Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323324
F. Matera
This paper reports an analytical investigation, confirmed by numerical simulations, about the nonlinear noise impact on the performance of single-channel systems adopting generic modulation-detection formats and operating in long links with both managed and unmanaged dispersion compensation. Such a noise contribution is analyzed in terms of a pulse nonlinear interaction length, that depends on the link dispersion characteristics and on the modulation-detection format.
{"title":"Nonlinear noise characterization in highly dispersive optical transmission systems","authors":"F. Matera","doi":"10.1109/TIWDC.2015.7323324","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323324","url":null,"abstract":"This paper reports an analytical investigation, confirmed by numerical simulations, about the nonlinear noise impact on the performance of single-channel systems adopting generic modulation-detection formats and operating in long links with both managed and unmanaged dispersion compensation. Such a noise contribution is analyzed in terms of a pulse nonlinear interaction length, that depends on the link dispersion characteristics and on the modulation-detection format.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125507202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323333
Akifumi Toyota, A. Maruta
Wavelength division multiplexing is essential for achieving large capacity optical fiber transmission for any kind of modulation format. In this paper, we propose a wavelength division multiplexed optical eigenvalue modulated system and discuss its advantages and remaining issues for practical application.
{"title":"Wavelength division multiplexed optical eigenvalue modulated system","authors":"Akifumi Toyota, A. Maruta","doi":"10.1109/TIWDC.2015.7323333","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323333","url":null,"abstract":"Wavelength division multiplexing is essential for achieving large capacity optical fiber transmission for any kind of modulation format. In this paper, we propose a wavelength division multiplexed optical eigenvalue modulated system and discuss its advantages and remaining issues for practical application.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123682056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323335
V. Vercesi, G. Serafino, A. Bogoni, C. Porzi
All-optical phase-preserving amplitude regeneration is an effective method to reduce nonlinear phase noise in long-haul transmission of phase-modulated signals. Here we review the latest results on a proposed differential phase shift keying (DPSK) regeneration scheme exploiting a compact architecture based on a saturated semiconductor optical amplifier. The scheme allows for amplitude-only signal regeneration with limited excess phase-noise contribution. Both the pass-through (PT) and the four wave mixing (FWM) signals exhibit enhanced Q-factor and margin improvement in bit error rate vs receiver threshold measurements, making the configuration suitable for both wavelength-preserving optical regeneration and wavelength regenerative conversion. The regeneration through FWM has an higher resilience to noise than the PT and its polarization dependency can be eliminated with the implementation of a dual co-polarized pump scheme. Preliminary experiments of simultaneous regeneration of two DPSK data streams are also provided.
{"title":"Review on phase preserving amplitude regeneration for phase-coded signals exploiting FWM in a saturated SOA","authors":"V. Vercesi, G. Serafino, A. Bogoni, C. Porzi","doi":"10.1109/TIWDC.2015.7323335","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323335","url":null,"abstract":"All-optical phase-preserving amplitude regeneration is an effective method to reduce nonlinear phase noise in long-haul transmission of phase-modulated signals. Here we review the latest results on a proposed differential phase shift keying (DPSK) regeneration scheme exploiting a compact architecture based on a saturated semiconductor optical amplifier. The scheme allows for amplitude-only signal regeneration with limited excess phase-noise contribution. Both the pass-through (PT) and the four wave mixing (FWM) signals exhibit enhanced Q-factor and margin improvement in bit error rate vs receiver threshold measurements, making the configuration suitable for both wavelength-preserving optical regeneration and wavelength regenerative conversion. The regeneration through FWM has an higher resilience to noise than the PT and its polarization dependency can be eliminated with the implementation of a dual co-polarized pump scheme. Preliminary experiments of simultaneous regeneration of two DPSK data streams are also provided.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114485713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323334
Mengdi Song, E. Pincemin, V. Vgenopoulou, I. Roudas, El-Mehdi Amhoud, Y. Jaouën
We experimentally study the transmission of a 400 Gbps coherent 16-QAM multi-band OFDM superchannel over a 10×100 km G.652 fibre-based WDM transmission line. We investigate the performance of Volterra-based and digital back-propagation-based nonlinear equalizers over three scenarios with different quantities of inter-channel nonlinearities.
