The Experts below are selected from a list of 885351 Experts worldwide ranked by ideXlab platform
Masataka Nakazawa - One of the best experts on this subject based on the ideXlab platform.
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320 gbit s 20 gsymbol s 256 qam coherent transmission over 160 km by using injection locked local oscillator
Optics Express, 2016Co-Authors: Yixin Wang, Keisuke Kasai, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate 20 Gsymbol/s, 256 QAM polarization multiplexed (pol-mux) 320 Gbit/s coherent transmission. By employing an LD-based injection locking circuit, we achieved low noise optical carrier-phase locking between the LO and the Data Signal. Furthermore, frequency domain equalization and digital back-propagation enabled us to realize precise compensation for transmitted waveform distortions. As a result, a 320 Gbit/s Data was successfully transmitted over 160 km with a potential spectral efficiency of 10.9 bit/s/Hz. This is the highest symbol rate yet achieved in a pol-mux 256 QAM coherent transmission. In addition, we also describe a pol-mux 256 QAM transmission at a symbol rate of 10 Gsymbol/s.
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256 qam polarization multiplexed 5 gsymbol s coherent transmission with an injection locked homodyne detection technique
Optical Fiber Communication Conference, 2015Co-Authors: Keisuke Kasai, Yixin Wang, Shohei Beppu, Masataka NakazawaAbstract:We demonstrate an 80 Gbit/s-256 QAM coherent optical transmission with a fiber laser-based injection-locked homodyne detection circuit. The circuit enabled low phase-noise carrier-phase synchronization, and an 80-Gbit/s Data Signal was successfully transmitted over 150 km.
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140 gbit s 128 qam ld based coherent transmission over 150 km with an injection locked homodyne detection technique
2014 Asia Communications and Photonics Conference (ACP), 2014Co-Authors: Yixin Wang, Keisuke Kasai, Masato Yoshida, Shohei Beppu, Masataka NakazawaAbstract:We demonstrate a 140-Gbit/s, 128 QAM coherent optical transmission employing an LD-based injection-locked homodyne detection circuit. Low phase noise carrier-phase synchronization was achieved and a 140-Gbit/s Data Signal was successfully transmitted over 150 km.
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single channel 1 92 tbit s pol mux 64 qam coherent nyquist pulse transmission over 150 km with a spectral efficiency of 7 5 bit s hz
Optics Express, 2014Co-Authors: David Odeke Otuya, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka NakazawaAbstract:Coherent Nyquist pulses have been used for optical time division multiplexed (OTDM) digital coherent transmission, and a single-channel 1.92 Tbit/s, Pol-Mux-64 QAM coherent Nyquist pulse transmission over 150 km is demonstrated. The ability to considerably reduce the spectral bandwidth of the Data Signal enabled us to increase the spectral efficiency from 3.2 bit/s/Hz to 7.5 bit/s/Hz when using a Gaussian pulse train.
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polarization multiplexed 10gsymbol s 64qam coherent transmission over 150km with opll based homodyne detection employing narrow linewidth lds
IEICE Electronics Express, 2011Co-Authors: Yixin Wang, Keisuke Kasai, Masataka NakazawaAbstract:We report a polarization-multiplexed 10Gsymbol/s, 64QAM (120Gbit/s) coherent transmission over 150km by using an optical phase-locked loop (OPLL) circuit employing narrow linewidth LDs. The OPLL realized low phase noise demodulation of 64QAM Signal. As a result, 120Gbit/s Data Signal were transmitted with a bit error rate (BER) performance below a forward error correction (FEC) threshold of 2×10-3.
Alan E Willner - One of the best experts on this subject based on the ideXlab platform.
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tunable homodyne detection using nonlinear optical Signal processing to automatically lock a local pump laser to an incoming 20 to 40 gbaud qpsk Data Signal
European Conference on Optical Communication, 2014Co-Authors: Mohammad Reza Chitgarha, Amirhossei Mohajerinariaei, Morteza Ziyadi, Salma Khaleghi, Joseph D Touch, Carste Langrock, M M Fejer, Ahmed Almaiman, Yinwen Cao, Alan E WillnerAbstract:We propose and demonstrate tunable homodyne detection using nonlinear optical Signal processing to automatically lock a “local” pump laser to an incoming 20-to-40-Gbaud QPSK Data Signal. Open eyes are obtained for both in-phase and quadrature components of the Signal after ~200km transmission over SMF-28 and DCF fibers. The BER performance of the proposed homodyne detection scheme is also compared with the conventional intradyne receiver.
