer cladding wraps the core and the inner cladding;The air hole is located at the junction of the inner cladding and the outer cladding;The refractive index of the inner cladding is less than the refractive index of the core;The refractive index of the outer cladding is less than the refractive index of the inner cladding;The refractive index of the air hole is less than the refractive index of the inner cladding.

The invention provides a high-power solid-state scanning wind measurement laser radar device. The high-power solid-state scanning wind measurement laser radar device comprises a narrow-linewidth seed source, a beam splitter, a variable optical attenuator, an acoustic optical modulator, a 1 * N beam splitter, an optical fiber amplifier, a circulator, an optical antenna, a 1 * N optical switch, a 2 * 2 coupler, a balance detector, an analog-digital converter and a control processor. By optimizing laser pulse transmitting, amplifying and receiving loops, the problem that the detection distance of the wind measurement laser radar is limited due to the fact that an optical switch cannot bear high laser power is solved.

The application relates to the technical field of optical communication, and provides an automatic gain optical fiber amplifier and a gain method for optical power loss. The automatic gain optical fiber amplifier comprises a preamplifier, a transmission optical fiber, a preamplifier and a gain adjustment module. The initial optical signal is amplified through the preamplifier to obtain an amplified optical signal. The amplified optical signal carries ASE noise. The transmission optical fiber transmits the amplified optical signal to the preamplifier end. The gain adjustment module detects the optical power size of the ASE noise separated from the amplified optical signal to obtain an ASE optical power detection value. The target gain of the preamplifier is dynamically set according to the ASE optical power detection value and an ASE optical power setting value. The preamplifier compensates the amplified optical signal according to the target gain. In the case that the number of wavelengths cannot be determined, the preamplifier can dynamically compensate the optical fiber link loss introduced by the transmission optical fiber according to the target gain.

The invention discloses a radar multi-pattern interference signal generation method based on a photon radio frequency memory, and relates to the technical field of radar countermeasure. According to the method, a laser device LD, a dual-polarization quadrature phase shift keying modulator DPQPSK, an arbitrary waveform generator AWG, a vector signal generator VSG, an electrical 90-degree coupler 90-degree HC, a polarization controller PC, a polarizer Pol, an optical switch OS, an optical delay line ODL, an adjustable optical delay line TODL, a 2 * 2 optical coupler OC, an optical band pass filter OBPF, an acousto-optic frequency shifter AOFS, a photoelectric detector PD and an erbium-doped fiber amplifier EDFA are included. According to the invention, Doppler modulation is introduced to a signal by using DPQPSK, the state of an OS in a cascade optical delay loop is regulated and controlled by changing a control signal time sequence, the cycle index and delay amount of an optical signal are controlled, and an interference signal with adjustable delay length, delay resolution, Doppler frequency and false target number is generated. Flexible and tunable large instantaneous bandwidth real-time speed, distance, dense false targets, suppression and imaging interference are realized.

1. The name of the design product: plug-in optical fiber amplification and wave combining device (black frame touch screen small cabinet). 2. The use of the design product: for amplifying, combining and transmitting optical signals. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design.

The invention relates to the technical field of Brillouin distributed optical fiber sensing, and particularly discloses a BOTDA (Brillouin optical time domain analysis) optical fiber sensing device and method based on periodic scrambling noise suppression. The device comprises a laser, a first optical fiber coupler, an intensity modulator, an optical isolator, a sensing optical fiber, a microwave source, a first optical circulator, a first erbium-doped optical fiber amplifier, a second erbium-doped optical fiber amplifier, a second optical circulator, a fiber bragg grating, a photoelectric detector, a low-pass filter, a data acquisition and analysis system and a periodic scrambling module. Through a periodic progressive scrambling mechanism, the problem of polarization noise caused by the adoption of a traditional random scrambling technology in a pulse coding BOTDA system is effectively solved, the signal-to-noise ratio of the system, the stability of a measurement result and the demodulation precision are remarkably improved while it is ensured that polarization fading is eliminated, and the system performance is improved. And an effective and reliable solution is provided for high-performance long-distance distributed optical fiber sensing.