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DSP-based Coherent Optical Systems: Receiver Sensitivity and Coding Aspects
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

User demand for faster access to more data is at a historic high and rising. One of the enabling technologies that makes the information age possible is fiber-optic communications, where light is used to carry information from one place to another over optical fiber. Since the technology was first shown to be feasible in the 1970s, it has been constantly evolving with each new generation of fiber-optic systems achieving higher data rates than its predecessor.

Today, the most promising approach for further increasing data rates is digital signal processing (DSP)-based coherent optical transmission with multi-level modulation. As multi-level modulation formats are very susceptible to noise and distortions, forward error correction (FEC) is typically used in such systems. However, FEC has traditionally been designed for additive white Gaussian noise (AWGN) channels, whereas fiber-optic systems also have other impairments. For example, there is relatively high phase noise (PN) from the transmitter and local oscillator (LO) lasers.

The contributions of this thesis are in two areas. First, we use a unified approach to analyze theoretical performance limits of coherent optical receivers and microwave receivers, in terms of signal-to-noise ratio (SNR) and bit error rate (BER). By using our general framework, we directly compare the performance of ten coherent optical receiver architectures and five microwave receiver architectures. In addition, we put previous publications into context, and identify areas of agreement and disagreement between them. Second, we propose straightforward methods to select codes for systems with PN. We focus on Bose-Chaudhuri-Hocquenghem (BCH) codes with simple implementations, which correct pre-FEC BERs around 10−3. Our methods are semi-analytical, and need only short pre-FEC simulations to estimate error statistics. We propose statistical models that can be parameterized based on those estimates. Codes can be selected analytically based on our models.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , xix, 63 p.
Series
TRITA-ICT, 2015:03
National Category
Communication Systems Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-166400ISBN: 978-91-7595-551-3 (print)OAI: oai:DiVA.org:kth-166400DiVA: diva2:810837
Presentation
2015-06-10, Sal C, Electrum 229, Isafjordsgatan 22, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 0379801EU, FP7, Seventh Framework Programme, 324391
Note

QC 20150528

Available from: 2015-05-28 Created: 2015-05-08 Last updated: 2015-05-28Bibliographically approved
List of papers
1. Receiver sensitivity in optical and microwave, heterodyne and homodyne systems
Open this publication in new window or tab >>Receiver sensitivity in optical and microwave, heterodyne and homodyne systems
2014 (English)In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 35, no 3, 221-229 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, we analyze the sensitivities of coherent optical receivers and microwave receivers. We derive theoretical limits of signal-to-noise ratio and bit error rate. By applying a generic approach to a broad range of receivers, we can compare their performance directly. Other publications have considered some of these receivers. However, their diverse nature obscures the big picture. Using our results as a unifying platform, previous publications can be compared and discrepancies between them identified.

Keyword
bit error rate (BER), coherent optical receivers, microwave receivers, receiver sensitivity, signal-to-noise ratio (SNR)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-161029 (URN)10.1515/joc-2013-0164 (DOI)2-s2.0-84906959441 (Scopus ID)
Note

QC 20150312

Available from: 2015-03-12 Created: 2015-03-06 Last updated: 2017-12-04Bibliographically approved
2. Dimensioning BCH Codes for Coherent DQPSK Systems With Laser Phase Noise and Cycle Slips
Open this publication in new window or tab >>Dimensioning BCH Codes for Coherent DQPSK Systems With Laser Phase Noise and Cycle Slips
Show others...
2014 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 32, no 21, 4048-4052 p.Article in journal (Refereed) Published
Abstract [en]

Forward error correction (FEC) plays a vital role in coherent optical systems employing multi-level modulation. However, much of coding theory assumes that additive white Gaussian noise (AWGN) is dominant, whereas coherent optical systems have significant phase noise (PN) in addition to AWGN. This changes the error statistics and impacts FEC performance. In this paper, we propose a novel semianalytical method for dimensioning binary Bose-Chaudhuri-Hocquenghem (BCH) codes for systems with PN. Our method involves extracting statistics from pre-FEC bit error rate (BER) simulations. We use these statistics to parameterize a bivariate binomial model that describes the distribution of bit errors. In this way, we relate pre-FEC statistics to post-FEC BER and BCHcodes. Our method is applicable to pre-FEC BER around 10(-3) and any post-FEC BER. Using numerical simulations, we evaluate the accuracy of our approach for a target post-FEC BER of 10(-5). Codes dimensioned with our bivariate binomial model meet the target within 0.2-dB signal-to-noise ratio.

Keyword
Bose-Chaudhuri-Hocquenghem (BCH) codes, coherent communications, cycle slips, forward error correction (FEC), phase noise
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-162978 (URN)10.1109/JLT.2014.2345768 (DOI)000350552200013 ()2-s2.0-84907495302 (Scopus ID)
Note

QC 20150331

Available from: 2015-03-31 Created: 2015-03-26 Last updated: 2017-12-04Bibliographically approved
3. Interleavers and BCH Codes for Coherent DQPSK Systems With Laser Phase Noise
Open this publication in new window or tab >>Interleavers and BCH Codes for Coherent DQPSK Systems With Laser Phase Noise
Show others...
2015 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 27, no 7, 685-688 p.Article in journal (Refereed) Published
Abstract [en]

The relatively high phase noise of coherent optical systems poses unique challenges for forward error correction (FEC). In this letter, we propose a novel semianalytical method for selecting combinations of interleaver lengths and binary Bose-Chaudhuri-Hocquenghem (BCH) codes that meet a target post-FEC bit error rate (BER). Our method requires only short pre-FEC simulations, based on which we design interleavers and codes analytically. It is applicable to pre-FEC BER similar to 10(-3), and any post-FEC BER. In addition, we show that there is a tradeoff between code overhead and interleaver delay. Finally, for a target of 10(-5), numerical simulations show that interleaver-code combinations selected using our method have post-FEC BER around 2x target. The target BER is achieved with 0.1 dB extra signal-to-noise ratio.

Keyword
Optical fiber communications, error correction codes, block codes, phase noise, communication systems
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-163953 (URN)10.1109/LPT.2014.2385731 (DOI)000350877700001 ()2-s2.0-84924410228 (Scopus ID)
Funder
Swedish Research Council, 0379801EU, FP7, Seventh Framework Programme, 324391
Note

QC 20150506

Available from: 2015-05-06 Created: 2015-04-13 Last updated: 2017-12-04Bibliographically approved
4. Dimensioning RS codes for mitigation of phase noise induced cycle slips in DQPSK systems
Open this publication in new window or tab >>Dimensioning RS codes for mitigation of phase noise induced cycle slips in DQPSK systems
Show others...
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We present a semi-analytical method for dimensioning Reed-Solomon codes for coherent DQPSK systems with laser phase noise and cycle slips. We evaluate the accuracy of our method for a 28 Gbaud system using numerical simulations.

Place, publisher, year, edition, pages
Optical Society of America, 2014
Series
Asia Communications and Photonics Conference, ACPC 2014, ISSN 2162-108X
Keyword
Numerical methods, Photonics, Reed-Solomon codes, Cycle slips, Induced cycle, Laser phase noise, RS codes, Semi-analytical methods
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:kth:diva-168206 (URN)2-s2.0-84942366204 (Scopus ID)978-155752852-0 (ISBN)
Conference
Asia Communications and Photonics Conference, ACPC 2014, Shanghai, China, 11 November 2014 through 14 November 2014
Note

QC 20150528

Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2015-11-19Bibliographically approved

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