53 results about "Soliton pulse" patented technology

Provided a pre-chirped management based low-noise fiber femtosecond laser amplifier. The amplifier comprises an ytterbium-doped fiber dispersion management mode-locked laser (1), a spectral interference filter (2), a grating negative dispersive delay line (3), an ytterbium-doped fiber amplifier (4), and a grating pulse compressor (5). The ytterbium-doped fiber dispersion management mode-locked laser (1) generates a breathing soliton pulse sequence; the spectral interference filter (2) adjusts a center wavelength of the breathing soliton pulse sequence and enables it in the gain spectrum center of the ytterbium-doped fiber amplifier (4); the grating negative dispersive delay line (3) introduces a negative chirp into the adjusted breathing soliton pulse sequence, thereby obtaining a seed pulse; the ytterbium-doped fiber amplifier carries out self-similar amplification on the seed pulse, thereby obtaining a parabolic pulse; and the grating pulse compressor (5) compresses the parabolic pulse and generates a femtosecond laser pulse. According to the high-frequency noise of a linear amplifier effectively inhibited by the pre-chirped management based low-noise fiber femtosecond laser amplifier disclosed by the present invention, a Fourier transform-limited femtosecond laser pulse with a narrow pulse width is obtained.

The invention discloses a multi-dimensional multiplexing soliton optical fiber laser device which comprises a laser pump source and an annular laser resonant cavity consisting of a gain medium, a dispersive medium, a wavelength division multiplexer, an optical coupler, an optical circulator, a polarization controller and a polarizer. The laser pump source and the gain medium work together so as toprovide a gain amplification mechanism for laser device operation. The dispersive medium can be used for chromatic dispersion compensation of pulse laser so as to achieve chromatic dispersion management of an internal optical path of the laser device, and the optical circulator is a non-reciprocal optical transmission device for coupling the chromatic dispersion medium to construct a bidirectional transmission optical path structure. Via use of the polarization controller, a local polarization state of the internal optical path of the laser device can be changed, and mode-locking operation ofthe pulse laser and adjustment and switching of a mode-locking state can be realized. The multi-dimensional multiplexing soliton optical fiber laser device of the invention can be used for bidirectional transmission, and mode-locking laser pulses can be respectively obtained, generation of polymorphic soliton pulses can be supported, and a wideband wavelengths tuning function and a multiple wavelength switching function can be fulfilled via output laser pulses.

A device and technique for aligning an optical carrier signal (e.g., a soliton pulse train) with a data signal in a transmitter. According to the invention, the device is configured to analyze the radio frequency (RF) spectrum of the transmitter's output. In one implementation, the device evaluates the amount of energy in a certain frequency band located near a selected null of the RF spectrum. In another implementation, the device examines the shape of the RF spectrum within that frequency band. In either case, based on the analysis, the device adjusts the phase of the clock signal driving an electro-optic (E/O) modulator in the transmitter. Such adjustment reduces misalignment between the optical carrier signal and data resulting, e.g., from thermal effects in the E/O modulator. The device may be used, e.g., in long-haul optical transmission systems operating at 10 GBit/s.

The invention discloses an all-fiber laser system and method for generating a soliton burst mode and aims to solve the technical problem that it is difficult for a conventional fiber laser to directlyoutput a burst-mode soliton pulse. The system includes a passive mode-locked fiber laser (1), an isolator (2), an optical fiber amplifier (3), a photonic crystal fiber (4), a programmable optical filter (5), a first single-mode fiber (6), a coupler (7) and a second single-mode fiber (8) which are successively connected. The all-fiber laser system is simple and compact in structure and good in stability, achieves, by adjusting the filtering bandwidth and the filtering wavelength interval of the programmable optical filter (5), a controllable pulse number inside a soliton cluster and a continuously adjustable pulse repetition frequency at the order of GHz, greatly reduces system cost, can be directly applied to the field of micromachining, and can also be used as a seed source for a high-energy pulse amplifier.

