17 results about "Nonlinear optical fiber" patented technology

The invention discloses an optical fiber link physical parameter estimation method based on a multichannel feature input neural operator, and belongs to the technical field of optical fiber communication. The method comprises the following steps: acquiring signals of a transmitting end and a receiving end under different channel parameters, and respectively calculating multiple groups of weighting and observation data corresponding to loss, dispersion and nonlinear effect according to a nonlinear evolution equation for describing optical signal transmission; splicing the observation data and processing the observation data into a high-dimensional complex feature sequence; a frequency domain operator block comprising a parallel complex frequency spectrum and a time domain convolution branch is designed to extract and fuse the features, and aggregation representation of the channel features is obtained through Fourier transform and frequency domain attention pooling; and outputting estimated dispersion and nonlinear real number parameters through a plurality of multi-layer perceptron and a linear projection layer. According to the method, physical priori knowledge of optical fiber transmission is integrated into the deep neural operator, so that the parameter estimation capability and the model generalization performance of long-distance, strong-dispersion and strong-nonlinearity optical fiber links are improved.

This invention discloses a high-speed sweeping fiber optic light source. The specific device includes: a mode-locked pulse light source, an optical fiber amplifier, a highly nonlinear optical fiber, and a dispersion-compensating optical fiber. The passively mode-locked pulse light source outputs a high repetition rate, wide-spectrum mode-locked pulse. Its dispersion propagation follows a parabolic differential equation similar to one-dimensional paraxial diffraction, analogous to Fraunhofer diffraction. The pulse is amplified outside the cavity by an optical fiber amplifier to increase the laser pulse energy and peak power. Then, it is broadened by the highly nonlinear optical fiber to obtain a supercontinuum light source. Finally, the pulse is stretched by a highly dispersive medium provided by the dispersive optical fiber, and the pulse frequency domain spectrum is mapped to a time domain waveform, thereby realizing a high-speed sweeping frequency light source in the time domain.

A spectral domain optical coherence tomography (OCT) system utilizes an electrowetting prism having four isolated electrodes and configured to deflect a light beam according to an actuating control signal applied to the electrodes. The control signal causes the light beam to laterally scan over a sample. The light beam is produced by a broad bandwidth laser and light from the sample and a reference path is provided to a spectrometer for analysis. The light source may be an all-normal-dispersion fiber laser seeding a gain-managed nonlinear fiber amplifier. The electrowetting prism is capable of scanning up to ±6°. The system is low power and operates at kHz speed.

A mid-infrared laser generation system based on dispersion-managed soliton bunch pulses. The system can achieve high-power, high-efficiency and high-proportion mid-infrared laser output, and has the advantages of an all-fiber configuration, a compact structure and a high power proportion in a longer-wavelength region of a mid-infrared spectrum. A pulsed fiber laser device generates a nanosecond pulse laser in a 1.5-micron band. A fiber pulse stretcher is made of a single-mode silica fiber, splits nanosecond pulses into a plurality of ultrafast soliton pulses by means of a nonlinear effect, and performs spectral energy conversion from 1.5 microns to 2.4 microns. A fiber laser amplifier further increases the output power of a stretched pulse laser and extends a spectrum to a 2.7-micron band, and also increases pulse energy beyond a 2.3-micron band. A fiber mode field adapter efficiently couples into a nonlinear fiber pulses generated in the fiber laser amplifier. The nonlinear fiber extends a laser to a mid-infrared 3-5-micron band, thereby achieving high-power, high-efficiency and high-proportion mid-infrared laser output.

The application discloses a pulse ultrafast measurement system based on a time domain amplification method, comprising a reference pulse generation device, wherein the reference pulse generation device is sequentially connected with a first dispersion compensation optical fiber, a first power amplification device and a pulse shaping device; the pulse shaping device is connected with a light combiner; the light combiner is sequentially connected with a high nonlinear optical fiber, a first filter, a third dispersion compensation optical fiber, a second power amplification device and a first oscilloscope; the application further comprises a signal to be measured, wherein the signal to be measured is connected with a second dispersion compensation optical fiber, and the second dispersion compensation optical fiber is connected with the light combiner; the application further discloses a pulse ultrafast measurement method based on the time domain amplification method.

The utility model discloses an ultraviolet optical fiber optical parametric oscillator based on tunable picosecond green light. The ultraviolet optical fiber optical parametric oscillator comprises a high-power wavelength and repetition frequency adjustable 1 [mu] m laser system, a high-power second harmonic generation device and an optical fiber optical parametric oscillator, the high-power wavelength and repetition frequency adjustable 1 [mu] m laser system comprises a mode-locked fiber laser, a pulse stretcher, an adjustable fiber filter, a fiber pre-amplifier, a fiber collimator and a solid amplifier. According to the utility model, the wavelength of ultraviolet laser can be flexibly adjusted; through a narrow-band filtering technology, the generation efficiency of the ultraviolet laser is improved; an optical parametric oscillator based on a nonlinear optical fiber is designed, a more compact resonant cavity structure is realized, the influence of a heat effect on system efficiency and stability is inhibited, and ultraviolet laser with an excellent light spot mode can be output; the dispersion parameter of the nonlinear optical fiber can be regulated and controlled, so that the phase matching condition of four-wave mixing is optimized, and the efficiency and wavelength tuning range of ultraviolet laser are further improved.

