Publicaciones

Found(s) 19 result(s)
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Characterisation of random DFB Raman laser amplifier for WDM transmission

Digital.CSIC. Repositorio Institucional del CSIC
  • Rosa, Pawel
  • Rizzelli, Giuseppe
  • Tan, Mingming
  • Harper, P.
  • Ania Castañón, Juan Diego
6 págs.; 6 figs.; OCIS codes: (060.0060) Fiber optics and optical communications; (060.2320) Fiber optics amplifiers and oscillators., We perform a full numerical characterisation of half-open cavity random DFB Raman fibre laser amplifier schemes for WDM transmission in terms of signal power variation, noise and nonlinear impairments, showcasing the excellent potential of this scheme to provide amplification for DWDM transmission with very low gain variation. © 2015 Optical Society of America, The authors wish to acknowledge the financial support of the EU through the Marie Skł
odowska-Curie IF CHAOS for P. Rosa (658982), FP7 ITN programme ICONE (608099),
UK EPSRC programme UNLOC (EP/J017582/1) and the Spanish MINECO TEC-27314 (RAMAS)
and SINFOTON (S2013/MIT-2790-SINFOTON-CM)., Peer Reviewed




Evaluation of 100G DP-QPSK long-haul transmission performance using second order co-pumped Raman laser based amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Tan, Mingming
  • Rosa, Pawel
  • Le, S.T.
  • Phillips, I.D.
  • Harper, P.
9 págs.; 6 figs.; OCIS codes: (060.1660) Coherent communications; (060.2320) Fiber optics amplifiers and oscillators; (190.5650) Raman effect., We present, for the first time, a detailed investigation of the impact of second order co-propagating Raman pumping on long-haul 100G WDM DP-QPSK coherent transmission of up to 7082 km using Raman fibre laser based configurations. Signal power and noise distributions along the fibre for each pumping scheme were characterised both numerically and experimentally. Based on these pumping schemes, the Q factor penalties versus co-pump power ratios were experimentally measured and quantified. A significant Q factor penalty of up to 4.15 dB was observed after 1666 km using symmetric bidirectional pumping, compared with counter-pumping only. Our results show that whilst using co-pumping minimises the intracavity signal power variation and amplification noise, the Q factor penalty with co-pumping was too great for any advantage to be seen. The relative intensity noise (RIN) characteristics of the induced fibre laser and the output signal, and the intra-cavity RF spectra of the fibre laser are also presented. We attribute the Q factor degradation to RIN induced penalty due to RIN being transferred from the first order fibre laser and second order co-pump to the signal. More importantly, there were two different fibre lasing regimes contributing to the amplification. It was random distributed feedback lasing when using counter-pumping only and conventional Fabry-Perot cavity lasing when using all bidirectional pumping schemes. This also results in significantly different performances due to different laser cavity lengths for these two classes of laser. © 2015 Optical Society of America, This work was funded by UK EPSRC Programme Grant UNLOC (UNLocking the capacity
of Optical Communications) EP/J017582/1 and Marie Skłodowska-Curie IF “CHAOS” (No. 658982)., Peer Reviewed
Proyecto: EC/H2020/658982




Signal power asymmetry optimisation for optical phase conjugation using Raman amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Rosa, Pawel
  • Le, Son T.
  • Rizzelli, Giuseppe
  • Tan, Mingming
  • Ania Castañón, Juan Diego
7 págs.; 8 figs.; OCIS codes: (060.1660) Coherent communications; (060.2320) Fiber optics amplifiers and oscillators; (060.4370) Nonlinear optics, fibers .-- OCIS codes: (060.1660) Coherent communications; (060.2320) Fibre optics amplifiers and
oscillators; (060.4370) Nonlinear optics, fibers., We numerically optimise in-span signal power asymmetry in different advanced Raman amplification schemes, achieving a 3% asymmetry over 62 km SMF using random DFB Raman laser amplifier. We then evaluate the impact of such asymmetry on the performance of systems using mid-link OPC by simulating transmission of 7×15 Gbaud 16QAM Nyquist-spaced WDM-PDM signals. © 2015 Optical Society of America, We acknowledge the support of the EU through the Marie Skłodowska-Curie IF CHAOS for
P. Rosa (658982) and FP7 ITN programme ICONE (608099), Spanish MICINN Grant RAMAS
(TEC2011-27314), SINFOTON (S2013/MIT-2790-SINFOTON-CM) and UK EPSRC Programme Grant UNLOC (EP/J017582/1)., Peer Reviewed




