wavelength division multiplexing

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Chao-chin Yang - One of the best experts on this subject based on the ideXlab platform.

  • wavelength division multiplexing spectral amplitude coding applications in fiber vibration sensor systems
    IEEE Sensors Journal, 2011
    Co-Authors: Hsu Chih Cheng, Chung-hao Wu, Chao-chin Yang, Yao Tang Chang
    Abstract:

    This paper presents a wavelength division multiplexing/spectral amplitude coding system with optical code-division multiple-access, for applications using fiber vibration sensors. The device makes use of fiber Bragg grating (FBG) etching on optical fibers to provide encoding/decoding functionality. According to the orthogonal properties of spectral amplitude coding (SAC) using m-sequence code, the encoding- decoding devices that employ FBG filters provide a considerable reduction in multiple access interference in optical code division multiple access systems. The proposed fiber vibration sensor located between the encoder and optical circulator enables the measurement of multiple points. Experimental results reveal that the proposed sensor detects a variety of vibrational signals.

  • hybrid wavelength division multiplexing spectral amplitude coding optical cdma system
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Chao-chin Yang
    Abstract:

    One spectral-amplitude-coding (SAC) scheme combined with wavelength-division-multiplexing (WDM) is proposed for optical code-division multiple-access systems. The supported code length is more flexible than the previous SAC codes and the corresponding encoder-decoder requires less fiber gratings, thus, the system becomes cheap and simple. As compared to the conventional SAC systems, this WDM/SAC system not only reserves the interference-cancellation property, but also has better performance against the effect of the phase-induced intensity noise arising in the photodetecting process. Thus, a larger number of active users can be supported under a given bit-error rate.

Neal S Bergano - One of the best experts on this subject based on the ideXlab platform.

  • wavelength division multiplexing in long-haul transoceanic transmission systems
    Journal of Lightwave Technology, 2005
    Co-Authors: Neal S Bergano
    Abstract:

    wavelength division multiplexing (WDM) technology used in long-haul transmission systems has steadily progressed over the past few years. Newly installed state-of-the-art transoceanic systems now have terabit per second maximum capacity, while being flexible enough to have an initial deployed capacity at a fraction of the maximum. The steady capacity growth of these long-haul fiber-optic cable systems has resulted from many improvements in WDM transmission techniques and an increased understanding of WDM optical propagation. Important strides have been made in areas of dispersion management, gain equalization, modulation formats, and error-correcting codes that have made possible the demonstration of capacities approaching 4 Tb/s over transoceanic distances in laboratory experiments.

  • wavelength division multiplexing in Long-Haul Transmission Systems
    Frontiers in Optics, 2004
    Co-Authors: Neal S Bergano
    Abstract:

    wavelength division multiplexing technology used in long-haul transmission systems has steadily progressed over the past few years. New installed state-of-the-art transoceanic systems now have terabit/s maximum capacity. Laboratory experiments have demonstrated multiple terabit/s operation over transoceanic distances.

  • wavelength division multiplexing in Long-Haul Transmission Systems
    1996
    Co-Authors: Neal S Bergano
    Abstract:

    The Erbium-Doped Tiber Amplifier (EDFA) has had a profound impact on the design, operation and performance of transoceanic cable transmission, and is central to the expected proliferation of cable systems. Laboratory experiments have demonstrated 100 Gb/s over transoceanic distances using wavelength division multiplexing (WDM) techniques. These large transmission capacity experiments have resulted from an increased understanding of the effects that can limit performance of WDM systems. Important strides have been made in areas of dispersion management, gain equalization, and modulation formats which have made possible the demonstration of large data transmission capacity. This paper reviews experimental techniques developed to improve the performance of long-haul WDM transmission systems based on the Non-Return-to-Zero (NRZ) format, and other non-soliton methods.

