Transmission Systems

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Y Miyamoto - One of the best experts on this subject based on the ideXlab platform.

  • hybrid cladding pumped multicore edfa raman amplification for space division multiplexing Transmission Systems
    Optics Express, 2018
    Co-Authors: Takayuki Mizuno, Akira Isoda, Kohki Shibahara, Hirotaka Ono, Mitsunori Fukutoku, Y Miyamoto
    Abstract:

    We propose and demonstrate a hybrid cladding-pumped multicore erbium-doped fiber amplifier (EDFA) and distributed Raman amplification for space division multiplexing Transmission Systems. The cladding-pumped multicore EDFA is used to efficiently amplify signals in multiple cores simultaneously, while Raman pumping is used to control loss in each core individually. We construct an in-line amplified 7-core Transmission line, and show that distributed Raman amplification can compensate loss variation between cores. Furthermore, we transmit 46 WDM PDM-16QAM signals over a long distance of greater than 1000 km and demonstrate good Transmission performance.

  • dense space division multiplexed Transmission Systems using multi core and multi mode fiber
    Journal of Lightwave Technology, 2016
    Co-Authors: Takayuki Mizuno, Hidehiko Takara, Akihide Sano, Y Miyamoto
    Abstract:

    In this paper, we describe recent progress in space-division multiplexed (SDM) Transmission, and our proposal and demonstration of dense space-division multiplexing (DSDM), which offers the possibility of ultra-high capacity SDM Transmission Systems with high spatial density and spatial channel count of over 30 per fiber. We introduce the SDM Transmission matrix, which cross indexes the various types of multi-core multi-mode Transmissions according to the type of light propagation in optical fibers and how the spatial channels are handled in the network. For each category in the matrix, we present the latest advances in Transmission studies, and evaluate their Transmission performance by spectral and spatial efficiencies. We also expound on technologies for multi-core and/or multi-mode Transmission including optical fiber, signal processing, spatial multi/demultiplexer, and amplifier, which will play key roles in configuring DSDM Transmission Systems, and review the first DSDM Transmission experiment over a 12 core × 3 mode fiber.

  • multi core multi mode dense space division multiplexing for ultra high spectral efficiency Transmission Systems
    2014 Asia Communications and Photonics Conference (ACP), 2014
    Co-Authors: Takayuki Mizuno, Hidehiko Takara, Akihide Sano, Y Miyamoto
    Abstract:

    This paper describes our recent work on dense space division multiplexing (DSDM) over a multicore few-mode fiber. We show that using both multi-core and multi-mode is an effective approach towards ultra-high capacity Transmission Systems.

Changhee Lee - One of the best experts on this subject based on the ideXlab platform.

  • capacities of wdm Transmission Systems and networks limited by stimulated raman scattering
    IEEE Photonics Technology Letters, 2001
    Co-Authors: Hyun Deok Kim, Changhee Lee
    Abstract:

    We derive analytic expressions of the ultimate capacity-length-product (CLP) of the wavelength-division-multiplexing (WDM) Transmission Systems and the ultimate node throughput-length-product (NTLP) of the WDM networks limited by the stimulated Raman scattering (SRS). The CLP and the NTLP are proportional to the square root of the system capacity and the node throughput, respectively. However, they are independent of the system capacity and the node throughput when we compensate for the SRS induced power depletion. The CLP increases as we decrease the amplifier spacing. However, there exists an optimum amplifier spacing that maximizes the NTLP. The analytic results agree well with numerical simulation results.

T Yamamoto - One of the best experts on this subject based on the ideXlab platform.

