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Proceedings ArticleDOI

Compensation of dispersion in 5 Gbps WDM system by using DCF

06 Mar 2014-pp 1-5
TL;DR: The design of a Wavelength Division Multiplexed system (WDM) with dispersion compensation fiber (DCF) is discussed and the bit error rate (BER) of the system under two different modulation schemes is discussed to identify the better modulation format and best compensation technique in WDM network.
Abstract: In Optical communication network pulse broadening due to chromatic dispersion becoming an important factor for signal degradation. This may become worse when the data transmission rate keep increasing. So in order to achieve high data transmission rate at long span-length light wave system, the chromatic dispersion in the fiber must be compensated. Many compensation techniques have been demonstrated and they exhibit a variety of different and often complimentary properties. Transmitter compensation techniques are the most easily implemented but provide a limited amount of compensation. The most commercially advanced technique is negative dispersion fiber. We discuss the design of a Wavelength Division Multiplexed system (WDM) with dispersion compensation fiber (DCF). The effect of both pre-compensation and post-compensation techniques has also been discussed. The bit error rate (BER) of the system under two different modulation schemes is also discussed and identifies the better modulation format and best compensation technique in WDM network.
Citations
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Book ChapterDOI
01 Jan 2019
TL;DR: In this article, the effect of nonlinearity has been investigated with different techniques such as non-return-tozero (NRZ), return-to-zero (RZ), modified duo-binary return to zero (DRZ), and modified MDRZ modulations.
Abstract: In this paper, the effect of nonlinearity has been investigated with different techniques such as non-return-to-zero (NRZ), return-to-zero (RZ), duo-binary return-to-zero (DRZ), and modified duo-binary return-to-zero (MDRZ) modulations. We have explored the fiber nonlinearities by taking dispersion of single-mode optical fiber at 2.5 Gbps communication system with various transmission lengths; i.e., 72–132 km is evaluated with respect to the nonlinearity in fibers. The evaluation is done in terms of Q factor and BER with the 0 dBm input launched power. Along with this pre-compensation, post-compensation and symmetrical compensation techniques are also applied, and it is observed that the Q factor in symmetrical compensation is higher in comparison to the pre-compensation and post-compensation techniques. Therefore, it is examined that nonlinearity effects are less effective in symmetrical compensation instead of pre-compensation and post-compensation.

2 citations

DOI
01 Jan 2018
TL;DR: Exploration of Novel Applications for Optical Communications using Silicon Nanophotonics as mentioned in this paper, is a recent work that explores novel applications for optical communications using silicon nanophotonic technology.
Abstract: Exploration of Novel Applications for Optical Communications using Silicon Nanophotonics

1 citations


Cites background from "Compensation of dispersion in 5 Gbp..."

  • ...This problem becomes even more serious as the data transmission scales to higher rates [144]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the dispersion is a main limiting factor in high speed optical WDM system and three dispersion compensation techniques (pre, post and symmetric using DCF) are compared in terms of different parameters such as Q-factor, BER by using OptiSystem simulator.
Abstract: Wavelength division multiplexing (WDM) technology allows several channels to be routed through the same fiber cable with different wavelengths. In WDM systems dispersion , loss , attenuation , and non-linear effects are the issues that degrade its performance. Dispersion is a main limiting factor in high speed optical WDM system. In this paper 8 channel WDM system at 40Gbps and 125km length of optical fiber with 25 km length of DCF has been investigated for three dispersion compensation techniques i.e. pre , post and symmetric using DCF. All three methods are compared in terms of different parameters such as Q-factor, BER by using OptiSystem simulator .It has been observed that the set-up requires appropriate matching between EDFA gain and length of optical fiber for best performance.
References
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Book
01 Jan 1983
TL;DR: The concept of WDM combined with optical amplifiers has resulted in communication links that allow rapid communications between users in countries all over the world as discussed by the authors, which is known as wavelength division multiplexing (WDM).
Abstract: Optical fibers are used extensively for data transmission systems because of their dielectric nature and their large information-carrying capacity. Network architectures using multiple wavelength channels per optical fiber are utilized in local, metropolitan, or wide-area applications to connect thousands of users having a wide range of transmission capacities and speeds. A powerful aspect of an optical communication link is that many different wavelengths can be sent along a fiber simultaneously in the 1300-to-1600- nm spectrum. The technology of combining a number of wavelengths onto the same fiber is known as wavelength division multiplexing (WDM). The concept of WDM used in conjunction with optical amplifiers has resulted in communication links that allow rapid communications between users in countries all over the world. Keywords: optical fibers; attenuation; photonic systems; WDM; optical amplifiers; dispersion; nonlinear effects

