1,720,973 research outputs found
Analysis Of Crosstalk Between 10 Gb/s X 64 Channels In Two-pump Fiber Optical Parametric Amplifier
No full textWe present a numerical study of 64 signals amplified by a two-pump fiber optical parametric amplifier. The amplifier was alternatively simulated with two fibers with different values of nonlinear coefficient but the same length. The gain remained constant in both cases. The performance of the amplifier is improved when it is designed with the fiber of lower nonlinear coefficient. Also, it was observed that the performance of the amplifier is strongly dependent on channel separation. © 2012 Wiley Periodicals, Inc.554926929Chavez Boggio, J.M., Marconi, J.D., Bickham, S.R., Fragnito, H.L., Spectrally flat and broadband double-pumped fiber optical parametric amplifiers (2007) Opt Express, 15, pp. 5288-5309Berthold, J., Saleh, A.A.M., Blair, L., Simmons, J.M., Optical networking: Past, present, and future (2008) J Lightwave Technol, 26, pp. 1104-1118Shastri, B.J., Plant, D.V., Scaling technologies for terabist fiber optic transmission systems (2011) Proceedings SPIE, 7942Callegari, F.A., Chavez Boggio, J.M., Fragnito, H.L., Spurious four-wave mixing in two-pump fiber-optic parametric amplifiers (2004) IEEE Photon Technol Lett, 16, pp. 434-436Callegari, F.A., Chavez Boggio, J.M., Marconi, J.D., Guimaraes, A., Fragnito, H.L., Experimental study on crosstalk in double-pumped fiber optic parametric amplifier (2005) Optical Fiber Communication Conference, OFC 2005, Technical Digest, , Anaheim, CA. OFC/NFOEC, 3Jamshidifar, M., Vedadi, A., Marhic, M.E., Reduction of four-wave-mixing crosstalk in a short fiber-optical parametric amplifier (2009) IEEE Photon Technol Lett, 21, pp. 1244-1246Agrawal, G.P., (2001) Nonlinear Fiber Optics, , Academic PressMussot, A., Lantz, E., Durécu-Legrand, A., Simonneau, C., Bayart, D., Maillotte, H., Sylvestre, T., Simple method for crosstalk reduction in fiber optical parametric amplifiers (2007) Opt Commun, 275, pp. 448-452Marcuse, D., Derivation of analytical expressions for the bit-error probability in lightwave systems with optical amplifiers (1990) J Lightwave Technol, 8, pp. 1816-1823Marcuse, D., Calculation of bit-error probability for a lightwave system with optical amplifiers and post-detection Gaussian noise (1991) J Lightwave Technol, 9, pp. 505-513Boggio, J.M.C., Guimaraes, A., Callegari, F.A., Marconi, J.D., Fragnito, H.L., Q penalties due to pump phase modulation and pump RIN in fiber optic parametric amplifiers with non-uniform dispersion (2005) Opt Commun, 249, pp. 451-472Ho, M.-Ch., Marhic, M.E., Wong, K.Y.K., Kazovsky, L.G., Narrow-Linewidth idler generation in fiber four-wave mixing and parametric amplification by dithering two pumps in opposition of phase (2002) J Lightwave Technol, 20, pp. 469-476Pei-Fang, H., Blows, J.L., Four-wave mixing crosstalk in optical fibre parametric amplifiers with orthogonal pumps (2005) Opt Commun, 250, pp. 421-427Chavez Boggio, J.M., Callegari, F.A., Marconi, J.D., Guimaraes, A., Fragnito, H.L., Influence of zero dispersion wavelength variations on cross-talk in single-pumped fiber optic parametric amplifiers (2004) Opt Commun, 242, pp. 471-478Wong, K.K.Y., Lu, G.-W., Chen, L.-K., Experimental studies of the WDM signal crosstalk in two-pump fiber optical parametric amplifiers (2007) Opt Commun, 270, pp. 429-43
High Performance Hybrid Edfa-fopa Pre-amplifier For 40 Gb/s Transmission
