communication systems solution
Principles of Digital Communication Systems and Computer Networks
... MSSV:08520582-TRƯƠNG VĂN VĨ MSSV:08520470Sau đây là bài dịch chương II trong sách “Principles of Digital Communication Systems and Computer Networks” của nhóm em.Phần I – Các hệ thống truyền thông số(Digital ... trọng cho mỗi kỹ sư truyền thông.Tài liệu tham khảoC. E. Shannon. "A Mathematical Theory of Communication. " Bell System Technical Journal, Vol. 27, 1948.Tất cả các kỹ sư truyền thông ... Shannon đặt nền móng về lý thuyết thông tin năm 1948. Cuốn sách của ông “A Maththemathical Theroy of Communication ” (Một lý thuyết toán học của sự truyền thông tin) được xuất bản trong Tạp chí Bell...
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Tài liệu Fibre optic communication systems P1 doc
... digital lightwave systems employ OOK incombination with PCM.1.3 Optical Communication Systems As mentioned earlier, optical communication systems differ in principle from mi-crowave systems only ... lightwave systems canexceed by a factor of 107compared with the first-generation lightwave systems. 1.1.2 Evolution of Lightwave Systems The research phase of fiber-optic communication systems ... system. Itconsists of a transmitter, a communication channel, and a receiver, the three elementscommon to all communication systems. Optical communication systems can be clas-sified into two broad...
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Tài liệu Fibre optic communication systems P2 pdf
... powers in optical communication systems are typically below 10 mW, SRSis not a limiting factor for single-channel lightwave systems. However, it affects theperformance of WDM systems considerably; ... (2.2.23)Equation (2.2.21) has a solution of the form Z = exp(iβz), whereβhas the physicalsignificance of the propagation constant. Similarly, Eq. (2.2.22) has a solution Φ =exp(imφ), but ... understanding [12]–[21]. This chapter focuses on the role of optical fibersas a communication channel in lightwave systems. In Section 2.1 we use geometrical-optics description to explain the...
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Tài liệu Fibre optic communication systems P3 pptx
... 1.55-µm optical communication systems operating at bit rates of2.5 Gb/s or more. DFB lasers are reliable enough that they have been used since 1992in all transoceanic lightwave systems. 3.4.2 ... transversemodes. [85]. In the absence of fiber dispersion, MPN would be harmless for optical communication systems, as all modes would remain synchronized during transmis-sion and detection. However, ... because of a short recombination time associated with stimulated emission.Most fiber-optic communication systems use semiconductor lasers as an optical sourcebecause of their superior performance...
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Tài liệu Fibre optic communication systems P4 doc
... nonetheless useful for optical communication systems simply because of their higher sensitivity. Receiver sensitivity is an importantissue in the design of lightwave systems and is discussed next.4.5 ... Forrest, in Optical Fiber Telecommunications II, S. E. Miller and I. P. Kaminow,Eds., Academic Press, San Diego, CA, 1988, Chap. 14.[5] B. L. Kasper, in Optical Fiber Telecommunications II, S. E. ... Swartz, in Optical Fiber Telecommunications II, S. E. Miller and I. P. Kaminow,Eds., Academic Press, San Diego, CA, 1988, Chap. 20.[54] K. Kobayashi, in Optical Fiber Telecommunications II, S. E....
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Tài liệu Fibre optic communication systems P5 doc
... third-generation systems operating near 1.55µm andcan exceed 100 (Tb/s)-km for the fourth-generation systems. 5.1.2 Distribution NetworksMany applications of optical communication systems require ... constitute a basic element of all communication systems, including LANs, MANS, and other distribution networks.5.2 Design GuidelinesThe design of fiber-optic communication systems requires a clear understanding ... lightwave systems are loss-limited, rather than dispersion-limited, for bit ratesup to 100 Mb/s when graded-index fibers are used. The first generation of terrestrialtelecommunication systems took...
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Tài liệu PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS ppt
... the potential capabilities of spread-spectrum communication systems. Although direct-sequence systems greatlysuppress interference, practical systems require channel codes to deal with theresidual ... ProbabilityComplex-Valued Quaternary Sequences6.2 Systems with Random Spreading SequencesDirect-Sequence Systems with PSKQuadriphase Direct-Sequence Systems 6.3Wideband Direct-Sequence Systems Multicarrier Direct-Sequence ... FieldLong Nonlinear Sequences2.3 Systems with PSK ModulationTone Interference at Carrier FrequencyGeneral Tone InterferenceGaussian Interference2.4Quaternary Systems 2.5Pulsed Interference2.6Despreading...
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Tài liệu Fibre optic communication systems P6 ppt
... the bit slot, resultingin a tolerable value of the jitter of 8 ps for 10-Gb/s systems and only 2 ps for 40-Gb/s systems. Clearly, the average dispersion of a fiber link should nearly vanish if ... signal wavelengths near 1.12µm. However, the wavelengthsof most interest for fiber-optic communication systems are near 1.3 and 1.5µm. A6.4. ERBIUM-DOPED FIBER AMPLIFIERS251Figure 6.15: (a) ... which T2∼60 fs.Amplifiers with a relatively large bandwidth are preferred for optical communication systems because the gain is then nearly constant over the entire bandwidth of even amultichannel...
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Tài liệu Fibre optic communication systems P7 ppt
... amplifiers, fiber lossesare no longer a major limiting factor for optical communication systems. Indeed, mod-ern lightwave systems are often limited by the dispersive and nonlinear effects ratherthan ... compensatedusing DCFs [138].7.9 High-Capacity Systems Modern WDM lightwave systems use a large number of channels to realize a systemcapacity of more than 1 Tb/s. For such systems, the dispersion-management ... each map period is not the best solution in thepresence of nonlinear effects. A numerical approach is often used to optimize thedesign of dispersion-managed systems [115]–[124]. In general,...
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Tài liệu Fibre optic communication systems P8 docx
... in the electrical domainto obtain digital hierarchies for telecommunication systems. In this sense, even single-channel lightwave systems carry multiple TDM channels. The electrical TDM becomesdifficult ... that the FWM-induced crosstalk is minimized.8.3.7 Other Design IssuesThe design of WDM communication systems requires careful consideration of manytransmitter and receiver characteristics. ... [203]. Such frequency changes are generally not of concern forsingle-channel systems. In the case of WDM lightwave systems it is important that thecarrier frequencies of all channels remain stable,...
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Tài liệu Fibre optic communication systems P9 pdf
... the soliton is preserved quite well even after416CHAPTER 9. SOLITON SYSTEMS 9.2.4 Soliton TransmittersSoliton communication systems require an optical source capable of producing chirp-free ... [62]–[66].Modeling of soliton communication systems making use of distributed amplifica-tion requires the addition of a gain term to the NLS equation, as in Eq. (9.3.4). In thecase of soliton systems operating ... [62]–[66].420CHAPTER 9. SOLITON SYSTEMS Figure 9.10: (a) Lumped and (b) distributed amplification schemes for compensation of fiberlosses in soliton communication systems. 9.3.2 Lumped AmplificationThe...
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