The Experts below are selected from a list of 3336 Experts worldwide ranked by ideXlab platform
Lin Chen - One of the best experts on this subject based on the ideXlab platform.
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polarization insensitive wavelength division multiplexing optical millimeter wave generation based on copolarized pump four wave mixing in a semiconductor optical amplifier
Applied Optics, 2009Co-Authors: Zhiwei Zheng, Lin Chen, Shuangchun Wen, Dianyuan FanAbstract:We proposed a novel scheme to generate polarization-insensitive optical millimeter-wave (mm-wave) wavelength-division-multiplexing (WDM) signals by using an External Modulator and a semiconductor optical amplifier (SOA). In the scheme, two copolarized pumps and a WDM signal are mixed in the SOA based on four wave mixing (FWM), and the quadruple frequency mm-wave signal, similar to the single-sideband mm-wave signal, is obtained by using an optical filter to remove one sideband after FWM. Based on the scheme, we have experimentally demonstrated the generation of a two-channel 2.5 Gbit/s WDM optical mm-wave signal with a repetitive frequency up to 40 GHz by a 10 GHz local oscillator, and the downstream signal delivery over a 20 km fiber with power penalty less than 1 dB.
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optical front ends to generate optical millimeter wave signal in radio over fiber systems with different architectures
Journal of Lightwave Technology, 2007Co-Authors: Lin Chen, Shuangchun Wen, Hong Wen, Yufeng Shao, Ze DongAbstract:We have proposed and experimentally demonstrated three different optical front-ends to implement in wavelength-division-multiplexing (WDM) radio-over-fiber (ROF) networks to minimize the cost of the ROF system. When the number of WDM channels is small, such as smaller than four channels, the simplest front-end to generate WDM optical millimeter (mm)-wave signals is to use only broadband direct-modulation laser (DML) for each WDM channel. In this case, the expensive External Modulator can be removed. However, when the number of WDM channels is large, such as larger than four, the frond-end to generate WDM optical mm-wave signals can be realized by using an External Modulator to upconvert simultaneously all channels after the WDM channel signals are multiplexed. In this way, the cost of the expensive External Modulator will be shared by all channels. For seamless integration of WDM signals that come from the existing backbone with ROF system, a broadband External Modulator can be used to upconvert WDM signals.
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all optical mm wave generation by using direct modulation dfb laser and External Modulator
Microwave and Optical Technology Letters, 2007Co-Authors: Lin Chen, Hong Wen, Shuangchun WenAbstract:We proposed and experimentally demonstrated a novel method of optical mm-wave generation using only one Mach-Zehnder Modulator and a direct-Modulator, based on the method of optical carrier suppression. Using this proposed method, the 2.5 Gb/s data channel was successfully transmitted over 20 km for downstream with less than 1-dB power penalty. Therefore, the system configure of mm-wave generation can be further simplified and be more cost effective. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1265–1267, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22449
Shuangchun Wen - One of the best experts on this subject based on the ideXlab platform.
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polarization insensitive wavelength division multiplexing optical millimeter wave generation based on copolarized pump four wave mixing in a semiconductor optical amplifier
Applied Optics, 2009Co-Authors: Zhiwei Zheng, Lin Chen, Shuangchun Wen, Dianyuan FanAbstract:We proposed a novel scheme to generate polarization-insensitive optical millimeter-wave (mm-wave) wavelength-division-multiplexing (WDM) signals by using an External Modulator and a semiconductor optical amplifier (SOA). In the scheme, two copolarized pumps and a WDM signal are mixed in the SOA based on four wave mixing (FWM), and the quadruple frequency mm-wave signal, similar to the single-sideband mm-wave signal, is obtained by using an optical filter to remove one sideband after FWM. Based on the scheme, we have experimentally demonstrated the generation of a two-channel 2.5 Gbit/s WDM optical mm-wave signal with a repetitive frequency up to 40 GHz by a 10 GHz local oscillator, and the downstream signal delivery over a 20 km fiber with power penalty less than 1 dB.
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optical front ends to generate optical millimeter wave signal in radio over fiber systems with different architectures
Journal of Lightwave Technology, 2007Co-Authors: Lin Chen, Shuangchun Wen, Hong Wen, Yufeng Shao, Ze DongAbstract:We have proposed and experimentally demonstrated three different optical front-ends to implement in wavelength-division-multiplexing (WDM) radio-over-fiber (ROF) networks to minimize the cost of the ROF system. When the number of WDM channels is small, such as smaller than four channels, the simplest front-end to generate WDM optical millimeter (mm)-wave signals is to use only broadband direct-modulation laser (DML) for each WDM channel. In this case, the expensive External Modulator can be removed. However, when the number of WDM channels is large, such as larger than four, the frond-end to generate WDM optical mm-wave signals can be realized by using an External Modulator to upconvert simultaneously all channels after the WDM channel signals are multiplexed. In this way, the cost of the expensive External Modulator will be shared by all channels. For seamless integration of WDM signals that come from the existing backbone with ROF system, a broadband External Modulator can be used to upconvert WDM signals.