Providing a soliton mode-locked solid-state laser that includes a resonator, a first end of which is formed of a semiconductor saturable absorption mirror, a solid-state laser medium, a negative group velocity dispersion compensator for compensating for group velocity dispersion within the resonator, and an excitation optical system that outputs excitation light for exciting the solid-state laser medium, and oscillates soliton pulse laser light with a repetition frequency of not less than 1 GHz, an intensity modulator that includes a waveguide electrooptic modulator for modulating intensity of the soliton pulse laser light and a driver for applying a voltage to the waveguide electrooptic modulator according to desired information, and a nonlinear optical element for converting the intensity-modulated soliton pulse laser light to a second harmonic wave.

The invention discloses a double-cladding thulium-doped all-fiber ultrafast laser based on nonlinear polarization rotation mode locking and relates to a laser. By single-mode passive optical fibers, a beam combiner, a double-cladding thulium-doped fiber, an isolator, a polarized controller, an optical coupler and a polarizer are sequentially connected to form an annular optical-fiber resonance cavity, a pumping source injects pumping light into the annular optical-fiber resonance cavity through a pumping light input port of the beam combiner, and resonance is made in an output cavity of the output end of an optical coupler to generate soliton laser pulse. By adjustment of the polarized controller, double refraction in the cavity is changed to realize optical soliton pulse output, pulse width is 1.6 ps, pulse energy is 80 pj, pulse repetition frequency is 15MHz, 3dB band width is 4.45 nm, and the central wavelength is 2042 nm. In a 2-micrometer all-fiber laser, output of optical soliton pulse is realized.

In a soliton mode-locked solid-state laser apparatus having a resonator which includes therein a solid-state laser medium, a saturable absorption mirror, and a negative group velocity dispersion element, the solid-state laser medium and saturable absorption mirror are disposed in close proximity to each other at a distance not greater than twice a Rayleigh length. Then, the absorption modulation depth ΔR of the the saturable absorption mirror is set to a value not less than 0.4%, and the absolute value |D|(D<0) of a total intracavity dispersion amount D when light having a predetermined wavelength makes one round trip in the resonator, which is represented by the following relational expression, is set within a pulse bandwidth in which operation modes other than a fundamental period soliton pulse can be suppressed by the saturable absorption mirror.

The invention provides a pre-chirp and SSFS (Soliton Self-Frequency Shift) based wavelength space adjustable double-color soliton pulse light source system which is suitable for the technical field of lasers. The wavelength space adjustable double-color soliton pulse light source system comprises a femtosecond laser, a pre-chirp optical device, a lens and an anomalous dispersion optical fiber along the direction of an optical path; the femtosecond laser is used for generating a first soliton and a second soliton; the energy of the input pulse of the femtosecond laser can be adjusted and the soliton order number N is increased along with the increase of the energy of the input pulse; the pre-chirp optical device is used for adjusting the width of the input pulse to ensure that the wavelength of the first soliton is maintained to be unchanged under the condition that the soliton order number is improved; the adjustment direction on the width of the input pulse is the same as that of the energy of the input pulse of the femtosecond laser. According to the wavelength space adjustable double-color soliton pulse light source system, the wavelength space tuning between the two solitons is based on the basic attribute of soliton components in high-order solitons, namely that the higher the soliton order number N, the closer the peak power and the pulse width of the two solitons, and accordingly the wavelength space between the two solitons after the SSFS is small.

The invention, which belongs to the technical field of optical frequency combs, discloses a method for generating time domain cavity solitons and soliton frequency combs based on an intracavity pumping mode. According to the invention, with an intracavity pumping Kerr nonlinear optical cavity, a Brillouin gain is introduced into the cavity and generated Brillouin laser serves as intracavity pumping light, and a laser cavity is coherently driven to spontaneously generate time domain cavity solitons; and the intracavity pumping light generates soliton frequency combs through a cascaded four-wavemixing effect. Therefore, a cavity soliton pulse and a soliton frequency comb with the tunable repetition frequency are obtained by changing the frequency interval of a multi-wavelength laser source.