  • waveform distortion due to stimulated raman scattering in wide band wdm Transmission Systems
    Journal of Lightwave Technology, 2001
    Co-Authors: S Norimatsu, T Yamamoto
    Abstract:

    The influence of stimulated Raman scattering (SRS) taking into account the random modulation and the walk-off effect on wide-band wavelength division multiplexing (WDM) Transmission Systems are studied theoretically. First, it is shown that power depletion due to SRS can be separated into average power loss and waveform distortion. The waveform distortion is evaluated for various types of pulse shapes and fibers, and simple equations for evaluating the waveform distortion due to SRS are derived. These equations can be easily applied for designing wide-band WDM Transmission Systems from the viewpoint of the SRS waveform distortion. We also compare results obtained from our method with those from the split-step Fourier method, and confirm validity of our method. Our method should be useful in the design of wide-band WDM Transmission Systems, in which SRS is expected to be a serious limitation.

H. Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • application of super dwdm technologies to terrestrial terabit Transmission Systems
    Journal of Lightwave Technology, 2006
    Co-Authors: H. Suzuki, Masamichi Fujiwara, Katsumi Iwatsuki
    Abstract:

    This paper describes application areas, elemental technologies, and the feasibility of terrestrial terabit wavelength division multiplexing (WDM) Transmission Systems based on super-dense wavelength division multiplexing (DWDM) technologies with a channel spacing of 12.5 GHz. Numerical simulation results quantitatively show that the merit of super-DWDM Transmission is the elimination of the need for dispersion compensation over the several hundreds of kilometers of standard single-mode fiber (SMF). To support super-DWDM Transmission, the prototype of a multiwavelength generator, which consists of just an intensity modulator and a phase modulator, is developed as a small-size WDM light source with high-wavelength stability. We use this prototype to conduct a 1.28-Tb/s (512 channels /spl times/ 2.5 Gb/s) Transmission experiment with a channel spacing of 12.5 GHz over 320 km (80 km /spl times/ 4 span) of standard SMF without dispersion compensation. The potential and the feasibility of super-DWDM Transmission with a channel spacing of 12.5 GHz for terrestrial Systems is confirmed by the numerical simulation and the Transmission experiment.

  • Application of Raman-distributed amplification to WDM Transmission Systems using 1.55-/spl mu/m dispersion-shifted fiber
    Journal of Lightwave Technology, 2001
    Co-Authors: N. Takachio, H. Suzuki
    Abstract:

    A numerical design method for wavelength division multiplexing (WDM) Transmission Systems employing distributed Raman amplification (DRA) is proposed. This method evaluates fiber nonlinear effects by considering the equivalent fiber loss with DRA. The method is used to evaluate the performance of WDM Transmission Systems in which DRA is employed in a 1.55-/spl mu/m dispersion-shifted fiber (DSF) Transmission line. Transmission limit and the optimum fiber input powers for 1550-nm band (C-band) and 1580-nm band (L-band) Transmission are investigated. Results show that bidirectional pumping is the best approach to extending Transmission distance. Furthermore, the transport limits of optical transport networks that use DRA and optical add/drop multiplexers are analyzed.

Ruediger Urbanke - One of the best experts on this subject based on the ideXlab platform.

  • High symbol rate coherent optical Transmission Systems: 80 and 107 Gbaud
    Journal of Lightwave Technology, 2014
    Co-Authors: Gregory Raybon, Andrew Adamiecki, Luis Salamanca, Filip Jorge, Chongin Xie, Steve Draving, Kenneth Rush, Jean-yves Dupuy, Sethumadhavan Chandrashekhar, Agnieszka Konczykowska, Peter J P.j. Winzer, Lawrence L. Buhl, Sebastian Randel, Marty Grove, Ruediger Urbanke
    Abstract:

    We demonstrate high speed optical Transmission Systems using digital coherent detection at all-electronically multiplexed symbol rates of 80 and 107 Gbaud. At 107 Gbaud, we demonstrate a single-carrier polarization division multiplexed quadrature phase shift keyed (PDM-QPSK) line rate of 428 Gb/s. At 80 Gbaud, we achieve a single-carrier line rate of 640 Gb/s using PDM 16-ary quadrature amplitude modulation (16-QAM). Using two optical subcarriers, we demonstrate a 1-Tb/s optical interface and conduct long-haul wavelength-division multiplexed (WDM) Transmission on a 200-GHz grid over 3200 km of ultra-large effective area fiber.