N
Nisar Ahmed
Researcher at University of Southern California
Publications - 122
Citations - 10688
Nisar Ahmed is an academic researcher from University of Southern California. The author has contributed to research in topics: Orbital angular momentum multiplexing & Angular momentum. The author has an hindex of 36, co-authored 122 publications receiving 8444 citations. Previous affiliations of Nisar Ahmed include University of Minnesota.
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Journal ArticleDOI
Terabit free-space data transmission employing orbital angular momentum multiplexing
Jian Wang,Jian Wang,Jeng-Yuan Yang,Irfan Fazal,Nisar Ahmed,Yan Yan,Hao Huang,Yongxiong Ren,Yang Yue,S. Dolinar,Moshe Tur,Alan E. Willner +11 more
TL;DR: In this paper, the authors demonstrate the ability to multiplex and transfer data between twisted beams of light with different amounts of orbital angular momentum, which provides new opportunities for increasing the data capacity of free-space optical communications links.
Journal ArticleDOI
Optical communications using orbital angular momentum beams
Alan E. Willner,Hao Huang,Yan Yan,Yongxiong Ren,Nisar Ahmed,Guodong Xie,Changjing Bao,Long Li,Yinwen Cao,Zhe Zhao,Jian Wang,Martin P. J. Lavery,Moshe Tur,Siddharth Ramachandran,Andreas F. Molisch,Nima Ashrafi,Solyman Ashrafi +16 more
TL;DR: In this article, the authors review recent progress in OAM beam generation/detection, multiplexing/demultiplexing, and its potential applications in different scenarios including free-space optical communications, fiber-optic communications, and RF communications.
Journal ArticleDOI
High-capacity millimetre-wave communications with orbital angular momentum multiplexing
Yan Yan,Guodong Xie,Martin P. J. Lavery,Hao Huang,Nisar Ahmed,Changjing Bao,Yongxiong Ren,Yinwen Cao,Long Li,Zhe Zhao,Andreas F. Molisch,Moshe Tur,Miles J. Padgett,Alan E. Willner +13 more
TL;DR: This work demonstrates a 32-Gbit’s−1 millimetre-wave link over 2.5 metres with a spectral efficiency of ~16 bit s− 1 Hz−1 using four independent orbital–angular momentum beams on each of two polarizations, and shows an 8-Gbits−1 link containing two orbital angular momentum beams with crosstalk less than −12.5 dB.
Journal ArticleDOI
100 Tbit/s free-space data link enabled by three-dimensional multiplexing of orbital angular momentum, polarization, and wavelength
Hao Huang,Guodong Xie,Yan Yan,Nisar Ahmed,Yongxiong Ren,Yang Yue,D. Rogawski,Moshe J. Willner,Baris I. Erkmen,Kevin M. Birnbaum,S. Dolinar,Martin P. J. Lavery,Miles J. Padgett,Moshe Tur,Alan E. Willner +14 more
TL;DR: This work demonstrates the multiplexing/demultiplexing of 1008 data channels carried on 12 OAM beams, 2 polarizations, and 42 wavelengths, providing an aggregate capacity of 100.8 Tbit/s.
Journal ArticleDOI
Mode division multiplexing using an orbital angular momentum mode sorter and MIMO-DSP over a graded-index few-mode optical fibre
Hao Huang,Giovanni Milione,Martin P. J. Lavery,Guodong Xie,Yongxiong Ren,Yinwen Cao,Nisar Ahmed,Thien An Nguyen,Daniel A. Nolan,Ming-Jun Li,Moshe Tur,Robert R. Alfano,Alan E. Willner +12 more
TL;DR: It is shown that OAM modes can be (de)multiplexed over a multimode optical fiber with higher than −15 dB mode selectivity and without cascaded beam splitting’s 1/N insertion loss.