• Title, Summary, Keyword: dispersion

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Compensation Characteristics of WDM Signals Depending on Dispersion Coefficient of Dispersion Compensating Fiber and Residual Dispersion Per Span (분산 보상 광섬유의 분산 계수와 중계 구간 당 잉여 분산에 따른 WDM 신호의 보상 특성)

  • Lee, Seong-Real
    • Journal of Advanced Navigation Technology
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    • v.17 no.1
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    • pp.16-23
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    • 2013
  • The effects of dispersion coefficient of dispersion compensating fiber (DCF) and residual dispersion per span (RDPS) on in the dispersion managed optical links for compensating the distorted 960 Gbps wavelength division multiplexd (WDM) signals due to group velocity dispersion (GVD) and optical nonlinear effects of single mode fiber (SMF) are investigated. It is confirmed that optimal net residual dispersion (NRD), which greatly affects compensating for optical signals, should be induced under the large launch power condition, irrelevant on the considered dispersion coefficient of DCF and RDPS. It is also confirmed that system performances are greatly improved by selecting the very small RDPS and very large dispersion coefficient of DCF.

Optimal Net Residual Dispersion for Compensation of WDM Signals in Dispersion Managed Optical Links with Random Distribution of SMF Length and RDPS (중계 구간의 SMF 길이와 RDPS의 분포가 랜덤한 분산 제어 광전송 링크에서의 WDM 신호의 보상을 위한 최적 전체 잉여 분산)

  • Lee, Seong-Real
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.638-641
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    • 2012
  • Optimal net residual dispersion (NRD) and effective launching power range of optical transmission links with random distribution of single mode fiber (SMF) length and residual dispersion per span (RDPS) required to flexibly design of optical links in dispersion management (DM) technique for compensating the distorted 960 Gbps optical signals due to interaction of group velocoty dispersion (GVD) and optical nonlinear effects are induced.

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Decaying/Expanding Distribution of RDPS in the Half Section of a Dispersion-Managed Optical Link Combined with Mid-Span Spectral Inversion

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.17 no.4
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    • pp.227-233
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    • 2019
  • In long-haul optical communication system consisting of standard single-mode fiber spans and fiber amplifiers, such as the erbium-doped fiber amplifier, performance is deteriorated by signal distortion due to chromatic dispersion and nonlinearity of the fiber. A combination of dispersion management and optical phase conjugation is an effective technique to compensate for the distortion. In an optical link configured by this combination, a dispersion map mainly affects the compensation of the distorted optical signals. This paper proposes new dispersion maps configured by the decaying or expanding distribution of residual dispersion per span (RDPS) in a dispersion-managed link combined with a midway optical phase conjugator. The effect of the proposed dispersion maps on the compensation for distorted 24 channel × 40 Gbps wavelength-division multiplexed signals was assessed through numerical simulation. It was confirmed that all the proposed dispersion maps are most appropriate for the compensation and, furthermore, for the flexibility of link configuration than conventional links.

Dispersion-Managed Links Formed of SMFs and DCFs with Irregular Dispersion Coefficients and Span Lengths

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.16 no.2
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    • pp.67-71
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    • 2018
  • The various techniques to compensate for the signal distortion due to the group velocity dispersion (GVD) and nonlinear Kerr effects of optical fibers in the optical links have been proposed in the literature. We propose a flexible dispersion-managed link configuration consisted of single-mode and dispersion-compensating fibers with irregular dispersion coefficients over all fiber spans, and an optical phase conjugator added midway along the optical links. By distributing the lengths of the single mode fibers, we achieve a flexible optical link. The simultaneous ascending and descending distribution of the single-mode fiber lengths before and after the optical phase conjugator, respectively, best compensates the distorted wavelength division multiplexed signals in the optical link with non-fixed coefficients. Our result is consistent with those of our previous work on fixed coefficients. Therefore, to improve the compensation at any magnitude of dispersion coefficient, we must artificially distribute the lengths of the single-mode fibers into a dispersion-managed link.

