Coherent optical receiver for pilot-assisted data transmission

X Liu, C Sethumadhavan - US Patent 8,515,286, 2013 - Google Patents
Disclosed herein are various embodiments of a coherent optical receiver for a data-frame
format in which a data frame has two or more pilot-Symbol blocks, each having a cyclic …

Optical OFDM synchronization with symbol timing offset and sampling clock offset compensation in real-time IMDD systems

XQ Jin, JM Tang - IEEE Photonics Journal, 2011 - ieeexplore.ieee.org
End-to-end real-time Optical Orthogonal Frequency Division Multiplexing (OOFDM) signal
synchronization that is capable of simultaneously compensating for both Symbol Timing …

Symbol synchronization exploiting the symmetric property in optical fast OFDM

J Zhao, SK Ibrahim, D Rafique… - IEEE Photonics …, 2011 - ieeexplore.ieee.org
We propose a new simple method to achieve precise symbol synchronization using one
start-of-frame (SOF) symbol in optical fast orthogonal frequency-division multiplexing …

Pilot-assisted data transmission in a coherent optical-communication system

X Liu, C Sethumadhavan - US Patent 8,660,433, 2014 - Google Patents
In one embodiment, an optical transmission system transmits data using a format according
to which a data frame has two or more pilot-symbol blocks, each having a guard interval …

Method and apparatus for transmitting high-level QAM optical signals with binary drive signals

X Liu, C Sethumadhavan - US Patent 8,953,949, 2015 - Google Patents
Methods and apparatus for power-efficiently and reliably transmitting high-level quadrature
amplitude modulation (QAM) optical signals using binary drive signals. Even though binary …

Channel estimation and synchronization for polarization-division multiplexed CO-OFDM using subcarrier/polarization interleaved training symbols

CJ Youn, X Liu, S Chandrasekhar, YH Kwon, JH Kim… - Optics …, 2011 - opg.optica.org
We propose and demonstrate the use of subcarrier/polarization-interleaved training symbols
for channel estimation and synchronization in polarization-division multiplexed (PDM) …

Non-rectangular perfect reconstruction pulse shaping based ICI reduction in CO-OFDM

T Kanesan, ST Le, D Roque, AD Ellis - Optics express, 2014 - opg.optica.org
In this paper, we propose to increase residual carrier frequency offset tolerance based on
short perfect reconstruction pulse shaping for coherent optical-orthogonal frequency division …

Experimental demonstration of 5-Gb/s polarization-multiplexed fiber-wireless MIMO systems

Y Zhao, X Pang, L Deng, MB Othman… - … Topical Meeting on …, 2011 - ieeexplore.ieee.org
We experimentally demonstrate a 5-Gb/s fiber-wireless transmission system combining
optical polarization-division-multiplexing (PDM) and wireless multiple-input, multiple-output …

CFO compensation method using optical feedback path for coherent optical OFDM system

SR Moon, IK Hwang, HS Kang, SH Chang… - Optical Fiber …, 2017 - Elsevier
We investigate feasibility of carrier frequency offset (CFO) compensation method using
optical feedback path for coherent optical orthogonal frequency division multiplexing (CO …

High-capacity hybrid optical fiber-wireless communications links in access networks

X Pang - 2013 - orbit.dtu.dk
Integration between fiber-optic and wireless communications systems in the" last mile"
access networks is currently considered as a promising solution for both service providers …