• Title/Summary/Keyword: Optical Fiber Link

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Optimal Design Condition of Optical Links with Residual Dispersion Per Span (RDPS) Presented in Only One Single Mode Fiber Span in Each Transmission Session Respect with Optical Phase Conjugator (광 위상 공액기를 중심으로 각 전송 구획에서 하나의 단일 모드 광섬유 중계 구간에만 RDPS를 갖는 광전송 링크의 최적 설계 조건)

  • Lee, Seong-Real
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.05a
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    • pp.594-597
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    • 2012
  • Optimal link configuration in optical link with concentrated residual dispersion per span (RDPS) in only one fiber span and 0 ps/nm of RDPS in other fiber spans of each half transmission section with respect to optical phase conjugator (OPC) placed at middle of total transmission length is induced in this paper.

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Pseudo-symmetrically Dispersion-Managed Optical Transmission Links with Midway OPC for Compensating for Distorted WDM Signals

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.13 no.4
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    • pp.228-234
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    • 2015
  • The system performance improvement in dispersion managed (DM) links combined with optical phase conjugator (OPC) for compensating for optical signal distortion due to group velocity dispersion and nonlinear fiber effects has been reported. However, in DM link combined OPC, the equalities of the lengths of single-mode fibers (SMFs), the length of dispersion compensating fibers (DCFs), the dispersion coefficient of DCF, and the residual dispersion per span (RDPS) with respect to an OPC restrict a flexible link configuration. Thus, in this paper, we propose a flexible optical link configuration with inequalities of link parameters, the so-called "pseudo-symmetric configuration." Simulation results show that, in the restricted RDPS range of 450 ps/nm to 800 ps/nm, the improvement in the system performance of the proposed pseudo-symmetrically configured optical links is better than that of the asymmetrically configured optical links. Consequently, we confirmed that the proposed pseudo-symmetric configuration is effective and useful for implementing a reconfigurable long-haul wavelength-division multiplexing (WDM) network.

A Novel Shared Segment Protection Algorithm for Multicast Sessions in Mesh WDM Networks

  • Lu, Cai;Luo, Hongbin;Wang, Sheng;Li, Lemin
    • ETRI Journal
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    • v.28 no.3
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    • pp.329-336
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    • 2006
  • This paper investigates the problem of protecting multicast sessions in mesh wavelength-division multiplexing (WDM) networks against single link failures, for example, a fiber cut in optical networks. First, we study the two characteristics of multicast sessions in mesh WDM networks with sparse light splitter configuration. Traditionally, a multicast tree does not contain any circles, and the first characteristic is that a multicast tree has better performance if it contains some circles. Note that a multicast tree has several branches. If a path is added between the leave nodes on different branches, the segment between them on the multicast tree is protected. Based the two characteristics, the survivable multicast sessions routing problem is formulated into an Integer Linear Programming (ILP). Then, a heuristic algorithm, named the adaptive shared segment protection (ASSP) algorithm, is proposed for multicast sessions. The ASSP algorithm need not previously identify the segments for a multicast tree. The segments are determined during the algorithm process. Comparisons are made between the ASSP and two other reported schemes, link disjoint trees (LDT) and shared disjoint paths (SDP), in terms of blocking probability and resource cost on CERNET and USNET topologies. Simulations show that the ASSP algorithm has better performance than other existing schemes.

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Dispersion-managed Link with Unequally Residual Dispersion per Span with Respect to Non-midway Optical Phase Conjugator (Non-midway 광 위상 공액기를 중심으로 중계 구간 당 잉여 분산이 일치하지 않는 분산 제어 링크)

  • Seong-Real Lee
    • Journal of Advanced Navigation Technology
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    • v.25 no.6
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    • pp.517-522
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    • 2021
  • Optical dispersion-managed link combined with optical phase conjugation for compensating of the distorted optical signals due to chromatic dispersion and nonlinear effects, which is required to implement long-haul wavelength division multiplexed system, is proposed and assessed in viewpoint of network topology flexibility. Optical phase conjugator capable to compensate for the distorted optical signal due to nonlinear effects is placed non-midway of total transmission distance. And, in dispersion-managed link, residual dispersion per span (RDPS) of each fiber spans in former half section and latter half section with respect to optical phase conjugator are different to each other. Simulation results show when the RDPS of each fiber sections in one half section makes it's own net residual dispersion slight different from another half section's net residual dispersion, the compensation effect in the proposed link configuration is more increased.

Implemeention and performance measurement of a novel in-service supervisory system for WDM transmission link (파장분할다중화방식 전송로의 In-service 감시를 위한 새로운 감시시스템의 구현 및 성능평가)

  • 김필한;윤호성;박남규;서재은;정기태;유기원;이규행
    • Korean Journal of Optics and Photonics
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    • v.12 no.2
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    • pp.129-134
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    • 2001
  • Novel supervisory system for WDM transmission link using conventional optical time domain reflectometry was presented. By modifying the structure of erbuim doped fiber amplifier to support bi-directional transmission at arDR pulse wavelength and launching the optical pulse into transmission link in the opposite direction of data signal propagation to avoid the distortion by cross-gain modulation, it is possible to monitor the WDM link in service. To prove the validity of proposed scheme, the supervision result of 2.5 Gbps $\times$ 8 channel WDM 320 km transmission system in service by arDR was presented. And power penalty due to monitoring was measured as smaller than 0.3 dB. .3 dB.

