The Experts below are selected from a list of 7950 Experts worldwide ranked by ideXlab platform
Pu Zhou - One of the best experts on this subject based on the ideXlab platform.
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All-fiberized cascaded random Raman fiber laser with high Spectral Purity based on filtering feedback
Applied optics, 2019Co-Authors: Tianfu Yao, Yang Zhang, Yizhu Chen, Liangjin Huang, Jinyong Leng, Hu Xiao, Pu ZhouAbstract:Cascaded random Raman fiber lasers (CRRFLs) with simple configuration and high Spectral Purity have become a great candidate for power scaling over the 1.1 µm-2 µm Spectral band. Recently, CRRFLs with high Spectral Purity over 90% have been proposed by applying a highly temporal-stable pump source or a free-space short-pass filter, at the cost of increased system complexity. In this work, pumped directly by a Yb-doped fiber oscillator at 1080 nm, an all-fiberized and simplified CRRFL with a short-pass optical filter based on bending fiber and a thin-film wavelength division multiplexer is demonstrated. The transmission loss of the filter for 5th Stokes order at 1440 nm is up to 70 dB. Spectral Purity over 92% for all the first four Stokes orders is achieved. The highest output power is 15 W for the 4th Stokes order at 1341 nm.
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Tunable random Raman fiber laser at 1.7 µm region with high Spectral Purity.
Optics express, 2019Co-Authors: Yang Zhang, Jiaxin Song, Tianfu Yao, Pu ZhouAbstract:We demonstrate a tunable, high order cascaded random Raman fiber laser (RRFL) with high Purity at 1.7 µm band by using a high power amplified spontaneous emission source (ASE) with both wavelength and linewidth tunability as pump source. The influence of the Spectral bandwidth of the ASE source on the Spectral Purity of the output at 1.7 µm band is investigated. By adjusting the Spectral bandwidth of the ASE source to the optimized 20 nm, output power >14 W with Spectral Purity up to 98.29% at 1715 nm is achieved. As far as we know, this is the highest Spectral Purity ever reported for a RRFL at 1.7 µm region. Furthermore, by adjusting the central wavelength of ASE source, the output of the RRFL can be tuned from 1695 to 1725 nm with >10 W output power. What’s more, the Spectral Purity is above 92% over a tuning range from 1705 to 1725 nm.
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Phosphosilicate fiber-based dual-wavelength random fiber laser with flexible power proportion and high Spectral Purity.
Optics express, 2019Co-Authors: Jiaxin Song, Yang Zhang, Pu ZhouAbstract:Phosphosilicate fiber has the inherent advantage of generating dual-wavelength output owing to the two Raman gain peaks at the frequency shifts of ∼13.2 THz (silica-related) and 39.9 THz (phosphorus-related), respectively. The frequency shift of 39.9 THz is often adopted to obtain long wavelength laser, while the control of Stokes light at 13.2 THz has attracted much attention currently. In this paper, a dual-wavelength random distributed feedback Raman fiber laser (RDFL) with over 100 nm wavelength interval and continuously tunable power proportion was presented based on phosphosilicate fiber for the first time. Through using the filtered amplified spontaneous emission (ASE) source as the pump source, the Spectral Purity of the Stokes light could be as high as 99.8%. By tuning two manual variable optical attenuators (VOAs), the power proportion of the silica-related Stokes light could range from ∼0% to 99.0%, and the maximum value is limited by the generation of second order Stokes light. Although the power handling capability of the VOA is merely 2 W, over 23 W total output power of the Stokes light was obtained thanks to the particular power distribution property of RDFL. This experiment demonstrates the potential to achieve a flexible high-power and high-Spectral Purity dual-wavelength RDFL output.
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Tunable Random Raman Fiber Laser at 1.7 μm Region with High Spectral Purity
2019 18th International Conference on Optical Communications and Networks (ICOCN), 2019Co-Authors: Yang Zhang, Jiaxin Song, Tianfu Yao, Pu ZhouAbstract:We demonstrate a cascaded random Raman fiber laser at 1715 μm with the record high Purity of 98.29%. Furthermore, the wavelength tunability from 1705 to 1725 nm with Spectral Purity over 92% is achieved firstly.
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Tapered-fiber-enabled high-power, high-Spectral-Purity random fiber lasing.
