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Phase Noise Tolerant Modulation Formats and DSP Algorithms for Coherent Optical Systems
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Optik och Fotonik, OFO. ACREO Swedish ICT.ORCID-id: 0000-0001-5730-9656
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Coherent detection together with multilevel modulation formats has the potential to significantly increase the capacity of existing optical communication systems at no extra cost in signal bandwidth. However, these modulation formats are more susceptible to the impact of different noise sources and distortions as the distance between its constellation points in the complex plane reduces with the modulation index. In this context, digital signal processing (DSP) plays a key role as it allows compensating for the impairments occurring during signal generation, transmission and/or detection relaxing the complexity of the overall system. The transition towards pluggable optical transceivers, offers flexibility for network design/upgrade but sets strict requirements on the power consumption of the DSP thus limiting its complexity. The DSP module complexity however, scales with the modulation order and, in this scenario, low complex yet high performance DSP algorithms are highly desired.

In this thesis, we mainly focus on the impact of laser phase noise arising from the transmitter and local oscillator (LO) lasers in coherent optical communication systems employing high order modulation formats. In these systems, the phase noise of the transmitting and LO lasers translate into phase noise in the received constellation impeding the proper recovery of the transmitted data. In order to increase the system phase noise tolerance, we firstly explore the possibility of re-arranging the constellation points in a circularly shaped mQAM (C-mQAM) constellation shape to exploit its inherent phase noise tolerance. Different low-complex carrier phase recovery (CPR) schemes applicable to these constellations are proposed along with a discussion on its performance and implementation complexity. Secondly, the design guidelines of high performance and low complex CPR schemes for conventional square mQAM constellations are presented. We identify the inherent limitation of the state-of-the-art blind phase search (BPS) carrier phase recovery algorithm which hinders its achievable performance and implementation complexity and present a low complex solution to overcome it. The design guidelines of multi-stage CPR schemes for high order modulation formats, where the BPS algorithm is employed at any of the stages, are also provided and discussed. Finally, the interplay between the received dispersed signal and the LO phase noise is analytically investigated to characterize the origin of the equalization enhanced phase noise phenomena.

Ort, förlag, år, upplaga, sidor
Stockholm, Sweden: KTH Royal Institute of Technology, 2017. , s. 67
Serie
TRITA-FYS, ISSN 0280-316X
Nyckelord [en]
optical communications, carrier phase recovery, blind phase search, circular quadrature amplitude modulation, CmQAM, coherent optical communications, digital signal processing, carrier phase estimation, equalization enhanced phase noise, EEPN
Nationell ämneskategori
Telekommunikation
Forskningsämne
Telekommunikation
Identifikatorer
URN: urn:nbn:se:kth:diva-207034ISBN: 978-91-7729-424-5 (digital)OAI: oai:DiVA.org:kth-207034DiVA, id: diva2:1095355
Disputation
2017-06-09, Electrum, Sal C, Isafjordsgatan 22, Kista, 10:00 (Engelska)
Opponent
Handledare
Projekt
EU project ICONE, gr. #608099
Anmärkning

QC 20170516

Tillgänglig från: 2017-05-16 Skapad: 2017-05-12 Senast uppdaterad: 2017-05-17Bibliografiskt granskad
Delarbeten
1. Adaptive Boundaries Scheme for Cycle-Slip Mitigation in C-mQAM Coherent Systems
Öppna denna publikation i ny flik eller fönster >>Adaptive Boundaries Scheme for Cycle-Slip Mitigation in C-mQAM Coherent Systems
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2015 (Engelska)Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 27, nr 20, s. 2154-2157Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We propose a method for cycle-slip mitigation in circular multilevel quadrature amplitude modulation (C-mQAM) coherent optical systems, with constellation rotational asymmetry, based on an adaptive boundaries approach. The impact of cycle-slips in C-mQAM coming from Viterbi-Viterbi algorithm limits the phase noise tolerance. By introducing adaptive boundaries and a differential coding scheme, the ambiguity of asymmetrical rotation of constellation can be effectively removed. Performance of the proposed method is evaluated for a C-16QAM and C-64QAM for various laser linewidths. Results show a noticeable improvement in linewidth symbol duration product (Delta(upsilon) . T-S) tolerance compared with the previous studies on C-mQAM and mQAM constellations. The Delta(upsilon) . T-S tolerance reaches 4 x 10(-4) and 1.1 x 10(-4) for C-16QAM and C-64QAM, respectively, for 1 dB penalty at a symbol error rate of 10(-3).