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320km Optical Transmission using EDFA and Raman amplifier for 10Gbit/s 128 Channel DWDM Signals (10 Gbit/s 128 채널 고밀도 파장다중화 신호를 위해 EDFA와 라만 증폭기를 이용한 320km 광전송 실험)

  • Choi, Bo-Hun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.6B
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    • pp.568-574
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    • 2009
  • 320km optical transmission link for 128 channel DWDM (dense wavelength-division-multiplexing) signals is simulated and fabricated. An optical fiber amplifier for the link is composed of a distributed Raman amplifier and dual C/L-band EDFAs which are optimized for the performances of an optical amplifier obtained from the simulation. Gain and NF of the optimized EDFAs are above 19dB and below 7.5dB, respectively. The resultant OSNRs (optical signal to noise ratios) of the link are average 25dB on each band.

Compensation of the Distorted WDM Channels Depending on the Control Position of Net Residual Dispersion in Dispersion-managed Optical Link with the Randomly Distributed SMF Lengths and RDPS (SMF 길이와 RDPS가 랜덤하게 분포하는 분산 제어 광전송 링크에서 전체 잉여 분산 조절 위치에 따른 왜곡된 WDM 채널의 보상)

  • Lee, Seong-Real
    • Journal of Advanced Navigation Technology
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    • v.21 no.2
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    • pp.187-192
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    • 2017
  • The compensation characteristics of the distorted WDM channels compensated for by dispersion management (DM) and optical phase conjugation in the long-haul (50 fiber spans ${\times}80km$) transmission link with the randomly distributed single mode fiber (SMF) length and residual dispersion per spans (RDPS) are investigated as a function of the arrangement of SMF and dispersion compensating fiber (DCF) and the control position of net residual dispersion (NRD). It is confirmed that the compensation effect of the distorted WDM channels strongly depends on the arragement of SMF and DCF, rather than the control position of NRD.

Required Specification Analysis of Radio over Fiber system for LTE-Advanced Fronthaul link (LTE-Advanced 이동통신망 Fronthaul 구간을 위한 Radio over Fiber 시스템의 필요 전송용량 및 요구사항 분석)

  • Kim, Sung-Man
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.8
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    • pp.915-919
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    • 2014
  • Since smart phones are widely used globally, the demand for high-speed mobile communications are increasing. To accommodate the increased communication demand, the next-generation mobile communication services such as LTE-Advanced are deployed. In the LTE-Advanced base stations, the base station schemes of Digital Unit (DU) and Radio Unit (RU) are widely used. Here, the link between DU and RU is called fronthaul link. In the current fronthaul link, a digital optical communication interface is used, which is called Common Public Radio Interface (CPRI). However, the CPRI link cannot support the increased mobile traffic efficiently. Therefore, in this paper, we investigate an alternative technology based on the Radio over Fiber (RoF) to accommodate the increased mobile traffic economically.

Optimum Design of High Speed Transmission SMF Link Using DCF (분산보상 광섬유를 이용한 초고속 단일모드 광섬유 전송링크의 최적 설계 연구)

  • 김용범
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.9B
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    • pp.1518-1526
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    • 2000
  • This paper proposes an optical transmission link design method based on an optimum compensation scheme using dispersion compensating fiber (DCF), so that high-speed long-distance optical transmission would be possible over the conventional standard single mode fiber (SMF) link. The proposed design method provides the maximized transmission distances according to the signal speeds, where the amplifier spacing and repeater spacing are optimized wit respect to self-phase modulation(SPM) due to fiber nonlinearity and amplified spontaneous emission (ASE) noises caused by optical amplifies. It is also shown that there exists an optimum input signal power range balancing the effects of ASE noise and SPM for the given amplifier spacing and repeater spacing.

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Field Trial of the Korean-Made 45Mb/s Optical Fiber Communication System (45Mb/s 국산 광직유 통신 시스템의 현장 시험)

  • 강민호;이용택;이상호;이만섭;유강희;박희갑;이성은;추흥로
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.32 no.2
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    • pp.50-58
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    • 1983
  • In this paper, a field trial of the Korean-made optical fiber communication system is described. This system was installed between Gu-Ro and Ann-Yang telephone offices on November 1981, and carries a 44.7Mb/s NRZ signal(672 voice channel equivalent). For this trial, optical fiber cable, optical terminal equipment, optical repeater, fusion splicer and measurement equipment have been developed. Employing graded index optical fiber at a wave length of $0.85\;\mu\textrm{m}$, average optical attenuation and splicing losses of 3.6 dB/km and 0.4 dB, resectively, were realized. With link margins of 8~20dB and bit error rate of less than $10^{-10}$, this system has been carrying live traffic between Seoul and Ann Yang telephone offices.