No full textWe demonstrated a novel application of a FOPA, i.e. the operation of a hybrid pre-amplifier built with a single-pump FOPA as a second stage of an EDFA pre-amplifier and its application on a 40-Gb/s system. © 2005 Optical Society of America.2989991Chávez Boggio, J.M., Guimarães, A., Callegari, F.A., Marconi, J.D., Rocha, M.L., Debarros, M.R.X., Fragnito, H.L., Parametric amplifier for mid-span phase conjugation with simultaneous compensation of fiber loss and chromatic dispersion at 10Gb/s (2004) Microw. Opt. Technol Lett., 42, pp. 503-505Hansryd, J., Andrekson, P.A., (2001) IEEE Photon. Technol. Lett., 11, pp. 194-196Wong, K.K.Y., Marhic, M.E., Uesaka, K., Kazovsky, L.G., (2002) IEEE Photon. Technol. Lett., 14, pp. 911-913Radic, S., McKinstrie, C.J., Jopson, R.M., Centanni, J.C., Chraplyvy, A.R., Jorensen, G.G., Brar, K., Headley, C., (2003) IEEE Photon. Technol. Lett., 15, pp. 673-675Inoue, K., (2002) J. of Liglhwave Technol., 20, pp. 969-97
Mixing Of Signals In Two-pump Fiber Optic Parametric Amplifiers And Wavelength Converters
No full textWe measure four wave mixing tones generated by two signals within two pump fiber optical parametric amplifiers. Intensities of tones grow with length of fiber and signal power and show little dependence on signal separation. © 2003 Optical Society of America.95 A5355Hansryd, J., Andrekson, P.A., Broad-band continuous-wave-pumped fiber optical parametric amplifier with 49-dB gain and wavelength-conversion efficiency (2001) IEEE Photon. Technol. Lett., 13, pp. 194-196Torounidis, T., Sunnerud, H., Hedekvist, P.O., Andrekson, P.A., Amplification of WDM signals in fiber-based optical parametric amplifiers (2003) IEEE Photon. Technol. Lett., 15, pp. 1061-1063Marhic, M.E., Park, Y., Yang, F.S., Kazovslcy, L.O., Broadband fiber optical parametric amplifiers and wavelength converters with low-ripple Chebyshev gain spectra (1996) Opt. Lett., 21, pp. 1354-1356Chávez Boggio, J.M., Callegari, F.A., Tenenbaum, S., Rosolem, J.B., Debarros, M.R.X., Fragnito, H.L., Demonstration of 26 dB on-off gain of a two-pump fiber optical parametric amplifier Proc. of Optical Fiber Communication Conference, pp. 636-637. , OFC'2002, paper THGG18McKinstrie, C.J., Radic, S., Chraplyvy, A.R., Parametric amplifiers driven by two pump waves (2002) IEEE J Sel. Top. Quant. Electronics., 8, pp. 538-547Krastev, K., Rothman, J., Crosstalk in a fiber parametric amplifier (2001) European Conference on Optical Communication, 1, pp. 84-85. , ECOCBlows, J., Cross talk in a fibre parametric wavelength converter Proc of Optical Fiber Communication Conference, 2, pp. 565-566. , OFC'2003, OSA Technical Diges
Mixing Of Signals In Two-pump Fiber Optic Parametric Amplifiers
No full textWe measure the parasitic four wave mixing tones generated by two signals that are amplified in two-pump fiber optical parametric amplifiers (2P-FOPAs). We consider two parametric amplifiers that use different lengths of fiber and pump powers but have identical parametric gain. We observe that the parasitic tones are stronger in the 2P-FOPA with longer fiber and smaller pump power. This is in agreement with our prediction of crosstalk in 2P-FOPAs.567569Marhic, M.E., Kagi, N., Chiang, T.