| 1. |
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| 2. |
- Chen, Daru, et al.
(författare)
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Wavelength-spacing continuously tunable multiwavelength erbium-doped fibre laser based on DSF and MZI
- 2007
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 43:9, s. 524-525
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Tidskriftsartikel (refereegranskat)abstract
- A novel multiwavelength erbium-doped fibre laser is proposed by incorporating a section of dispersion-shifted fibre (DSF) and a Mach-Zehnder interferometer (MZI). The wavelength spacing of the fibre laser can be continuously tuned by adjusting an optical variable delay line in the MZI-based comb filter. Stable multiwavelength lasing at room temperature with the standard ITU (International Telecommunication Union) channel spacing of 0.2 nm (25 GHz), 0.4 nm (50 GHz), 0.8 nm (100 GHz) or 1.6 nm (200 GHz) is demonstrated.
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| 3. |
- Gao, Shiming, et al.
(författare)
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Bandwidth enhancement methods of telecom-region entangled twin photons via quasi-phase-matched spontaneous parametric down-conversion
- 2006
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Ingår i: Journal of nonlinear optical physics and materials. - 0218-8635. ; 15:4, s. 513-521
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Tidskriftsartikel (refereegranskat)abstract
- We theoretically present the bandwidth enhancement methods of the telecom-region entangled twin photons generated by quasi-phase-matched (QPM) spontaneous parametric down-conversion (SPDC) in periodically poled lithium niobate (PPLN) crystals. By using type I (e --> e + e) SPDC, the degenerate entangled twin photons will have a broad bandwidth and it can be further enhanced by shortening the crystal length, detuning the pump wavelength or adjusting the working temperature of the PPLN crystal. This principle provides the possibility to introduce wavelength-division-multiplexed technique into quantum information systems.
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| 4. |
- Gao, Ying, et al.
(författare)
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ALL-OPTICAL FREQUENCY CONVERTER BASED ON FIBER FOUR-WAVE MIXING FOR BIDIRECTIONAL RADIO-OVER-FIBER SYSTEMS
- 2009
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Ingår i: Microwave and optical technology letters (Print). - : Wiley. - 0895-2477 .- 1098-2760. ; 51:6, s. 1542-1545
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Tidskriftsartikel (refereegranskat)abstract
- A frequency up/down-converter is proposed based on fiber-four-wave-mixing (FWM) between the output of a dual-wavelength fiber laser and the modulated optical carrier for bidirection radio-over-fiber (RoF) systems. Frequency, up-conversion from 1.50 to 11.08 GHz and down-conversion from 10.60 to 1.02 GHz are successfully demonstrated and a small efficiency difference between up- and down-conversions has been achieved. A proposal of setting up a bidirectional RoF system based on fiber FWM frequency converter is presented.
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| 5. |
- Gao, Shiming, et al.
(författare)
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Four-wave mixing in left-handed materials
- 2007
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Ingår i: Journal of nonlinear optical physics and materials. - 0218-8635. ; 16:4, s. 485-496
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Tidskriftsartikel (refereegranskat)
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| 6. |
- Gao, Shiming, et al.
(författare)
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Two channels of entangled twin photons generated by quasi-phase-matched spontaneous parametric down-conversion in periodically poled lithium niobate crystals
- 2008
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Ingår i: Journal of the Optical Society of America. B, Optical physics. - 0740-3224 .- 1520-8540. ; 25:5, s. 734-740
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Tidskriftsartikel (refereegranskat)abstract
- We propose the generation of two-channel time-energy entangled twin photons based on two simultaneous first-order quasi-phase-matched (QPM) spontaneous parametric down-conversion processes in a periodically poled lithium niobate (PPLN) with a monochromatic pump. The theoretical model for the generation of the entangled photons is established, and the analytical solution is obtained in a lossless crystal with an undepleted pump assumption. The generated condition of entangled photons is achieved in terms of the QPM grating period and the pump wavelength. It is shown that two channels of entangled twin photons with different wavelengths can be created by suitably choosing the PPLN grating period once the pump wavelength is fixed, which provides the potential to introduce the wavelength division multiplexed technique into quantum information systems.
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| 7. |
- Kristanl, Matej, et al.