1,447 citations

Journal ArticleDOI
TL;DR: In this article, the authors compare nonreturn-to-zero (NRZ) with return-tozero (RZ) modulation format for wavelength-division-multiplexed systems operating at data rates up to 40 Gb/s.
Abstract: We compare nonreturn-to-zero (NRZ) with return-to-zero (RZ) modulation format for wavelength-division-multiplexed systems operating at data rates up to 40 Gb/s. We find that in 10-40-Gb/s dispersion-managed systems (single-mode fiber alternating with dispersion compensating fiber), NRZ is more adversely affected by nonlinearities, whereas RZ is more affected by dispersion. In this dispersion map, 10- and 20-Gb/s systems operate better using RZ modulation format because nonlinearity dominates. However, 40-Gb/s systems favor the usage of NRZ because dispersion becomes the key limiting factor at 40 Gb/s.

187 citations


"Compensation of dispersion in 5 Gbp..." refers background in this paper

  • ...They are particularly useful maps that help designers tell where to place dispersion compensators in a network....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the authors investigated theoretically and experimentally the transmission performance of a 10 Gb/s repeatered transmission system using dispersion compensating fibers (DCFs), the system configuration that they considered is a 360 km standard (1300 nm zero-dispersion) fiber transmission system with an optical repeater including DCF's located every 120 km (or every 2100 ps/nm dispersion).
Abstract: We have investigated theoretically and experimentally the transmission performance of a 10 Gb/s repeatered transmission system using dispersion compensating fibers (DCFs), The system configuration that we considered is a 360 km standard (1300 nm zero-dispersion) fiber transmission system with an optical repeater including DCF's located every 120 km (or every 2100 ps/nm dispersion). The transmitter was a DFB-laser externally modulated by a zero-chirp LiNbO/sub 3/ modulator with NRZ (non-return to zero), 2/sup 23/-1 PRBS data. The system performance is evaluated in terms of electrical eye margin in the receiver/regenerator. We present a complete description of the system performance including the nonlinear SPM (self-phase modulation) effect in both standard fibers and DCFs. The results of this investigation clearly demonstrate that the use of DCF's is an extremely effective method to overcome the chromatic dispersion in high-speed transmission systems. The main results of this study are (1) the new "eye position method" which presents the eye margin degradation from both "1" and "0" levels as a function of dispersion values describes the system performance more effectively than the conventional "EOP (eye opening penalty) method", (2) a rule of thumb is that the total dispersion must be slightly undercompensated to include the SPM effect, (3) a very wide range of dispersion compensation values offers acceptable system performance, and (4) the "equal modular compensation" which is desirable from a practical point of view provides sufficiently large eye margin (33.3% for 10/sup -15/ BER after 360 km) although the "customized modular compensation" where the dispersion compensation is tailored to achieve the maximum eye margin without considering the performance at the intermediate repeater locations provides the largest eye margin (48.5% for 10/sup -15/ BER).

78 citations


"Compensation of dispersion in 5 Gbp..." refers background in this paper

  • ...(1) An intermediate optical terminal or Optical Add-drop multiplexer: This is a remote amplification site that amplifies the multi-wavelength signal that may have traversed up to 140 km or more before reaching the remote site....

    [...]

Proceedings ArticleDOI
10 Jul 2010
TL;DR: In this article, the most commonly used dispersion compensation fiber (DCF) technology is studied in fiber-optic dispersion and its effect on optical transmission system is analyzed.
Abstract: Fiber-optic dispersion and its effect on optical transmission system are analyzed The most commonly used dispersion compensation fiber (DCF) technology is studied in this article Three schemes (pre-compensation, post-compensation, mix-compensation of dispersion compensation) of dispersion compensation with DCF are proposed The simulation model of the WDM based on the Optisystem is presented according to the above principle The simulation results such as Q factor and BER are given and deeply analyzed It is found that mix- compensation performance is the best And the input fiber power is taken as 9–10dB, the corresponding BER performance is better

70 citations

Journal ArticleDOI
TL;DR: In this article, post, pre and symmetrical/mix dispersion compensation methods were investigated for 40 Gb/s non-return to zero link using standard and dispersion compensated fiber through FBG compensator to optimize high data rate optical transmission.
Abstract: In this paper, We investigate post, pre and symmetrical/mix dispersion compensation methods for 40 Gb/s non-return to zero link using standard and dispersion compensated fiber through FBG compensator to optimize high data rate optical transmission. The influence of dispersion of FBG compensator and increases in the power of CW laser has been studied to evaluate the performance of optical communication systems. The simulation model of the WDM based on the Optisystem 11.0 is presented according to the above principle. The simulation results are validated by analysing the Q-factor and Bit error rate (BER) in the numerical simulator. It is found that post compensation performance is best and the input fiber power is taken as 5-10dB, the corresponding BER performance is better. Keywords - BER, Dispersion compensation, Q-factor, WDM.

24 citations