• Title, Summary, Keyword: wavelength division multiplexing (WDM)

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Structure and Performance Analysis of SCM-FTTH Network Based on WDM Technology of Next-Generation Optical Access Networks (차세대 광 액세스 네트워크의 WDM 기술을 기반으로 하는 SCM-FTTH 네트워크의 구조 및 성능 분석)

  • Lee, Sang-Wha
    • The Journal of the Korea Contents Association
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    • v.6 no.10
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    • pp.153-162
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    • 2006
  • The WDM/SCM-FTTH is an advanced optical access Network that can efficiently support various kinds of access network requirements using the WDM and SCM technologies in the near future. In this paper, we propose new network structures of the FTTH(Fiber To The Home) in the WDM(Wavelength Division Multiplexing) and WDM/SCM(Sub-Carrier Multiplexing) FTTH, and evaluate its performance with simulation results for the optical characteristics of the network and the dynamic allocation of bandwidth on demand of the users.

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On the Use of Adaptive Weight Functions in Wavelength-Continuous WDM Multi-Fiber Networks under Dynamic Traffic

  • Miliotis Konstantinos V.;Papadimitriou Georgios I.;Pomportsis Andreas S.
    • Journal of Communications and Networks
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    • v.7 no.4
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    • pp.499-508
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    • 2005
  • In this paper, we address the problem of efficient routing and wavelength assignment (RWA) in multi-fiber wavelength division multiplexing (WDM) networks without wavelength translation, under dynamic traffic. We couple Dijkstra's shortest path algorithm with a suitable weight function which chooses optical paths based both on wavelength availability and multi-fiber segments. We compare our approach with other RWA schemes both for regular and irregular WDM multi-fiber network topologies in terms of blocking probability and overall link utilization.

WDM/TDM-Based Channel Allocation Methodology in Optical Network-on-Chip (광학 네트워크-온-칩에서 WDM/TDM 기반 채널 할당 기법)

  • Hong, Yu Min;Lee, Jae Hoon;Han, Tae Hee
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.7
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    • pp.40-48
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    • 2015
  • An optical network-on-chip(ONoC) architecture is emerging as a new paradigm for solving on-chip communication bottleneck. Recent studies on ONoC have been focusing on supporting the parallel transmission and avoiding path collisions using wavelength division multiplexing(WDM). However, since the maximum number of wavelengths, which a single waveguide can accommodate is limited by crosstalk and insertion loss. Therefore previous WDM studies based on incrementing the number of different wavelengths according to the number of nodes would be infeasible due to the implementation complexity. To solve such problems, we combined time division multiplexing(TDM) and wavelength-routed ONoC, along with an optimized channel allocation algorithm, which can minimize the number of extra wavelength channels and latency caused by combining TDM scheme.

Comparison Study of Long-haul 100-Gb/s DDO-OFDM and CO-OFDM WDM Systems

  • Liu, Ling;Xiao, Shilin;Bi, Meihua;Zhang, Lu
    • Journal of the Optical Society of Korea
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    • v.20 no.5
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    • pp.557-562
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    • 2016
  • In this paper, for the first time, the transmission performances of long-haul 100-Gb/s direct detection optical OFDM (DDO-OFDM) and coherent optical OFDM (CO-OFDM) wavelength division multiplexing (WDM) systems are compared by simulation. It provides specific guides for system parameter selection to get a high-performance and cost-effective OFDM WDM system. Specifically, the comparison involves three aspects: launched power is investigated to achieve better system performance; laser linewidth is numerically investigated to choose cost-effective laser; system dispersion tolerances with different laser linewidths are analyzed to further reveal the advantages and disadvantages of these two detecting methods, direct detection and coherent detection, in long-haul OFDM WDM system.

Review on the Optical tin]k Technologies for the Gigabit-per-second Wavelength-Division-Multiplexing Passive Optical Networks (WDM-PONs) (기가급 WDM-PON을 위한 광기술 분석)

  • Park Tae-Sang;Park Kun-Youl;Kim Jin-Hee;Yoon Ho-Sung
    • 한국정보통신설비학회:학술대회논문집
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    • pp.11-14
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    • 2006
  • This paper reviews the optical link technologies which have been developed for gigabit-per-second wavelength-division-multiplexing passive optical networks (WDM-PONs). Similarly to the 100Mb/s WDM-PON systems which have been deployed for trial services by KT, the most important requirement for 1Gb/s WDM-PON is wavelength independence (colorless feature) of its ONU/ONTs, which makes possible convenient operation and cost-effective maintenance with minimum inventory cost. Among various methods to implement such colorless feature, four promising candidates for gigabit WDM-PON are analyzed with their own development issues and their expected performances are compared.

