The Experts below are selected from a list of 19893 Experts worldwide ranked by ideXlab platform

Jiangnan Xiao - One of the best experts on this subject based on the ideXlab platform.

  • w band vector millimeter wave signal generation based on Phase Modulator with photonic frequency quadrupling and precoding
    Journal of Lightwave Technology, 2017
    Co-Authors: Jiangnan Xiao
    Abstract:

    We experimentally demonstrate W-band vector millimeter-wave (mm-wave) signal generation and its air space transmission, from constant-modulus quadrature Phase shift keying modulation to multimodulus 8-ary quadrature amplitude modulation/16-ary quadrature amplitude modulation (8QAM/16QAM) modulation, employing a photonic frequency-quadrupling scheme enabled by a single Phase Modulator and precoding technique. As far as we know, it is the first time to realize W-band 8QAM/16QAM vector mm-wave signal generation based on a single Phase Modulator with photonic frequency multiplication. We also investigate by numerical simulation and experiment the effect of the radio-frequency (RF) driving peak-to-peak voltage of the Phase Modulator on the performance of the generated vector mm-wave signal, and find that there exists an optimal RF driving peak-to-peak voltage for the best performance of the generated vector mm-wave signal, which agrees well with our theoretical analysis.

  • w band millimeter wave vector signal generation based on precoding assisted random photonic frequency tripling scheme enabled by Phase Modulator
    IEEE Photonics Journal, 2016
    Co-Authors: Xinying Li, Jiangnan Xiao, Yuming Xu, Jianjun Yu
    Abstract:

    We propose W-band photonic millimeter-wave (mm-wave) vector signal generation employing a precoding-assisted random frequency tripling scheme enabled by a single Phase Modulator cascaded with a wavelength selective switch (WSS). The selected two optical subcarriers from the Phase Modulator output by the WSS can have several different kinds of combinations with asymmetrical orders, such as (-3, 0), (-2, 1), (-1, 2), and (0, 3). Employing our proposed precoding-assisted random frequency tripling scheme, we experimentally demonstrate 1/2-Gbd 81-GHz quadrature-Phase-shift-keying (QPSK) mm-wave vector signal generation and its wireless delivery over 0.5-m air space distance. We also experimentally demonstrate that the generated mm-wave vector signal based on the minus second-order (-2nd) and first-order (1st) subcarriers, which is equivalent to that based on the minus first-order (-1st) and second-order (2nd) subcarriers, has a better bit-error-ratio (BER) performance than that based on the minus third-order (-3rd) and central (0th) subcarriers, which is equivalent to that based on the 0th and third-order (-3rd) subcarriers, when the Phase Modulator has a relatively small driving radio-frequency (RF) voltage, whereas an opposite result occurs when the Phase Modulator has a relatively large driving RF voltage, which is consistent with both our theoretical analysis and numerical simulation.

  • w band millimeter wave vector signal generation based on precoding assisted random photonic frequency tripling scheme enabled by Phase Modulator
    IEEE Photonics Journal, 2016
    Co-Authors: Jiangnan Xiao
    Abstract:

    We propose W-band photonic millimeter-wave (mm-wave) vector signal generation employing a precoding-assisted random frequency tripling scheme enabled by a single Phase Modulator cascaded with a wavelength selective switch (WSS). The selected two optical subcarriers from the Phase Modulator output by the WSS can have several different kinds of combinations with asymmetrical orders, such as (-3, 0), (-2, 1), (-1, 2), and (0, 3). Employing our proposed precoding-assisted random frequency tripling scheme, we experimentally demonstrate 1/2-Gbd 81-GHz quadrature-Phase-shift-keying (QPSK) mm-wave vector signal generation and its wireless delivery over 0.5-m air space distance. We also experimentally demonstrate that the generated mm-wave vector signal based on the minus second-order (-2nd) and first-order (1st) subcarriers, which is equivalent to that based on the minus first-order (-1st) and second-order (2nd) subcarriers, has a better bit-error-ratio (BER) performance than that based on the minus third-order (-3rd) and central (0th) subcarriers, which is equivalent to that based on the 0th and third-order (-3rd) subcarriers, when the Phase Modulator has a relatively small driving radio-frequency (RF) voltage, whereas an opposite result occurs when the Phase Modulator has a relatively large driving RF voltage, which is consistent with both our theoretical analysis and numerical simulation.