This invention provides a U-band high-energy square-wave pulsed Raman light source module. It first achieves initial stable amplification of the seed light through forward pumping with a 100-watt pump source, followed by high-energy main amplification through reverse pumping with a kilowatt-level pump source. Both stages of Raman amplification utilize highly nonlinear optical fibers as the gain medium to significantly enhance the stimulated Raman scattering effect, efficiently converting pump light energy into signal light and improving overall Raman gain and energy conversion efficiency. Simultaneously, it balances the stability of the amplification process with the integrity of the pulse waveform, thereby achieving a smooth, step-by-step amplification of the U-band pulsed seed light. Ultimately, it stably outputs high-energy U-band square-wave pulsed light with a single pulse energy ≥5μJ and a pulse width of 80–120ns, significantly improving the light source's output performance and better meeting the application requirements of long-distance fiber optic communication expansion and atmospheric methane remote sensing.

The application relates to the field of optical technology and discloses a second-order soliton trap transmission state regulation method based on an optical event horizon simulation, which comprises the following steps: preparing a second-order soliton pulse and an external probe pulse, wherein the second-order soliton pulse is generated through the balance of dispersion and nonlinearity in a nonlinear optical fiber, the external probe pulse is a weak power pulse, the group velocity parameter of the second-order soliton pulse and the external probe pulse is measured, and group velocity matching and group velocity mismatch conditions are set; through accurate setting of the group velocity matching and mismatch conditions and quantitative calculation of the refractive index change caused by the soliton pulse based on the Kerr effect, an equivalent event horizon is defined, definite physical parameter benchmarks and stable potential well environments are provided for transmission state regulation, the stability of a soliton potential well action boundary can be determined and ensured, the transmission state misjudgment problem caused by potential well drift and distortion is overcome, and the accuracy of the regulation process and the predictability of the result are ensured.

A kind of multi-threshold phase encoding-based all-optical quantization system belongs to all-optical analog-digital conversion field.It includes high repetition frequency femtosecond pulse light source,1×M optical splitter,phase-shifted optical quantization module, soliton self-frequency shift module and multi-threshold encoding module;The phase-shifted optical quantization module is M-path electro-optic modulator;The soliton self-frequency shift module includes first M-path high nonlinear fiber,M-path single-mode fiber and second M-path high nonlinear fiber;The multi-threshold encoding module includes M wavelength division multiplexer,M×N optical delay line array,M×N photodetector array and encoding module.The present application uses multi-threshold encoding module of phase encoding,realizes simultaneous judgment of multiple threshold points on power transmission curve of M electro-optic modulators, solves code type repetition problem of all-optical quantization system,realizes more effective quantization states with less channel number,improves quantization precision.Meanwhile,quantization bit number of the present application is improved to log2(2MN).

The invention discloses a space-time wave packet modulation signal generation and anti-turbulence optical communication device, belongs to the technical field of optical systems, and aims to solve the problems in the prior art. The device comprises a 1530nm laser, an electro-optical modulator, a signal generator, an erbium-doped fiber amplifier (EDFA), a first polarization isolator, a 1530nm / 1625nm wavelength division multiplexer, a high-nonlinearity fiber, a first polarization controller, a second polarization isolator, an output coupler, a dispersion compensation fiber, a circulator, a semiconductor saturable absorption mirror (SESAM), a second polarization controller and a chirped pulse fiber amplifier (CPA). The system comprises a first collimator, a first diffraction grating, a first cylindrical lens, a multi-phase plane, a plane mirror, a second cylindrical lens, a second diffraction grating, a spherical lens, a cubic beam splitter, a beam analyzer CMOS, a collimation and beam expanding lens group, a receiving antenna, a power meter, a photoelectric detector and a field programmable gate array FPGA. And stable signal transmission is realized.

This invention discloses a wide-tunable single-passband microwave photonic filter and its construction method. The filter includes a light source device for generating a supercontinuum light source, comprising a generator, an RF power amplifier, a DFB laser, a first erbium-doped fiber amplifier, a first variable optical attenuator, and a highly nonlinear fiber connected in sequence. An optical filter for selecting a certain width of supercontinuum light source is connected between the light source device and a MZI structure for spectral segmentation of the supercontinuum light source. The MZI structure is connected to a photodetector via a single-mode fiber and a second erbium-doped fiber amplifier. The photodetector is connected to the MZI structure via a vector network analyzer. This application features a simple structure, low cost, and the constructed complex coefficient filter eliminates the fundamental frequency response.