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Enhanced p-Cycles for WDM Optical Network with Limited Wavelength Converters (제한된 광 파장변환 기능을 가지는 WDM망을 고려한 개선된 p-Cycle 기법)

  • Shin, Sang-Heon;Shin, Hae-Joon;Kim, Young-Tak
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.3B
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    • pp.200-208
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    • 2003
  • In this paper, we propose an enhanced p-cycles (preconfigured protection cycles) scheme for fast restoration in WDM (Wavelength Division Multiplexing) optical mesh network with limited wavelength conversion for fast restoration. We enhanced the p-cycles to accommodate uni-directional connections to be used in uni-directional multicasting or asymmetric broadband multimedia communications with bi-directional connectivity. We applied it to WDM network with limited wavelength conversion and analyzed the result. The analysis results show that the enhanced p-cycle algorithm provides better performance in WDM optical networks with limited wavelength converter.

New MAC Protocol for TWDM PON (TWDM PON을 위한 새로운 MAC 프로토콜)

  • Han, Man Soo;Na, Cheol Hun;Kang, Sung Jun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.741-742
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    • 2013
  • Passive optical networks (PONs) are the emerging solution for access networks since PONs provide high bandwidth. TDM ((time-division multiplexing) PON cannot support sufficient bandwidth for new broadband services such as UHD (ultra high-definition) IP TV, and VOD (video on demand). The solution is TWDM PON which is a mixture of WDM (wavelength-division multiplexing) and TDM. This paper proposes a new MAC (media access control) protocol for TWDM PON.

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Demonstration of RSOA-Based 20 Gb/s Linear Bus WDM-PON with Simple Optical Add-Drop Node Structure

  • Lee, Han-Hyub;Cho, Seung-Hyun;Lee, Eun-Gu;Lee, Sang-Soo
    • ETRI Journal
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    • v.32 no.2
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    • pp.248-254
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    • 2010
  • We demonstrate a linear bus wavelength-reused gigabit wavelength-division multiplexing passive optical network (WDM-PON) with multiple optical add-drop nodes. A commercially available reflective semiconductor optical amplifier-based WDM-PON has a sufficient power budget to provide multiple optical add/drop nodes in 16 WDM channels. Sixteen 1.25 Gb/s WDM channels are successfully transmitted over 20 km of single-mode fiber with four optical add/drop multiplexers, even with 32 dB reflection and chromatic dispersion in the link.

Analysis of RF Signal Transmission in WDM-ROF Employging Photonic Crystal Fiber (광결정 광섬유를 갖는 WDM-ROF 시스템의 고주파 신호전송특성 분석)

  • Kim, So-An;Park, Chul-Soo;Lee, Chung-Ghiu
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.1
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    • pp.188-194
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    • 2011
  • We analyze transmission performance of radio frequency signal in WDM-ROF (wavelength division multiplexing - radio over fiber) system employing photonic crystal fiber. In a WDM-ROF system employing conventional single-mode fiber, transmission performance of radio frequency signal is analyzed depending on each WDM channel. In this case, each WDM channel experiences power fluctuation of received RF signal in remote node because of double sidebands of the modulated signal and wavelength dependent dispersion of single mode fiber. This RF power fluctuation acts as a design constraint in viewpoint of system design. By employing photonic crystal fiber (PCF) with dispersion compensation characteristics, the transmission performance of RF signal can be improved compared with the case with SMF only.

A Novel Method to Design an Optimum Dispersion Map for a Wavelength Division Multiplexing Ring Network

  • Lee, Jong-Hyung
    • Current Optics and Photonics
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    • v.3 no.3
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    • pp.193-198
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    • 2019
  • We propose a novel method to design a dispersion map for a WDM (Wavelength Division Multiplexing) ring network with the capability of wavelength reconfiguration. The method is simple, but gives us an optimum set of DCMs (Dispersion Compensation Modules) which satisfies a given value of the tolerable residual dispersion. The proposed method does not depend on compensation method, fiber type, or modulation format. We also demonstrate numerically how it works with an example 10-node ring network.