  • wavelength division multiplexing in long-haul transmission systems
    Journal of Lightwave Technology, 1996
    Co-Authors: Neal S Bergano, C.r. Davidson
    Abstract:

    wavelength division multiplexing shows great promise for the next generation of long-haul undersea cable transmission systems. WDM techniques will allow for greater transmission capacity and network flexibility compared to the present single-channel optical amplifier systems. The transmission of many WDM channels over transoceanic distances can be limited by a variety of phenomena, including the finite bandwidth of the erbium-doped fiber amplifier repeaters, the nonlinear interactions between channels, and the noise accumulation along the chain of amplifiers. Significant progress has been made over the past few years in understanding the nature of these impairments for long-distance transmission. This paper describes techniques used to transmit many WDM channels over transoceanic distances using the nonreturn-to-zero format and other nonsoliton methods. Data is presented for several WDM experiments including the transmission of 100 Gb/s (20 channels of 5 Gb/s) over 9100 km

Zhen Wang - One of the best experts on this subject based on the ideXlab platform.

  • field demonstration of high speed wavelength division multiplexing quantum key distribution system and its stabilized operation
    Opto-Electronics and Communications Conference, 2012
    Co-Authors: Kenichiro Yoshino, Mikio Fujiwara, Akihiro Tanaka, Seigo Takahashi, Yoshihiro Nambu, Akihisa Tomita, Shigehito Miki, Taro Yamashita, Zhen Wang, Masahide Sasaki
    Abstract:

    A high-speed quantum key distribution system with the wavelength-division multiplexing was demonstrated in 12hour continuous operation. We achieved a secure key rate of 208 kbps through a 45-km field fiber with 14.5-dB loss.

  • high speed wavelength division multiplexing quantum key distribution system
    Optics Letters, 2012
    Co-Authors: Kenichiro Yoshino, Mikio Fujiwara, Akihiro Tanaka, Seigo Takahashi, Yoshihiro Nambu, Akihisa Tomita, Shigehito Miki, Taro Yamashita, Zhen Wang, Masahide Sasaki
    Abstract:

    A high-speed quantum key distribution system was developed with the wavelength-division multiplexing (WDM) technique and dedicated key distillation hardware engines. Two interferometers for encoding and decoding are shared over eight wavelengths to reduce the system’s size, cost, and control complexity. The key distillation engines can process a huge amount of data from the WDM channels by using a 1 Mbit block in real time. We demonstrated a three-channel WDM system that simultaneously uses avalanche photodiodes and superconducting single-photon detectors. We achieved 12 h continuous key generation with a secure key rate of 208 kilobits per second through a 45 km field fiber with 14.5 dB loss.

  • ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength division multiplexing clock synchronization
    Optics Express, 2008
    Co-Authors: Akihiro Tanaka, Kenichiro Yoshino, Mikio Fujiwara, Seigo Takahashi, Yoshihiro Nambu, Shigehito Miki, Sae Woo Nam, Wakako Maeda, Burm Baek, Zhen Wang
    Abstract:

    We demonstrated ultra fast BB84 quantum key distribution (QKD) transmission at 625 MHz clock rate through a 97 km field-installed fiber using practical clock synchronization based on wavelength-division multiplexing (WDM). We succeeded in over-one-hour stable key generation at a high sifted key rate of 2.4 kbps and a low quantum bit error rate (QBER) of 2.9%. The asymptotic secure key rate was estimated to be 0.78–0.82 kbps from the transmission data with the decoy method of average photon numbers 0, 0.15, and 0.4 photons/pulse.

Kenichiro Yoshino - One of the best experts on this subject based on the ideXlab platform.

  • field demonstration of high speed wavelength division multiplexing quantum key distribution system and its stabilized operation
    Opto-Electronics and Communications Conference, 2012
    Co-Authors: Kenichiro Yoshino, Mikio Fujiwara, Akihiro Tanaka, Seigo Takahashi, Yoshihiro Nambu, Akihisa Tomita, Shigehito Miki, Taro Yamashita, Zhen Wang, Masahide Sasaki
    Abstract:

    A high-speed quantum key distribution system with the wavelength-division multiplexing was demonstrated in 12hour continuous operation. We achieved a secure key rate of 208 kbps through a 45-km field fiber with 14.5-dB loss.

