• Title, Summary, Keyword: Optical Phase Conjugator(OPC)

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Compensation for the Distorted WDM Channels through the Dispersion-managed Optical Links with Non-midway Optical Phase Conjugator (Non-midway 광 위상 공액기를 갖는 분산 제어 전송 링크를 통한 WDM 채널의 왜곡 보상)

  • Lee, Seong-Real
    • Journal of Advanced Navigation Technology
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    • v.19 no.6
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    • pp.595-600
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    • 2015
  • The implementation possibility of the flexible optical network configuration using the non-midway optical phase conjugator (OPC) in the dispersion-managed (DM) optical link for wavelength division multiplexed (WDM) transmission is demonstrated in this paper. It is confirmed that the implementation possibility of flexible link configuration is more increased, as number of fiber spans is more bigger and the residual dispersion per span (RDPS) is more large. It is also confirmed that the non-midway OPC link, in which RDPS of the latter half transmission section (after OPC) is decided by the averaged RDPS of the former half transmission section (before OPC), has more advantage for the flexible network configuration.

Compensation Characteristics Dependence on the Position of Optical Phase Conjugator in 320 Gbps WDM System

  • Lee Seong-Real;Yim Hwang-Bin
    • Journal of electromagnetic engineering and science
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    • v.4 no.4
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    • pp.162-167
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    • 2004
  • In this paper, optimal position of optical phase conjugator(OPC) for best compensating distorted WDM channels due to both chromatic dispersion and self phase modulation(SPM) is numerically investigated, and the compensation characteristics of overall WDM channels at this position is investigated, comparing with that in case of OPC placed at mid-way of total transmission length. It is confirmed that the compensation extents in WDM system with OPC is more improved by the shifting OPC position from the mid-way of total transmission length. And, we confirmed that the optimal position of OPC must be selected to the position decreasing not only eye opening penalty(EOP) of overall WDM channels but also EOP deviation between WDM channels, and this OPC position should be altered as various system parameters such as modulation format, and fiber dispersion, etc. Using proposed configuration, it is possible to remove all in-line dispersion compensator, reducing span losses and system costs.

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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    • 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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Compensation for Distorted Signals by using Optimal Pump Light Power in WDM Systems with Non-midway Optical Phase Conjugator

  • Lee Seong-Real
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.7A
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    • pp.542-549
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    • 2005
  • In this paper, the optimal pump light power of optical phase conjugator (OPC) and the compensation characteristics of distorted WDM channel signals are numerically investigated, when the OPC with highly-nonlinear dispersion shifted fiber (HNL-DSF) not be placed at the mid-way of total transmission length. The total dispersion of former half section and latter half section is assumed to be same each other in this approach. It is confirmed that, in WDM transmission systems with OPC deviated from the mid-way, the pump light power for best compensation must be flexible selected depending on the OPC position. This optimal pump light power is gradually increased as the OPC is gradually closer to the receiver. Consequently, it is possible to establish the compensation system independent on the OPC position by setting optimal pump light power connected with the OPC position.

Dispersion-managed Transmission Links with the Non-midway Optical Phase Conjugator (Non-midway 광 위상 공액기를 갖는 분산 제어 링크)

  • Lee, Seong-Real
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.671-673
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    • 2017
  • The maximum number of fiber spans is induced in disoersion-managed optical links with the non-midway optical phase conjugator (OPC) for the compensation of the distorted WDM signals due to the group velocity dispersion (GVD) are evaluated and compared.

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Dispersion-managed Transmission Links with the Non-midway Optical Phase Conjugator (Non-midway 광 위상 공액기를 갖는 분산 제어 링크)

  • Lee, Seong-Real
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.744-746
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    • 2017
  • The maximum number of fiber spans is induced in disoersion-managed optical links with the non-midway optical phase conjugator (OPC) for the compensation of the distorted WDM signals due to the group velocity dispersion (GVD) are evaluated and compared.

