Nisar Ahmed

Selected Publications

Complete list of authored papers is available at my Google Scholar profile.

Book Chapter

        A. E. Willner, Y. Yan, Y. Ren, N. Ahmed, and G. Xie,
        OAM–based Wireless Communications: Designs and Implementations
        Signal Processing for 5G: Algorithms and Implementations,
        John Wiley & Sons, Ltd, Chichester, UK. (2016): 296-318.

Invited

  1. A. E. Willner, G. Xie, L. Li, Y. Ren, Y. Yan, N. Ahmed et al.,
    Design challenges and guidelines for free-space optical communication links using OAM multiplexing of multiple beams
    Journal of Optics, 2016.
    (selected by Editors as “Highlight of 2016”)

  2. Z. Zhao, R. Yongxiong G. Xie, L. Li, Y. Yan, N. Ahmed et al.,
    Division and multiplication of the state order for data-carrying OAM beams
    APL Photonics, 2017.

  3. A. E. Willner, H. Huang, Y. Yan, Y. Ren, N. Ahmed et al.,
    Optical communications using orbital angular momentum beams
    Advances in Optics & Photonics, 2015.

  4. A. E. Willner, H. Huang, N. Ahmed , Y. Yue, M. J. Willner,
    Data Switching in Communication Networks using OAM Multiplexing,
    Advanced Photonics for Communications, San Diego CA, 2014.

  5. A. E. Willner, Y. Ren, H. Huang, Y. Yan, N. Ahmed et al.,
    Optical Communications using Multiplexing of Multiple OAM Beams
    IEEE Photonics Society Newsletter, 2014.

  6. Y. Ren, H. Huang, G. Xie, N. Ahmed, B. Erkmen et al.,
    Experimental Turbulence Effects on Crosstalk and System Power Penalty over a Free Space Optical Communication link using Orbital Angular Momentum Multiplexing,
    Conference on Lasers and Electro-Optics (CLEO), San Jose CA, 2013.

Journals

  1. N. Ahmed, Z. Zhao, L. Li, H. Huang, M. PJ. Lavery, P. Liao et al.,
    Mode-Division-Multiplexing of multiple Bessel-Gaussian beams carrying OAM for obstruction-tolerant free-Space optical and mm-wave communication links
    Scientific Reports, 6 (2016).

  2. N. Ahmed, H. Huang, Y. Ren, Y. Yan, G. Xie, M. Tur, and A. E. Willner,
    Reconfigurable 2 x 2 OAM based optical switching of 50-Gbaud QPSK channels
    Optics Express, 22 2014.

  3. N. Ahmed and M. I. Hayee,
    Electronic compensation of optical fiber nonlinearity for intensity and phase modulated WDM transmission systems
    Recent Patents on Signal Processing 1, (2011).

  4. N. Ahmed, M. I. Hayee, and Q. Zhang,
    Electronic postcompensation of fiber nonlinearity for 40 Gbit/s WDM systems
    IEEE/OSA J. Optical Communications & Networking, 2, (2010).

  5. J. Wang, J.-Y. Yang, I. M. Fazal, N. Ahmed, Y. Yan et al.,
    Terabit free–space data transmission employing OAM multiplexing
    Nature Photonics, 6 (2012).

  6. Y. Yan, G. Xie, M. P. Lavery, H. Huang, N. Ahmed et al.,
    High-capacity millimetre-wave communications with OAM multiplexing
    Nature Communications, 5 (2014).

  7. I. Fazal, N. Ahmed, J. Wang, J.-Y. Yang, Y. Yan et al.,
    2  Tbit/s Free-space Data Transmission on Two Orthogonal OAM beams each carrying 25 WDM Channels
    Optics Letters, 37 (2012).

  8. A. Bogoni, X. Wu, S. R. Nuccio, N. Ahmed, and A. E. Willner,
    160 Gbit/s binary-to-quaternary amplitude shift keying encoding in the optical domain,
    Optics Letters, 36 (2011).

  9. S. Khaleghi, O. F. Yilmaz, M. R. Chitgarha, M. Tur, N. Ahmed, S. R. Nuccio, I. M. Fazal, X. Wu, M. W. Haney, C. Langrock, M. M. Fejer, and Alan E. Willner,
    High–speed correlation and equalization using a continuously tunable all-optical tapped delay line,
    IEEE Photonics Journal, 4 (2012).

Conferences

  1. N. Ahmed, Zhe Zhao, Yan Yan, Peicheng Liao, Guodong Xie, et al.,
    Demonstration of an obstruction-tolerant millimeter-wave free-space communications link of two 1-Gbaud 16-QAM channels using Bessel beams containing OAM,
    SPIE 3rd International Conference on OAM (ICOAM), 2015.

  2. N. Ahmed, M. P. Lavery, P. liao, G. Xie, H. Huang, et al.,
    Demonstration of Distance Emulation for an OAM Beam
    Conference on Lasers and Electro-Optics (CLEO), 2015

  3. N. Ahmed, M. P. Lavery, H. Huang, G. Xie, Y. Ren, Y. Yan, and A. E. Willner,
    Experimental demonstration of obstruction-tolerant free-space transmission of two 50-Gbaud QPSK data channels using bessel beams carrying optical-angular-momentum,
    European Conference on Optical Communication (ECOC), 2014.

  4. N. Ahmed, G. Xie, Y. Ren, L. Li, H. Huang, Y. Yan, and A. Willner,
    Experimental demonstration of an apodized aperture for receiving a data–carrying OAM beam
    Conference on Lasers and Electro-Optics (CLEO), 2014.

  5. N. Ahmed, H. Huang, Y. Yue, Y. Yan, Y. Ren, and A. E. Willner,
    Demonstration of add/drop multiplexer for 100-Gbit/s RZ-QPSK channels over spatially multiplexed orbital OAM,
    IEEE Photonics Conference (IPC), 2012.

  6. N. Ahmed, and M. I. Hayee,
    Electronic post-compensation of fiber nonlinearity for 40 Gb/s RZ-DPSK WDM transmission systems,
    23rd Annual Meeting of the IEEE Photonics Society, 2010.

  7. N. Ahmed, and M. I. Hayee,
    Electronic compensation of fiber nonlinearity for 40 Gb/s WDM transmission systems,
    IEEE LEOS Annual Meeting Conference (LEOS’09), 2009.

  8. N. Ahmed, and M. I. Hayee,
    Electronic compensation of optical fiber nonlinearity in on-off keyed 40 Gb/s WDM transmission systems,
    OSA Frontiers in Optics (FiO’09), 2009.

  9. O. Yilmaz, S. Khaleghi, N. Ahmed, S. Nuccio, I. Fazal, X. Wu, and A. Willner,
    Reconfigurable and finely tunable optical tapped delay line to achieve 40 Gb/s equalization and correlation using conversion/dispersion based delays,
    ECOC 2010.

  10. A. Bogoni, X. Wu, S. R. Nuccio, N. Ahmed, and A. Willner,
    160 Gb/s all–optical binary–to– quaternary amplitude shift keying format conversion,
    OFC 2011.