-K., Kazovsky, L.G., Broadband fiber optical parametric amplifiers (1996) Opt. Lett., 21, pp. 573-575Marhic, M.E., Park, Y., Yang, F.S., Kazovsky, L.G., Broadband fiber optical parametric amplifiers and wavelength converters with low-ripple Chebyshev gain spectra (1996) Opt. Lett., 21, pp. 1354-1356Yang, F.S., Ho, M.C., Marhic, M.E., Kazovsky, L.G., Demonstration of two-pump fibre optical parametric amplification (1997) Electron. Lett., 33, pp. 1812-1813Chavez Boggio, J.M., Callegari, F.A., Tenenbaum, S., Rosolem, J.B., Barros, M.R.X., Fragnito, H.L., Demonstration of 26 dB on-off gain of a two-pump fiber optical parametric amplifier (2002) Optical Fiber Communication Conference, OFC'2002, , OSA Technical Digest (Optical Society of America, Washington, DC), paper WGG-18Radic, S., McKinstrie, C.J., Chraplyvy, A.R., Raybon, G., Centanni, J.C., Jorgensen, C.G., Brar, K., Headley, C., New Class of Continuous Wave Parametric Amplifiers (2002) Optical Fiber Communication Conference, OFC'2002, , OSA Technical Digest (Optical Society of America, Washington, DC), Post-Deadline paper, FB5Hansryd, J., Andrekson, P.A., Broad-Band Continuous-Wave-Pumped Fiber Optical Parametric Amplifier with 49-dB Gain and Wavelength-Conversion Efficiency (2001) IEEE Photon. Technol. Lett., 13, pp. 194-196Chavez Boggio, J.M., Tenenbaum, S., Fragnito, H.L., Amplification of broadband noise pumped by two lasers in optical fibers (2001) J. Opt. Soc. Am. B, 18, pp. 1428-1435Chavez Boggio, J.M., Dainese, P., Fragnito, H.L., Performance of a two-pump fiber optic parametric amplifier in a 10 Gb/s × 64 channel dense wavelength division multiplexing system (2003) Opt. Commun., 218, pp. 303-310Callegari, F.A., Chavez Boggio, J.M., Fragnito, H.L., Crosstalk mitigation in fiber optic parametric amplifiers Laser and Electro-optics Society Annual Meeting, LEOS 2002, pp. 383-384. , conference proceedings, WB3Agrawall, G.P., (2001) Nonlinear Fiber Optics, p. 49. , Academic Pres
Field-trial Demonstration Of A One-pump Fiber Optics Parametric Amplifier With Independent Polarization Gain
No full textWe present a field-trial evaluation of an in-line fiber optical parametric amplifier (FOPA) without polarization dependent gain (PDG). This parametric amplifier uses a polarization diversity technique (PDT) to reduce the PDG to less than 0.05 dB. We analyzed the performance of a system with an in-line FOPA comparing the results of its bit-error-rate (BER) with the BER of a system with an in-line Erbium doped fiber amplifier (EDFA). FOPA presented a power penalty that was 0.7dB higher than the one obtained with the EDFA, showing that the PDG was effectively suppressed with the PDT. © 2011 IEEE.847851Desurvire, E., (2002) Erbium-Doped Amplifiers: Principles and Applications, , New York, USA: John Wiley and SonsDutta, N.K., Wang, Q., (2006) Semiconductor Optical Amplifiers, , Singapore: World Scientific Publishing CompanyHeadley, C., Agrawal, G., (2006) Raman Amplification in Fiber Optical Communication Systems, , San Diego, USA: ElsevierMarhic, M., (2008) Fiber Optical Parametric Amplifiers, Oscillators and Related Devices, , Cambridge, UK: Cambridge University PressTorounidis, T., Andrekson, P.A., Olsson, B.E., Fiber-optical parametric amplifier with 70-dB gain (2006) IEEE Photon. Technol. Lett., 10, pp. 1194-1196. , MayMarhic, M.E., Wong, K.K.Y., Kazovsky, L.G., Wide-band tuning of the gain spectra of one-pump fiber optical parametric amplifiers (2004) IEEE J. Sel. Topics Quantum Electron., 14, pp. 1133-1141Hasegawa, T., Inoue, K., Oda, K., Polarization independent frequency conversion by fiber four-wave mixing with a polarization diversity technique (1993) IEEE