Optics letters, 2018Co-Authors: Hanwei Zhang, Pu Zhou, Xiaolin Wang, Jinyong LengAbstract:Random distributed feedback Raman fiber laser is a new kind of light source that can be applied to generate a high-power laser. In this Letter, we report on a high-power, high-Spectral-Purity random Raman fiber laser based on tapered fiber, in which the four-wave mixing (FWM) effect has been sufficiently suppressed. By choosing an appropriate tapered fiber length, we achieve a maximum random laser output of 491 W, and the Spectral Purity can reach to as high as 94%. We carefully compare the influence of different tapered fiber lengths and splicing patterns on the FWM effect by the cutting-back method and lateral-offset splicing. The results show that the transverse modes dispersion is responsible for the appearance of FWM by compensating the phase mismatch. It is believed that a kilowatt-level random laser can be obtained by further optimizing the parameters of tapered fiber.
Yang Zhang - One of the best experts on this subject based on the ideXlab platform.
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All-fiberized cascaded random Raman fiber laser with high Spectral Purity based on filtering feedback
Applied optics, 2019Co-Authors: Tianfu Yao, Yang Zhang, Yizhu Chen, Liangjin Huang, Jinyong Leng, Hu Xiao, Pu ZhouAbstract:Cascaded random Raman fiber lasers (CRRFLs) with simple configuration and high Spectral Purity have become a great candidate for power scaling over the 1.1 µm-2 µm Spectral band. Recently, CRRFLs with high Spectral Purity over 90% have been proposed by applying a highly temporal-stable pump source or a free-space short-pass filter, at the cost of increased system complexity. In this work, pumped directly by a Yb-doped fiber oscillator at 1080 nm, an all-fiberized and simplified CRRFL with a short-pass optical filter based on bending fiber and a thin-film wavelength division multiplexer is demonstrated. The transmission loss of the filter for 5th Stokes order at 1440 nm is up to 70 dB. Spectral Purity over 92% for all the first four Stokes orders is achieved. The highest output power is 15 W for the 4th Stokes order at 1341 nm.
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Tunable random Raman fiber laser at 1.7 µm region with high Spectral Purity.
Optics express, 2019Co-Authors: Yang Zhang, Jiaxin Song, Tianfu Yao, Pu ZhouAbstract:We demonstrate a tunable, high order cascaded random Raman fiber laser (RRFL) with high Purity at 1.7 µm band by using a high power amplified spontaneous emission source (ASE) with both wavelength and linewidth tunability as pump source. The influence of the Spectral bandwidth of the ASE source on the Spectral Purity of the output at 1.7 µm band is investigated. By adjusting the Spectral bandwidth of the ASE source to the optimized 20 nm, output power >14 W with Spectral Purity up to 98.29% at 1715 nm is achieved. As far as we know, this is the highest Spectral Purity ever reported for a RRFL at 1.7 µm region. Furthermore, by adjusting the central wavelength of ASE source, the output of the RRFL can be tuned from 1695 to 1725 nm with >10 W output power. What’s more, the Spectral Purity is above 92% over a tuning range from 1705 to 1725 nm.
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Phosphosilicate fiber-based dual-wavelength random fiber laser with flexible power proportion and high Spectral Purity.
Optics express, 2019Co-Authors: Jiaxin Song, Yang Zhang, Pu ZhouAbstract:Phosphosilicate fiber has the inherent advantage of generating dual-wavelength output owing to the two Raman gain peaks at the frequency shifts of ∼13.2 THz (silica-related) and 39.9 THz (phosphorus-related), respectively. The frequency shift of 39.9 THz is often adopted to obtain long wavelength laser, while the control of Stokes light at 13.2 THz has attracted much attention currently. In this paper, a dual-wavelength random distributed feedback Raman fiber laser (RDFL) with over 100 nm wavelength interval and continuously tunable power proportion was presented based on phosphosilicate fiber for the first time. Through using the filtered amplified spontaneous emission (ASE) source as the pump source, the Spectral Purity of the Stokes light could be as high as 99.8%. By tuning two manual variable optical attenuators (VOAs), the power proportion of the silica-related Stokes light could range from ∼0% to 99.0%, and the maximum value is limited by the generation of second order Stokes light. Although the power handling capability of the VOA is merely 2 W, over 23 W total output power of the Stokes light was obtained thanks to the particular power distribution property of RDFL. This experiment demonstrates the potential to achieve a flexible high-power and high-Spectral Purity dual-wavelength RDFL output.