Ort, förlag, år, upplaga, sidor
[Navarro, Jaime Rodrigo; Pang, Xiaodan; Ozolins, Oskars; Jacobsen, Gunnar] Acreo Swedish ICT AB, Network & Transmiss Lab, S-16425 Kista, Sweden. [Navarro, Jaime Rodrigo] Royal Inst Technol, S-11428 Stockholm, Sweden. [Kakkar, Aditya; Schatz, Richard; Popov, Sergei] Royal Inst Technol, Opt & Photon Div, S-11428 Stockholm, Sweden.: , 2015
Nyckelord
Carrier phase estimation, circular quadrature amplitude modulation, coherent optical communications, differential decoding
Nationell ämneskategori
Annan fysik
Identifikatorer
urn:nbn:se:kth:diva-175483 (URN)10.1109/LPT.2015.2455234 (DOI)000361685200012 ()2-s2.0-84959330772 (Scopus ID)
Anmärkning

QC 20151028

Tillgänglig från: 2015-10-28 Skapad: 2015-10-16 Senast uppdaterad: 2017-12-01Bibliografiskt granskad
2. Carrier Phase Recovery Algorithms for Coherent Optical Circular mQAM Systems
Öppna denna publikation i ny flik eller fönster >>Carrier Phase Recovery Algorithms for Coherent Optical Circular mQAM Systems
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2016 (Engelska)Ingår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 34, nr 11, s. 2717-2723Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The phase noise tolerance of circular multilevel quadrature amplitude modulation (C-mQAM) constellations employing different carrier phase recovery (CPR) algorithms is studied. A differential decoding scheme and a bit mapping for this type of constellations are proposed. A novel CPR scheme for C-mQAM constellations is also presented. The particular distribution of the constellation points in a C-mQAM signal is exploited to reduce the required Nth power for the removal of the modulation component by a factor of two. Hence, the computational complexity of the proposed algorithm is drastically reduced. The combined linewidth symbol duration product (Delta nu T-s) tolerance of different CPR algorithms for C-mQAM constellations is studied and compared with the proposed CPR scheme. The results are analyzed at 3.8e-3 and 1e-2 bit error rate forward error correction limits. The proposed CPR scheme achieves similar Delta nu Ts tolerance compared to single stage BPS algorithm while its computational complexity is reduced by group factors of 27.2 vertical bar 32.3, and 30.5 vertical bar 32.6 (in the form of multipliers vertical bar adders) for C-16QAM and C-64QAM, respectively.

Nyckelord
Carrier phase recovery (CPR), circular quadrature amplitude modulation (C-mQAM), coherent detection, differential decoding, phase noise
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:kth:diva-190512 (URN)10.1109/JLT.2016.2545339 (DOI)000379751000015 ()2-s2.0-84971351207 (Scopus ID)
Anmärkning

