NDLI: Performance investigation of under/over-sampling for arbitrary DP-MQAM optical transmitter

Content Provider	IEEE Xplore Digital Library
Author	Ragheb, A.M. Seleem, H. Fathallah, H. Alshebeili, S. Fischer, H. Doberstein, A. Haisch, H.
Copyright Year	2015
Description	Author affiliation: Digital Photonic Test Div.., Agilent Technol. R&D & Marketing GmbH & Co. KG, Boeblingen, Germany (Fischer, H.; Doberstein, A.; Haisch, H.) \|\| KACST-TIC in Radio Freq. & Photonics for the eSociety (RFTONICS), King Saud Univ., Riyadh, Saudi Arabia (Ragheb, A.M.; Seleem, H.; Fathallah, H.; Alshebeili, S.)
Abstract	In this paper, we experimentally investigate the effect of state-of-the-art digital to analog converter (DAC) circuit, on the performance of high speed optical transmitter. We particularly consider two operating regimes, we refers as over- and under-sampling conditions. It is well known that a sampling rate of 64GSa/s limits the maximum baud rate to 32Gbaud with a sampling rate of 2 sample/symbol as a standard oversampling. However, in a number of applications including test, characterization, and measurement of advanced communication systems, it is needed to test the capacity to use the hardware well above its normal operation regime. One important, yet attractive testing, is to examine the behavior of an overall communication system or its subsystems in case of 2-fold criterion is not respected. In these cases, the optical transmitter is constrained to generate and transmit optical symbols at a baud rate that is much higher than the half of the hardware limited sampling rate. In our case, we generate variable baud rates higher than 32Gbaud using an always fixed sampling rate 64GSa/s (i.e. limited by hardware). We hence constrain our symbols to be generated by less than 2 samples/symbol we refer as under sampling regime. Our experimental results show that in under sampling regime, we obtain a variable baud rate ranging from 32 up to 56Gbaud using a sampling ratio starting by 2 and decreasing down to 1.14 respectively. In addition we show, how these high and variable baud rates, have been achieved at the expense of much larger spectral bandwidth, important signal distortions especially for the highest frequency band, and a net decrease in the modulation order from 128 down to 4. We also investigate the performance of the generated signals in terms of bit error rate (BER) and error vector magnitude (EVM) and illustrate how the performance dramatically degrades as the sampling rate decreases. Furthermore, we digitally pre-emphasize the DP-MQAM Optical transmitter in order to pre-compensate for devices imperfections. This relaxes the signal processing at the receiver side at a maximum expense of 1dB penalty for 32Gbaud speed.
Starting Page	164
Ending Page	167
File Size	722177
Page Count	4
File Format	PDF
ISBN	9781479989669
DOI	10.1109/ICTRC.2015.7156447
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-17
Publisher Place	United Arab Emirates
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fibers Coherent optical communications Bit error rate Modulation Bandwidth Optical fiber communication Complex modulation Oversampling Optical transmitters Multi-format Next generation networking Flexible optical transmitter
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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