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Switchable multi-wavelength and tunable wavelength spacing erbium-doped fiber laser based on a phase-shifted fiber Bragg grating combined with a Mach-Zehnder interferometer
摘要： A switchable multi-wavelength fiber laser with tunable wavelength spacing is proposed. It is based on a structure filter composed of a phase-shifted fiber Bragg grating (PSFBG) and a Mach-Zehnder interferometer (MZI), and the MZI is fabricated by splicing a section of polarization-maintaining fiber with two segments of multi-mode fibers. By adjusting the variable optical attenuator in the cavity and slightly changing the temperature, stable single-, dual-, triple- and quadruple-wavelength emissions can be obtained. The minimum wavelength spacing of adjacent peaks is 0.176 nm, and the maximum is 17.86 nm. The laser line emissions can be switched from 1527.684 nm to 1550.224 nm with optical signal to noise ratio of more than 50 dB. The maximum wavelength fluctuation of the fiber laser is less than 0.025 nm over 50 min. When the strain applied to the filter is changed, the tunable wavelength spacing can be achieved. The wavelength spacing of dual-wavelength laser can be continuously tuned from 21.82 nm to 22.69 nm by applying strain of 0–258 με to the filter.
关键词： Tunable,Switchable multi-wavelength,Phase-shifted fiber Bragg grating,Fiber laser
更新于2025-11-28 14:24:03
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Passively Q-switched and mode-locked Erbium-doped fiber laser with topological insulator Bismuth Selenide (Bi2Se3) as saturable absorber at C-band region
摘要： We experimentally demonstrate Q-switched and mode-locked Erbium-doped fiber laser (EDFL) by using topological insulator (TI) Bismuth Selenide (Bi2Se3) as saturable absorber (SA). The fabricated Bi2Se3 SA exhibits modulation depth and saturation intensity at 39.8% and 90.2 MW/cm2, respectively. By incorporating the fabricated Bi2Se3 SA into the laser cavity, Q-switching operation is generated with repetition rate ranging from 23.5 kHz to 68.2 kHz, pulse width ranging from 2.4 μs to 8.6 μs and maximum peak power is calculated at 19.9 mW. Our cavity can also generate soliton mode-locked pulse with repetition rate of 23.3 MHz and pulse width of 0.63 ps by inserting an additional 5 m long single mode fiber (SMF) into the existing laser cavity. Spectral peaks due to Kelly side-bands and four wave mixing (FWM) were observed on the soliton spectrum. Both Q-switching and mode-locking pulses are stable in the laboratory environment, allowing the realization of compact and low cost pulsed fiber laser with Bi2Se3 SA for various photonics applications.
关键词： Topological insulator,Bismuth-selenide,Q-switched,EDFL,Mode-locked
更新于2025-11-28 14:24:03
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - CO<inf>2</inf> Laser Inscribed Helical Long-Period Grating in Six-Mode Fiber
摘要： We fabricated the helical long-period fiber grating in a six-mode fiber with CO2 laser. The grating realize mode conversion from LP01 mode to LP21 mode with high efficiency. The mode coupling and sensing characteristics are investigated.
关键词： six-mode fiber,Helical long-period grating,mode converter
更新于2025-11-28 14:24:03
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990 nm High-power High-beam-quality DFB Laser With Narrow Linewidth Controlled By Gain-coupled Effect
摘要： High-power single-longitudinal-mode regrowth-free gain-coupled distributed feedback laser diode based on ridge waveguide with periodic current injection is achieved at 990 nm. Our device is fabricated only by standard i-line lithography with micron-scale precision, obtains an excellent performance at high injection current. A continuous-wave power of over 0.681 W is achieved at 3 A. The maximum continuous-wave power at single-longitudinal-mode operation is up to 0.303 W at 1.4 A. Narrow linewidth emission has been reached with a 3 dB spectrum width less than 1.41 pm. The high side mode suppression ratio is over 35 dB. The lateral far field divergence angle is only 15.05 °, the beam quality factor M 2 is 1.245, achieving a laterally near-diffraction-limit emission. It is more beneficial for single mode fiber coupling as pumping sources and other applications which require high beam quality at high power with easy fabrication technique.
