• Title/Summary/Keyword: wavelength dispersion

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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.

A Study on the Chromatic Dispersion in the concatenated Single-Mode Optical Fibers (연쇄 접속된 단일 모드 광섬유의 분산특성에 관한 연구)

  • 장대석;이상설
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.13 no.6
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    • pp.462-469
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    • 1988
  • Choromatic dispersion of single mode optical fibers limits the maximum bit rate in the single mode optical transmission systems. In this paper we calculate chromatic dispersion and dispersion parametes(zero dispersion wavelength, dispersion slope) for concatenated single mode optical fibers form the chromatic dispersion and dispersion parameters of individual single mode optical fibers, and compare theoretical valuse with those measrued by double demodulation method. Calculated values are coincident with measured ones reasonably. The standard deviation is 0.77-1.28nm for zero dispersion wavelength and 0.56-0.75PS/km.nm2 for dispersion slope. The standard deviation of zero dispersion wavelength is inverse proportional to the optical fiber lenght.

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Control of Wavelength Dispersion of Birefringence by Miscible Polymer Blends

  • Ougizawa, Toshiaki;Kuboyamaima, Keiichi
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.365-365
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    • 2006
  • The wavelength dispersion of birefringence (or retardation) is very important property for optical use of polymer films. Birefringence free film and retardation film have been widely used for applications such as liquid crystal display (LCD). In this study, miscible polymer blends which consist of polymers of positive and negative birefringence were found. By operating composition and orientation of molecules in the transparent blend films, the behavior of wavelength dispersion of birefringence (retardation) was controlled. The applicability to wideband birefringence free film and quarter wave (retardation) film was discussed.

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Compensation Characteristics Depending on Extinction Ratio of RZ Pulse in Dispersion-managed Link Combined with MSSI (MSSI와 결합된 분산 제어 링크에서 RZ 펄스의 소광비에 따른 보상 특성)

  • Seong-Real Lee
    • Journal of Advanced Navigation Technology
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    • v.28 no.1
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    • pp.123-128
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    • 2024
  • When mid-span spectral inversion (MSSI), which inverts the propagated wave into phase-conjugated wave in the middle of the entire transmission distance, is combined with dispersion-managed link, it is very effective in compensating for the wavelength division multiplexed (WDM) signal distortion due to chromatic dispersion and nonlinear effects. In this MSSI combined dispersion-managed link, the shape of the dispersion map, channel data rate, channel wavelength and wavelength spacing, etc. affect the compensation and, consequently, determine the transmission distance and capacity of the WDM signal. In this paper, the compensation according to the extinction ratio of the return-to-zero (RZ) pulse that constitutes the WDM signal in the MSSI combined distributed control link was numerically analyzed. As a result of the simulation, it was conformed that the extinction ratio to obtain the best compensation should be determined depending on the shape of the dispersion map and the size of the residual dispersion per span, which determines the specific shape of the dispersion map. These results show a significant difference from the results in a general optical transmission system, where as the extinction ratio increases, the power difference between the '1' and '0' signals increases, thereby improving reception performance.

Measurement of Zero Dispersion Wavelength in an Optical Fiber Using the Oscillatory Behavior of Four-Wave Mixing Efficiency

  • Kim, Dong-Hwan;Kim, Sang-Hyuck;Jo, Jae-Cheol;Choi, Sang-Sam
    • Journal of the Optical Society of Korea
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    • v.5 no.1
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    • pp.20-24
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    • 2001
  • Non-destructive measurement of zero-dispersion wavelength variation in a dispersion shifted fiber by four-wave mixing technique is carried out. The oscillatory behavior of the four-wave mixing efficiency is utilized for the measurement of the linear dispersion slope and zero-dispersion wavelength. A simple formula useful for engineering estimation of the characteristics of fiber four-wave mixing efficiency is presented.

Measurement of linear dispersion of optical fibers in zero-dispersion wavelength region (분산천이 광섬유의 영분산 파장영역에서 선형분산 곡선측정)

  • 김동환;김상혁;조재철;최상삼
    • Korean Journal of Optics and Photonics
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    • v.9 no.1
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    • pp.20-24
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    • 1998
  • Fiber four-wave mixing(FWM) in zero-dispersion wavelength region is studied. FWM efficiency of -26 dBm and bandwidth of 2nm are measured. The linear dispersion slope in zero-dispersion wavelength region is calculated from the modulation behavior of FWM efficiency.

