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Study On The Application Of Edfa In High Speed Optical Fiber Communication System

Posted on:2011-04-24Degree:MasterType:Thesis
Country:ChinaCandidate:Q Y YuFull Text:PDF
GTID:2208330332478850Subject:Communication and Information Engineering
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In recent years, optical fiber amplifiers used for ultras-high speed optical fiber communication systems become an important research topic in the field of optical fiber communication technology. With the rapid development and applications of the erbium-doped fiber amplifier and the DWDM technology in optical fiber communications, EDFA would find more and more application in future high-speed and long-haul optical fiber communication systems due to its high gain, high output power, gain characteristics of stability, gain and polarization-independent and many other unique advantages. EDFA have developed rapidly because of the demand of optical fiber communication, therefore, the main contents of this thesis are as follows:1,In this dissertation, relevant theories of conventional optical fiber are explained first. A basic equation which governs propagation of optical pulse in single mode fibers is obtained on the basis of the Maxwell's Equations, and analyses are conducted for the influence of several factors and circumstances on optical pulse propagation in optical fibers. We explain the split-step Fourier method in detail and use it to perform numeric simulation of ultrashort pulse propagation in fibers.2,The structure of EDFA and its principle of optical pulse amplification are introduced in detail. The applications of the EDFA in optical fiber communication systems are also discussed. EDFA is considered to be the main device for ultrashort optical pulse amplification owing to its high gain, broad bandwidth, and high pulse-saturation energy. Therefore, EDFA-based ultrashort optical pulse amplification techniques are reviewed and discussed, with the emphasis on how to reduce the fiber nonlinear effects on the amplification of ultrashort optical pulse. The latest achievements in this field are also introduced.3,We numerically studied ultrashort optical pulse amplification in EDFA using the split-step Fourier method. We found that the effect of the gain dispersion not only decreases the amplification factor but also leads to symmetric splitting of the amplified pulses. Pulse splitting becomes more and more severe when the length or the gain in the EDFA increases. We proposed a method that based on a gain-distributed erbium-doped fiber loop mirror to suppress the gain dispersion effect and show that, in this case, amplified optical pulse with high quality can be obtained even with a longer loop mirror or higher gain.4,Using the split-step Fourier method, we show that high-quality compressed pulses with negligible pulse pedestal can be obtained by the use of the gain-distributed erbium-doped fiber loop mirror. We also show that optical pulse train simultaneously amplified can successfully achieve long propagation distance in the single-mode fiber and can decrease the BER. Furthermore, one can obtain high-quality pulse with the appropriated length of erbium-doped fiber mirror.
Keywords/Search Tags:erbium-doped fiber amplifier(EDFA), ultrashort optical pulse, fiber nonlinear effects, gain dispersion, erbium-doped fiber loop mirror
PDF Full Text Request
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