Tài liệu Fibre optic communication systems P2 pdf

... channel powers in optical communication systems are typically below 10 mW, SRS is not a limiting factor for single-channel lightwave systems. However, it affects the performance of WDM systems considerably; ... fiber -optic communications. Several books devoted entirely to optical fibers cover numerous advances made in their design and understanding [12]–[21]. This chapter focuses on th...

Ngày tải lên: 24/12/2013, 01:16

... is preserved quite well even after 416 CHAPTER 9. SOLITON SYSTEMS 9.2.4 Soliton Transmitters Soliton communication systems require an optical source capable of producing chirp- free picosecond ... into an optical bit stream in the RZ format [53]. Although optical pulses launched from such transmitters typically do not have the “sech” shape of a soliton, they can be used for soliton sys...

Ngày tải lên: 21/01/2014, 06:20

... of the resulting optical signal. Most digital lightwave systems employ OOK in combination with PCM. 1.3 Optical Communication Systems As mentioned earlier, optical communication systems differ ... communication systems currently use optical fibers, the commonly used term for them is fiber -optic communication systems. The term lightwave system is also sometimes used for fiber -...

Ngày tải lên: 24/12/2013, 01:16

... recombination time associated with stimulated emission. Most fiber -optic communication systems use semiconductor lasers as an optical source because of their superior performance compared with ... 1.55- µ m optical communication systems operating at bit rates of 2.5 Gb/s or more. DFB lasers are reliable enough that they have been used since 1992 in all transoceanic lightwave systems...

Ngày tải lên: 24/12/2013, 01:16

... 14. [5] B. L. Kasper, in Optical Fiber Telecommunications II, S. E. Miller and I. P. Kaminow, Eds., Academic Press, San Diego, CA, 1988, Chap. 18. [6] S. B. Alexander, Optical Communication Receiver ... G. 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...

Ngày tải lên: 24/12/2013, 01:16

... third-generation systems operating near 1.55 µ m and can exceed 100 (Tb/s)-km for the fourth-generation systems. 5.1.2 Distribution Networks Many applications of optical communication systems require ... constitute a basic element of all communication systems, including LANs, MANS, and other distribution networks. 5.2 Design Guidelines The design of fiber -optic communication s...

Ngày tải lên: 24/12/2013, 01:16

... issues for long-haul systems employing a cascaded chain of optical amplifiers. 6.5.1 Optical Preamplification Optical amplifiers are routinely used for improving the sensitivity of optical receivers by ... example, ∆ ν g ∼5 THz for semiconductor optical amplifiers for which T 2 ∼60 fs. Amplifiers with a relatively large bandwidth are preferred for optical communication systems because the ga...

Ngày tải lên: 21/01/2014, 06:20

... Chapter 6 that with the advent of optical amplifiers, fiber losses are no longer a major limiting factor for optical communication systems. Indeed, mod- ern lightwave systems are often limited by the ... provided by the third-generation terrestrial systems operating near 1.55 µ m and using optical transmitters containing a distributed feedback (DFB) laser. Such systems generally use th...

Ngày tải lên: 21/01/2014, 06:20

... Channel selection through a tunable optical filter. 8.2 WDM Components The implementation of WDM technology for fiber -optic communication systems re- quires several new optical components. Among them ... signal is in the electric form for electro -optic demultiplexing but consists of an optical pulse train for all-optical demultiplexing. The electro -optic technique uses several MZ-type...

Ngày tải lên: 21/01/2014, 06:20

... Persoinick, Eds., Coherent Lightwave Communications, IEEE Press, Piscataway, NJ, 1990. [15] S. Betti, G. de Marchis, and E. Iannone, Coherent Optical Communication Systems, Wi- ley, New York, 1995. [16] ... 1995. [16] S. Ryu, Coherent Lightwave Communication Systems, Artec House, Boston, 1995. [17] F. Heismann, S. K. Korotky, and J. J. Veselka, in Optical Fiber Telecommunications III, V...

Ngày tải lên: 21/01/2014, 06:20