QC 20160818

Tillgänglig från: 2016-08-18 Skapad: 2016-08-12 Senast uppdaterad: 2017-11-28Bibliografiskt granskad
3. Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems
Öppna denna publikation i ny flik eller fönster >>Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems
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2016 (Engelska)Ingår i: PHOTONICS, ISSN 2304-6732, Vol. 3, nr 2, artikel-id 37Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A novel two-stage n-PSK partitioning carrier phase recovery (CPR) scheme for circular multilevel quadrature amplitude modulation (C-mQAM) constellations is presented. The first stage of the algorithm provides an initial rough estimation of the received constellation, which is utilized in the second stage for CPR. The performance of the proposed algorithm is studied through extensive simulations at the forward error correction bit error rate targets of 3.8 x 10(-3) and 1 x 10(-2) and is compared with different CPR algorithms. A significant improvement in the combined linewidth symbol duration product (Delta vT(s)) tolerance is achieved compared to the single-stage n-PSK partitioning scheme. Superior performance in the Delta vT(s) tolerance compared to the blind phase search algorithm is also reported. The relative improvements with respect to other CPR schemes are also validated experimentally for a 28-Gbaud C-16QAM back-to-back transmission system. The computational complexity of the proposed CPR scheme is studied, and reduction factors of 24.5 broken vertical bar 30.1 and 59.1 broken vertical bar 63.3 are achieved for C-16QAM and C-64QAM, respectively, compared to single-stage BPS in the form of multipliers broken vertical bar adders.

Ort, förlag, år, upplaga, sidor
MDPI AG, 2016
Nyckelord
carrier phase recovery (CPR), circular quadrature amplitude modulation (C-mQAM), coherent detection, phase noise
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:kth:diva-192766 (URN)10.3390/photonics3020037 (DOI)000381860000026 ()2-s2.0-85030866389 (Scopus ID)
Anmärkning

QC 20160926

Tillgänglig från: 2016-09-26 Skapad: 2016-09-20 Senast uppdaterad: 2017-11-02Bibliografiskt granskad
4. Phase noise tolerant carrier recovery scheme for 28 Gbaud circular 16QAM
Öppna denna publikation i ny flik eller fönster >>Phase noise tolerant carrier recovery scheme for 28 Gbaud circular 16QAM
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2015 (Engelska)Ingår i: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers (IEEE), 2015Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We propose a novel carrier phase recovery scheme for circular 16QAM coherent transmission systems. Experimental results show low penalties (<1.4 dB) even for linewidths where square 16QAM exhibits irretrievable (above the FEC limit) error floor.

Ort, förlag, år, upplaga, sidor
Institute of Electrical and Electronics Engineers (IEEE), 2015
Nyckelord
Quadrature amplitude modulation, Carrier phase recovery, Carrier recovery, Coherent transmission systems, Error floor, Optical communication
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:kth:diva-186811 (URN)10.1109/ECOC.2015.7341657 (DOI)000377373100048 ()2-s2.0-84957837128 (Scopus ID)9788460817413 (ISBN)
Konferens
41st European Conference on Optical Communication, ECOC 2015, 27 September 2015 through 1 October 2015
Anmärkning

QC 20160601

Tillgänglig från: 2016-06-01 Skapad: 2016-05-13 Senast uppdaterad: 2017-11-08Bibliografiskt granskad
5. Blind  phase  search  with  angular  quantization  noise mitigation for efficient carrier phase recovery
Öppna denna publikation i ny flik eller fönster >>Blind  phase  search  with  angular  quantization  noise mitigation for efficient carrier phase recovery
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2017 (Engelska)Ingår i: Photonics, ISSN 2304-6732, Vol. 4, nr 2, artikel-id 37Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The inherent discrete phase search nature of the conventional blind phase search (C-BPS) algorithm is found to introduce angular quantization noise in its phase noise estimator. The angular quantization noise found in the C-BPS is shown to limit its achievable performance and its potential low complexity implementation. A novel filtered BPS algorithm (F-BPS) is proposed and demonstrated to mitigate this quantization noise by performing a low pass filter operation on the C-BPS phase noise estimator. The improved performance of the proposed F-BPS algorithm makes it possible to significantly reduce the number of necessary test phases to achieve the C-BPS performance, thereby allowing for a drastic reduction of its practical implementation complexity. The proposed F-BPS scheme performance is evaluated on a 28-Gbaud 16QAM and 64QAM both in simulations and experimentally. Results confirm a substantial improvement of the performance along with a significant reduction of its potential implementation complexity compared to that of the C-BPS.

