The invention relates to a Fourier locking mode optical fiber laser based on photon crystal fibers. The Fourier locking mode optical fiber laser consists of an erbium-doped optical fiber amplifier, a photon crystal fiber, a dispersion shifted optical fiber, a polarization controller, a dispersion compensation fiber, an optical isolator, a 20:80 optical coupler, a tunable Fabry-Perot filter and a signal generator, and comprises a closed circuit formed by series connection of optical fibers, wherein the power ratio of the output end b and the output c of the optical coupler is 20:80; the output end e of the tunable Fabry-Perot filter is connected with the signal generator 9 through an optical fiber, and the output end b of the optical coupler is used as the output of the entire laser. The fourier locking mode optical fiber laser has the advantages of simplicity in structure, low in cost, high modulation speed, wide bandwidth, and can work stably under the normal temperature.

Fourier locking mode optical fiber laser based on photon crystal fibers

The invention discloses a pulse laser capable of continuously injecting light into a semiconductor amplifier and belongs to the technical field of optical fiber communications and photoelectron. The pulse layer comprises a first wavelength tunable narrow linewidth single-frequency laser (1), a second wavelength tunable narrow linewidth single-frequency laser (2), a 3*3 optical fiber coupler (3), a polarization controller (4), a semiconductor optical amplifier (5), a polarization dependent isolator (6), a tunable band-pass filter (7) and an erbium-ytterbium co-doped optical fiber amplifier (8); when the double-path single-frequency laser is injected into the exterior of the laser, the pulse repetition frequency is decided by the beat frequency of the double-path laser and the cavity base frequency of the laser; when the single-path single-frequency laser is injected into the exterior of the laser, the pulse repetition frequency and the pulse width are decided by the power of the single-path laser. The pulse laser has the advantages of simple structure, low cost, tunable pulse width and repetition frequency and capability of stably working at normal temperature.

Pulse laser capable of continuously injecting light into semiconductor amplifier

Dual-wavelength ring-cavity continuous-wave fiber laser based on semiconductor optical amplifier

Dual-pulse actively Q-switched fiber laser based on EOM and sagnac loop

The invention provides a mode-locked fiber laser and a pulse laser generation method, and belongs to the field of a fiber laser. The mode-locked fiber laser comprises a pumped source and a mode-locked laser resonator, and the mode-locked laser resonator comprises a reflection part, a gain fiber, a polarization-maintaining filter and a saturable absorption mirror which are successively coupled, wherein the saturable absorption mirror is used for mode locking. Pump light emitted by the pumped source penetrates into the gain fiber to generate signal light, the signal light penetrates into the saturable absorption mirror after being processed into signal light in a preset polarization direction and within a preset wavelength scope by the polarization-maintaining filter and returns to the polarization-maintaining filter after mode locking of the saturable absorption mirror, the signal light returning to the polarization-maintaining filter re-penetrates into the gain fiber and is input to the reflection part after being amplified by the gain fiber, and the portion, which meets the transmission condition of the reflection part, in the signal light amplified by the gain fiber is output. Compared to a conventional mode-locked fiber laser, the mode-locked fiber laser provided by the invention is simple in structure and high in stability and reliability, thereby facilitating engineering application.

Mode-locked fiber laser and pulse laser generation method

The invention provides a Fourier domain mode locking optical fiber laser device, which is composed of a closed circuit and a signal generator, wherein the closed circuit is formed by connecting an erbium-doped optical fiber amplifier, a high-nonlinearity optical fiber, a chromatic dispersion displacement optical fiber, a polarization controller, a chromatic dispersion compensation optical fiber, an optical isolator, an optical coupler and a tunable Fabry-Perot filter in series through an optical fiber; the tunable Fabry-Perot filter is provided with three ports; a port e is connected with the signal processor; an input port a of the optical coupler is connected with an output port of the optical isolator; the output port is provided with ports b and c; an output light power ratio of the port b and the port c is 20: 80; and 80% of the port c is connected into a laser device chamber and is connected with a port d of the tunable Fabry-Perot filter, and 20% of the port b is used as an output port of the whole laser device. The Fourier domain mode locking optical fiber laser device has the advantages that the structure is simple, the cost is low, the speed regulating speed is high, the bandwidth is wide, and the Fourier domain mode locking optical fiber laser device can work stably at a room temperature.

Fourier domain mode locking optical fiber laser device

A dark pulse laser with a tunable pulse width is composed of a single-frequency laser, a polarization controller I, a strength modulator, a high-frequency signal source, an optical circulator, a semiconductor optical amplifier or a nonlinear optical waveguide, a polarization controller II, an optical isolator, a 20:80 coupler and a bandpass filter, wherein the single-frequency laser, the polarization controller I, the strength modulator, the high-frequency signal source, the optical circulator, the semiconductor optical amplifier or the nonlinear optical waveguide, the polarization controller II, the optical isolator, the 20:80 coupler and the bandpass filter are serially connected and forms a closed loop, thereby forming a resonant chamber of the laser. The f port of the 20:80 coupler is the output end of the laser. The polarization controller I adjusts the polarization state of laser which is transmitted from the single-frequency laser. A triangular wave, a rectangular wave or a sine wave which is transmitted from the high-frequency signal source performs modulation on the single-frequency laser through a strength modulator, and furthermore the pulse width is tunable. The dark pulse laser is advantageous in that the dark pulse laser performs cross gain modulation and cross phase modulation on the laser in the resonant chamber through the laser which is fed back, thereby generating a dark pulse; and furthermore the dark pulse laser has advantages of simple structure, low cost, large pulse width tuning range, high suitability for stable operation at normal temperature, and high application prospect at a signal processing aspect.

Dark pulse laser with tunable pulse width

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Laser of Double-Pulse Based on Semiconductor Optical Amplifier

A dark pulse fiber laser consists of a semiconductor optical amplifier, an optical circulator, a band-pass filter, a single-mode fiber, a 50:50 coupler, a 20:80 coupler, an optical isolator and a polarization controller which are connected to one another through optical fibers so as to form two closed loops. By the dark pulse fiber laser, laser light in a resonant cavity is subjected to cross gain modulation and cross phase modulation through fed back laser light, and dark pulses can be generated. The dark pulse fiber laser has the advantages that the dark pulse fiber laser is simple in structure and low in cost, a pulse width tuning range is large, the dark pulse fiber laser can work at normal temperature, and the application prospect on the aspect of signal processing is high.

Xue Yuming

Papers

Fourier domain mode locking optical fiber laser device

Fourier locking mode optical fiber laser based on photon crystal fibers

Dark pulse laser with tunable pulse width

Laser of Double-Pulse Based on Semiconductor Optical Amplifier

Dark pulse fiber laser