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Compensation of the Distorted 640 Gbps WDM Signals using Optical Phase Conjugator

  • Lee, Seong-Real;Lee, Young-Gyo
    • Journal of information and communication convergence engineering
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    • v.5 no.3
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    • pp.273-280
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    • 2007
  • The numerical methods for finding the optimal parameters in 640 Gbps (16 channels $\times$ 40 Gbps) WDM system with optical phase conjugator (OPC) are proposed, which effectively compensate the distorted overall WDM channels. The considered optimal parameters are the OPC position and the dispersion coefficient of fibers. The numerical approaches are accomplished through two different procedures. One of these procedures is that the optimal OPC position is previously searched and then the optimal dispersion coefficient is searched at the obtained optimal OPC position. The other is the reverse of the above procedure. From the numerical results, it is confirmed that two optimal parameters depend on each other, but less related with the searching procedure. The methods proposed in this research will be expected to alternate with the method of making a symmetrical distribution of power and local dispersion in real optical link which is a serious problem of applying the OPC into multi-channels WDM system.

Dispersion Managed Optical Transmission Links with Optimized Optical Phase Conjugator

  • Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.7 no.3
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    • pp.372-376
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    • 2009
  • In this paper, new and simple optical transmission link with fixed dispersion management (DM) scheme, i.e., pre(post) compensation and residual dispersion per span (RDPS) are fixed to net residual dispersion (NRD) = 0 ps/nm, and optical phase conjugator (OPC) having optimal position depending on launch power in WDM transmission system is proposed. Also, effective launch power range of WDM channels resulting 1 dB eye opening penalty (EOP) is induced as a function of OPC position. First, it is confirmed that, for applying DM into WDM transmission link fixed pre(post)compensation and RDPS, which are independence on exact system parameters except launch power, sufficiently are used in WDM links, but OPC with optimal position is needed for effective compensating impairments of WDM channels. And, it is confirmed that effective launch power is broader in case of RDPS = 100 ps/nm than in RDPS = 50 ps/nm. But, it is shown that the best OPC position offset is -0.6 km from a point of view of power window, which is defined as difference between maximum and minimum effective launch power.

The Flexible Design of 0.96 Tbps WDM System over 1,000km NZ-DSF by Using Optimal Parameters of Optical Phase Conjugator (광 위상 공액기의 최적 파라미터를 이용한 1,000km NZ-DSF를 갖는 0.96 Tbps WDM 시스템의 유연한 설계)

  • Lee, Seong-Real;Doh, Kyu-Bong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.7A
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    • pp.657-665
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    • 2007
  • In this paper, it is investigated that the limitation due to the asymmetry of optical power and chromatic dispersion with respect to optical phase conjugator (OPC) for compensating optical signal distortion of WDM channels in mid-span spectral inversion (MSSI) technique is overcame by using OPC position offset and optimal dispersion coefficients of fiber sections, which depend on OPC position offset. It is confirmed that overall WDM channels are efficiently compensated by applying the optimal parameter values obtained from the proposed method into 24 channels ${\times}\;40\;Gbps$ WDM system with non zero - dispersion shifted fiber (NZ-DSF) of 1,000 km, such as power penalties of inter-channel are reduce to almost 3.5 dB from the infinite value. It is also confirmed that the flexible design of WDM system with OPC is possible by using the optimal parameters, in which OPC is placed at ${\pm}15\;km$ from 500 km for efficiently compensating overall channels.

BER Improvements of 0.96 Tbps WDM Signals through Optimal Parameter Values of Optical Phase Conjugator (광 위상 공액기의 최적 파라미터 값 도출을 통한 0.96 Tbps WDM 신호의 BER 개선)

  • Lee, Youngkyo
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.11 no.1
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    • pp.79-88
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    • 2015
  • In this paper, it is investigated that the limitation due to the asymmetry of optical power and chromatic dispersion with respect to optical phase conjugator (OPC) for compensating optical signal distortion in WDM system is overcomed by using OPC position offset and optimal dispersion coefficients of fiber sections, which depend on OPC position offset. It is confirmed that overall WDM channels are efficiently compensated by applying the optimal parameter values obtained from the proposed method into 24 channels ${\times}40$ Gbps WDM system with non zero - dispersion shifted fiber (NZ-DSF) of 1, 000 km, such as power penalties of inter-channel are reduce to almost 3.5 dB from the infinite value. It is also confirmed that the flexible design of WDM system with OPC is possible by using the optimal parameters, in which OPC is placed at ${\pm}15km$ from 500 km for efficiently compensating overall channels. Thus, the methods proposed in this research will be expected to alternate with the method of making a symmetrical distribution of power and local dispersion in real optical link which generates a serious problem if it was not made but it is the condition in the case of applying the OPC into multi-channels WDM system.