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Measurement of temperature dependence of the zero dispersion wavelength using Four-Wave mixing in DSF (4광파혼합을 이용한 온도에 따른 분산천이광섬유(DSF)의 영분산파장 변화 측정)

  • 김상혁;김동환;조재철;김선호;김상국;최상삼
    • Korean Journal of Optics and Photonics
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    • v.9 no.2
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    • pp.123-126
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    • 1998
  • We derived an equation showing the temperature dependence of the zero-dispersion wavelength and measured the temperature dependence of the zero dispersion wavelength using four-wave mixing in dispersion shifted fibers in the range of $22^{\circ}C-59^{\circ}C$ From the experimental results, we found that the zero-dispersion wavelength is increased as the temperature around DSF increases and its temperature dependence is 0.032 nm/$^{\circ}C$. Also, the calculated behavior of FWM efficiency coincided with the experimental result.

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Chromatic Dispersion Compensation via Mid-span Spectral Inversion with Periodically Poled $LiNbO_3$ Wavelength Converter at Low Pump Power

  • Kim, Min-Su;Ahn, Joon-Tae;Kim, Jong-Bae;Ju, Jung-Jin;Lee, Myung-Hyun
    • ETRI Journal
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    • v.27 no.3
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    • pp.312-318
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    • 2005
  • Mid-span spectral inversion (MSSI) has to utilize high optical pump power, for its operation principle is based on a nonlinear optical wavelength conversion. In this paper, a low pump-power operation of MSSI-based chromatic dispersion compensation (CDC) has been achieved successfully, for the first time to our knowledge, by introducing a noise pre-reduction scheme in cascaded wavelength conversions with periodically poled $LiNbO_3$ waveguides at a relatively low operation temperature. As preliminary studies, phase-matching properties and operation-temperature dependence of the wavelength converter (WC) were characterized. The WC pumped at 1549 nm exhibited a wide conversion bandwidth of 59 nm covering the entire C-band and a conversion efficiency of -23.6 dB at 11 dBm pump power. CDC experiments were implemented with 2.5 and 10 Gb/s transmission systems over 100 km single-mode fiber. Although it is well-known that the signal distortion due to chromatic dispersion is not critical at a 2.5 Gb/s transmission, the clear recovery of eye patterns was identified. At 10 Gb/s transmission experiments, eye patterns were retrieved distinctly from seriously distorted ones, and notable improvements in bit-error rates were acquired at a low pump power of 14 dBm.

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Optical Transmission Link with Balanced and Unbalanced Dispersion Distributions and Non-midway Optical Phase Conjugator

  • Chung, Jae-Pil;Lee, Seong-Real
    • Journal of information and communication convergence engineering
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    • v.19 no.4
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    • pp.199-204
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    • 2021
  • We propose a dispersion-managed link with a non-midway optical phase conjugator (OPC), in which the residual dispersion per span (RDPS) of each fiber span is different for each transmission section before and after OPC. We numerically demonstrate the compensation for 960-Gb/s wavelength-division multiplexed (WDM) signals distorted by chromatic dispersion and Kerr nonlinearity of the fiber. We consider different cases for non-midway OPC, including six fiber spans - OPC - 14 fiber spans and 14 fiber spans - OPC - 6 fiber spans. The numerical results show that the compensation of the distorted 960 Gb/s WDM is more efficient when the OPC is placed after 6-th fiber span as compared to after the 14-th fiber span. Our simulation results also indicate that the compensation effect increases when the difference in net residual dispersion between both transmission sections is not large, but they are not the same. Under this condition, the larger the magnitude of the RDPSs of each fiber span, the greater the compensation.

Transmission Performance of 960 Gbps WDM Signals Depends on Dispersion Compensation Configurations (분산 보상 구조에 따른 960 Gbps WDM 신호의 전송 성능)

  • Lee, Seong-Real
    • Journal of Advanced Navigation Technology
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    • v.15 no.2
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    • pp.248-255
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    • 2011
  • An investigation has been carried out, by computer simulation, to evaluate the impact of dispersion compensation configurations on 960 Gbps wavelength division multiplexed (WDM) system with optical phase conjugator (OPC). The considered dispersion compensation configurations in this research are conventional one-end type and bi-end type. One-end and bi-end type are made by using one dispersion compensating fiber (DCF) and two DCFs to decrease dispersion accumulated in one single mode fiber (SMF) span, respectively. It is found that bi-end compensation configuration offers the equal performance with that of one-end configuration in WDM system with residual dispersion per span (RDPS) of 400 ps/nm if net residual dispersion (NRD) had to be optimized in each cases.