The Experts below are selected from a list of 633 Experts worldwide ranked by ideXlab platform

Lin Sun - One of the best experts on this subject based on the ideXlab platform.

  • multiband three dimensional carrierless amplitude phase Modulation for short reach optical communications
    Journal of Lightwave Technology, 2016
    Co-Authors: Lin Sun
    Abstract:

    Multi-dimensional carrierless amplitude phase (CAP) Modulation attracts a lot interest in recent optical communications as an Advanced Modulation Format with improved performance. In this paper, we have demonstrated a multiband three-dimensional CAP (3D-CAP) Modulation scheme and investigated its applications in short reach optical communication systems. Corresponding digital filters are designed by minimax algorithm with additional linear constraint to avoid the coding intersymbol interference. The performance of the digital filters is analyzed for optical fiber links with data rate over 100 Gb/s based on simulations. Similar to discrete multitone technique, several independent bands can be loaded with different 3D-CAP signals in the proposed multiband 3D-CAP system, offering improved tolerance to non-flat channels. 2-km single mode fiber transmission at total bit rate of 112.5 Gb/s is investigated through simulations and the results indicate better performance of multiband 3D-CAP compared with conventional 3D-CAP in short reach optical communication.

Chienhung Yeh - One of the best experts on this subject based on the ideXlab platform.

  • cost effective direct detection all optical ook ofdm system with analysis of modulator bandwidth and driving power
    IEEE Photonics Journal, 2015
    Co-Authors: Chin Wei Hsu, Chiwai Chow, Chienhung Yeh
    Abstract:

    Optical orthogonal frequency-division multiplexing (OFDM) with Advanced Modulation Format [e.g., quadrature amplitude Modulation (QAM) and quadrature phase-shift keying (QPSK)] provides many transmission advantages. As the OFDM data rate is limited by the electronic digital-to-analog (DAC) and analog-to-digital (ADC) integrated circuits, an all-optical technique (i.e., all-optical OFDM) is used to construct an OFDM symbol; hence, it can provide a significant improvement in transmission capacity. In this work, we propose and demonstrate a cost-effective 275-Gb/s direct-detection all-optical OFDM system for access or data center networks. As all wavelength channels (11 wavelengths in the experiment) are produced by one laser source, only the temperature control of one master laser is enough. In addition, each wavelength channel in the all-optical OFDM signal is encoded using on–off keying (OOK) Modulation Format; the traditional generation and detection circuits used in the transmitter (Tx) and receiver (Rx) of the present passive optical network can still be used. We also numerically analyze the requirements of the opt-comb-MOD (modulator used to generate the optical comb source) and the data-MOD (modulator used to generate the OOK data) in the system.

Kenichi Kitayama - One of the best experts on this subject based on the ideXlab platform.

  • coherent radio over fiber and millimeter wave radio seamless transmission system for resilient access networks
    IEEE Photonics Journal, 2012
    Co-Authors: Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Yoshihiro Yasumura, Kenichi Kitayama
    Abstract:

    We propose a millimeter-wave (MMW) coherent radio-over-fiber (RoF) transmission system for application to an access network with a direct broadband last-mile wireless connection to an optical fiber network. The coherent RoF system comprises an optical two-tone RoF signal generator with an Advanced Modulation Format for high-throughput transmission and employs a digital-signal-processing-aided coherent detection technique for MMW radio, which is a technique similar to that of optical digital coherent detection. As proof of concept, a 20-GBd quadrature phase-shift keying RoF transmission over 20 km of optical fiber before a radio transmission over 20 m of air is demonstrated. The results of the radio transmissions using Cassegrain-type antenna pairs with a gain of 50 dBi are consistent with theoretical estimations; this suggests the possibility of developing a midrange transmission system using a high-power MMW amplifier.

Chin Wei Hsu - One of the best experts on this subject based on the ideXlab platform.

  • cost effective direct detection all optical ook ofdm system with analysis of modulator bandwidth and driving power
    IEEE Photonics Journal, 2015
    Co-Authors: Chin Wei Hsu, Chiwai Chow, Chienhung Yeh
    Abstract:

    Optical orthogonal frequency-division multiplexing (OFDM) with Advanced Modulation Format [e.g., quadrature amplitude Modulation (QAM) and quadrature phase-shift keying (QPSK)] provides many transmission advantages. As the OFDM data rate is limited by the electronic digital-to-analog (DAC) and analog-to-digital (ADC) integrated circuits, an all-optical technique (i.e., all-optical OFDM) is used to construct an OFDM symbol; hence, it can provide a significant improvement in transmission capacity. In this work, we propose and demonstrate a cost-effective 275-Gb/s direct-detection all-optical OFDM system for access or data center networks. As all wavelength channels (11 wavelengths in the experiment) are produced by one laser source, only the temperature control of one master laser is enough. In addition, each wavelength channel in the all-optical OFDM signal is encoded using on–off keying (OOK) Modulation Format; the traditional generation and detection circuits used in the transmitter (Tx) and receiver (Rx) of the present passive optical network can still be used. We also numerically analyze the requirements of the opt-comb-MOD (modulator used to generate the optical comb source) and the data-MOD (modulator used to generate the OOK data) in the system.

Atsushi Kanno - One of the best experts on this subject based on the ideXlab platform.

  • coherent radio over fiber and millimeter wave radio seamless transmission system for resilient access networks
    IEEE Photonics Journal, 2012
    Co-Authors: Atsushi Kanno, Toshiaki Kuri, Iwao Hosako, Tetsuya Kawanishi, Yuki Yoshida, Yoshihiro Yasumura, Kenichi Kitayama
    Abstract:

    We propose a millimeter-wave (MMW) coherent radio-over-fiber (RoF) transmission system for application to an access network with a direct broadband last-mile wireless connection to an optical fiber network. The coherent RoF system comprises an optical two-tone RoF signal generator with an Advanced Modulation Format for high-throughput transmission and employs a digital-signal-processing-aided coherent detection technique for MMW radio, which is a technique similar to that of optical digital coherent detection. As proof of concept, a 20-GBd quadrature phase-shift keying RoF transmission over 20 km of optical fiber before a radio transmission over 20 m of air is demonstrated. The results of the radio transmissions using Cassegrain-type antenna pairs with a gain of 50 dBi are consistent with theoretical estimations; this suggests the possibility of developing a midrange transmission system using a high-power MMW amplifier.