Optical Transmission Link with Dispersion Management near-by Midway Optical Phase Conjugator (Midway 광 위상 공액기 근처에서 분산 제어를 수행하는 광전송 링크)

  • Lee, Seong-Real
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.633-635
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    • 2018
  • 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 ${\times}$ 80 km) 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).

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Chromatic Dispersion Tolerance of the SSB-Modulated Signals

  • Park Sang-Gyu
    • Journal of the Optical Society of Korea
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    • v.9 no.1
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    • pp.13-15
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    • 2005
  • It is shown that the SSB modulated signal has smaller chromatic-dispersion induced penalty than the DSB modulated signal only when the accumulated dispersion is large. When the accumulated dispersion is small, the SSB modulated signal has larger dispersion penalty than the DSB modulated signal. Therefore, if one builds a system with very low dispersion penalty, SSB modulation may end up with a larger dispersion penalty.

Discrete Dispersion Distributed Fiber Optimcla Cable for DWDM System (이산형 분산 분포를 갖는 DWDM 시스템용 광섬유 케이블)

  • Park, Euy-Don;Lee, Dong-Uk;Park, Hae-Young;Kim, Dae-Won;Jung, Yun-C;Son, Hyun;Cho, Yung-Ki
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.10
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    • pp.522-531
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    • 2001
  • A large dispersion value in optical fiber cable should be maintained to suppress the nonlinear effect induced distortion for the narrow channel spaced DWDM system while small value of dispersion is needed for high bit rate transmission. To meet these two requirement simultaneously, dispersion distribution control method during the cabling process was exploited. And dispersion distribution cable was fabricated by the way of designing alternation sections in single cable piece with standard single mode fiber(SSMF) and newly developed negative dispersion fiber(NDF). It is shown that the discretely dispersion varying cable along the axis keep the same average dispersion value of an entire cable length as that of nonzero dispersion shifted fiber(NZDSF) with 3.6 ps/km/nm while the local dispersion is around 17 ps/km/nm of absolute value. Moreover, the developed cable had good optical and mechanical properties and the feasibility of this cable for practical use was confirmed.

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WDM Transmission using Inline Dispersion Management of Bi-end Schemes in Optical Transmission Links (광전송 링크에서 bi-end 구조의 inline 분산 제어를 이용한 WDM 전송)

  • Lee, Seong-Real
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.784-786
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    • 2010
  • Implementation possibility of inline dispersion management (DM) using bi-end schemes, which consist of one single mode fiber (SMF) and two dispersion compensating fiber (DCF) placed at front and rear of SMF, respectively, is investigated for compensating total dispersion accumulated in a span of WDM transmission links. It is confirmed that if net residual dispersion (NRD) is decided to be ${\pm}10\;ps/nm$ then bi-end scheme is effective to compensate for WDM channels with wide launching power range.

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Dispersion Managed Optical Transmission Links with an Artificial Distribution of the SMF Length and Residual Dispersion per Span

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.12 no.2
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    • pp.75-82
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    • 2014
  • Dispersion management (DM), optical phase conjugation (OPC), and the combination of DM and OPC are promising techniques to compensate for optical signal distortion due to group velocity dispersion and nonlinear Kerr effects. The system performance improvement in DM links combined with OPC has been reported; however, the fixed residual dispersion per span (RDPS) usually used in these links restricts the flexibility of link configuration. Thus, in this paper, a flexible optical link configuration with artificially distributed single-mode fiber (SMF) lengths and RDPS in the combination of DM and OPC is proposed. Simulation results show that the best artificial distribution pattern is the gradually descending distribution of SMF lengths and the gradually ascending distribution of RDPS, as the number of fiber spans is increased, regardless of the average RDPS, the optimal net residual dispersion, and the dispersion coefficient of the dispersion compensating fiber.

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.