The application discloses a single-seed-source-based all-fiber flat ultraviolet-mid-infrared supercontinuum laser, which comprises a seed laser, two-stage ytterbium-erbium-doped fiber amplifiers, a high-nonlinear fiber NL-1550, a large-mode-field ytterbium-erbium-doped fiber amplifier, a large-mode-field ytterbium-doped fiber amplifier, a photonic crystal fiber and a passive fluorine-doped fiber which are connected in sequence; wherein the seed laser outputs seed pulse laser of 1.55 mu m, and finally outputs supercontinuum laser with a spectral range of 370-4500 nm, covering ultraviolet-mid-infrared bands. The application adopts an all-fiber structure, has high stability and portability, reduces the loss in the process of light transmission and the system complexity, realizes double-wavelength pumping through a seed source, and realizes super-flat spectral output covering ultraviolet to mid-infrared through a multi-stage amplification structure and a multi-stage nonlinear medium structure.

The application discloses a single-pump four-wave mixing light source, which utilizes a light source spectrum widening technology generated by a third-order nonlinear effect in an optical fiber, and achieves spectrum conversion and light power transfer by injecting high-power pump light into a high-nonlinear optical fiber, so as to realize a wide-spectrum light source and high output power. The spectrum width and the power are related to the pump light source power and the parameters of the nonlinear optical fiber, and the light source power has no upper limit in theory. As a light source, the application can improve the detection precision of a high-precision fiber interferometer.

The application discloses a nonlinear wide spectrum fiber light source, which is a technology for expanding the spectrum of a light source by using the third-order nonlinear effect in an optical fiber. High-power laser with two wavelengths is injected into a high nonlinear optical fiber as pumping light to achieve spectrum conversion and light power transfer, so that a wide spectrum light source and high output power are realized. The width and power of the spectrum of the light source are related to the pumping light power and the parameters of the nonlinear optical fiber. The light source power theoretically has no upper limit. The light source is used for a high-precision fiber interferometer, which is a brand-new technical approach.

The embodiment of the present application provides a kind of adjustable all-optical shaper, adjustable all-optical shaper parameter determination method and device.The shaper includes: MZI shaping module, first directional coupler and second directional coupler;MZI shaping module includes: upper arm and lower arm;The output end of first directional coupler is connected with the input end of MZI shaping module respectively;Upper arm includes: nonlinear optical fiber and adjustable optical phase shifter, for the nonlinear phase shift of one of the two optical signals in nonlinear optical fiber, and the phase shift of one optical signal after nonlinear phase shift is carried out by adjustable optical phase shifter with preset phase shift value;Lower arm includes: linear optical fiber, for the linear phase shift of one of the two optical signals in linear optical fiber;The input end of second directional coupler is connected with the upper arm and the lower arm of MZI shaping module.

The application provides an octave light frequency comb generation system, which can be applied to the fields of light frequency precision measurement and optical clock, etc. The octave light frequency comb generation system comprises a double-pumped Brillouin loop subsystem and a nonlinear optical fiber spectrum expansion subsystem. The application utilizes dispersion compensation and pulse narrowing technology to expand the light frequency comb generated by the double-pumped Brillouin loop subsystem to an octave light frequency comb. Fiber gratings are used to suppress two pump lights in the Brillouin light frequency comb, which is simpler and more practical than space light modulator filtering. Dispersion compensation optical fiber is used for pulse shaping, and fiber amplifier is used to improve the pulse peak power entering the second high nonlinear optical fiber, and the second high nonlinear optical fiber utilizes self-phase modulation and four-wave mixing effect for spectrum expansion. Thus, the embodiment of the application solves the problem of low pulse energy of the double-pumped Brillouin light frequency comb, and realizes high-repetition-rate octave light frequency comb.

This invention discloses a demultiplexed comb-shaped Brillouin source generator for spectral synthesis, comprising a laser generator, a highly nonlinear optical fiber, and a demultiplexing grating. The laser generator is used to modulate and generate a first pump comb laser and a first signal comb laser. The highly nonlinear optical fiber is connected to the laser generator and is used to reverse-transmit the first pump comb laser and the first signal comb laser, so that the first pump comb laser and the first signal comb laser, under the action of stimulated Brillouin gain, form a comb-shaped Brillouin laser of a preset frequency. The demultiplexing grating is used to separate the preset frequency spectral lines from the comb-shaped Brillouin laser of the preset frequency. This invention, by adjusting the frequency interval difference between the first pump comb laser and the first signal comb laser, under the action of the spectral vernier effect, uses an asynchronous optical field to drive the generation of a comb-shaped Brillouin laser with an adjustable frequency interval.