71 citations · 168 across the 18 of their papers we have counts for
18 papers
Information Rate in Ultra-Wideband Optical Fiber Communication Systems Accounting for High-Order Dispersion
Nikita A. Shevchenko, Tianhua Xu, Cenqin Jin +3
The effect of Kerr-induced optical fiber nonlinearities in C-band (5 THz) EDFA and C+L-band (12.5 THz) Raman-amplified optical communication systems has been studied considering th…
Digital Nonlinearity Compensation in High-Capacity Optical Fibre Communication Systems: Performance and Optimisation
Tianhua Xu, Nikita A. Shevchenko, Boris Karanov +4
Meeting the ever-growing information rate demands has become of utmost importance for optical communication systems. However, it has proven to be a challenging task due to the pres…
Digital Signal Processing for Optical Communications and Networks I: Linear Compensation
Tianhua Xu
The achievable information rates of optical communication networks have been widely increased over the past four decades with the introduction and development of optical amplifiers…
Achievable information rates estimates in optically-amplified transmission systems using nonlinearity compensation and probabilistic shaping
Daniel Semrau, Tianhua Xu, Nikita A. Shevchenko +4
Achievable information rates (AIRs) of wideband optical communication systems using ~40 nm (~5 THz) EDFA and ~100 nm (~12.5 THz) distributed Raman amplification are estimated based…
Analytical Investigations on Carrier Phase Recovery in Dispersion-Unmanaged n-PSK Coherent Optical Communication Systems
Tianhua Xu, Gunnar Jacobsen, Sergei Popov +4
Using coherent optical detection and digital signal processing, laser phase noise and equalization enhanced phase noise can be effectively mitigated using the feed-forward and feed…
Analytical Estimation in Differential Optical Transmission Systems Influenced by Equalization Enhanced Phase Noise
Tianhua Xu, Gunnar Jacobsen, Sergei Popov +3
An analytical model is presented for assessing the performance of the bit-error-rate (BER) in the differential m-level phase shift keying (m-PSK) transmission systems, where the in…
Phase Noise Influence in Long-range Coherent Optical OFDM Systems with Delay Detection, IFFT Multiplexing and FFT Demodulation
Gunnar Jacobsen, Tianhua Xu, Sergei Popov +2
We present a study of the influence of dispersion induced phase noise for CO-OFDM systems using FFT multiplexing/IFFT demultiplexing techniques (software based). The software based…
Phase Noise Influence in Optical OFDM Systems employing RF Pilot Tone for Phase Noise Cancellation
Gunnar Jacobsen, Leonid G. Kazovsky, Tianhua Xu +4
For coherent and direct-detection Orthogonal Frequency Division Multiplexed (OFDM) systems employing radio frequency (RF) pilot tone phase noise cancellation the influence of laser…
Influence of Pre- and Post-compensation of Chromatic Dispersion on Equalization Enhanced Phase Noise in Coherent Multilevel Systems
Gunnar Jacobsen, Marisol Lidón, Tianhua Xu +3
In this paper we present a comparative study in order to specify the influence of equalization enhanced phase noise (EEPN) for pre- and post-compensation of chromatic dispersion in…
Phase Noise Influence in Coherent Optical OFDM Systems with RF Pilot Tone: Digital IFFT Multiplexing and FFT Demodulation
Gunnar Jacobsen, Tianhua Xu, Sergei Popov +3
We present a comparative study of the influence of dispersion induced phase noise for CO-OFDM systems using Tx channel multiplexing and Rx matched filter (analogue hardware based);…
Analysis of chromatic dispersion compensation and carrier phase recovery in long-haul optical transmission system influenced by equalization enhanced phase noise
Tianhua Xu, Gunnar Jacobsen, Sergei Popov +5
The performance of long-haul coherent optical fiber transmission system is significantly affected by the equalization enhanced phase noise (EEPN), due to the interaction between th…
Dynamic physical layer equalization in optical communication networks
Tianhua Xu, Gunnar Jacobsen, Jie Li +2
In optical transport networks, signal lightpaths between two terminal nodes can be different due to current network conditions. Thus the transmission distance and accumulated dispe…
Digital Adaptive Carrier Phase Estimation in Multi-Level Phase Shift Keying Coherent Optical Communication Systems
Tianhua Xu, Tiegen Liu, Yimo Zhang +3
The analysis of adaptive carrier phase estimation is investigated in long-haul high speed n-level phase shift keying (n-PSK) optical fiber communication systems based on the one-ta…
Frequency-Domain Chromatic Dispersion Equalization Using Overlap-Add Methods in Coherent Optical System
Tianhua Xu, Gunnar Jacobsen, Sergei Popov +7
The frequency domain equalizers (FDEs) employing two types of overlap-add zero-padding (OLA-ZP) methods are applied to compensate the chromatic dispersion in a 112-Gbit/s non-retur…
Carrier Phase Estimation in Dispersion-Unmanaged Optical Transmission Systems
Tianhua Xu, Polina Bayvel, Tiegen Liu +4
The study on carrier phase estimation (CPE) approaches, involving a one-tap normalized least-mean-square (NLMS) algorithm, a block-wise average algorithm, and a Viterbi-Viterbi alg…
Design and experiment of electronic speckle shearing phase-shifting pattern interferometer
Tianhua Xu, Chao Jing, Wencai Jing +3
An electronic speckle shearing phase-shifting pattern interferometer (ESSPPI) based on Michelson interferometer was based in this paper. A rotatable mirror driven by a step motor i…
Distributed measurement of mode coupling in birefringent fibers with random polarization modes
Tianhua Xu, Feng Tang, Wencai Jing +5
A scanning white light interferometer is developed to measure the distributed polarization coupling (DPC) in high birefringence polarization maintaining fibers (PMFs). Traditionall…
Close-Form Expression of One-Tap Normalized LMS Carrier Phase Recovery in Optical Communication Systems
Tianhua Xu, Gunnar Jacobsen, Sergei Popov +3
The performance of long-haul high speed coherent optical fiber communication systems is significantly degraded by the laser phase noise and the equalization enhanced phase noise (E…