Amplification schemes and multi-channel DBP for unrepeatered transmission

Digital.CSIC. Repositorio Institucional del CSIC
  • Galdino, L.
  • Tan, Mingming
  • Alvarado, Alex
  • Lavery, D.
  • Rosa, Pawel
  • Maher, R.
  • Ania Castañón, Juan Diego
  • Harper, P.
  • Makovejs, S.
  • Thomsen, B.C.
  • Bayvel, P.
7 págs.; 7 figs.; 2 tabs. ; INSPEC Accession Number: 15901947, The performance of unrepeatered transmission of a seven Nyquist-spaced 10 GBd PDM-16QAM superchannel using full signal band coherent detection and multi-channel digital back propagation (MC-DBP) to mitigate nonlinear effects is analysed. For the first time in unrepeatered transmission, the performance of two amplification systems is investigated and directly compared in terms of achievable information rates (AIRs): 1) erbium-doped fibre amplifier (EDFA) and 2) second-order bidirectional Raman pumped amplification. The experiment is performed over different span lengths, demonstrating that, for an AIR of 6.8 bit/s/Hz, the Raman system enables an increase of 93 km (36 %) in span length. Further, at these distances, MC-DBP gives an improvement in AIR of 1 bit/s/Hz (to 7.8 bit/s/Hz) for both amplification schemes. The theoretical AIR gains for Raman and MC-DBP are shown to be preserved when considering low-density parity-check codes. Additionally, MC-DBP algorithms for both amplification schemes are compared in terms of performance and computational complexity. It is shown that to achieve the maximum MC-DBP gain, the Raman system requires approximately four times the computational complexity due to the distributed impact of fibre nonlinearity., The authors would like to thank Corning, Inc., for supplying
the fibre used in this work., Peer Reviewed
Proyecto: EC/H2020/658982




Impact of input FBG reflectivity and forward pump power on RIN transfer in ultralong Raman laser amplifiers

Digital.CSIC. Repositorio Institucional del CSIC
  • Rizzelli, Giuseppe
  • Iqbal, M. A.
  • Gallazzi, Francesca
  • Rosa, Pawel
  • Tan, Mingming
  • Ania Castañón, Juan Diego
  • Krzczanowicz, L.
  • Corredera, Pedro
  • Phillips, I.
  • Forysiak, W.
  • Harper, P.
6 págs.; 6 figs.; OCIS codes: (060.0060) Fiber optics and optical communications; (060.1660) Coherent communications; (060.2320)
Fiber optics amplifiers and oscillators., Relative intensity noise transfer from the pump to the signal in 2nd-order ultra-long Raman laser amplifiers for telecommunications is characterized numerically and experimentally. Our results showcase the need for careful adjustment of the front FBG reflectivity and the relative contribution of forward pump power, and their impact on performance. Finally, our analysis is verified through a 10 x 30 GBaud DP-QPSK transmission experiment, showing a large Q factor penalty associated with the combination of high forward pumping and high reflectivities., FP7 ITN programme ICONE (608099); MSCA-IF ’CHAOS’ (658982) for P. Rosa; Spanish
MINECO grant ANOMALOS (TEC2015-71127-C2); Comunidad de Madrid grant SINFOTON
(S2013/MIT-2790-SINFOTON-CM); UK EPSRC programme grant UNLOC (EP/J017582/1)., Peer Reviewed