关键词： narrow linewidth,Single-longitudinal mode,Gain-coupled DFB,Semiconductor lasers
更新于2025-11-28 14:24:03
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Mode-locked All-fiber Laser Emitting Two-color High-order Transverse Mode
摘要： We demonstrate that the mode-locked all-?ber laser can simultaneously emit two-color broadband LP11 transverse mode in the near-infrared region by sharing a common mode-selective coupler (MSC). The MSC mode converter is designed to achieve simultaneous dual-channel mode conversion corresponding to the wavelength regions at 1.0 (cid:22)m and 1.5 (cid:22)m, in which each channel possesses broadband mode conversion from LP01 to LP11 mode with high mode purity. As a proof of concept, we implement an all-?ber ytterbium (Yb) and erbium (Er) doped ?ber lasers with mode-locked two-color LP11 modal output. The laser consists of two ring cavities combined with a common MSC mode converter. The generated LP11 modal pulses have a full width at half maximum (FWHM) of 11 nm and 8.1 nm for Yb- and Er-doped ?ber laser (YDFL and EDFL), respectively. The presented ?ber laser would represent a promising light source in the ?eld of structured light and ultrafast optics.
关键词： Two-color,mode-locking,MSC,dual-channel mode conversion
更新于2025-11-28 14:24:03
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Cylindrical Vector Beam Fibre Laser Based on photonic lantern
摘要： We demonstrate a linear-cavity continuous-wave (CW) fibre laser generating cylindrical vector beams (CVBs) using a photonic lantern as transverse mode converter and mode splitter. The CVB fibre laser operates at a center wavelength of 1553.1 nm, with a 3 dB linewidth of less than 0.08 nm and a signal-to-background ratio of > 45 dB. The measured purity of the radially and azimuthally polarized beams is > 96%.
关键词： continuous-wave,Cylindrical Vector Beam,photonic lantern
更新于2025-11-28 14:24:03
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Dispersion independent mode-locked erbium-doped fiber laser with a chirped fiber Bragg grating
摘要： We propose and demonstrate a dispersion-independent erbium-doped mode-locked fiber laser by incorporating a chirped fiber Bragg grating (CFBG) into the laser cavity. Our experimental results show that the fiber laser has similar output characteristics, no matter which section of the CFBG is connected to the laser cavity through a circulator, i.e., opposite dispersion is introduced into the laser cavity. Dispersion independent feature is attributed to the relatively large nonlinearity of the laser cavity with certain bandwidth. This enriches the laser dynamics and provides a new idea for the design of new lasers.
关键词： mode-locked,fiber laser.,Chirped fiber Bragg grating
更新于2025-11-28 14:24:03
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Stable and compact nanosecond pulse seed source with diode laser driven by a high-speed circuit and a temperature control circuit
摘要： We demonstrated a nanosecond pulse seed source with a diode laser (DL) of 1550 nm A short pulse generator and a short pulse driver came to form a high-speed circuit that drove the seed source. A temperature control circuit was employed to control the stability of the laser pulses. The experimental results provided that continuously adjustable 5 kHz to 25 MHz repetition frequency and 3.5 ns to 51 ns pulse duration were acquired. The ?ne tuning of pulse duration of seed signals was realized by adjusting the current of the laser in its operating current range. Stability of the output power over two hours was 0.13% at repetition frequency of 25 MHz and pulse duration of 3.5 ns, respectively.
关键词： Short pulse generator,Temperature control,Short pulse driver,Pulse seed source,Nanosecond pulse
更新于2025-11-28 14:24:03
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Wide-Spectrum Pulsed Fiber Laser based on Picosecond Pulse Generation Supercontinuum
摘要： We demonstrated a wide-spectrum pulsed fiber laser by using supercontinuum (SC) generate from a narrow pulse width fiber laser pump into high nonlinear fiber (HNLF). The pulse width of wide-spectrum pulsed fiber laser is 7.95ps and the repetition frequency is 4GHz with a 20nm bandwidth. It is found that the anomalous dispersion region near the zero dispersion wavelength has a better stability by observing the wide spectrum pulses in different bands.
关键词： different dispersion region,super-continuum,wide-spectrum pulsed fiber laser,narrow pulse width
更新于2025-11-28 14:24:03
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An All-Optical, Actively Q-Switched Fiber Laser by an Antimonene-Based Optical Modulator
摘要： Q-switched ?ber lasers are of great interest in industrial material processing, nonlinear frequency conversion, spectroscopy etc. However, passive Q-switching possesses drawbacks of degradation and failure of the saturable absorber and the di?culty in accurate modi?cation of the repetition rate. To overcome these issues, active Q-switching that can normally modulate the cavity quality-factor by an externally-driven Q-switcher is in high demand. Herein, an actively Q-switched laser with antimonene-based all-optical modulator is devised based on the high photo-thermal e?ciency (48%) and broadband response in antimonene. It is demonstrated that this actively modulated laser represents all-optically tunable output parameters (e.g., output repetition rate), environmental stability, and easy synchronization. It is anticipated that this actively antimonene-based all-optical modulator with advantages of large modulation depth, low energy consumption, and high conversion e?ciency has great potential in all-optical information processing and pulsed laser engineering.
关键词： actively Q-switching,antimonene,2D materials,all-optical modulators
更新于2025-11-28 14:24:03