Results 61 to 70 of about 108,903 (186)

Advanced DSP for Coherent Optical Fiber Communication [PDF]

Applied Sciences, 2019
In this paper, we provide an overview of recent progress on advanced digital signal processing (DSP) techniques for high-capacity long-haul coherent optical fiber transmission systems. Not only the linear impairments existing in optical transmission links need to be compensated, but also, the nonlinear impairments require proper algorithms for ...
Jian Zhao, Yaping Liu, Tianhua Xu
openaire   +3 more sources

Adaptive Compensation of Bandwidth Narrowing Effect for Coherent In-Phase Quadrature Transponder through Finite Impulse Response Filter

Applied Sciences, 2019
Coherent in-phase quadrature (IQ) transponders are ubiquitous in the long-haul and the metro optical networks. During the transmission, the coherent signal experiences a bandwidth narrowing effect after passing through multiple reconfigurable optical add-
Qiang Wang, Yang Yue, Jian Yao, Jon Anderson   +3 more
doaj   +1 more source

Blind adaptive equalization of polarization-switched QPSK modulation [PDF]

, 2011
Coherent detection in combination with digital signal processing has recently enabled significant progress in the capacity of optical communications systems.
Millar, DS, Savory, SJ
core   +1 more source

Coherent optical communications enhanced by machine intelligence

Machine Learning: Science and Technology, 2020
Abstract Accuracy in discriminating between different received coherent signals is integral to the operation of many free-space communications protocols, and is often difficult when the receiver measures a weak signal. Here we design an optical communication scheme that uses balanced homodyne detection in combination with an unsupervised
Sanjaya Lohani, Ryan T Glasser
openaire   +2 more sources

Impact and Compensation of Electrical-to-Optical Frequency Response on Carrierless Phase Retrieval Receivers

IEEE Photonics Journal
On carrierless phase retrieval (PR) receivers based on direct detection, bandwidth limitation of electrical-to-optical (E/O) conversion at the transmitter side (Tx) distorts the modulated optical signal.
Qi Gao, Hanzi Huang, Zhengxuan Li, Ziyue Liu, Yuanzhe Qu, Yingxiong Song   +5 more
doaj   +1 more source

Major Accomplishments in 2010 on Optical Fiber Communications

IEEE Photonics Journal, 2011
Optical fiber communications continued to advance at a rapid pace in 2010. This paper presents a brief overview of the most exciting technological advances of 2010, eking out record capacity out of optical fiber through enhancing spectral efficiency and ...
A. E. Willner, Z. Pan, M. I. Hayee
doaj   +1 more source

Propagation Properties of Partially Coherent Flat-Topped Beam Rectangular Arrays in Plasma and Atmospheric Turbulence

Photonics
Propagation properties represent a critical aspect of laser beams utilized in free space optical (FSO) communications. We examined the evolution characteristics of the electric field associated with partially coherent flat-topped beam rectangular arrays ...
Xinkai Ma, Hui Zhang, Yuanhao Zhao, LinXuan Yao, Changchun Yu, Yaru Gao, Yangsheng Yuan, Yangjian Cai, Bohan Guo   +8 more
doaj   +1 more source

Multi-Carrier Coherent Receiver Based on a Shared Optical Hybrid and a Cyclic AWG Array for Terabit/s Optical Transmission

IEEE Photonics Journal, 2010
We describe a multi-carrier coherent-receiver scheme where the coherent beating between an ultra-high-speed multi-carrier signal and multiple optical local oscillators (OLOs) is conducted in a single optical hybrid, followed by carrier separation through
Xiang Liu, D. M. Gill, S. Chandrasekhar, L. L. Buhl, M. Earnshaw, M. A. Cappuzzo, L. T. Gomez, Y. Chen, F. P. Klemens, E. C. Burrows, Y.-K. Chen, R. W. Tkach   +11 more
doaj   +1 more source

Research Progress on the Twisted Partially Coherent Beams

Nantong Daxue xuebao. Ziran kexue ban, 2020
Under the action of twist phase, partially coherent beams display their unique advantages in many applications fields, such as beam shaping, particle trapping, optical imaging, free-space communications, and so on.
WANG Haiyun; LIU Lin; CAI Yangjian
doaj   +1 more source

Terabit optical OFDM superchannel transmission via coherent carriers of a hybrid chip-scale soliton frequency comb

, 2018
We demonstrate seamless channel multiplexing and high bitrate superchannel transmission of coherent optical orthogonal-frequency-division-multiplexing (CO-OFDM) data signals utilizing a dissipative Kerr soliton (DKS) frequency comb generated in an on ...
Cui, Wenwen, Geng, Yong, Huang, Shu-Wei, Huang, Xiatao, Ling, Yun, Qiu, Kun, Wong, Chee Wei, Wu, Baojian, Xu, Bo, Yi, Xingwen, Zhang, Jin, Zhou, Heng   +11 more
core   +1 more source