The Experts below are selected from a list of 8292 Experts worldwide ranked by ideXlab platform

Idelfonso Tafur Monroy - One of the best experts on this subject based on the ideXlab platform.

  • all vcsel based digital coherent detection link for multi gbit s wdm Passive Optical Networks
    Optics Express, 2010
    Co-Authors: Roberto Rodes, Christian Neumeyr, Jesper Bevensee Jensen, Darko Zibar, Enno Roenneberg, Juergen Rosskopf, M Ortsiefer, Idelfonso Tafur Monroy
    Abstract:

    We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of −36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully Passive fiber transmission with no use of Optical amplification or Optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent Passive Optical Networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent Optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.

  • all vcsel based digital coherent detection link for multi gbit s wdm Passive Optical Networks
    Optics Express, 2010
    Co-Authors: Roberto Rodes, Christian Neumeyr, Jesper Bevensee Jensen, Darko Zibar, Enno Roenneberg, Juergen Rosskopf, M Ortsiefer, Idelfonso Tafur Monroy
    Abstract:

    We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of -36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully Passive fiber transmission with no use of Optical amplification or Optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent Passive Optical Networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent Optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.

Chiwai Chow - One of the best experts on this subject based on the ideXlab platform.

  • using ook modulation for symmetric 40 gb s long reach time sharing Passive Optical Networks
    IEEE Photonics Technology Letters, 2010
    Co-Authors: Chienhung Yeh, Chiwai Chow, Chia Hsuan Wang, F Y Shih, Sien Chi
    Abstract:

    Due to the requirement of broad bandwidth for next-generation access Networks, present Passive Optical Networks (PONs) will be upgraded to 40 Gb/s or higher data rate PONs. Hence, we propose and experimentally demonstrate a simple and efficient scheme to achieve a symmetric 40-Gb/s long-reach (LR) time-division-multiplexed PON by using four wavelength-division-multiplexed 10-Gb/s external on-off keying format channels to serve as the Optical transmitter for downstream and upstream traffic simultaneously. Moreover, the system performance of LR transmission and split ratio have also been analyzed and discussed without dispersion compensation.

  • wdm extended reach Passive Optical Networks using ofdm qam
    Optics Express, 2008
    Co-Authors: Chiwai Chow, Chienhung Yeh, Chia Hsuan Wang, Fu Yuan Shih, Ciling Pan, Sien Chi
    Abstract:

    In order to reduce the cost for delivering future broadband services, network operators are inclined to simplify the network architectures by integrating the metro and access Networks into a single system. Hence, extended reach Passive Optical Networks (ER-PONs) have been proposed. ER-PON usually has four new features: high data rate in both upstream and downstream signals (>1 Gb/s); reach extension to >100 km; a high split ratio (>100); and using wavelength division multiplexing (WDM). In this work, we propose and demonstrate a highly spectral efficient ER-PON using 4 Gb/s OFDM-QAM for both upstream and downstream signals, while achieving a high split-ratio of 256. The ER-PON employs Optical components optimized for GPON (bandwidth of ∼1GHz) and reaches 100 km without dispersion compensation. Numerical analysis using 16, 64 and 256-QAM OFDM are also performed to study the back-to-back receiver sensitivities and power penalties at different electrical driving ratios.

  • wavelength remodulation using dpsk down and upstream with high extinction ratio for 10 gb s dwdm Passive Optical Networks
    IEEE Photonics Technology Letters, 2008
    Co-Authors: Chiwai Chow
    Abstract:

    We propose and demonstrate a novel wavelength remodulation scheme using differential phase-shift keying (DPSK) modulation format in both downstream and upstream signals for ldquocolorlessrdquo dense wavelength-division-multiplexed (DWDM) Passive Optical Networks (PONs). The scheme enables high extinction ratio in both downstream and upstream remodulated signals. Error-free operation was achieved in a 20-km-reach 10-Gb/s DWDM-PON without dispersion compensation. Timing misalignment tolerance between downstream and upstream remodulated signals and maximum launched Optical power for the proposed scheme are studied. Comparison with other wavelength remodulation schemes for DWDM-PONs is also performed, showing the proposed scheme can be a potential candidate for next-generation wavelength reuse DWDM-PONs.

