- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Ultrafast soliton and stretched-pulse switchable mode-locked fiber laser with hybrid structure of multimode fiber based saturable absorber
摘要： We demonstrate an all-fiber mode locked laser based on hybrid structure of multimode fiber saturable absorber (SA) that can realize both conventional soliton and stretched-pulse states. Stable 16.44 MHz conventional soliton pulses are achieved by injecting 80 mW threshold pump power. By increasing the incident pump power to 420 mW, the laser evolves from soliton operation into stretched-pulse mode locking state. 310 fs stretched-pulse are obtained with the same repetition rate as the soliton pulses. The center wavelength and its 3 dB spectrum bandwidth are 1603 nm and 14.2 nm, respectively. For the first time, we experimentally confirm transition between conventional soliton and stretched-pulse in 1.5 μm mode-locked fiber laser by introducing multimode optical fiber SA. Moreover, the maximum single pulse energy of nearly 1 nJ is achieved. Such all-fiber mode-locked lasers based on hybrid structure of multimode fiber are attractive for practical applications without damage and the limitation of life time.
关键词： hybrid structure,mode-locked fiber laser,multimode fiber,saturable absorber,Ultrafast soliton,stretched-pulse
更新于2025-11-28 14:24:03
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L-band tunable and dual-wavelength mode locked fiber laser with NCF-GIMF based SA
摘要： A hybrid structure of no-core fiber and graded-index multimode fiber (NCF-GIMF) is demonstrated, which can be used as both the saturable absorber (SA) and the wavelength selective element. By employing such a device, an L-band wavelength tunable Er-doped mode-locked laser is realized and stable single solitons of ~1.7ps, with continuously tunable wavelengths from 1574 nm to 1601.1 nm, are generated. Moreover, dual-wavelength mode-locked laser operation at 1575.4 nm and 1603 nm is achieved, with pulse duration of 1.2 ps and 1.7 ps, respectively. The proposed device is simple and compact, and represents an effective approach for tunable and dual-wavelength mode-locked fiber laser operation.
关键词： Laser tuning,Optical fiber devices,Laser mode locking,Fiber-graded index multimode fiber,Fiber nonlinear optics
更新于2025-11-28 14:23:57
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Research on the influence of alignment error on coupling efficiency and beam quality for Gaussian beam to multimode fiber
摘要： The effect of alignment error on the coupling efficiency and beam quality of a Gaussian beam coupled into a large-core multimode fiber is studied in this paper. The equations for evaluating the effect of alignment error on the coupling efficiency are derived separately, and verified with the method of simulation. The calculation and simulation results obtained are highly consistent. In the same way, the effects of alignment error on the beam power distribution are discussed. The results show that the lateral error will change the path of partial light to a large extent, and have a greater influence on the power distribution of the Gaussian beam than the longitudinal error and angular error do.
关键词： Multimode fiber,Coupling efficiency,Beam quality,Alignment error
更新于2025-09-23 15:23:52
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Multicore Multimode Fiber-A New Type of Fiber Using Coupled-Core Structures
摘要： A new type of multimode fiber, multicore multimode fiber (MCMMF), which uses coupled multicore structure is proposed. The fiber has a large number of single mode cores with optimized coupling to achieve high bandwidth. A theoretical model for analyzing the MCMMF is developed. The effect of fiber parameters, such as index contrast, core radius, and core spacing on the bandwidth is systematically studied. Numerical simulations show that the bandwidth of a MCMMF can be optimized by choosing correct ratio of core spacing to core radius for a given profile design. In addition, mode coupling among the super-modes can further increase the bandwidth due to the small spacing in effective indices in coupled core structures. A MCMMF with 165 cores is fabricated. High bandwidth of 8.4 GHz·km in the 850 nm window is achieved. Using this fiber and a VCSEL-based 25 Gb/s SR transceiver, error free transmission though 150 m fiber is demonstrated.
