The Experts below are selected from a list of 55023 Experts worldwide ranked by ideXlab platform
Jongin Song - One of the best experts on this subject based on the ideXlab platform.
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error free simultaneous all optical upconversion of wdm Radio over fiber Signals
IEEE Photonics Technology Letters, 2005Co-Authors: Hojin Song, Jongin SongAbstract:A simultaneous all-optical upconversion technique for cost-effective wavelength-division-multiplexing (WDM) Radio-over-fiber (RoF) applications utilizing a semiconductor optical amplifier (SOA) Mach-Zehnder interferometer is investigated. The proposed upconversion scheme uses only one Frequency upconverter for multi-RoF channels, thereby reducing the complexity and cost of the system. Error-free simultaneous all-optical upconversion of two WDM intermediate Frequency (IF) channels (155-Mb/s differential phase-shift keying Signal at 2.5 GHz) to an optical Radio Frequency Signal (22.5 GHz) is achieved. In addition, the effect of gain saturation of the SOA due to the increased number of WDM IF channels on bit-error-rates performance is also experimentally investigated.
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error free simultaneous all optical upconversion of wdm Radio over fiber Signals
IEEE Photonics Technology Letters, 2005Co-Authors: Hojin Song, Jeong Seon Lee, Jongin SongAbstract:A simultaneous all-optical upconversion technique for cost-effective wavelength-division-multiplexing (WDM) Radio-over-fiber (RoF) applications utilizing a semiconductor optical amplifier (SOA) Mach-Zehnder interferometer is investigated. The proposed upconversion scheme uses only one Frequency upconverter for multi-RoF channels, thereby reducing the complexity and cost of the system. Error-free simultaneous all-optical upconversion of two WDM intermediate Frequency (IF) channels (155-Mb/s differential phase-shift keying Signal at 2.5 GHz) to an optical Radio Frequency Signal (22.5 GHz) is achieved. In addition, the effect of gain saturation of the SOA due to the increased number of WDM IF channels on bit-error-rates performance is also experimentally investigated.
Ninghua Zhu - One of the best experts on this subject based on the ideXlab platform.
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simultaneous Frequency upconversion and phase coding of a Radio Frequency Signal for photonic radars
Optics Letters, 2018Co-Authors: Sha Zhu, Zhan Shi, Ninghua ZhuAbstract:We report a photonic approach to simultaneously realize Frequency upconversion and phase coding of a Radio-Frequency (RF) Signal based on polarization manipulation of optical Signals. An intermediate Frequency (IF) Signal is upconverted to the local Frequency (LO) band using a dual-polarization dual-parallel Mach-Zehnder modulator, while a high-speed polarization modulator is used to realize high-speed phase coding of the upconverted Signal. The key advantage of the proposed method is that no optical or electrical filters are required to remove the residual IF, LO, and undesired downconverted Signals, which ensures a broad operation bandwidth, excellent isolation, and wide tunability. The proposed scheme is theoretically analyzed and experimentally verified.
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photonics generation of Frequency shift keying Radio Frequency Signal using nonlinear polarization rotation in a highly nonlinear fiber
Optical Engineering, 2016Co-Authors: Xin Wang, Ninghua ZhuAbstract:We experimentally demonstrate an all-optical approach for generating Frequency-shift keying (FSK) Radio-Frequency (RF) Signal based on nonlinear polarization rotation (NPR) in a highly nonlinear fiber (HNLF). A continuous wave probe beam is polarization-rotated by an optical amplitude-shift keying control beam via NPR in the HNLF. After removing the undesired control beam by a tunable optical filter, the polarization-rotated probe beam is converted to an intensity-modulated optical Signal using a polarizer. By carefully adjusting the polarization controller before the polarizer and the optical power of the control beam, FSK RF Signals are generated after photodetection.
Hojin Song - One of the best experts on this subject based on the ideXlab platform.