Ort, förlag, år, upplaga, sidor
MDPI AG, 2017
Nationell ämneskategori
Telekommunikation
Identifikatorer
urn:nbn:se:kth:diva-207114 (URN)10.3390/photonics4020037 (DOI)2-s2.0-85029468731 (Scopus ID)
Anmärkning

QC 20170516

Tillgänglig från: 2017-05-16 Skapad: 2017-05-16 Senast uppdaterad: 2018-03-07Bibliografiskt granskad
6. High Performance and Low Complexity Carrier Phase Recovery Schemes for 64-QAM Coherent Optical Systems
Öppna denna publikation i ny flik eller fönster >>High Performance and Low Complexity Carrier Phase Recovery Schemes for 64-QAM Coherent Optical Systems
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2017 (Engelska)Ingår i: Optics InfoBase Conference Papers, Optical Society of America, 2017Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We experimentally validate two novel CPR schemes outperforming existing CPRs in complexity and performance. A complexity reduction of at least a factor of 4 is reported compared to the BPS algorithm for a 64QAM system.

Ort, förlag, år, upplaga, sidor
Optical Society of America, 2017
Nationell ämneskategori
Telekommunikation
Identifikatorer
urn:nbn:se:kth:diva-207115 (URN)10.1364/OFC.2017.W2A.53 (DOI)000403405800605 ()2-s2.0-85019942945 (Scopus ID)
Konferens
Optical Fiber Communication Conference, OFC 2017, Los Angeles, United States, 19 March 2017 through 23 March 2017
Anmärkning

QC 20170516

Tillgänglig från: 2017-05-16 Skapad: 2017-05-16 Senast uppdaterad: 2017-11-10Bibliografiskt granskad
7. Design of Multi-Stage Carrier Phase Recovery Schemes for  high  order  Coherent  Optical  mQAM  Systems
Öppna denna publikation i ny flik eller fönster >>Design of Multi-Stage Carrier Phase Recovery Schemes for  high  order  Coherent  Optical  mQAM  Systems
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(Engelska)Artikel i tidskrift (Refereegranskat) Submitted
Nationell ämneskategori
Telekommunikation
Identifikatorer
urn:nbn:se:kth:diva-207116 (URN)
Anmärkning

QC 20170516

Tillgänglig från: 2017-05-16 Skapad: 2017-05-16 Senast uppdaterad: 2017-05-16Bibliografiskt granskad
8. Comprehensive study of equalization-enhanced phase noise in coherent optical systems
Öppna denna publikation i ny flik eller fönster >>Comprehensive study of equalization-enhanced phase noise in coherent optical systems
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2015 (Engelska)Ingår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 33, nr 23, s. 4834-4841, artikel-id 7299252Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A thorough analysis of equalization-enhanced phase noise (EEPN) and its impact on the coherent optical system is presented. We show with a time-domain analysis that EEPN is caused due to the interference of multiple delayed versions of the dispersed signal, generated by intermixing of the received dispersed signal, and the noise side bands of the local oscillator (LO) in the photodetectors. We derive statistical properties such as the mean, variance, and error vector magnitude of the received signal influenced with EEPN. We show that in coherent optical systems utilizing electronic dispersion compensation, this noise corresponds to multipath fading in wireless communication systems. Closed-form expressions of necessary LO linewidth and/or mitigation bandwidth for a general system configuration and specified OSNR penalty are given. The expressions for system design parameters, validated with system simulations, show that higher order modulation formats, such as 16-quadrature amplitude modulation and beyond, put stringent demands on the LO linewidth unless a mitigation technique is used.