关键词： fiber characterization,fiber bandwidth,data center,multimode fiber,Coupled multicore fiber,fiber design,fiber fabrication
更新于2025-09-23 15:21:01
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Analysis of the Errors Caused by Disturbed Multimode Fibers in the Interferometer with Fiber-Coupled Delivery
摘要： In this paper, the errors of the displacement measurement interferometer with multi-mode fiber-coupled delivery are analyzed when the fibers are disturbed. Simulation results show that the characteristic frequency of the measurement error is consistent with that of disturbance, and the error has higher order frequency components. The experiments are designed for the effect of fringe contrast on the measurement error. The experimental results show that the measurement error is rather sensitive to the interference angle between the measurement arm and the reference arm in the multi-mode fibers, but not to the irradiance ratio of the measurement arm and the reference arm. In an interferometer with multimode fiber, the interference angle between the measurement arm and the reference arm needs to be restricted. This conclusion provides a theoretical basis for designing an interferometer measurement system with interference angle that is adaptive to wider application.
关键词： fringe contrast,multimode fiber,interferometer,interference angle,disturbance error
更新于2025-09-23 15:19:57
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[IEEE 2019 International Conference on Artificial Intelligence and Advanced Manufacturing (AIAM) - Dublin, Ireland (2019.10.16-2019.10.18)] 2019 International Conference on Artificial Intelligence and Advanced Manufacturing (AIAM) - A Dynamic Real-Time Three-Dimensional Attitude Reconstruction Method Based on Multi-Core Optical Fiber Subtitle as Needed
摘要： We have developed a 5 × 5 mm2 compact silicon-photonic receiver with a 28-nm CMOS transimpedance-amplifier (TIA) chip. The receiver chip was designed using a photonics—electronics convergence design technique for the realization of high-speed and high-efficiency operation because the interfaces of the optical and electrical components greatly influence the receiver characteristics. Optical pins were used to obtain easy optical alignment between the multimode fibers and the germanium photodetectors. An aluminum stripline between the PD and the TIA enhanced the 3-dB bandwidth because its characteristic impedance is greater than the TIA input impedance. Coplanar waveguides (CPWs) on the etched SOI wafer achieved a low insertion loss because the overlap between the electric fields of the CPWs and the silicon layer was reduced. We demonstrated 25-Gb/s error-free operation at both 25 and at 85 °C. The minimum sensitivities and power consumptions of the receivers were ?11.0 dBm and 2.3 mW/Gb/s at 25 °C and ?10.2 dBm and 2.5 mW/Gb/s at 85 °C, respectively. These results show that our receiver can be applied for practical use at high temperatures.
关键词： CMOS transimpedance amplifier,multimode fiber transmission,optoelectronic integrated circuit,optical interconnections,optical receivers,silicon photonics
更新于2025-09-23 15:19:57
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[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - Smart Stack Technology for III-V/Si Multi-Junction Solar Cells
摘要： We have developed a 5 × 5 mm2 compact silicon-photonic receiver with a 28-nm CMOS transimpedance-amplifier (TIA) chip. The receiver chip was designed using a photonics—electronics convergence design technique for the realization of high-speed and high-efficiency operation because the interfaces of the optical and electrical components greatly influence the receiver characteristics. Optical pins were used to obtain easy optical alignment between the multimode fibers and the germanium photodetectors. An aluminum stripline between the PD and the TIA enhanced the 3-dB bandwidth because its characteristic impedance is greater than the TIA input impedance. Coplanar waveguides (CPWs) on the etched SOI wafer achieved a low insertion loss because the overlap between the electric fields of the CPWs and the silicon layer was reduced. We demonstrated 25-Gb/s error-free operation at both 25 and at 85 °C. The minimum sensitivities and power consumptions of the receivers were ?11.0 dBm and 2.3 mW/Gb/s at 25 °C and ?10.2 dBm and 2.5 mW/Gb/s at 85 °C, respectively. These results show that our receiver can be applied for practical use at high temperatures.