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Tunable Random Raman Fiber Laser at 1.7 μm Region with High Spectral Purity
2019 18th International Conference on Optical Communications and Networks (ICOCN), 2019Co-Authors: Yang Zhang, Jiaxin Song, Tianfu Yao, Pu ZhouAbstract:We demonstrate a cascaded random Raman fiber laser at 1715 μm with the record high Purity of 98.29%. Furthermore, the wavelength tunability from 1705 to 1725 nm with Spectral Purity over 92% is achieved firstly.
Jiaxin Song - One of the best experts on this subject based on the ideXlab platform.
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Tunable random Raman fiber laser at 1.7 µm region with high Spectral Purity.
Optics express, 2019Co-Authors: Yang Zhang, Jiaxin Song, Tianfu Yao, Pu ZhouAbstract:We demonstrate a tunable, high order cascaded random Raman fiber laser (RRFL) with high Purity at 1.7 µm band by using a high power amplified spontaneous emission source (ASE) with both wavelength and linewidth tunability as pump source. The influence of the Spectral bandwidth of the ASE source on the Spectral Purity of the output at 1.7 µm band is investigated. By adjusting the Spectral bandwidth of the ASE source to the optimized 20 nm, output power >14 W with Spectral Purity up to 98.29% at 1715 nm is achieved. As far as we know, this is the highest Spectral Purity ever reported for a RRFL at 1.7 µm region. Furthermore, by adjusting the central wavelength of ASE source, the output of the RRFL can be tuned from 1695 to 1725 nm with >10 W output power. What’s more, the Spectral Purity is above 92% over a tuning range from 1705 to 1725 nm.
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Phosphosilicate fiber-based dual-wavelength random fiber laser with flexible power proportion and high Spectral Purity.
Optics express, 2019Co-Authors: Jiaxin Song, Yang Zhang, Pu ZhouAbstract:Phosphosilicate fiber has the inherent advantage of generating dual-wavelength output owing to the two Raman gain peaks at the frequency shifts of ∼13.2 THz (silica-related) and 39.9 THz (phosphorus-related), respectively. The frequency shift of 39.9 THz is often adopted to obtain long wavelength laser, while the control of Stokes light at 13.2 THz has attracted much attention currently. In this paper, a dual-wavelength random distributed feedback Raman fiber laser (RDFL) with over 100 nm wavelength interval and continuously tunable power proportion was presented based on phosphosilicate fiber for the first time. Through using the filtered amplified spontaneous emission (ASE) source as the pump source, the Spectral Purity of the Stokes light could be as high as 99.8%. By tuning two manual variable optical attenuators (VOAs), the power proportion of the silica-related Stokes light could range from ∼0% to 99.0%, and the maximum value is limited by the generation of second order Stokes light. Although the power handling capability of the VOA is merely 2 W, over 23 W total output power of the Stokes light was obtained thanks to the particular power distribution property of RDFL. This experiment demonstrates the potential to achieve a flexible high-power and high-Spectral Purity dual-wavelength RDFL output.
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Tunable Random Raman Fiber Laser at 1.7 μm Region with High Spectral Purity
2019 18th International Conference on Optical Communications and Networks (ICOCN), 2019Co-Authors: Yang Zhang, Jiaxin Song, Tianfu Yao, Pu ZhouAbstract:We demonstrate a cascaded random Raman fiber laser at 1715 μm with the record high Purity of 98.29%. Furthermore, the wavelength tunability from 1705 to 1725 nm with Spectral Purity over 92% is achieved firstly.