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all optical chromatic dispersion monitoring of a 40 gb s rz Signal by measuring the xpm generated optical tone power in a highly nonlinear fiber
IEEE Photonics Technology Letters, 2006Co-Authors: Changyuan Yu, Y Wang, J E Mcgeehan, M Adler, Alan E WillnerAbstract:We experimentally demonstrate an all-optical chromatic dispersion (CD) monitoring technique potential for ultrahigh-speed systems. A monochromatic continuous wave probe is coupled with the tapped-off Data Signal into a highly nonlinear fiber. An optical tone that is sensitive to CD is generated near the probe wavelength due to the cross-phase modulation effect and is used for CD monitoring. The monitoring window is /spl plusmn/42 ps/nm for 40-Gb/s return-to-zero systems. This monitoring technique is simple and needs no modification at the transmitter.
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online chromatic dispersion monitoring and compensation using a single inband subcarrier tone
IEEE Photonics Technology Letters, 2002Co-Authors: M N Petersen, Zhongqi Pan, S Lee, S A Havstad, Alan E WillnerAbstract:In this letter, we demonstrate a simple technique for dispersion monitoring by adding a single inband subcarrier tone to the transmitted Data Signal. A measurable dispersion of up to 1200 ps/nm is demonstrated in a 10-Gb/s channel using a 7-9 GHz subcarrier and the addition of the subcarrier induced a power penalty of <0.5 dB. Dynamic ranges exceeding 20 dB and resolution sensitivities better than 10 (ps/nm)/dB are shown. With an 8-GHz tone and a 15% modulation depth for 10-Gb/s Signals, we show a measurement range of 975 ps/nm with a 22-dB dynamic range. We used the monitor output Signal to achieve accurate tunable dispersion compensation.
Leif Katsuo Oxenlowe - One of the best experts on this subject based on the ideXlab platform.
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640 gbit s return to zero to non return to zero format conversion based on optical linear spectral phase filtering
Optics Letters, 2016Co-Authors: Reza Maram, Michael Galili, Leif Katsuo Oxenlowe, Deming Kong, Jose AzanaAbstract:We propose a novel approach for all-optical return-to-zero (RZ) to non-return-to-zero (NRZ) telecommunication Data format conversion based on linear spectral phase manipulation of an RZ Data Signal. The operation principle is numerically analyzed and experimentally validated through successful format conversion of a 640 Gbit/s coherent RZ Signal into the equivalent NRZ time-domain Data using a simple phase filter implemented by a commercial optical waveshaper.
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demonstration of 5 1 tbit s Data capacity on a single wavelength channel
Optics Express, 2010Co-Authors: Hans Christian Hansen Mulvad, Michael Galili, A T Clausen, Hao Hu, Leif Katsuo Oxenlowe, Jesper Bevensee Jensen, Christophe Peucheret, P JeppesenAbstract:We have generated a single-wavelength Data Signal with a Data capacity of 5.1 Tbit/s. The enabling techniques to generate the Data Signal are optical time-division multiplexing up to a symbol rate of 1.28 Tbaud, differential quadrature phase shift keying as Data format, and polarisation-multiplexing. For the first time, error-free performance with a bit error rate less than 10−9 is demonstrated for the 5.1 Tbit/s Data Signal. This is achieved in a back-to-back configuration using a direct detection receiver based on polarisation- and time-demultiplexing, delay-demodulation and balanced photo-detection.
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1 28 tbit s single polarisation serial ook optical Data generation and demultiplexing
Electronics Letters, 2009Co-Authors: Hans Christian Hansen Mulvad, Michael Galili, A T Clausen, Leif Katsuo Oxenlowe, L Grunernielsen, P JeppesenAbstract:A 1.28 Tbaud Data Signal is demonstrated, which is the highest symbol rate yet reported. The Data Signal is formed by optical time-division multiplexing of 128 Data channels at 10 Gbit/s OOK in a single polarisation. The generated 1.28 Tbit/s Data Signal is demultiplexed in a nonlinear optical loop mirror, resulting in error-free performance with a BER < 10 -9 for all 128 demultiplexed channels.
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640 gbit s clock recovery using periodically poled lithium niobate
Electronics Letters, 2008Co-Authors: Leif Katsuo Oxenlowe, Hans Christian Hansen Mulvad, Michael Galili, Gomez F Agis, Cedric Ware, Sunao Kurimura, K Kitamura, Hirochika Nakajima, Junichiro Ichikawa, D ErasmeAbstract:Pre-scaled clock recovery of a serial 640 Gbit/s Data Signal is demonstrated using a quasi-phase-matching periodically poled lithium niobate module as an ultrafast phase comparator in an optoelectronic phaselocked loop.