Nyckelord
Coherent receivers, digital signal processing (DSP), electronic dispersion compensation (EDC), equalization-enhanced phase noise (EEPN), laser linewidth, multipath fading, optical communication, quadrature amplitude modulation (QAM), Amplitude modulation, Dispersion compensation, Linewidth, Optical systems, Phase noise, Quadrature amplitude modulation, Signal processing, Signal receivers, Time domain analysis, Wireless telecommunication systems, Electronic dispersion compensation, Equalization enhanced phase noises (EEPN), Laser line-width, Quadrature-amplitude modulations (QAM), Modulation
Nationell ämneskategori
Nanoteknik
Identifikatorer
urn:nbn:se:kth:diva-186809 (URN)10.1109/JLT.2015.2491363 (DOI)2-s2.0-84960120889 (Scopus ID)
Anmärkning

QC 20160527

Tillgänglig från: 2016-05-27 Skapad: 2016-05-13 Senast uppdaterad: 2019-10-02Bibliografiskt granskad
9. Impact of local oscillator frequency noise on coherent optical systems with electronic dispersion compensation
Öppna denna publikation i ny flik eller fönster >>Impact of local oscillator frequency noise on coherent optical systems with electronic dispersion compensation
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2015 (Engelska)Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, nr 9, s. 11221-11226Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A theoretical investigation of the equalization-enhanced phase noise (EEPN) and its mitigation is presented. We show with a frequency domain analysis that the EEPN results from the non-linear inter-mixing between the sidebands of the dispersed signal and the noise sidebands of the local oscillator. It is further shown and validated with system simulations that the transmission penalty is mainly due to the slow optical frequency fluctuations of the local oscillator. Hence, elimination of the frequency noise below a certain cut-off frequency significantly reduces the transmission penalty, even when frequency noise would otherwise cause an error floor. The required cut-off frequency increases linearly with the white frequency noise level and hence the linewidth of the local oscillator laser, but is virtually independent of the symbol rate and the accumulated dispersion.

Nyckelord
Enhanced Phase Noise, RF Pilot, Equalization, Transmission, EEPN
Nationell ämneskategori
Annan fysik
Identifikatorer
urn:nbn:se:kth:diva-169270 (URN)10.1364/OE.23.011221 (DOI)000354337700035 ()25969218 (PubMedID)
Anmärkning

QC 20150615

Tillgänglig från: 2015-06-15 Skapad: 2015-06-12 Senast uppdaterad: 2017-12-04Bibliografiskt granskad
10. A path to use large linewidth LO in 28 Gbd 16-QAM metro links
Öppna denna publikation i ny flik eller fönster >>A path to use large linewidth LO in 28 Gbd 16-QAM metro links
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2015 (Engelska)Ingår i: European Conference on Optical Communication, ECOC, IEEE , 2015Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We experimentally investigate the possibility to mitigate local oscillator induced Equalization Enhanced Phase Noise penalty. The results pave the way for the use of even 10 MHz linewidth local oscillator lasers in 28 Gbd 16-QAM metro links.

Ort, förlag, år, upplaga, sidor
IEEE, 2015
Nyckelord
Phase noise, Quadrature amplitude modulation, Equalization enhanced phase noise, Local oscillators, Optical communication
Nationell ämneskategori
Nanoteknik
Identifikatorer
urn:nbn:se:kth:diva-186812 (URN)10.1109/ECOC.2015.7341948 (DOI)000377373100339 ()2-s2.0-84957827876 (Scopus ID)9788460817413 (ISBN)
Konferens
41st European Conference on Optical Communication, ECOC 2015, 27 September 2015 through 1 October 2015
Anmärkning