  • high frequency photonic vector signal generation employing a single Phase Modulator
    IEEE Photonics Journal, 2015
    Co-Authors: Jiangnan Xiao, Ziran Zhang, Long Chen
    Abstract:

    In this paper, we propose a novel and simple method to generate millimeter-wave vector signals using only one Phase Modulator (PM) and Phase-precoding technique, in which the precoded microwave vector signal is used for the drive of the single PM. We experimentally demonstrate that this concept of the generation of quadrature-Phase-shift-keying-modulated vector signal can be employed in our radio-over-fiber (RoF) system architecture based on our proposed scheme. By this scheme, we simplify the configuration and reduce the cost of the RoF system.

Jianping Yao - One of the best experts on this subject based on the ideXlab platform.

  • microwave photonic filter with two independently tunable passbands using a Phase Modulator and an equivalent Phase shifted fiber bragg grating
    IEEE Transactions on Microwave Theory and Techniques, 2014
    Co-Authors: Liang Gao, Jiejun Zhang, Xiangfei Chen, Jianping Yao
    Abstract:

    A dual-passband microwave photonic filter (MPF) implemented based on Phase-modulation to intensity-modulation (PM-IM) conversion using a Phase Modulator and an equivalent Phase-shifted fiber Bragg grating (EPS-FBG) is proposed and experimentally demonstrated. The key component in the system is the EPS-FBG, which is designed and fabricated based on the equivalent Phase-shift technique. The unique feature of the EPS-FBG is that equivalent Phase shifts are introduced to both of the ±1st channels, leading to a notch in each of the two channels. Thus, by implementing PM-IM conversion in the two channels, two passbands are produced. The central frequency of each passband is determined by the wavelength different between the notch and the optical carrier. In the design and fabrication, two Phase shifts are introduced to the EPS-FBG to decrease the shape factor, which is defined as the ratio between the 20- and 3-dB bandwidths. In addition, a stimulated Brillouin scattering (SBS) assisted filter is incorporated in the system for carrier suppression to increase the spurious-free dynamic range (SFDR) and decrease the noise figure (NF) of the MPF. An experiment is performed. A dual passband filter with a 3-dB bandwidth and a shape factor of 167.3 MHz and 3.8, and 143.3 MHz and 3.3 for the 1st and 2nd passband is achieved. The frequency tunable ranges of the 1st and 2nd passbands are 5.4 and 7.4 GHz, respectively, with the magnitude variations of about ±0.5 dB during the turning. Due to the SBS-assisted filter, the SFDRs are increased by 7 dB and the NFs are decreased by 10 dB.

  • instantaneous microwave frequency measurement using an optical Phase Modulator
    IEEE Microwave and Wireless Components Letters, 2009
    Co-Authors: Xiaomi Zhang, Shilie Zheng, Hao Chi, Xianmi Zhang, Jianping Yao
    Abstract:

    A novel technique for instantaneous microwave frequency measurement using an optical Phase Modulator is proposed and demonstrated. In the proposed system, a microwave signal with its frequency to be measured is modulated on two optical wavelengths at the Phase Modulator, with the Phase-modulated optical signals sent to a dispersive element, and detected at two photo-detectors. Due to the chromatic dispersion of the dispersive element, the two microwave signals will experience different power fading, leading to different power versus frequency functions. A fixed relationship between the microwave frequency and the microwave powers is established. By measuring the microwave powers, the microwave frequency is estimated. Compared with the techniques using an intensity Modulator, the proposed approach is simpler with less loss. Since no bias is needed the system has a better stability, which is highly expected for defense applications. Experimental verification is presented.