实验研究了400 Gbps相干16-QAM多频带OFDM超级信道在10×100 km G.652光纤WDM传输线上的传输。我们研究了基于volterra和基于数字反向传播的非线性均衡器在三种不同信道间非线性的情况下的性能。
{"title":"Transmission performances of 400 Gbps coherent 16-QAM multi-band OFDM adopting nonlinear mitigation techniques","authors":"Mengdi Song, E. Pincemin, V. Vgenopoulou, I. Roudas, El-Mehdi Amhoud, Y. Jaouën","doi":"10.1109/TIWDC.2015.7323334","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323334","url":null,"abstract":"We experimentally study the transmission of a 400 Gbps coherent 16-QAM multi-band OFDM superchannel over a 10×100 km G.652 fibre-based WDM transmission line. We investigate the performance of Volterra-based and digital back-propagation-based nonlinear equalizers over three scenarios with different quantities of inter-channel nonlinearities.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"182 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123289458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323330
P. Poggiolini, G. Bosco, A. Carena, V. Curri, Y. Jiang, S. M. Bilal, A. Nespola, L. Bertignono, S. Abrate, F. Forghieri
We investigated the reach increase obtained through non-linearity mitigation by means of transmission symbol rate optimization (SRO). First, we did this theoretically and simulatively. We found that for PM-QPSK systems at full-C-band the reach increase may be substantial, on the order of 10%-25%, with optimum symbol rates on the order of 2-to-6 GBaud. We extended the investigation to PM-16QAM, where we found a qualitatively similar effect, although the potential reach increase is typically only about half that of PM-QPSK. We then set up an experiment to obtain confrmation of the theoretical and simulative predictions. We demonstrated a reach increase of 11% in a 19-channel, 128 Gbit/s per channel, PM-QPSK experiment, when going from single-carrier to multi-subcarrier (up to 16 subcarriers per channel) transmission. The experiment reached 14,100 km over PSCF, with 110 km spans and EDFA-only amplifcation. The results matched well the EGN model predictions.
{"title":"Theoretical and experimental assessment of nonlinearity mitigation through symbol rate optimization","authors":"P. Poggiolini, G. Bosco, A. Carena, V. Curri, Y. Jiang, S. M. Bilal, A. Nespola, L. Bertignono, S. Abrate, F. Forghieri","doi":"10.1109/TIWDC.2015.7323330","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323330","url":null,"abstract":"We investigated the reach increase obtained through non-linearity mitigation by means of transmission symbol rate optimization (SRO). First, we did this theoretically and simulatively. We found that for PM-QPSK systems at full-C-band the reach increase may be substantial, on the order of 10%-25%, with optimum symbol rates on the order of 2-to-6 GBaud. We extended the investigation to PM-16QAM, where we found a qualitatively similar effect, although the potential reach increase is typically only about half that of PM-QPSK. We then set up an experiment to obtain confrmation of the theoretical and simulative predictions. We demonstrated a reach increase of 11% in a 19-channel, 128 Gbit/s per channel, PM-QPSK experiment, when going from single-carrier to multi-subcarrier (up to 16 subcarriers per channel) transmission. The experiment reached 14,100 km over PSCF, with 110 km spans and EDFA-only amplifcation. The results matched well the EGN model predictions.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125820943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323322
P. Serena, A. Bononi
We provide an analytical expression of the nonlinear phase induced by the Kerr effect that highlights its dependence on the modulation format and on the link parameters. We show that such a nonlinear phase must be used in regular-perturbation models in order to minimize their modeling error. We detail the case of dispersion-managed systems as an application example.
{"title":"On the nonlinear reference phase in regular perturbation models","authors":"P. Serena, A. Bononi","doi":"10.1109/TIWDC.2015.7323322","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323322","url":null,"abstract":"We provide an analytical expression of the nonlinear phase induced by the Kerr effect that highlights its dependence on the modulation format and on the link parameters. We show that such a nonlinear phase must be used in regular-perturbation models in order to minimize their modeling error. We detail the case of dispersion-managed systems as an application example.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127763700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323329
A. Maruta, Akifiimi Toyota, Y. Matsuda, Yoshinori Ikeda
Eigenvalues of the associated equation of the nonlinear Schrödinger equation are mathematically invariable. We experimentally demonstrate the eigenvalues can be almost conserved for longer than 1,500km in wavelength division multiplexed optical fiber transmission line for the first time.