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clock recovery from 160 gbit s Data Signals using phase locked loop with interferometric optical switch based on semiconductor optical amplifier
Electronics Letters, 2001Co-Authors: T Yamamoto, Leif Katsuo Oxenlowe, R Ludwig, C Schubert, C Schmidt, E Hilliger, U Feiste, J Berger, H G WeberAbstract:Clock recovery from optical time division multiplexed Data Signals up to 160 Gbit/s is experimentally demonstrated using a phase-locked loop with a semiconductor optical amplifier in a loop mirror as a fast optical phase comparator. The timing jitter of the optical clock pulse extracted from a 160 Gbit/s Data Signal was <0.3 ps.
Hans Christian Hansen Mulvad - One of the best experts on this subject based on the ideXlab platform.
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ultra high speed optical serial to parallel Data conversion by time domain optical fourier transformation in a silicon nanowire
Optics Express, 2011Co-Authors: Hans Christian Hansen Mulvad, E Palushani, Hua Ji, Mads Lillieholm, Michael Galili, A T Clausen, Minhao Pu, Kresten Yvind, Hao Hu, J M HvamAbstract:We demonstrate conversion from 64 × 10 Gbit/s optical time-division multiplexed (OTDM) Data to dense wavelength division multiplexed (DWDM) Data with 25 GHz spacing. The conversion is achieved by time-domain optical Fourier transformation (OFT) based on four-wave mixing (FWM) in a 3.6 mm long silicon nanowire. A total of 40 out of 64 tributaries of a 64 × 10 Gbit/s OTDM-DPSK Data Signal are simultaneously converted with a bit-error rate (BER) performance below the 2 × 10−3 FEC limit. Using a 50 m long highly nonlinear fiber (HNLF) for higher FWM conversion efficiency, 43 tributaries of a 64 × 10 Gbit/s OTDM-OOK Data Signal are converted with error-free performance (BER<10−9).
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demonstration of 5 1 tbit s Data capacity on a single wavelength channel
Optics Express, 2010Co-Authors: Hans Christian Hansen Mulvad, Michael Galili, A T Clausen, Hao Hu, Leif Katsuo Oxenlowe, Jesper Bevensee Jensen, Christophe Peucheret, P JeppesenAbstract:We have generated a single-wavelength Data Signal with a Data capacity of 5.1 Tbit/s. The enabling techniques to generate the Data Signal are optical time-division multiplexing up to a symbol rate of 1.28 Tbaud, differential quadrature phase shift keying as Data format, and polarisation-multiplexing. For the first time, error-free performance with a bit error rate less than 10−9 is demonstrated for the 5.1 Tbit/s Data Signal. This is achieved in a back-to-back configuration using a direct detection receiver based on polarisation- and time-demultiplexing, delay-demodulation and balanced photo-detection.
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1 28 tbit s single polarisation serial ook optical Data generation and demultiplexing
Electronics Letters, 2009Co-Authors: Hans Christian Hansen Mulvad, Michael Galili, A T Clausen, Leif Katsuo Oxenlowe, L Grunernielsen, P JeppesenAbstract:A 1.28 Tbaud Data Signal is demonstrated, which is the highest symbol rate yet reported. The Data Signal is formed by optical time-division multiplexing of 128 Data channels at 10 Gbit/s OOK in a single polarisation. The generated 1.28 Tbit/s Data Signal is demultiplexed in a nonlinear optical loop mirror, resulting in error-free performance with a BER < 10 -9 for all 128 demultiplexed channels.
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40 ghz clock recovery from 640 gbit s otdm Signal using soa based phase comparator
Electronics Letters, 2008Co-Authors: Hans Christian Hansen Mulvad, H De Waardt, E Tangdiongga, H J S DorrenAbstract:A 40 GHz clock with low jitter is recovered from a 640 Gbit/s optical time-division multiplexed (OTDM), single-polarised, return-to-zero PRBS Data Signal. The clock recovery circuit is an injection-locked loop which contains a 40 GHz Gunn oscillator, a 40 GHz pulse source, and a semiconductor optical amplifier (SOA) assisted by a filtered chirp as optical phase comparator.