  • switchable uwb pulse generation using a Phase Modulator and a reconfigurable asymmetric mach zehnder interferometer
    Optics Letters, 2009
    Co-Authors: Shilong Pan, Jianping Yao
    Abstract:

    We propose a new scheme to generate polarity-switchable ultrawideband (UWB) Gaussian pulses in the optical domain by use of a Phase Modulator and a reconfigurable asymmetric Mach-Zehnder interferometer (AMZI). In the proposed system, an optical carrier is Phase modulated by a Gaussian pulse train and then sent to a first-or second-order AMZI. The system is equivalent to a first- or second-order differentiator for the production of Gaussian UWB monocycle or doublet pulses. The polarity of the generated UWB pulses can be switched by adjusting the Phase difference between the two interference components in the AMZI. An experiment is performed. Gaussian monocycle and doublet pulses with fractional bandwidths of about 177% and 140% are generated. The polarity switchability of generated UWB pulses is also experimentally confirmed.

  • tunable photonic microwave bandpass filter with negative coefficients implemented using an optical Phase Modulator and chirped fiber bragg gratings
    Journal of Lightwave Technology, 2007
    Co-Authors: Yu Yan, Sebastien Blais, Jianping Yao
    Abstract:

    A continuously tunable photonic microwave bandpass filter with positive and negative coefficients implemented using an optical Phase Modulator and chirped fiber Bragg gratings (FBGs) is proposed and experimentally demonstrated. The positive and negative coefficients are generated through optical Phase-modulation to intensity-modulation conversion by reflecting the Phase-modulated optical carrier from linearly chirped FBGs (LCFBGs) with positive and negative dispersions. The tunability of the filter is realized by changing the wavelength of the optical carrier such that it is reflected at different physical locations in the LCFBGs. A two-tap microwave bandpass filter with a free spectral range tunable from 1.14 to 4.55 GHz is experimentally demonstrated.

  • ultrawideband impulse radio signal generation using a high speed electrooptic Phase Modulator and a fiber bragg grating based frequency discriminator
    IEEE Photonics Technology Letters, 2006
    Co-Authors: Fei Zeng, Jianping Yao
    Abstract:

    We propose a novel approach to generating ultrawideband impulse radio signals in the optical domain. The proposed system consists of a laser source, an electrooptic Phase Modulator (EOPM), a fiber Bragg grating (FBG), and a photodetector (PD). The light source is Phase modulated by an electrical Gaussian pulse train via the EOPM. The optical Phase modulation to intensity modulation conversion is achieved by reflecting the Phase modulated light at the slopes of the FBG that serves as a frequency discriminator. Electrical monocycle or doublet pulses are obtained at the output of the PD by locating the wavelength of the optical carrier at the linear or the quadrature slopes of the FBG reflection spectrum. The use of the proposed configuration to implement pulse polarity and pulse shape modulation in the optical domain is discussed. Experimental measurements in both temporal and frequency domains are presented

Naoya Wada - One of the best experts on this subject based on the ideXlab platform.

  • rapid reconfigurable ocdma system using single Phase Modulator for time domain spectral Phase encoding decoding and dpsk data modulation
    Journal of Lightwave Technology, 2011
    Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada
    Abstract:

    An optical-code-division-multiple-access (OCDMA) system with a novel modulation scheme for simultaneous generation of time-domain spectral Phase encoding/decoding (SPE/SPD) and differential Phase-shift keying (DPSK) data modulation that can be potentially rapidly reconfigured using only a single-Phase Modulator (PM) is proposed and experimentally demonstrated. The time-domain SPE is realized by stretching and compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with opposite dispersion and a high-speed PM for optical code (OC) generation and data modulation. The SPD has similar configuration as the SPE counterpart but using another PM synchronously driven by the complementary code pattern for OC recognition. Simulation investigation and experimental results both show that the code transition, dispersion mismatch between the encoding and decoding side, and the transmission fiber dispersion have detrimental effect on the en/decoding performance. In the experiment, 16-chip, 40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously generated using a single PM. The 2.5-Gb/s DPSK data have been successfully decoded and transmitted over 34 km fiber with BER <; 10-9 for five OCs. The proposed scheme employs similar setup for transmitter and receiver, exhibiting the potential to simplify the architecture of the whole system, and improve the flexibility and confidentiality of OCDMA system.