{"title":"Experimental demonstration of long haul transmission of eigenvalue modulated signals","authors":"A. Maruta, Akifiimi Toyota, Y. Matsuda, Yoshinori Ikeda","doi":"10.1109/TIWDC.2015.7323329","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323329","url":null,"abstract":"Eigenvalues of the associated equation of the nonlinear Schrödinger equation are mathematically invariable. We experimentally demonstrate the eigenvalues can be almost conserved for longer than 1,500km in wavelength division multiplexed optical fiber transmission line for the first time.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"61 13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116693036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323331
T. Fehenberger, N. Hanik, T. Eriksson, P. Johannisson, M. Karlsson
Carrier phase estimation (CPE) is an integral part of the digital signal processing (DSP) of coherent optical communication systems as it compensates laser phase noise (LPN) introduced by free-running transmitter and local oscillating (LO) lasers. Nonlinear interactions during propagation are another source of correlated phase noise. In this paper, we show through simulations and in experiments that blind decision-directed (DD) CPE with regular block lengths removes a large portion of the memory. This makes it virtually impossible in practice to quantify correlations that come from propagation effects, or to obtain rate gains by exploiting the nonlinear phase noise (NLPN). Larger CPE block lengths leave the memory partly intact. This, however, comes at the expense of reduced information rates. We are able to fully recover this rate loss in simulations by using idealized processing of phase distortions. In experiments with full DSP, an almost full rate recovery is reported.
{"title":"On the impact of carrier phase estimation on phase correlations in coherent fiber transmission","authors":"T. Fehenberger, N. Hanik, T. Eriksson, P. Johannisson, M. Karlsson","doi":"10.1109/TIWDC.2015.7323331","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323331","url":null,"abstract":"Carrier phase estimation (CPE) is an integral part of the digital signal processing (DSP) of coherent optical communication systems as it compensates laser phase noise (LPN) introduced by free-running transmitter and local oscillating (LO) lasers. Nonlinear interactions during propagation are another source of correlated phase noise. In this paper, we show through simulations and in experiments that blind decision-directed (DD) CPE with regular block lengths removes a large portion of the memory. This makes it virtually impossible in practice to quantify correlations that come from propagation effects, or to obtain rate gains by exploiting the nonlinear phase noise (NLPN). Larger CPE block lengths leave the memory partly intact. This, however, comes at the expense of reduced information rates. We are able to fully recover this rate loss in simulations by using idealized processing of phase distortions. In experiments with full DSP, an almost full rate recovery is reported.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116179225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323337
K. Kojima, T. Koike-Akino, D. Millar, K. Parsons
We investigate the nonlinear performance of 8QAM-alternative 4D modulation format using GMI to evaluate the BICM capacity. Due to its constant modulus feature, the 4D-2A8PSK modulation has higher nonlinear threshold than Star-8QAM and Circular-8QAM.
{"title":"BICM capacity analysis of 8QAM-alternative modulation formats in nonlinear fiber transmission","authors":"K. Kojima, T. Koike-Akino, D. Millar, K. Parsons","doi":"10.1109/TIWDC.2015.7323337","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323337","url":null,"abstract":"We investigate the nonlinear performance of 8QAM-alternative 4D modulation format using GMI to evaluate the BICM capacity. Due to its constant modulus feature, the 4D-2A8PSK modulation has higher nonlinear threshold than Star-8QAM and Circular-8QAM.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132924191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-12DOI: 10.1109/TIWDC.2015.7323332
R. Rath, W. Rosenkranz
Digital back-propagation (DBP) was shown to have the potential to become the most promising method for compensation of fiber nonlinearities. However, apart from its high computational effort, the performance of DBP is dependent on the knowledge of the transmission link, i.e. the link's dispersion map as well as its power profile. In this contribution, we investigate the performance of DBP under the assumption of an imperfect link-design knowledge, and discuss its implications in an optical network scenario.
{"title":"On the performance of digital back-propagation for imperfect knowledge of link design","authors":"R. Rath, W. Rosenkranz","doi":"10.1109/TIWDC.2015.7323332","DOIUrl":"https://doi.org/10.1109/TIWDC.2015.7323332","url":null,"abstract":"Digital back-propagation (DBP) was shown to have the potential to become the most promising method for compensation of fiber nonlinearities. However, apart from its high computational effort, the performance of DBP is dependent on the knowledge of the transmission link, i.e. the link's dispersion map as well as its power profile. In this contribution, we investigate the performance of DBP under the assumption of an imperfect link-design knowledge, and discuss its implications in an optical network scenario.","PeriodicalId":126687,"journal":{"name":"2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134064873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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