Photon. Technol. Lett., 5, pp. 947-949. , AugWong, K.K.Y., Marhic, M.E., Uesaka, K., Kazovsky, L.G., Polarization-independent one-pump fiber-optical parametric amplifier (2002) IEEE Photon. Technol. Lett., 14, pp. 1506-1508. , NovInternational Telecommunication Union - Spectral Grids for WDM Applications: DWDM Frequency Grid - ITU-T G.694.1, , I. T. U(2011), http://www.kyatera.fapesp.br/, MarBoggio, J.M.C., Guimaraes, A., Callegari, F.A., Marconi, J.D., Fragnito, H.L., Q penalties due to pump phase modulation and pump rin in fiber optic parametric amplifiers with non-uniform dispersion (2005) Optics Communications, 249, pp. 451-472. , Ja
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Field-trial Evaluation Of A One-pump Fibre-optics Parametric Amplifier With An Independent Polarization Gain Applied To A Wdm System
No full textA field-trial evaluation of a one-pump fibre optic parametric amplifier with an independent polarization gain is experimentally demonstrated. This independent polarization gain was obtained by using the polarization diversity technique. The device was configured as an in-line amplifier for a wavelength division multiplexed system with 5 signals modulated at 10 Gb/s. The signals were propagated through a 33 km optical network. The optical spectra show the effectiveness of the polarization diversity technique in reducing the polarization induced gain fluctuations. Bit error rate characterizations and eye diagram measurements were performed on the signals. Power penalties of 1.1, 0.75 and 3.5 dB were observed for the selected signals for a bit error rate of 1E9. Our results show the feasibility of this technique applied to parametric amplifiers for all optical network applications. © 2011 IEEE.Vetenskap och Konst (KTH),acreo,Instytut Lacznosci - Panstwowy Instytut Badawczy,Vetenskapsradet,STAD-StockholmBerthold, J., Saleh, A.A.M., Blair, L., Simmons, J.M., Optical networking: Past, present, and future (2008) J. Lightwave Technol., 26 (9), pp. 1104-1118. , MayNamiki, S., Kurosu, T., Tanizawa, K., Kurumida, J., Hasama, T., Ishikawa, H., Nakatogawa, T., Oyamada, K., Ultrahigh-definition video transmission and extremely green optical networks for future IEEE J. Sel. Top. Quantum Electron., , in pressAgrawal, G.P., (2001) Nonlinear Fiber Optics, , 3rd ed. New York: Academic PressJamshidifar, M., Vedadi, A., Marhic, M.E., Continuous-wave one-pump optical parametric amplifier with 270 nm gain bandwidth Proc. ECOC 2009, , paper 587285Torounidis, T., Andrekson, P.A., Olsson, B.E., Fiber-optical parametric amplifier with 70-dB ga (2006) IEEE Photon. Technol. Lett., 10, pp. 1194-1196. , MayWong, K.K.Y., Marhic, M.E., Uesaka, K., Kazovsky, L.G., Polarization-independent one-pump fiberoptical parametric amplifier (2002) IEEE Photon. Technol. Lett., 14, pp. 1506-1508. , Novhttp://kyatera.incubadora.fapesp.br/Mussot, A., Lantz, E., Durécu-Legrand, A., Simonneau, C., Bayart, D., Maillotte, H., Sylvestre, T., Simple methods for crosstalk reduction in fiber optical parametric amplifiers (2007) Opt. Commun., 275, pp. 448-452. , MarChavez Boggio, J.M., Guimaraes, A., Callegari, F.A., Marconi, J.D., Fragnito, H.L., Q penalties due to pump phase modulation and pump RIN in fiber optic parametric amplifiers with non-uniform dispersion (2005) Opt. Commun., 249, pp. 451-472. , Ja
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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