V. R. Supradeepa - One of the best experts on this subject based on the ideXlab platform.
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High power, ultra-high Spectral Purity, broadly wavelength tunable cascaded Raman fiber laser
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: V. Balaswamy, S Harshitha, Siddharth Ramachandran, V. R. SupradeepaAbstract:Cascaded Raman fiber lasers is the only proven technology which enables high power continuous wave (CW) fiber laser sources outside rare-earth emission bandwidths. Among these systems, recently demonstrated cascaded Raman fiber lasers based on Random distributed feedback (RDFB) provide wavelength agility enabling high-power, ultra-broad band wavelength tunable fiber lasers. However, these systems are limited in terms of power scaling due to degrading Spectral Purity with increasing input pump power which in turn limits the applicability of these systems. This is due to conversion of desired wavelength into next higher order Raman stokes with increase in pump power. In this work, we demonstrate a high power, ultra-high Spectral Purity, broadly wavelength tunable cascaded Raman fiber laser. This was enabled by culmination of two significant advances over the last year. To terminate the Raman cascade at the required output wavelength, we utilized our recently proposed distributed filtered feedback mechanism. To achieve high Spectral Purity, we used a recently demonstrated technique of using high power fiber based Amplified Spontaneous emission (ASE) sources as the input pump. A maximum output power of ~33W at 1.5μm and ~27W at 1.4μm was achieved. High Spectral Purity of
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high power ultra high Spectral Purity broadly wavelength tunable cascaded raman fiber laser
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: V. Balaswamy, S Harshitha, Siddharth Ramachandran, V. R. SupradeepaAbstract:Cascaded Raman fiber lasers is the only proven technology which enables high power continuous wave (CW) fiber laser sources outside rare-earth emission bandwidths. Among these systems, recently demonstrated cascaded Raman fiber lasers based on Random distributed feedback (RDFB) provide wavelength agility enabling high-power, ultra-broad band wavelength tunable fiber lasers. However, these systems are limited in terms of power scaling due to degrading Spectral Purity with increasing input pump power which in turn limits the applicability of these systems. This is due to conversion of desired wavelength into next higher order Raman stokes with increase in pump power. In this work, we demonstrate a high power, ultra-high Spectral Purity, broadly wavelength tunable cascaded Raman fiber laser. This was enabled by culmination of two significant advances over the last year. To terminate the Raman cascade at the required output wavelength, we utilized our recently proposed distributed filtered feedback mechanism. To achieve high Spectral Purity, we used a recently demonstrated technique of using high power fiber based Amplified Spontaneous emission (ASE) sources as the input pump. A maximum output power of ~33W at 1.5μm and ~27W at 1.4μm was achieved. High Spectral Purity of <97% at the final wavelength was achieved over a wide-range of output powers.
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Achieving High-Power, Ultra-High Spectral Purity Cascaded Raman Fiber Lasers through Low Intensity-Noise Pump Sources
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO Europe-EQEC), 2019Co-Authors: V. Balaswamy, B. S. Vikram, Piyush Raj, M. R. Harshitha, Divya Nair, V. R. SupradeepaAbstract:Cascaded Raman fiber lasers (CRFLs) based on random distributed feedback are proven to be wavelength agile where, by simply adjusting the input pump power and wavelength, high-power continuous wave fiber lasers at arbitrary wavelengths were demonstrated [1–3]. However, these systems have limited degree of wavelength conversion or Spectral Purity defined as the percentage of output power in the desired wavelength band. Recently, use of fiber-based amplified spontaneous emission (ASE) sources have been proposed to increase the Spectral Purity [4]. In [4] authors attributed relative intensity noise (RIN) of the pump laser, as the reason for reduction in Spectral Purity. Here, we comprehensively investigate the role of RIN on Spectral Purity by using three kinds of pump lasers for cascaded Raman conversion. We demonstrate that by using high-power, phase-modulated (PM) narrow-linewidth fiber amplifier as the pump source, ultra-high Spectral Purity of >97% over the entire Raman stokes orders (from 1.1μm to 1.5μm) can be achieved.
L Maleki - One of the best experts on this subject based on the ideXlab platform.
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high Spectral Purity kerr frequency comb radio frequency photonic oscillator
Nature Communications, 2015Co-Authors: Wei Liang, Danny Eliyahu, V S Ilchenko, Anatoliy A Savchenkov, Andrey B Matsko, D Seidel, L MalekiAbstract:An optical frequency comb demodulated on a photodiode can generate a radio frequency signal with high Spectral Purity at a frequency corresponding to the comb spacing. Here, Liang et al. demonstrate a frequency-comb-based radio frequency photonic oscillator characterized with low phase noise and high frequency stability.
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High Spectral Purity Kerr frequency comb radio frequency photonic oscillator
Nature communications, 2015Co-Authors: Wei Liang, Danny Eliyahu, V S Ilchenko, Anatoliy A Savchenkov, Andrey B Matsko, D Seidel, L MalekiAbstract:Femtosecond laser-based generation of radio frequency signals has produced astonishing improvements in achievable Spectral Purity, one of the basic features characterizing the performance of an radio frequency oscillator. Kerr frequency combs hold promise for transforming these lab-scale oscillators to chip-scale level. In this work we demonstrate a miniature 10 GHz radio frequency photonic oscillator characterized with phase noise better than -60 dBc Hz(-1) at 10 Hz, -90 dBc Hz(-1) at 100 Hz and -170 dBc Hz(-1) at 10 MHz. The frequency stability of this device, as represented by Allan deviation measurements, is at the level of 10(-10) at 1-100 s integration time-orders of magnitude better than existing radio frequency photonic devices of similar size, weight and power consumption.