Link optimization for DWDM transmission with an optical phase conjugation

Digital.CSIC. Repositorio Institucional del CSIC
  • Rosa, Pawel
  • Rizzelli, Giuseppe
  • Ania Castañón, Juan Diego
6 págs.; 7 figs.; OCIS codes: (060.1660) Coherent communications; (060.2320) Fibre optics amplifiers and oscillators; (060.4370)
Nonlinear optics, fibers., We characterize in-span signal power asymmetry in random distributed feedback ultralong Raman laser-amplified WDM transmission and numerically optimize fiber span length and operating band to achieve the lowest inter-span signal power asymmetry between transmitted and optically conjugated channels in systems relying upon mid-link optical conjugation to combat fiber nonlinear impairments. © 2016 Optical Society of America, Marie Skłodowska-Curie IF CHAOS for P. Rosa (658982); FP7 ITN programme ICONE
(608099); Spanish MINECO grant ANOMALOS (TEC2015-71127-C2); Comunidad de Madrid
grant SINFOTON (S2013/MIT-2790-SINFOTON-CM)., Peer Reviewed




Nonlinear inverse synthesis for optical links with distributed Raman amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Le, Son T.
  • Prilepsky, Jaroslaw E.
  • Rosa, Pawel
  • Ania Castañón, Juan Diego
  • Turitsyn, Sergei K.
9 págs. 9 figs., Nonlinear Fourier transform (NFT) and eigenvalue communication with the use of nonlinear signal spectrum (both discrete and continuous) have been recently discussed as a promising transmission method to combat fiber nonlinearity impairments. However, because the NFT-based transmission method employs the integrability property of the lossless nonlinear Schrödinger equation (NLSE), the original approach can only be applied directly to optical links with ideal distributed Raman amplification. In this paper, we investigate in details the impact of a non-ideal Raman gain profile on the performance of the nonlinear inverse synthesis (NIS) scheme, in which the transmitted information is encoded directly onto the continuous part of the nonlinear signal spectrum.We propose the lossless path-averaged (LPA) model for fiber links with non-ideal Raman gain profile by taking into account the average effect of the Raman gain.We show that the NIS scheme employing the LPA model can offer a performance gain of 3 dB regardless of the Raman gain profiles., This work was supported by the UK EPSRC Grant UNLOC (EP/J017582/1). P. Rosa kindly acknowledges the support of the EU Marie Skłodowska-Curie IF CHAOS (658982) project, Peer Reviewed
Proyecto: EC/H2020/658982




Transmission performance improvement using random DFB laser based Raman amplification and bidirectional second-order pumping

Digital.CSIC. Repositorio Institucional del CSIC
  • Tan, Mingming
  • Rosa, Pawel
  • Le, S.T.
  • Iqbal, M. A.
  • Phillips, I.D.
  • Harper, P.
7 págs.; 5 figs.; OCIS codes: (060.1660) Coherent communications; (060.2320) Fiber optics amplifiers and oscillators; (190.5650) Raman effect., We demonstrate that a distributed Raman amplification scheme based on random distributed feedback (DFB) fiber laser enables bidirectional second-order Raman pumping without increasing relative intensity noise (RIN) of the signal. This extends the reach of 10 × 116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with conventional Raman amplification schemes. Moreover, this scheme gives the longest maximum transmission distance among all the Raman amplification schemes presented in this paper, whilst maintaining relatively uniform and symmetric signal power distribution, and is also adjustable in order to be highly compatible with different nonlinearity compensation techniques, including mid-link optical phase conjugation (OPC) and nonlinear Fourier transform (NFT). © 2016 Optical Society of America, The work was funded by UK EPSRC programme grant UNLOC (EP/J017582/1), MSC IF
grant CHAOS (No. 658982), and FP7 ITN programme ICONE (No. 608099)., Peer Reviewed




