- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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302?W triple-frequency, single-mode, linearly polarized Yb-doped all-fiber amplifier
摘要： Stimulated Brillouin scattering (SBS) effect is currently the major limitation for the power scaling of single-frequency/narrow linewidth fiber laser systems. A single-mode linearly polarized all-fiber amplifier system is set up to investigate SBS effect in triple-frequency high-power amplifiers. With this amplifier, up to 302 W output power with 83% slope efficiency is achieved and the SBS threshold is scaled up to 12 dB. To the best of our knowledge, this is the highest output power of multifrequency laser from a single-mode polarization maintaining fiber. Good spectral properties and high brightness make this laser source available for the application of second harmonic generation, coherent beam combining.
关键词： nonlinear optics,fiber laser and applications
更新于2025-09-23 15:21:21
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Nearly non-dispersive propagation of Pearceya??Gaussian pulses in optical fibers close to the zero dispersion point
摘要： The propagation of Pearcey–Gaussian (PeG) pulses in optical fibers close to the zero-dispersion wavelength point is investigated. It is found an interesting phenomenon that the PeG pulses maintain the envelopes for a sufficient long propagation distance under the co-action of the second- and third-order dispersions of the fiber. This phenomenon is due to the asymmetric distribution of the pulse spectrum, which allows the contributions from the second- and third-order dispersions having opposite signs within the entire spectrum and canceling each other during propagation. This finding may become new candidates for optical fiber telecommunication.
关键词： (PeG)pulses,Nonlinear optics,Optics fiber,Dispersion
更新于2025-09-23 15:21:01
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Panda type few-mode fiber capable of both mode profile and polarization maintenance
摘要： We report the design, fabrication and characterization of panda type few-mode fiber (panda-FMF) capable of both mode profile and polarization maintenance, due to the use of two applied stress rods into the conventional FMF. The panda-FMF can support six spatial modes including LP01, LP11a, LP11b, LP21a, LP21b and LP02, and each possesses two orthogonal linear polarization modes. According to the characterization results of panda-FMF, we theoretically identify that the effective refractive index (RI) difference between either two spatial or orthogonal linear polarization modes is more than 1×10-4 over the C-band. Moreover, the experimental results verify that, both mode profile and polarization of high-order radially asymmetric modes can be perfectly maintained even under severe twist rate of 1.57 rad/m.
关键词： polarization-maintaining,fiber optics,Fiber design and fabrication,fibers
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Tailoring Donor-Acceptor Pairs of Tungsten-based Transition Metal Di-Chalcogenides (TMDCs) for Improved Photovoltaic Current Generation
摘要： We present a multifunctional scheme to implement reconfigurable temporal Fourier transformation (TFT) and temporal imaging (TI) flexibly. This structure is composed of a time lens followed by a section of dispersive fiber with proper length. More specifically, the output waveforms presenting either the spectrum profile or the scaled waveform profile of the input signal are achieved by simply changing the length of the fiber, which is theoretically analyzed and experimentally verified. This proposal requires neither the use of an input dispersive device preceding the time lens nor a second time lens after the dispersion. Hence, it is a simple and practical alternative to the implementation of both TFT and TI.
关键词： fourier optics and signal processing,optics fiber communications,time lens,four wave mixing (FWM),Dispersive Fourier transformation
更新于2025-09-19 17:13:59
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[IEEE 2019 Photonics North (PN) - Quebec City, QC, Canada (2019.5.21-2019.5.23)] 2019 Photonics North (PN) - 25 W splice-less erbium-doped fiber laser at 1584 nm
摘要： We present a multifunctional scheme to implement reconfigurable temporal Fourier transformation (TFT) and temporal imaging (TI) flexibly. This structure is composed of a time lens followed by a section of dispersive fiber with proper length. More specifically, the output waveforms presenting either the spectrum profile or the scaled waveform profile of the input signal are achieved by simply changing the length of the fiber, which is theoretically analyzed and experimentally verified. This proposal requires neither the use of an input dispersive device preceding the time lens nor a second time lens after the dispersion. Hence, it is a simple and practical alternative to the implementation of both TFT and TI.
关键词： fourier optics and signal processing,time lens,optics fiber communications,four wave mixing (FWM),Dispersive Fourier transformation
更新于2025-09-19 17:13:59
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Alternation of the Mode Synchronization and Desynchronization in Ultrafast Fiber Laser
摘要： Ultrafast fiber lasers offer a unique opportunity to implement optically a Poincaré mapping in the phase space of a variety of complex dissipative dynamical systems operating far from the equilibrium. Understanding of such complex optical dynamical systems revealing, for instance, ultrafast dynamics of the dissipative solitons (DSs) and more complex regimes is important for advancing specification and performance of the mode-locked lasers used in a vast number of applications ranging from spectroscopy and medicine to metrology and telecom. Here, using the mode-locked fiber laser as a test-bed, the Shilnikov-type ultrafast dynamics taking the form of randomly switching between noise-like pulsing and quasi-continuous-wave regimes is experimentally demonstrated. The transient coherence recovery is revealed, during which the noise-like pulse (NLP) is transformed into a coherent DS state and then returned to an incoherent NLP state. The demonstrated alternation of mode synchronization and desynchronization is both of practical importance for developing new types of partially mode-locked lasers and of the fundamental interest for the nonlinear science in the context of revealing routes to the turbulence in distributed nonlinear systems.