  • Long Reach Passive Optical Networks
    LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007
    Co-Authors: Paul D. Townsend, E K Machale, Cleitus Antony, Giuseppe Talli, Peter Ossieur, Chiwai Chow, R P Davey, T. De Ridder, H.g. Krimmel
    Abstract:

    We discuss recent progress in the development of Optically amplified, long reach Passive Optical Networks, which aim to significantly reduce network complexity and cost by integrating metro and access into a single, all-Optical communication system.

Roberto Rodes - One of the best experts on this subject based on the ideXlab platform.

  • all vcsel based digital coherent detection link for multi gbit s wdm Passive Optical Networks
    Optics Express, 2010
    Co-Authors: Roberto Rodes, Christian Neumeyr, Jesper Bevensee Jensen, Darko Zibar, Enno Roenneberg, Juergen Rosskopf, M Ortsiefer, Idelfonso Tafur Monroy
    Abstract:

    We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of −36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully Passive fiber transmission with no use of Optical amplification or Optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent Passive Optical Networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent Optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.

  • all vcsel based digital coherent detection link for multi gbit s wdm Passive Optical Networks
    Optics Express, 2010
    Co-Authors: Roberto Rodes, Christian Neumeyr, Jesper Bevensee Jensen, Darko Zibar, Enno Roenneberg, Juergen Rosskopf, M Ortsiefer, Idelfonso Tafur Monroy
    Abstract:

    We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of -36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully Passive fiber transmission with no use of Optical amplification or Optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent Passive Optical Networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent Optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.

Sien Chi - One of the best experts on this subject based on the ideXlab platform.

  • using ook modulation for symmetric 40 gb s long reach time sharing Passive Optical Networks
    IEEE Photonics Technology Letters, 2010
    Co-Authors: Chienhung Yeh, Chiwai Chow, Chia Hsuan Wang, F Y Shih, Sien Chi
    Abstract:

    Due to the requirement of broad bandwidth for next-generation access Networks, present Passive Optical Networks (PONs) will be upgraded to 40 Gb/s or higher data rate PONs. Hence, we propose and experimentally demonstrate a simple and efficient scheme to achieve a symmetric 40-Gb/s long-reach (LR) time-division-multiplexed PON by using four wavelength-division-multiplexed 10-Gb/s external on-off keying format channels to serve as the Optical transmitter for downstream and upstream traffic simultaneously. Moreover, the system performance of LR transmission and split ratio have also been analyzed and discussed without dispersion compensation.

  • wdm extended reach Passive Optical Networks using ofdm qam
    Optics Express, 2008
    Co-Authors: Chiwai Chow, Chienhung Yeh, Chia Hsuan Wang, Fu Yuan Shih, Ciling Pan, Sien Chi
    Abstract:

    In order to reduce the cost for delivering future broadband services, network operators are inclined to simplify the network architectures by integrating the metro and access Networks into a single system. Hence, extended reach Passive Optical Networks (ER-PONs) have been proposed. ER-PON usually has four new features: high data rate in both upstream and downstream signals (>1 Gb/s); reach extension to >100 km; a high split ratio (>100); and using wavelength division multiplexing (WDM). In this work, we propose and demonstrate a highly spectral efficient ER-PON using 4 Gb/s OFDM-QAM for both upstream and downstream signals, while achieving a high split-ratio of 256. The ER-PON employs Optical components optimized for GPON (bandwidth of ∼1GHz) and reaches 100 km without dispersion compensation. Numerical analysis using 16, 64 and 256-QAM OFDM are also performed to study the back-to-back receiver sensitivities and power penalties at different electrical driving ratios.