Dataset CHAOS project, Nonlinear compensation in hybrid Raman/EDFA amplified optical systems

Digital.CSIC. Repositorio Institucional del CSIC
  • Ania Castañón, Juan Diego
  • Rosa, Pawel
  • Corredera, Pedro
  • Rizzelli, Giuseppe
  • Gallazzi, Francesca
Project Number: 658982 ; Project Acronym: CHAOS ; Topic: MSCA-IF-2014-EF - Marie Skłodowska-Curie Individual Fellowships (IF-EF) ; From 2015-04-01 to 2017-03-31, closed project, Data set collecting the list of publications obtained within the CHAOS project, identifiying the relevant DOI or open-access references for the corresponding publications., No
Proyecto: EC/H2020/658982




FBG reflectivity impact on RIN in ultralong laser amplifiers

Digital.CSIC. Repositorio Institucional del CSIC
  • Rizzelli, Giuseppe
  • Iqbal, M. A.
  • Gallazzi, Francesca
  • Rosa, Pawel
  • Tan, Mingming
  • Corredera, Pedro
  • Ania Castañón, Juan Diego
  • Harper, Paul
42nd European Conference on Optical Communication, Dusseldorf, Germany,
18-22 Sept. 2016 http://ieeexplore.ieee.org/document/7767668/, We analyse, both numerically and experimentally, the relative intensity noise transfer in ultra-long Raman laser amplifiers isolating the combined effect of front-FBG reflectivity and pump power split and quantitatively showing their impact on a 100 km, 2nd-order, bidirectionally pumped configuration., This work was funded by FP7 ITN programme ICONE (608099), Spanish grants ANOMALOS (TEC2015-71127-C2) and SINFOTON (S2013/MIT-2790-SINFOTON-CM)., Peer Reviewed




Link optimisation for DWDM transmission with an optical phase conjugation

Digital.CSIC. Repositorio Institucional del CSIC
  • Rosa, Pawel
  • Rizzelli, Giuseppe
  • Ania Castañón, Juan Diego
6 pags., 6 figs. .-- OCIS codes: (060.1660) Coherent communications; (060.2320) Fibre optics amplifiers and
oscillators; (060.4370) Nonlinear optics, fibers. .-- 18th International Conference on Transparent Optical Networks (ICTON), Trento, Italy, 10-14 July 2016, We numerically optimise the span length that gives the lowest signal power asymmetry between transmitted and conjugated channels in a DWDM transmission with fibre based mid-link optical phase conjugation., We acknowledge the support of the EU through the Marie Skłodowska-Curie IF CHAOS for P. Rosa (658982) and FP7 ITN programme ICONE (608099), Spanish MINECO grant ANOMALOS (TEC2015-71127-C2) and Comunidad de Madrid grant SINFOTON (S2013/MIT-2790-SINFOTON-CM)., Peer Reviewed




The role of distributed Raman amplification in the times of the 'capacity crunch'

Digital.CSIC. Repositorio Institucional del CSIC
  • Ania Castañón, Juan Diego
  • Rosa, Pawel
  • Rizzelli, Giuseppe
  • Gallazzi, Francesca
  • Nuño, Javier
  • Corredera, Pedro
Conferencia invitada ; 18th International Conference on Transparent Optical Networks, Trento, Italy, July 10th-14th, 2016, Distributed Raman amplification has different roles to play in combination with of a range of potential solutions to deal with the nonlinear Shannon limit. Here, we will cover issues such as asymmetry optimisation for optical-phase conjugation nonlinear compensation, the combination of optimised distributed amplification with digital nonlinear compensation techniques and the challenges of adopting high-spectral density formats while still making use of all the possible available bandwidth. Some examples are drawn from recent results from the past few years., The authors wish to acknowledge the financial support of the EU through the FP7 ITN programme ICONE (608099), the Marie Sklodowska-Curie individual fellowship ‘CHAOS’ (658982), as well as Spanish grants ANOMALOS (TEC2015-71127-C2) and SINFOTON (S2013/MIT-2790-SINFOTON-CM)., Peer Reviewed