关键词： optical spectroscopy,nonlinear optics,fiber laser
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Two-way Optical Phase Comparison at 10 <sup>-21</sup> Level over 200-km fiber link
摘要： This works demonstrates an improved local two-way optical phase comparison method. Based on this scheme, we implement a real-time frequency comparison over a bi-directional 200-km fiber spool link with a Bi-EDFA. The achieved relative frequency stability is 9.7E-18 at 1 s integration time and reaches 1.4E-21 at 10,000 s.
关键词： Two-way Comparison,Optical Phase Transfer,Local Measurement,Fiber Optics,Fiber Network
更新于2025-09-16 10:30:52
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Self-starting all-fiber mode-locked laser based on Mamyshev mechanism with high-energy pulse generation at 1550 nm
摘要： An all-fiber mode-locked laser based on Mamyshev mechanism operating at 1550 nm was demonstrated. Self-phase modulation and offset spectral filtering provide high peak-power pulse selection in the laser cavity and induce mode locking. With selected operating parameters, the all-fiber mode-locked laser easily achieves mode locking without external seed pulses or auxiliary starting arms, making the laser convenient to operate. Pulses with maximum energy ~18 nJ and width 230 fs are obtained. Pulse width is almost unchanged with increasing pump power, while pulse energy increases linearly. Starting of the mode-locked laser based on Mamyshev mechanism and output spectra with different pump powers were experimentally investigated.
关键词： Fiber nonlinear optics,Fiber lasers,Laser mode locking,Laser cavity resonators
更新于2025-09-12 10:27:22
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Supercontinuum Generation from a Thulium Ultrafast Fiber Laser in a High NA Silica Fiber
摘要： A broadband supercontinuum is generated from a thulium ultrafast soliton fiber laser in a high numerical aperture silica fiber with low nJ seed pulse energies. Amplification of a thulium based ultrafast soliton ring fiber laser in two customized thulium doped fiber amplifiers provides pulses varying in energy between 1.8 nJ and 13.5 nJ. Coupling these seed pulses into a high numerical aperture silica fiber UHNA 7 of varying length, a systematic study of the impact of pulse energy, pulse duration and nonlinear fiber length is conducted. Based on the normal dispersion, self-phase modulation dominates for lower pump power values and results in a symmetric spectral broadening process. For higher pulse energies, four-wave mixing and Raman scattering contribute to a strong red-shift of the spectrum beyond 2.3 μm. For a fiber length of 20 m of UNHA 7, a broadband supercontinuum spanning from 1.7 μm to 2.33 μm is generated with a 20 dB spectral bandwidth of 502 nm with an output pulse energy of 4.4 nJ, corresponding to an output power of 92 mW. This represents a low seed energy threshold for efficient flat supercontinuum generation at infrared wavelengths.
关键词： Supercontinuum generation,Ultrafast optics,Fiber lasers,Thulium
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Additive Fiber Optic Probe Technology for Precise Trimming of High-Performance Lithium Niobate Photonic Integrated Circuits
摘要： Lithium Niobate (LN) is a basic material of integrated optics, for example for electro and acousto-optical modulators, switches, diffraction gratings, nonlinear optical wavelength converters and others [1]. LN based ion exchange or Ti-indiffused contact photolithographic techniques are established technologies, however, finite tolerance of optical elements could not respond some modern applications. For example, high-purity suppressed carrier synthesis or high extinction ratio pulse generation for precision measurement systems require additional active trimming electrodes [2] at the device and corresponding servo loop. Recently developed direct laser writing (DLW) of femtosecond/ultrafast laser pulses [3] can be employed to address the problem, but this method is problematic for mass production and suffer from high insertion loss in optical waveguides (typically ~1 dB/cm compared to <0.1 dB/cm for Ti in-diffused waveguides). We have proposed a method that combines low loss of Ti in-diffused technology and passive permanent trimming of DLW. Moreover, the implementation of the proposed technique is based on very cheap commercially available equipment that makes it very attractive. This is a micro-machining of a thin loading metal film on the top of a waveguide. It is based on dependence of plazmon polariton excitation efficiency on the thickness of metal film. Titanium loading film by thickness of 10 nm adds addition insertion losses (~ 1 dB/mm) and changes effective refractive index of the waveguide (~ 10-6(cid:121)10-5). The loading film was deposited in zones of the integrated optical chip which were most sensitive to its influence such as X-type direction coupler and Y-branch. The film thickness of several nanometres allows rather low laser intensity could be used for local ablation. The simple semiconductor pump laser (978 nm) for erbium doped fiber optic amplifier was used. The output fiber was exploited as a probe. The tip of the fiber was positioned close to the integrated optical chip surface. For laser power of 500 mW the intensity on the tip of the output single mode fiber was about 1 kW/mm2. The integrated optical chip was attached to a precise 3-axis translation stage that allowed flexible manipulation of the loading film micro-machining. Monitoring of optical signals (1550 nm) on the output of integrated optical chip provided possibilities on-line control of the trimming. To demonstrate the efficiency of the proposed method the adjustment of extinction ratio ER (relation of maximum transmitted optical power to its minimum) of Mach-Zehnder modulator was performed. ER is critically dependent on precise power balance in both arms of the interferometers. We demonstrate increase in ER in 17 dB (from 30 to 47 dB). Our findings can potentially be applied in modulators for quantum key distribution, precise sensing, high fidelity signal processing and others.
关键词： trimming,photonic integrated circuits,integrated optics,fiber optic probe,Lithium Niobate
更新于2025-09-12 10:27:22