QC 20160527

Tillgänglig från: 2016-05-27 Skapad: 2016-05-13 Senast uppdaterad: 2017-11-06Bibliografiskt granskad
11. Mitigation of EEPN in Coherent Optical Systems With Low-Speed Digital Coherence Enhancement
Öppna denna publikation i ny flik eller fönster >>Mitigation of EEPN in Coherent Optical Systems With Low-Speed Digital Coherence Enhancement
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2015 (Engelska)Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 27, nr 18, s. 1942-1945Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A method for mitigating local oscillator (LO) phase noise-induced impairment, also known as equalization-enhanced phase noise, in coherent optical systems is discussed. The method is suitable for real-time implementation and requires hardware with a bandwidth much lower than the signal baud rate, even for a system utilizing conventional semiconductor laser as LO. We evaluate the required parameters like interpolation technique, electrical signal-to-noise ratio at digital coherence enhancement (DCE) front end, for long haul transmission links having quadrature phase shift keying and 16-quadrature amplitude modulation formats. We show that the method can be implemented using a low-speed DCE front end and a simple digital linear interpolator with small (<1 dB) implementation penalty even in cases that would otherwise result in error floor.

Nyckelord
Coherent receivers, quadrature amplitude modulation (QAM), equalization-enhanced phase noise, laser linewidth, optical communication
Nationell ämneskategori
Annan fysik
Identifikatorer
urn:nbn:se:kth:diva-173759 (URN)10.1109/LPT.2015.2447839 (DOI)000360375000013 ()2-s2.0-84940376664 (Scopus ID)
Anmärkning

QC 20150923

Tillgänglig från: 2015-09-23 Skapad: 2015-09-18 Senast uppdaterad: 2017-12-01Bibliografiskt granskad
12. Overcoming EEPN in Coherent Transmission Systems
Öppna denna publikation i ny flik eller fönster >>Overcoming EEPN in Coherent Transmission Systems
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2016 (Engelska)Ingår i: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE conference proceedings, 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We for the first time experimentally demonstrate a simple technique to overcome EEPN. Performance recovery from above FEC to <1 dB penalty for 28 Gbd 16-QAM over 520 km with high LO linewidth is achieved.

Ort, förlag, år, upplaga, sidor
IEEE conference proceedings, 2016
Serie
Conference on Lasers and Electro-Optics, ISSN 2160-9020
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:kth:diva-201284 (URN)000391286402479 ()2-s2.0-85010682957 (Scopus ID)978-1-9435-8011-8 (ISBN)
Konferens
Conference on Lasers and Electro-Optics (CLEO), JUN 05-10, 2016, San Jose, CA
Anmärkning

QC 20170215

Tillgänglig från: 2017-02-15 Skapad: 2017-02-15 Senast uppdaterad: 2017-11-02Bibliografiskt granskad
13. Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing
Öppna denna publikation i ny flik eller fönster >>Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing
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2016 (Engelska)Ingår i: PHOTONICS, ISSN 2304-6732, Vol. 3, nr 2, artikel-id 12Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present an extensive study of equalization enhanced phase noise (EEPN) in coherent optical system for all practical electronic dispersion compensation configurations. It is shown that there are only eight practicable all-electronic impairment mitigation configurations. The non-linear and time variant analysis reveals that the existence and the cause of EEPN depend on the digital signal processing (DSP) schemes. There are three schemes that in principle do not cause EEPN. Analysis further reveals the statistical equivalence of the remaining five system configurations resulting in EEPN. In three of them, EEPN is due to phase noise of the transmitting laser, while in the remaining two, EEPN is caused by the local oscillator. We provide a simple look-up table for the system designer to make an informative decision regarding practicable configuration choice and design.

Ort, förlag, år, upplaga, sidor
MDPI AG, 2016
Nyckelord
coherent receivers, quadrature amplitude modulation (QAM), equalization-enhanced phase noise (EEPN), laser linewidth, optical communication, digital signal processing (DSP), electronic dispersion compensation (EDC)
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:kth:diva-192765 (URN)10.3390/photonics3020012 (DOI)000381860000001 ()
Anmärkning

QC 20160926

Tillgänglig från: 2016-09-26 Skapad: 2016-09-20 Senast uppdaterad: 2017-11-02Bibliografiskt granskad
14. Design of coherent optical systems impaired by EEPN
Öppna denna publikation i ny flik eller fönster >>Design of coherent optical systems impaired by EEPN
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2016 (Engelska)Ingår i: 2016 Optical Fiber Communications Conference and Exhibition, OFC 2016, Institute of Electrical and Electronics Engineers (IEEE), 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We present experimental validation of novel analytical expressions essential for the design of coherent optical systems impaired by EEPN. These expressions enable a simple and accurate EEPN analysis for any system specification. 