  • time domain spectral Phase encoding dpsk data modulation using single Phase Modulator for ocdma application
    Optics Express, 2010
    Co-Authors: Xu Wang, Zhensen Gao, Nobuyuki Kataoka, Naoya Wada
    Abstract:

    A novel scheme using single Phase Modulator for simultaneous time domain spectral Phase encoding (SPE) signal generation and DPSK data modulation is proposed and experimentally demonstrated. Array- Waveguide-Grating and Variable-Bandwidth-Spectrum-Shaper based devices can be used for decoding the signal directly in spectral domain. The effects of fiber dispersion, light pulse width and timing error on the coding performance have been investigated by simulation and verified in experiment. In the experiment, SPE signal with 8-chip, 20GHz/chip optical code patterns has been generated and modulated with 2.5 Gbps DPSK data using single Modulator. Transmission of the 2.5 Gbps data over 34km fiber with BER<10−9 has been demonstrated successfully. The proposed scheme has simple configuration and improved flexibility that can significantly improve the data confidentiality for optical code division multiple access (OCDMA) and secure optical communication applications.

  • demonstration of time domain spectral Phase encoding dpsk data modulation using single Phase Modulator
    Lasers and Electro-Optics Society Meeting, 2009
    Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada
    Abstract:

    We proposed and experimentally demonstrated time-domain spectral Phase encoding scheme using single Phase Modulator for 8-chip, 20GHz/chip optical code generation and 2.5 Gbps DPSK data modulation, and successfully transmitted and decoded the data with BER≪10−9

Jianjun Yu - One of the best experts on this subject based on the ideXlab platform.

  • w band millimeter wave vector signal generation based on precoding assisted random photonic frequency tripling scheme enabled by Phase Modulator
    IEEE Photonics Journal, 2016
    Co-Authors: Xinying Li, Jiangnan Xiao, Yuming Xu, Jianjun Yu
    Abstract:

    We propose W-band photonic millimeter-wave (mm-wave) vector signal generation employing a precoding-assisted random frequency tripling scheme enabled by a single Phase Modulator cascaded with a wavelength selective switch (WSS). The selected two optical subcarriers from the Phase Modulator output by the WSS can have several different kinds of combinations with asymmetrical orders, such as (-3, 0), (-2, 1), (-1, 2), and (0, 3). Employing our proposed precoding-assisted random frequency tripling scheme, we experimentally demonstrate 1/2-Gbd 81-GHz quadrature-Phase-shift-keying (QPSK) mm-wave vector signal generation and its wireless delivery over 0.5-m air space distance. We also experimentally demonstrate that the generated mm-wave vector signal based on the minus second-order (-2nd) and first-order (1st) subcarriers, which is equivalent to that based on the minus first-order (-1st) and second-order (2nd) subcarriers, has a better bit-error-ratio (BER) performance than that based on the minus third-order (-3rd) and central (0th) subcarriers, which is equivalent to that based on the 0th and third-order (-3rd) subcarriers, when the Phase Modulator has a relatively small driving radio-frequency (RF) voltage, whereas an opposite result occurs when the Phase Modulator has a relatively large driving RF voltage, which is consistent with both our theoretical analysis and numerical simulation.

  • A novel radio-over-fiber configuration using optical Phase Modulator to generate an optical mm-wave and centralized lightwave for uplink connection
    IEEE Photonics Technology Letters, 2007
    Co-Authors: Jianjun Yu, Zhensheng Jia, Ting Wang, Gee-kung Chang
    Abstract:

    We have designed a novel radio-over-fiber configuration using an optical Phase Modulator along with optical filtering to generate an optical millimeter-wave for carrying downstream data and centralized lightwave for carrying upstream data. Since the remaining optical carrier with high power has been reused, the optical power is effectively utilized; therefore, the system cost can be reduced. We have calculated the power margin, and found that the margin is large even if no boosted erbium-doped fiber amplifier is used in the system. The eye diagrams and bit-error-rate performance at the receivers have been evaluated

