NDLI: Analogue-to-digital converter phase insensitive dispersion search method with large search step size for low computational cost

Content Provider	IET Digital Library
Author	Xu, Bo Yu, Tao Ling, Yun Qiu, Kun
Abstract	Accumulated chromatic dispersion (CD) estimation is crucial for frequency-domain equalisation in an optical coherent digital receiver. To solve the problems of small search step size and analogue-to-digital converter (ADC) sampling phase sensitivity from conventional CD searching algorithm, a CD searching method with modified shift parameters and waveforms is proposed in this study. The modified CD searching method allows a much larger search step size and can achieve faster CD estimation with low computational complexity. The performance of the modified CD searching method is also insensitive to ADC sampling phase. On the basis of simulation results, a very low search error probability is confirmed with a search step size of 50 km. About 1 K symbols are found to be enough for dispersion estimation. After the frequency-domain equaliser (FDE) with the estimated dispersion value, the residual dispersion length <30 km can be well compensated with a 9-tap adaptive time-domain equaliser (TDE) with fast convergence. The overall error rate performance of the tunable electrical dispersion compensation is also studied and compared with lumped and distributed optical dispersion compensation for dynamically switched optical networks.
Starting Page	131
Ending Page	138
Page Count	8
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 2, Jan (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2014.0937
Journal	IET Communications
Publisher Date	2016-01-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	9-tap Adaptive Time-domain Equaliser Accumulated Chromatic Dispersion Estimation Adaptive Equalisers ADC Sampling Phase Sensitivity Analogue-Digital Conversion Analogue-to-digital Converter Phase Insensitive Dispersion Search Method CD Estimation Communication Channel Equalisation And Identification Computational Complexity Dynamically Switched Optical Network Error Probability Error Statistics FDE Frequency-domain Equalisation Mathematical Analysis Optical Coherent Digital Receiver Optical Communication Equipment Optical Fibre Dispersion Optical Fibre Network Optical Receiver Residual Dispersion Length Statistics TDE Time-frequency Analysis Tunable Electrical Dispersion Compensation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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