The invention discloses an all-fiber ultrashort pulse light source capable of simultaneously generating a soliton and a noise-like pulse and belongs to the light information technology field. A technical problem that an existing all-fiber ultrashort pulse light source is single in output pulse working state is solved. The light source comprises a first pumping source, a second pumping source, a first wavelength division multiplexer, a second wavelength division multiplexer, an erbium-doped optical fiber, a first coupler, a high nonlinear optical fiber, a second coupler, a first polarization controller, a polarization dependent isolator, an optical circulator, a reflective variable optical attenuator and a second polarization controller. In the invention, an attenuation-controllable mode locking structure and a double-coupler light splitting structure are adopted; in a same laser resonant cavity structure, a soliton pulse with stable performance and a noise-like pulse with high pulse energy can be output at the same time, practicability of the all-fiber ultrashort pulse light source is improved, cost is greatly reduced, and the all-fiber ultrashort pulse light source can be appliedto the fields of light communication, sensing, imaging, nonlinear frequency conversion and the like.

In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror in which high-index layers and low-index layers, having optical thicknesses randomly varying in the range of one-eighth to half of the predetermined wavelength, are alternately laminated, and the negative-dispersion mirror causes a mirror dispersion of −1000 fsec² to −100 fsec² and realizes a reflectance of 97% to 99.5%.

An optical communications system comprises a laser (10) controlled to output a stream of soliton pulses (12) coupled to a beamsplitter arrangement (14, 20, 22) which converts the pulse stream (12) to a stream of pulses (24) having twice the pulse rate. This stream of pulses (24) is modulated to form a binary coded signal by modulator (24) as a series of binary digits each having one of two values in which a series of n optical soliton pulses, where n is an integer>1 is coupled into an optical fibre (4) at each occurrence of one of the two values. The optical fibre (4) and repeaters (6) provide a transmission link to a receiver (8). The present invention allows one to increase the average power within a bit without having to operate with shorter pulses that would otherwise be necessary with one soliton pulse per bit of prior art systems in order to avoid the limits inherent in single soliton pulse per bit prior art systems. The result is that the ASE noise limit is moved to longer pulses so allowing higher bit rates notwithstanding that there is a greater number of solitons in each bit of data than with single soliton per bit scheme of modulation. The method also reduces GH the jitter and thus opens the window of operation by pushing the G-H limit to longer pulses

In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by three or more multilayer mirrors and cavity layers arranged at predetermined intervals between the three or more multilayer mirrors, and causing a mirror dispersion of −3000 fsec² to −600 fsec² and realizes a reflectance of 97% to 99.5%.

The invention discloses an optical fiber laser system for generating a soliton burst mode, and aims to solve the technical problem that an existing optical fiber laser is difficult to directly outputa burst mode soliton pulse. The system comprises a double-pulse bound soliton fiber laser (1), a fiber amplifier (2), a first fiber circulator (3), a first chirped fiber bragg grating (4), an opticaltime delay line (5), a phase modulator (6), a microwave source (7), a second fiber circulator (8) and a second chirped fiber bragg grating (9). The laser system realizes the output of the explosion mode soliton pulse, has the advantages of compact structure, low system cost, good stability and the like, can be directly applied to the field of micromachining, and can also be used as a seed source of a high-energy pulse amplifier.

The invention discloses a full-fabric wavelength-tunable ultrashort-pulse laser which comprises an erbium-doped fiber femtosecond laser source (1) and the like. The erbium-doped fiber femtosecond laser source (1), an erbium-doped optical fiber amplifier (2), a first lens combination (3), a first large-mode-field diameter optical fiber (4), a second lens combination (5), a first dichroic mirror (6), a thulium-doped fiber amplifier (7), a third lens combination (8), a second large-mode-field diameter optical fiber (9), a fourth lens combination (10) and a second dichroic mirror (11) are sequentially connected through space light. According to the full-fabric wavelength-tunable ultrashort-pulse laser, laser generated by an ultrashort pulse tuning technology achieved through a fiber soliton self-frequency shift effect is narrower in width and better in pulse quality compared with an initial pulse, and a wide range of tuning can be achieved for the wavelength; if the erbium-doped optical fiber amplifier and the thulium-doped fiber amplifier are utilized for conducting cascade pumping on fiber soliton pulse at different wave bands, the wavelength tuning range can be expanded to a 3 micron wave band from a 1.55 micron wave band.