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error free simultaneous all optical upconversion of wdm Radio over fiber Signals
IEEE Photonics Technology Letters, 2005Co-Authors: Hojin Song, Jongin SongAbstract:A simultaneous all-optical upconversion technique for cost-effective wavelength-division-multiplexing (WDM) Radio-over-fiber (RoF) applications utilizing a semiconductor optical amplifier (SOA) Mach-Zehnder interferometer is investigated. The proposed upconversion scheme uses only one Frequency upconverter for multi-RoF channels, thereby reducing the complexity and cost of the system. Error-free simultaneous all-optical upconversion of two WDM intermediate Frequency (IF) channels (155-Mb/s differential phase-shift keying Signal at 2.5 GHz) to an optical Radio Frequency Signal (22.5 GHz) is achieved. In addition, the effect of gain saturation of the SOA due to the increased number of WDM IF channels on bit-error-rates performance is also experimentally investigated.
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error free simultaneous all optical upconversion of wdm Radio over fiber Signals
IEEE Photonics Technology Letters, 2005Co-Authors: Hojin Song, Jeong Seon Lee, Jongin SongAbstract:A simultaneous all-optical upconversion technique for cost-effective wavelength-division-multiplexing (WDM) Radio-over-fiber (RoF) applications utilizing a semiconductor optical amplifier (SOA) Mach-Zehnder interferometer is investigated. The proposed upconversion scheme uses only one Frequency upconverter for multi-RoF channels, thereby reducing the complexity and cost of the system. Error-free simultaneous all-optical upconversion of two WDM intermediate Frequency (IF) channels (155-Mb/s differential phase-shift keying Signal at 2.5 GHz) to an optical Radio Frequency Signal (22.5 GHz) is achieved. In addition, the effect of gain saturation of the SOA due to the increased number of WDM IF channels on bit-error-rates performance is also experimentally investigated.
Shilong Pan - One of the best experts on this subject based on the ideXlab platform.
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stable fiber delivery of Radio Frequency Signal based on passive phase correction
Optics Letters, 2014Co-Authors: Juan Wei, Fangzheng Zhang, Yonggang Zhou, De Ben, Shilong PanAbstract:A novel passive phase correction method for stable fiber transfer of Radio-Frequency (RF) Signal is proposed and demonstrated. By employing only one local oscillator and two Frequency mixers in the local station, an RF Signal received by an optical remote antenna unit is transmitted to the local station with very small phase jitter. An experiment is performed. When a 6 GHz RF Signal is delivered through a 20 km single-mode fiber, effective cancellation of the RF Signal’s phase jitter induced by environmental perturbations is achieved. The residual jitter is less than 1.33 ps (about 0.05 rad). The proposed scheme requires no active mechanism to compensate the fiber-length fluctuations, and is thus compact, cost-effective, and easy to implement.
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triangular pulse generation using a dual parallel mach zehnder modulator driven by a single Frequency Radio Frequency Signal
Optics Letters, 2013Co-Authors: Fangzheng Zhang, Shilong PanAbstract:A simple scheme for the generation of full-duty-cycle triangular pulses is proposed and experimentally demonstrated using a dual-parallel Mach-Zehnder modulator driven by a single-Frequency RF Signal. By properly setting the bias voltages and the RF power, even-order harmonics in the optical intensity are suppressed, and the amplitude of the first-order harmonic is 9 times of that of the third-order harmonic. A periodical triangular pulse train is obtained in the time domain. 2.5, 5, and 10 GHz triangular pulse trains are experimentally generated, which verifies the feasibility of the proposed scheme.
Malcolm B Gray - One of the best experts on this subject based on the ideXlab platform.
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all digital Radio Frequency Signal distribution via optical fibers
IEEE Photonics Technology Letters, 2012Co-Authors: Magnus T L Hsu, D A Shaddock, R B Warrington, Malcolm B GrayAbstract:We present a Radio-Frequency (RF) Signal distribution system via optical fibers. We utilize an all-digital platform that encompasses a phase-locked loop, numerically-controlled oscillator, and fiber phase noise cancellation system. Our system achieves a fractional Frequency transfer stability of 4 × 10-13 at 1 s and 6 × 10-17 at one day for the distribution of RF Signals over 70 km of optical fiber. We demonstrate that this performance can be achieved with standard crystal oscillators. Our system is scalable, configurable, and flexible, allowing distribution of Signals at different frequencies while maintaining over two orders of magnitude of the fiber phase noise suppression.