  • fiber fault monitoring technique for Passive Optical Networks based on fiber bragg gratings and semiconductor Optical amplifier
    Optics Communications, 2006
    Co-Authors: Chienhung Yeh, Sien Chi
    Abstract:

    A novel monitoring method for in-service fault indemnification in Passive Optical Networks (PONs) is proposed and demonstrated experimentally. The proposed monitoring technique is based on fiber Bragg grating (FBG) sensors and fiber laser scheme, and a semiconductor Optical amplifier (SOA) is used to serve as a gain medium. By detecting the number of the wavelength lasing, the fiber-fault can be monitored without affecting the in-service channels. Moreover, the strain behavior on the FBGs has also been discussed.

  • Optical fiber fault surveillance for Passive Optical Networks in s band operation window
    Optics Express, 2005
    Co-Authors: Chienhung Yeh, Sien Chi
    Abstract:

    An S-band (1470 to 1520 nm) fiber laser scheme, which uses multiple fiber Bragg grating (FBG) elements as feedback elements on each Passive branch, is proposed and described for in-service fault identification in Passive Optical Networks (PONs). By tuning a wavelength selective filter located within the laser cavity over a gain bandwidth, the fiber-fault of each branch can be monitored without affecting the in-service channels. In our experiment, an S-band four-branch monitoring tree-structured PON system is demonstrated and investigated experimentally.

Christian Neumeyr - One of the best experts on this subject based on the ideXlab platform.

  • Flexible transmitters based on directly modulated VCSELs for next-generation 50G Passive Optical Networks
    Journal of Optical Communications and Networking, 2020
    Co-Authors: Paola Parolari, Alberto Gatto, Christian Neumeyr, Pierpaolo Boffi
    Abstract:

    Discrete multitone (DMT) modulation, due to its water-filling nature, is proposed to enable flexibility in Passive Optical Networks (PONs), optimizing the PON resource usage. The use of DMT signals to directly modulate long-wavelength vertical-cavity surface-emitting lasers (VCSELs) can provide energy-efficient transmitters for 50G PONs. First, we present preliminary experimental measures employing both single-sideband and dual-sideband DMT modulation with already available short-cavity VCSELs operating in the third window to study the PON performance as a function of the accumulated chromatic dispersion and of the received power. The experimental results are then compared with simulations, demonstrating the effectiveness of the developed simulation tool. Then we study the performance of DMT-modulated transmitters based on next-generation short-cavity VCSELs with higher bandwidth (up to 20 GHz) operating in the O-band, evaluating their chromatic dispersion resilience. Finally, considering the statistics of a commercially deployed PON, we demonstrate that DMT modulation, providing link adaptation, offers a significant increase in the total aggregated capacity compared to a single-carrier-based fixed-rate PON, optimizing the PON resource usage with respect to the available power budget and the dispersion impairments.

  • all vcsel based digital coherent detection link for multi gbit s wdm Passive Optical Networks
    Optics Express, 2010
    Co-Authors: Roberto Rodes, Christian Neumeyr, Jesper Bevensee Jensen, Darko Zibar, Enno Roenneberg, Juergen Rosskopf, M Ortsiefer, Idelfonso Tafur Monroy
    Abstract:

    We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of −36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully Passive fiber transmission with no use of Optical amplification or Optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent Passive Optical Networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent Optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.

  • all vcsel based digital coherent detection link for multi gbit s wdm Passive Optical Networks
    Optics Express, 2010
    Co-Authors: Roberto Rodes, Christian Neumeyr, Jesper Bevensee Jensen, Darko Zibar, Enno Roenneberg, Juergen Rosskopf, M Ortsiefer, Idelfonso Tafur Monroy
    Abstract:

    We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of -36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully Passive fiber transmission with no use of Optical amplification or Optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent Passive Optical Networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent Optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.