  • high speed wavelength division multiplexing quantum key distribution system
    Optics Letters, 2012
    Co-Authors: Kenichiro Yoshino, Mikio Fujiwara, Akihiro Tanaka, Seigo Takahashi, Yoshihiro Nambu, Akihisa Tomita, Shigehito Miki, Taro Yamashita, Zhen Wang, Masahide Sasaki
    Abstract:

    A high-speed quantum key distribution system was developed with the wavelength-division multiplexing (WDM) technique and dedicated key distillation hardware engines. Two interferometers for encoding and decoding are shared over eight wavelengths to reduce the system’s size, cost, and control complexity. The key distillation engines can process a huge amount of data from the WDM channels by using a 1 Mbit block in real time. We demonstrated a three-channel WDM system that simultaneously uses avalanche photodiodes and superconducting single-photon detectors. We achieved 12 h continuous key generation with a secure key rate of 208 kilobits per second through a 45 km field fiber with 14.5 dB loss.

  • ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength division multiplexing clock synchronization
    Optics Express, 2008
    Co-Authors: Akihiro Tanaka, Kenichiro Yoshino, Mikio Fujiwara, Seigo Takahashi, Yoshihiro Nambu, Shigehito Miki, Sae Woo Nam, Wakako Maeda, Burm Baek, Zhen Wang
    Abstract:

    We demonstrated ultra fast BB84 quantum key distribution (QKD) transmission at 625 MHz clock rate through a 97 km field-installed fiber using practical clock synchronization based on wavelength-division multiplexing (WDM). We succeeded in over-one-hour stable key generation at a high sifted key rate of 2.4 kbps and a low quantum bit error rate (QBER) of 2.9%. The asymptotic secure key rate was estimated to be 0.78–0.82 kbps from the transmission data with the decoy method of average photon numbers 0, 0.15, and 0.4 photons/pulse.

Masahide Sasaki - One of the best experts on this subject based on the ideXlab platform.

  • field demonstration of high speed wavelength division multiplexing quantum key distribution system and its stabilized operation
    Opto-Electronics and Communications Conference, 2012
    Co-Authors: Kenichiro Yoshino, Mikio Fujiwara, Akihiro Tanaka, Seigo Takahashi, Yoshihiro Nambu, Akihisa Tomita, Shigehito Miki, Taro Yamashita, Zhen Wang, Masahide Sasaki
    Abstract:

    A high-speed quantum key distribution system with the wavelength-division multiplexing was demonstrated in 12hour continuous operation. We achieved a secure key rate of 208 kbps through a 45-km field fiber with 14.5-dB loss.

  • high speed wavelength division multiplexing quantum key distribution system
    Optics Letters, 2012
    Co-Authors: Kenichiro Yoshino, Mikio Fujiwara, Akihiro Tanaka, Seigo Takahashi, Yoshihiro Nambu, Akihisa Tomita, Shigehito Miki, Taro Yamashita, Zhen Wang, Masahide Sasaki
    Abstract:

    A high-speed quantum key distribution system was developed with the wavelength-division multiplexing (WDM) technique and dedicated key distillation hardware engines. Two interferometers for encoding and decoding are shared over eight wavelengths to reduce the system’s size, cost, and control complexity. The key distillation engines can process a huge amount of data from the WDM channels by using a 1 Mbit block in real time. We demonstrated a three-channel WDM system that simultaneously uses avalanche photodiodes and superconducting single-photon detectors. We achieved 12 h continuous key generation with a secure key rate of 208 kilobits per second through a 45 km field fiber with 14.5 dB loss.

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