(författare)
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The Seventh Visual Object Tracking VOT2019 Challenge Results
- 2019
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Ingår i: 2019 IEEE/CVF INTERNATIONAL CONFERENCE ON COMPUTER VISION WORKSHOPS (ICCVW). - : IEEE COMPUTER SOC. - 9781728150239 ; , s. 2206-2241
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Konferensbidrag (refereegranskat)abstract
- The Visual Object Tracking challenge VOT2019 is the seventh annual tracker benchmarking activity organized by the VOT initiative. Results of 81 trackers are presented; many are state-of-the-art trackers published at major computer vision conferences or in journals in the recent years. The evaluation included the standard VOT and other popular methodologies for short-term tracking analysis as well as the standard VOT methodology for long-term tracking analysis. The VOT2019 challenge was composed of five challenges focusing on different tracking domains: (i) VOT-ST2019 challenge focused on short-term tracking in RGB, (ii) VOT-RT2019 challenge focused on "real-time" short-term tracking in RGB, (iii) VOT-LT2019 focused on long-term tracking namely coping with target disappearance and reappearance. Two new challenges have been introduced: (iv) VOT-RGBT2019 challenge focused on short-term tracking in RGB and thermal imagery and (v) VOT-RGBD2019 challenge focused on long-term tracking in RGB and depth imagery. The VOT-ST2019, VOT-RT2019 and VOT-LT2019 datasets were refreshed while new datasets were introduced for VOT-RGBT2019 and VOT-RGBD2019. The VOT toolkit has been updated to support both standard short-term, long-term tracking and tracking with multi-channel imagery. Performance of the tested trackers typically by far exceeds standard baselines. The source code for most of the trackers is publicly available from the VOT page. The dataset, the evaluation kit and the results are publicly available at the challenge website(1).
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| 8. |
- Lei, Qiyun, et al.
(författare)
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Broadband transparent and flexible silver mesh for efficient electromagnetic interference shielding and high-quality free-space optical communication
- 2023
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Ingår i: Optical Materials Express. - : Optica Publishing Group. - 2159-3930 .- 2159-3930. ; 13:2, s. 469-483
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Tidskriftsartikel (refereegranskat)abstract
- A broadband transparent and flexible silver (Ag) mesh is presented experimentally for the first time for both efficient electromagnetic interference (EMI) shielding in the X band and high-quality free-space optical (FSO) communication. High transmission is achieved in a broad wavelength range of 0.4-2.0 mu m. The transmittance of the Ag mesh relative to the substrate is around 92% and the sheet resistance is as low as 7.12 ohm/sq. The Ag mesh/polyethylene (PE) achieves a high average EMI shielding effectiveness (SE) of 28.8 dB in the X band with an overall transmittance of 80.9% at 550 nm. High-quality FSO communication with small power penalty is attributed to the high optical transmittance and the low haze at 1550 nm, superior to those of the Ag NW networks. With a polydimethylsiloxane (PDMS) coating, the average EMI SE is still up to 26.2 dB and the overall transmittance is increased to 84.5% at 550 nm due to antireflection. The FSO communication does not change much due to the nearly unchanged optical property at 1550 nm. Both the EMI shielding performance and the FSO communication function maintain after 2-hour chemical corrosions as well as after 1000 bending cycles and twisting. Our PDMS/Ag mesh/PE sandwiched film can be self-cleaned, suitable for outdoor applications.
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| 9. |
- Sun, Bing, et al.
(författare)
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Wavelength-Spacing-Tunable Double-Pumped Multiwavelength Optical Parametric Oscillator Based on a Mach-Zehnder Interferometer
- 2012
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 30:12, s. 1937-1942
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Tidskriftsartikel (refereegranskat)abstract
- A novel double-pumped ring cavity multiwavelength fiber optical parametric oscillator (MW-FOPO) with tunable wavelength spacing is proposed. In the MW-FOPO, we utilize a highly nonlinear dispersion-shifted fiber as the gain medium and a Mach-Zehnder interferometer as the comb-like filter. Twenty-four-wavelength lasing of the double-pumped MW-FOPO with a ripple less than +/- 4.3 dB and a wavelength spacing of about 0.8 nm in a wavelength range from 1541 to 1558 nm is experimentally demonstrated. The wavelength spacing can be continuously tuned and multiwavelength lasings with wavelength spacings of 0.08, 0.2, 0.4, and 0.8 nm are demonstrated, respectively. We discussed the power stability of the multiwavelength lasing of the double-pumped MW-FOPO. A comparison of the output spectra among the double-pumped MW-FOPO, the single-pumped MW-FOPO, and the multiwavelength erbium-doped fiber laser is also presented.
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