An apparatus and method for generating a wavelength-tunable short pulse that can generate wavelength-tunable short pulsed light in the visible-light wavelength band are provided. When ultrashort pulsed light is introduced into an optical fiber (3), a wavelength-tunable ultrashort soliton pulse is generated by a nonlinear optical effect through the soliton effect and Raman scattering. When the soliton pulse has a short duration and high peak intensity, a third harmonic having one-third of the wavelength of the soliton pulsed light is generated by a third nonlinear optical effect. This third harmonic has a short wavelength in the visible light band.

The invention belongs to the optical soliton technology field and particularly relates to an optical soliton pulse generator formed by an erbium-doped-fiber laser. The optical soliton pulse generator formed by erbium-doped-fiber laser comprises a 1*2 optical coupler (1), a 1*N optical switch (2), an optical fiber group (3), a 1*N optical coupler (4), a saturable absorber (5), an optical isolator (6), an erbium-doped fiber (7), an optical wavelength division multiplexer (8), a pump light source (9) and a polarization controller (10). According to the optical soliton pulse generator formed by the erbium-doped-fiber laser, soliton in multiple types such as a ground state optical soliton pulse and a dissipation soliton pulse and bound state multi-soliton of the ground state optical soliton pulse and the dissipation soliton pulse can be obtained in the same passive mode-locking erbium-doped fiber laser system, the performance is stable, and the repeatability is good.

A mode-locking solid-state laser apparatus is a soliton-type mode-locking solid-state laser apparatus, having a solid-state laser medium, a saturable absorption mirror and a negative group velocity dispersion element in a resonator, wherein the solid-state laser medium and he absorption mirror are disposed at a distance not greater than twice a Rayleigh length. Then, the absorption modulation depth Delta R of the saturable absorption mirror is set to a value not less than 0.4%, and the absolute value lDl of a total intracavity dispersion amount when light having a predetermined wavelength makes one round trip in the resonator, which is represented by the following mathematic expression (1), is set within a pulse bandwidth in which operation modes other than a fundamental period soliton pulse can be suppressed by the saturable absorption mirror.

The invention discloses a high-speed optical soliton transmission system under Raman amplification and a computing method for a soliton spectrum, which build the high-speed optical soliton transmission system, modify a soliton transmission equation and give the computing method for the soliton spectrum by adopting backward pump Raman amplification technology. The high-speed soliton pulse transmission system built by the invention has good performance, a simple structure, low cost and easy use, and overcomes the shortages of the prior optical pulse transmission system; and the corresponding computing method provides powerful support for pulse transmission system optimization and intensive study of the field. The system and the computing method can be applied in the fields of high-speed pulse transmission and high-speed communication.

The invention relates to an optical soliton impulse compact characteristic calculating program, belonging to the technical field of fiber communication. The calculating program can calculate the compact characteristic of cross polarization optical soliton impulse under various conditions by regulating different parameters (such as amplitude of input impulse, impulse time domain width, initial time domain interval, initial chirp C, size of time domain window used in calculating, sampling points, different fiber parameters and transmission distances), and solves the problem that the compact characteristic of the optical soliton is difficult to analyze and study in a process of designing and optimizing an optical logic device and a polarization multiplexing system. The calculating program is easy and understandable, has convenient operation, powerful functions, high calculating speed, convenient drawing and strong practicality, can modify related parameters according to actual condition to carry out related study under various conditions, provides powerful support for optimization of fiber communication systems and related key devices (such as optical soliton switches and other optical logic devices) and further study in the field, and pushes fast development of the subject.

The invention relates to a wideband tunable optical parametric chirped pulse amplification system based on soliton self-frequency shift. Stretch soliton pulse laser generated by a pulsed laser is transmitted as a seed signal to an all-fiber chirped pulse amplification system composed of a stretcher, an amplifier and a compressor. Then the ultrashort pulse laser is outputted into an optical fiber frequency shift system composed of two different types of nonlinear fiber cascade structures. The 2-10mum wideband tunable ultrashort pulse laser generated by the optical fiber frequency shift system is outputted to a crystal of BaGa2GeSe6 structure, the crystal is connected with a laser source for matching the phase of the tunable ultrashort pulse laser and the wideband tunable mid-infrared ultrashort laser is outputted through the crystal. The generation of super-continuum spectrum laser in the optical fiber laser system and the high-energy laser system can be effectively suppressed and the energy conversion efficiency of the seed signal in the optical parametric chirped pulse amplification system can be greatly improved.