关键词： optoelectronic integrated circuit,silicon photonics,optical interconnections,CMOS transimpedance amplifier,optical receivers,multimode fiber transmission
更新于2025-09-19 17:13:59
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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) - Spectral Impacts on the Performance of mc-Si and New-Generation CdTe Photovoltaics in the Brazilian Northeast
摘要： We have developed a 5 × 5 mm2 compact silicon-photonic receiver with a 28-nm CMOS transimpedance-amplifier (TIA) chip. The receiver chip was designed using a photonics—electronics convergence design technique for the realization of high-speed and high-efficiency operation because the interfaces of the optical and electrical components greatly influence the receiver characteristics. Optical pins were used to obtain easy optical alignment between the multimode fibers and the germanium photodetectors. An aluminum stripline between the PD and the TIA enhanced the 3-dB bandwidth because its characteristic impedance is greater than the TIA input impedance. Coplanar waveguides (CPWs) on the etched SOI wafer achieved a low insertion loss because the overlap between the electric fields of the CPWs and the silicon layer was reduced. We demonstrated 25-Gb/s error-free operation at both 25 and at 85 °C. The minimum sensitivities and power consumptions of the receivers were ?11.0 dBm and 2.3 mW/Gb/s at 25 °C and ?10.2 dBm and 2.5 mW/Gb/s at 85 °C, respectively. These results show that our receiver can be applied for practical use at high temperatures.
关键词： optoelectronic integrated circuit,silicon photonics,optical interconnections,CMOS transimpedance amplifier,optical receivers,multimode fiber transmission
更新于2025-09-19 17:13:59
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Sixteen-Pixel NbN Nanowire Single Photon Detector Coupled With 300-??m Fiber
摘要： Niobium nitride (NbN) nanowires have a high repetition rate and efficiency, making them ideal for superconducting nanowire single photon detectors (SNSPDs). However, it is difficult to fabricate NbN arrays over large areas, which is critical for various applications. This paper describes a 4 × 4 NbN SNSPD array (16 pixels) and optical coupling with a 300-μm-diameter multimode fiber using beam compression technology. This is the first NbN SNSPD coupled with such large-diameter fibers. The designed pixels are positioned as closely as possible (pixel filling factor about 98.5%), almost without dead area between them. This results in a system efficiency of 46% and a quantum efficiency of 94.5% for photons (λ = 1064 nm) coupled from multimode fibers. An intrinsic time resolution of less than 69 ps can be obtained. The proposed high-performance single photon detector is suitable for satellite laser ranging. Furthermore, the proposed system is feasible for large SNSPD arrays with NbN, paving the way for the development of efficient photon cameras with NbN nanowires.
关键词： single-photon detector,Multimode fiber,satellite laser ranging,niobium nitride
更新于2025-09-16 10:30:52
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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) - Spatial Kerr Beam Self-Cleaning in Yb-Doped Multimode Fiber Taper
摘要： Spatial Kerr beam self-cleaning (KBSC), which transforms an output speckled beam in a quasi-single mode beam in graded index (GRIN) multimode optical fibers (MMFs), has been reported recently [1,2]. GRIN MMFs are also interesting waveguides for supercontinuum (SC) generation in the visible and near infrared regions, as successfully demonstrated by launching femtosecond or subnanosecond pulses in the anomalous (1550 nm) or normal (1064 nm) dispersion regime, respectively [1,3]. The spectral broadening features were explained through the interplay between spatiotemporal multimode soliton oscillations and dispersive wave generation in fibers with parabolic index profile. On the other hand, tapered optical fibers are well known to provide a number of useful features, including strong mode confinement capability, small scale diameter and broad SC generation [4,5]. Herein, we report visible-short infrared SC generation in combination with KBSC in long (~10 m) tapered Yb-doped MMFs, with parabolic index profile and parabolic doping concentration.
关键词： supercontinuum generation,Spatial Kerr beam self-cleaning,graded index multimode optical fibers,Yb-doped multimode fiber taper
更新于2025-09-12 10:27:22