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640 gbit s clock recovery using periodically poled lithium niobate
Electronics Letters, 2008Co-Authors: Leif Katsuo Oxenlowe, Hans Christian Hansen Mulvad, Michael Galili, Gomez F Agis, Cedric Ware, Sunao Kurimura, K Kitamura, Hirochika Nakajima, Junichiro Ichikawa, D ErasmeAbstract:Pre-scaled clock recovery of a serial 640 Gbit/s Data Signal is demonstrated using a quasi-phase-matching periodically poled lithium niobate module as an ultrafast phase comparator in an optoelectronic phaselocked loop.
Michael Galili - One of the best experts on this subject based on the ideXlab platform.
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640 gbit s return to zero to non return to zero format conversion based on optical linear spectral phase filtering
Optics Letters, 2016Co-Authors: Reza Maram, Michael Galili, Leif Katsuo Oxenlowe, Deming Kong, Jose AzanaAbstract:We propose a novel approach for all-optical return-to-zero (RZ) to non-return-to-zero (NRZ) telecommunication Data format conversion based on linear spectral phase manipulation of an RZ Data Signal. The operation principle is numerically analyzed and experimentally validated through successful format conversion of a 640 Gbit/s coherent RZ Signal into the equivalent NRZ time-domain Data using a simple phase filter implemented by a commercial optical waveshaper.
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ultra high speed optical serial to parallel Data conversion by time domain optical fourier transformation in a silicon nanowire
Optics Express, 2011Co-Authors: Hans Christian Hansen Mulvad, E Palushani, Hua Ji, Mads Lillieholm, Michael Galili, A T Clausen, Minhao Pu, Kresten Yvind, Hao Hu, J M HvamAbstract:We demonstrate conversion from 64 × 10 Gbit/s optical time-division multiplexed (OTDM) Data to dense wavelength division multiplexed (DWDM) Data with 25 GHz spacing. The conversion is achieved by time-domain optical Fourier transformation (OFT) based on four-wave mixing (FWM) in a 3.6 mm long silicon nanowire. A total of 40 out of 64 tributaries of a 64 × 10 Gbit/s OTDM-DPSK Data Signal are simultaneously converted with a bit-error rate (BER) performance below the 2 × 10−3 FEC limit. Using a 50 m long highly nonlinear fiber (HNLF) for higher FWM conversion efficiency, 43 tributaries of a 64 × 10 Gbit/s OTDM-OOK Data Signal are converted with error-free performance (BER<10−9).
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demonstration of 5 1 tbit s Data capacity on a single wavelength channel
Optics Express, 2010Co-Authors: Hans Christian Hansen Mulvad, Michael Galili, A T Clausen, Hao Hu, Leif Katsuo Oxenlowe, Jesper Bevensee Jensen, Christophe Peucheret, P JeppesenAbstract:We have generated a single-wavelength Data Signal with a Data capacity of 5.1 Tbit/s. The enabling techniques to generate the Data Signal are optical time-division multiplexing up to a symbol rate of 1.28 Tbaud, differential quadrature phase shift keying as Data format, and polarisation-multiplexing. For the first time, error-free performance with a bit error rate less than 10−9 is demonstrated for the 5.1 Tbit/s Data Signal. This is achieved in a back-to-back configuration using a direct detection receiver based on polarisation- and time-demultiplexing, delay-demodulation and balanced photo-detection.
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1 28 tbit s single polarisation serial ook optical Data generation and demultiplexing
Electronics Letters, 2009Co-Authors: Hans Christian Hansen Mulvad, Michael Galili, A T Clausen, Leif Katsuo Oxenlowe, L Grunernielsen, P JeppesenAbstract:A 1.28 Tbaud Data Signal is demonstrated, which is the highest symbol rate yet reported. The Data Signal is formed by optical time-division multiplexing of 128 Data channels at 10 Gbit/s OOK in a single polarisation. The generated 1.28 Tbit/s Data Signal is demultiplexed in a nonlinear optical loop mirror, resulting in error-free performance with a BER < 10 -9 for all 128 demultiplexed channels.
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640 gbit s clock recovery using periodically poled lithium niobate
Electronics Letters, 2008Co-Authors: Leif Katsuo Oxenlowe, Hans Christian Hansen Mulvad, Michael Galili, Gomez F Agis, Cedric Ware, Sunao Kurimura, K Kitamura, Hirochika Nakajima, Junichiro Ichikawa, D ErasmeAbstract:Pre-scaled clock recovery of a serial 640 Gbit/s Data Signal is demonstrated using a quasi-phase-matching periodically poled lithium niobate module as an ultrafast phase comparator in an optoelectronic phaselocked loop.