Modified nonlinear inverse synthesis for optical links with distributed Raman amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Le, Son T.
  • Prilepsky, Jaroslaw E.
  • Kamalian, M.
  • Rosa, Pawel
  • Tan, Mingming
  • Ania Castañón, Juan Diego
  • Harper, Paul
3 pags., 5 figs. .-- 2015 European Conference on Optical Communication (ECOC), Valencia, Spain, 27 Sept.-1 Oct. 2015, We propose a modification of the nonlinear digital signal processing technique based on the nonlinear inverse synthesis for the systems with distributed Raman amplification. The proposed path-average approach offers 3 dB performance gain, regardless of the signal power profile., This work was supported by UK EPSRC Grant
UNLOC (EP/J017582/1) and H2020 Grant
CHAOS (658982)., Peer reviewed
Proyecto: EC/H2020/658982




Optimisation of random DFB Raman laser amplifier

Digital.CSIC. Repositorio Institucional del CSIC
  • Rosa, Pawel
  • Rizzelli, Giuseppe
  • Tan, Mingming
  • Ania Castañón, Juan Diego
4 pags., 5 figs. .--17th International Conference on Transparent Optical Networks (ICTON), Budapest, Hungary, 5-9 July 2015, We numerically optimise 2nd-order random DFB Raman laser amplifiers for transmission for the first time. Optical signal to noise ratio, nonlinear phase shift, signal power variation and the impact of the reflectivity of FBG are investigated in the links from 10 - 120 km., The authors wish to acknowledge the financial support of the EU through the Marie Skłodowska-Curie individual fellowship ‘CHAOS’ (No. 658982) for P. Rosa, FP7 ITN programme ICONE, and the Spanish MINECO through grant TEC-27314 (RAMAS)., Peer reviewed




Impact of front-FBG reflectivity in raman fiber laser based amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Rizzelli, Giuseppe
  • Iqbal, M. A.
  • Rosa, Pawel
  • Tan, Mingming
  • Krzczanowicz, L.
  • Phillips, I.
  • Forysiak, W.
  • Ania Castañón, Juan Diego
  • Harper, Paul
2 pags., 3 figs. .-- OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (060.2330) Fiber optics communications. .-- CLEO: Science and Innovations, San Jose, California United States, 5–10 June 2016, We experimentally analyze the impact of front-FBG reflectivity in ultra-long Raman laser amplifiers performance, showing Q-factor penalties in excess of 1 dB for FBG reflectivities above 10% in a 30 GBaud DP-QPSK transmission system., Peer reviewed
Proyecto: EC/H2020/658982




Signal power asymmetry optimisation for optical phase conjugation using random DFB laser Raman amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Rosa, Pawel
  • Le, Son T.
  • Rizzelli, Giuseppe
  • Tan, Mingming
  • Ania Castañón, Juan Diego
3 pags., 3 figs. -- Asia Communications and Photonics Conference, Hong Kong Hong Kong
19–23 November 2015 .-- OCIS codes: 060.2320, 060.1660, We numerically optimise in-span signal power asymmetry in advanced Raman amplification schemes, reaching 3% over 62 km SMF, and evaluate its impact on the performance of systems using mid-link OPC using 7×15 16QAM Nyquist-spaced WDM-PDM., We acknowledge the support of the EU through the MSC IF ”CHAOS” and FP7 ITN programme ICONE, Spanish MICINN Grant RAMAS, TEC2011-27314 and UK EPSRC Programme Grant UNLOC EP/J017582/1., Peer reviewed