Ort, förlag, år, upplaga, sidor
Institute of Electrical and Electronics Engineers (IEEE), 2016
Nyckelord
Optical fibers, Specifications, Analytical expressions, Coherent optical systems, Experimental validations, System specification, Optical fiber communication
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:kth:diva-194977 (URN)000382938100307 ()2-s2.0-84986208236 (Scopus ID)9781943580071 (ISBN)
Konferens
2016 Optical Fiber Communications Conference and Exhibition, OFC 2016, 20 March 2016 through 24 March 2016
Anmärkning

QC 20161110

Tillgänglig från: 2016-11-10 Skapad: 2016-11-01 Senast uppdaterad: 2017-11-06Bibliografiskt granskad
15. Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
Öppna denna publikation i ny flik eller fönster >>Laser Frequency Noise in Coherent Optical Systems: Spectral Regimes and Impairments
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2017 (Engelska)Ingår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, artikel-id 844Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Coherent communication networks are based on the ability to use multiple dimensions of the lightwave together with electrical domain compensation of transmission impairments. Electrical-domain dispersion compensation (EDC) provides many advantages such as network flexibility and enhanced fiber nonlinearity tolerance, but makes the system more susceptible to laser frequency noise (FN), e.g. to the local oscillator FN in systems with post-reception EDC. Although this problem has been extensively studied, statistically, for links assuming lasers with white-FN, many questions remain unanswered. Particularly, the influence of a realistic non-white FN-spectrum due to e.g., the presence of 1/f-flicker and carrier induced noise remains elusive and a statistical analysis becomes insufficient. Here we provide an experimentally validated theory for coherent optical links with lasers having general non-white FN-spectrum and EDC. The fundamental reason of the increased susceptibility is shown to be FN-induced symbol displacement that causes timing jitter and/or inter/intra symbol interference. We establish that different regimes of the laser FN-spectrum cause a different set of impairments. The influence of the impairments due to some regimes can be reduced by optimizing the corresponding mitigation algorithms, while other regimes cause irretrievable impairments. Theoretical boundaries of these regimes and corresponding criteria applicable to system/laser design are provided.

Ort, förlag, år, upplaga, sidor
NATURE PUBLISHING GROUP, 2017
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:kth:diva-206683 (URN)10.1038/s41598-017-00868-4 (DOI)000399186000008 ()28404988 (PubMedID)
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QC 20170510

Tillgänglig från: 2017-05-10 Skapad: 2017-05-10 Senast uppdaterad: 2017-11-02Bibliografiskt granskad
16. Influence of Lasers with Non-White Frequency Noise on the Design of Coherent Optical Links
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2017 (Engelska)Ingår i: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, 2017, artikel-id 7937006Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We experimentally demonstrate for a 28 Gbaud 64-QAM metro link that the LO frequency noise causes timing impairment. Results show the existence of LO frequency noise spectrum regimes where different design criteria apply.

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Telekommunikation
Identifikatorer
urn:nbn:se:kth:diva-207118 (URN)000403405800216 ()2-s2.0-85025835093 (Scopus ID)9781943580231 (ISBN)
Konferens
Optical Fiber Conference OFC
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse
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QC 20170516

Tillgänglig från: 2017-05-16 Skapad: 2017-05-16 Senast uppdaterad: 2017-11-13Bibliografiskt granskad

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Rodrigo Navarro, Jaime
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Optik och Fotonik, OFO
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