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all optical mm wave generation by using direct modulation dfb laser and External Modulator
Microwave and Optical Technology Letters, 2007Co-Authors: Lin Chen, Hong Wen, Shuangchun WenAbstract:We proposed and experimentally demonstrated a novel method of optical mm-wave generation using only one Mach-Zehnder Modulator and a direct-Modulator, based on the method of optical carrier suppression. Using this proposed method, the 2.5 Gb/s data channel was successfully transmitted over 20 km for downstream with less than 1-dB power penalty. Therefore, the system configure of mm-wave generation can be further simplified and be more cost effective. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1265–1267, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22449
Li Che - One of the best experts on this subject based on the ideXlab platform.
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a radio over fiber system with a novel scheme for millimeter wave generation and wavelength reuse for up link connection
IEEE Photonics Technology Letters, 2006Co-Authors: Li CheAbstract:We proposed and experimentally demonstrated a novel scheme to generate an optical millimeter-wave and realized wavelength reuse for uplink connection in a radio-over-fiber system. We employed an optical interleaver to separate the spectrum of the double-sideband signals generated by a single-arm intensity External Modulator. The separated first-order sideband modes were used to generate optical millimeter-wave with double RF frequency, while the separated optical carrier was reused for uplink connection
C Belisle - One of the best experts on this subject based on the ideXlab platform.
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phase noise analysis of optically generated millimeter wave signals with External optical modulation techniques
Journal of Lightwave Technology, 2006Co-Authors: Jianping Yao, Joe Seregelyi, Stephane Paquet, C Belisle, Xiupu Zhang, Raman KashyapAbstract:In this paper, the phase-noise performance of optically generated electrical signals based on External optical modulation techniques is investigated theoretically and experimentally. Mathematical models are developed to represent perturbations on the transmitted optical signal caused by the phase fluctuations of the electrical drive signal applied to the External Modulator and the optical carrier that feeds the External Modulator. Closed-form expressions of the power spectral density (PSD) for the electrical signals, generated both locally and remotely, are derived. The calculated PSD of the locally generated electrical signal indicates that its phase noise is determined only by the phase noise of the electrical drive signal. The PSD of the remotely generated signal shows that its spectral quality is also affected by the chromatic dispersion of the fiber and the optical carrier linewidth. An experimental setup that can generate a millimeter-wave (mm-wave) signal, continuously tunable from 32 to 60 GHz using an electrical drive signal tunable from 8 to 15 GHz, is built. The spectra of the generated millimeter-wave signal are measured for both locally and remotely generated electrical signals, with optical carriers of different linewidths. The theoretical results agree with the experimental measurements
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generation and distribution of a wide band continuously tunable millimeter wave signal with an optical External modulation technique
IEEE Transactions on Microwave Theory and Techniques, 2005Co-Authors: Guohua Qi, Jianping Yao, Joe Seregelyi, Stephane Paquet, C BelisleAbstract:A new technique to generate and distribute a wide-band continuously tunable millimeter-wave signal using an optical External Modulator and a wavelength-fixed optical notch filter is proposed. The optical intensity Modulator is biased to suppress the odd-order optical sidebands. The wavelength-fixed optical notch filter is then used to filter out the optical carrier. Two second-order optical sidebands are obtained at the output of the notch filter. A millimeter-wave signal that has four times the frequency of the microwave drive signal is generated by beating the two second-order optical sidebands at a photodetector. Since no tunable optical filter is used, the system is easy to implement. A system using an LiNbO/sub 3/ intensity Modulator and a fiber Bragg grating filter is built. A stable and high spectral purity millimeter-wave signal tunable from 32 to 50 GHz is obtained by tuning the microwave drive signal from 8 to 12.5 GHz. The integrity of the generated millimeter-wave signal is maintained after transmission over a 25-km standard single-mode fiber. Theoretical analysis on the harmonic suppression with different modulation depths and filter attenuations is also discussed.
Hong Wen - One of the best experts on this subject based on the ideXlab platform.
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optical front ends to generate optical millimeter wave signal in radio over fiber systems with different architectures
Journal of Lightwave Technology, 2007Co-Authors: Lin Chen, Shuangchun Wen, Hong Wen, Yufeng Shao, Ze DongAbstract:We have proposed and experimentally demonstrated three different optical front-ends to implement in wavelength-division-multiplexing (WDM) radio-over-fiber (ROF) networks to minimize the cost of the ROF system. When the number of WDM channels is small, such as smaller than four channels, the simplest front-end to generate WDM optical millimeter (mm)-wave signals is to use only broadband direct-modulation laser (DML) for each WDM channel. In this case, the expensive External Modulator can be removed. However, when the number of WDM channels is large, such as larger than four, the frond-end to generate WDM optical mm-wave signals can be realized by using an External Modulator to upconvert simultaneously all channels after the WDM channel signals are multiplexed. In this way, the cost of the expensive External Modulator will be shared by all channels. For seamless integration of WDM signals that come from the existing backbone with ROF system, a broadband External Modulator can be used to upconvert WDM signals.
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all optical mm wave generation by using direct modulation dfb laser and External Modulator
Microwave and Optical Technology Letters, 2007Co-Authors: Lin Chen, Hong Wen, Shuangchun WenAbstract:We proposed and experimentally demonstrated a novel method of optical mm-wave generation using only one Mach-Zehnder Modulator and a direct-Modulator, based on the method of optical carrier suppression. Using this proposed method, the 2.5 Gb/s data channel was successfully transmitted over 20 km for downstream with less than 1-dB power penalty. Therefore, the system configure of mm-wave generation can be further simplified and be more cost effective. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1265–1267, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22449