RIN mitigation in second-order pumped raman fibre laser based amplification

Digital.CSIC. Repositorio Institucional del CSIC
  • Tan, Mingming
  • Iqbal, M. A.
  • Phillips, I.
  • Nuño, Javier
  • Ania Castañón, Juan Diego
  • Harper, Paul
Asia Communications and Photonics Conference, Hong Kong Hong Kong
19–23 November 2015, We experimentally investigate three Raman fibre laser based amplification techniques with second-order bidirectional pumping. Relatively intensity noise (RIN) being transferred to the signal can be significantly suppressed by reducing first-order reflection near the input end., Peer Reviewed
Proyecto: EC/H2020/658982




Extended reach of 116 Gb/s DP-QPSK transmission using random DFB fiber laser based raman amplification and bidirectional second-order pumping

Digital.CSIC. Repositorio Institucional del CSIC
  • Tan, Mingming
  • Rosa, Pawel
  • Phillips, I.
  • Harper, Paul
Resumen del trabajo presentado a la Optical Fiber Communication Conference, celebrada en Los Angeles, California (US) del 22 al 26 de marzo de 2015., We propose a novel random DFB fiber laser based Raman amplification using bidirectional second-order pumping. This extends the reach of 116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with other Raman amplification techniques., This work was funded by UK EPSRC Programme Grant UNLOC EP/J017582/1., Peer reviewed
Proyecto: EC/H2020/658982




Metal-free [2 + 2]-photocycloaddition of (Z)-4-aryliden-5(4H)-oxazolones as straightforward synthesis of 1,3-diaminotruxillic acid precursors: Synthetic scope and mechanistic studies

Digital.CSIC. Repositorio Institucional del CSIC
  • García-Montero, Ángel
  • Rodríguez-García, Antonio M.
  • Juan, Alberto
  • Velders, Aldrik H.
  • Denisi, Antonio
  • Jiménez-Osés, Gonzalo
  • Gómez-Bengoa, Enrique
  • Cativiela, Carlos
  • Gómez, M. Victoria
  • Urriolabeitia, Esteban P.
The direct [2 + 2]-photocycloaddition of (Z)-2-phenyl-4-aryliden-5(4H)-oxazolones 1 to give 1,3-diaminotruxillic cyclobutane derivatives 2 in very good yields (75-100%) is reported. The reaction takes place by irradiation of CHCl solutions of 1 with blue light (465 nm) provided by light-emitting diode (LED) lamps of low power (around 1 W) for 72 h. Four isomers of the 1,3-diaminotruxillic cyclobutanes 2 were obtained; all of them fully characterized by a combination of nuclear magnetic resonance (NMR) spectroscopy and X-ray diffraction analysis. The reaction shows a certain selectivity, since one of the isomers (the epsilon) is obtained preferentially, and works for electron-releasing and electron-withdrawing substituents at the arylidene ring. A novel setup is presented for the in-line monitoring of the continuous flow photoassisted synthesis of the cyclobutane derivatives 2 by NMR spectroscopy, with the microreactor dramatically reducing reaction times to only 30 min with clear product distribution of up to four isomers. The mechanism of this [2 + 2]-photocycloaddition has been calculated by density functional theory (DFT) methods, explaining all experimental findings. The reaction takes place through a stepwise formation of two new C-C bonds through a transient diradical singlet intermediate. The isomeric distribution of the final products is not due to equilibration processes but instead reflects the kinetic preference during the rate limiting C-C bond formation step., C. C. and E. P. U. thank Ministerio de Economía, Industria y Competitividad (Spain, Project CTQ2013-40855R) and Gobierno de Aragón - Fondo Social Europeo (Spain, groups E-40 and E-97) for financial support. C. C. and E. P. U. also would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza. E. P. U. and E. G. B. thank COST program under CA15106 (CHAOS) grant. M. V. G. acknowledges Spanish Ministry of Economy, Industry and Competitivity (MINECO CTQ2014-54987-P) for financial support and for participation in the Ramón y Cajal program., Peer Reviewed