  • dwdm optical millimeter wave generation for radio over fiber using an optical Phase Modulator and an optical interleaver
    IEEE Photonics Technology Letters, 2006
    Co-Authors: Jianjun Yu, Ting Wang, Lei Xu, Lin Chen, Gee-kung Chang
    Abstract:

    We have proposed and experimentally demonstrated a novel scheme to generate a dense wavelength-division multiplexing (DWDM) optical millimeter-wave source by using an optical Phase Modulator and an optical interleaver. The stability of the DWDM optical millimeter wave generation is largely improved because we use an optical Phase Modulator without a dc-bias controller and an optical interleaver is subsequently employed to suppress the optical carrier of the DWDM source, which is not as temperature sensitive as a fiber Bragg grating. Moreover, the limitation of chromatic dispersion is greatly reduced due to avoiding the generation of higher order sidebands via driving the Phase Modulator with optimized RF signal

Zhensen Gao - One of the best experts on this subject based on the ideXlab platform.

  • rapid reconfigurable ocdma system using single Phase Modulator for time domain spectral Phase encoding decoding and dpsk data modulation
    Journal of Lightwave Technology, 2011
    Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada
    Abstract:

    An optical-code-division-multiple-access (OCDMA) system with a novel modulation scheme for simultaneous generation of time-domain spectral Phase encoding/decoding (SPE/SPD) and differential Phase-shift keying (DPSK) data modulation that can be potentially rapidly reconfigured using only a single-Phase Modulator (PM) is proposed and experimentally demonstrated. The time-domain SPE is realized by stretching and compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with opposite dispersion and a high-speed PM for optical code (OC) generation and data modulation. The SPD has similar configuration as the SPE counterpart but using another PM synchronously driven by the complementary code pattern for OC recognition. Simulation investigation and experimental results both show that the code transition, dispersion mismatch between the encoding and decoding side, and the transmission fiber dispersion have detrimental effect on the en/decoding performance. In the experiment, 16-chip, 40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously generated using a single PM. The 2.5-Gb/s DPSK data have been successfully decoded and transmitted over 34 km fiber with BER <; 10-9 for five OCs. The proposed scheme employs similar setup for transmitter and receiver, exhibiting the potential to simplify the architecture of the whole system, and improve the flexibility and confidentiality of OCDMA system.

  • time domain spectral Phase encoding dpsk data modulation using single Phase Modulator for ocdma application
    Optics Express, 2010
    Co-Authors: Xu Wang, Zhensen Gao, Nobuyuki Kataoka, Naoya Wada
    Abstract:

    A novel scheme using single Phase Modulator for simultaneous time domain spectral Phase encoding (SPE) signal generation and DPSK data modulation is proposed and experimentally demonstrated. Array- Waveguide-Grating and Variable-Bandwidth-Spectrum-Shaper based devices can be used for decoding the signal directly in spectral domain. The effects of fiber dispersion, light pulse width and timing error on the coding performance have been investigated by simulation and verified in experiment. In the experiment, SPE signal with 8-chip, 20GHz/chip optical code patterns has been generated and modulated with 2.5 Gbps DPSK data using single Modulator. Transmission of the 2.5 Gbps data over 34km fiber with BER<10−9 has been demonstrated successfully. The proposed scheme has simple configuration and improved flexibility that can significantly improve the data confidentiality for optical code division multiple access (OCDMA) and secure optical communication applications.

  • demonstration of time domain spectral Phase encoding dpsk data modulation using single Phase Modulator
    Lasers and Electro-Optics Society Meeting, 2009
    Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada
    Abstract:

    We proposed and experimentally demonstrated time-domain spectral Phase encoding scheme using single Phase Modulator for 8-chip, 20GHz/chip optical code generation and 2.5 Gbps DPSK data modulation, and successfully transmitted and decoded the data with BER≪10−9