Fiber-Optic Communication Systems by Govind P. Agrawal

By Govind P. Agrawal

This ebook offers a entire account of fiber-optic verbal exchange structures. The 3rd variation of this booklet is used world wide as a textbook in lots of universities. This 4th variation accommodates contemporary advances that experience happened, specifically new chapters. One offers with the complex modulation codecs (such as DPSK, QPSK, and QAM) which are more and more getting used for bettering spectral potency of WDM lightwave structures. the second one chapter focuses on new recommendations akin to all-optical regeneration which are below improvement and certain for use in destiny conversation structures. All different chapters are up-to-date, besides.

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5, a large number of transoceanic lightwave systems have already been installed to create an international fiber-optic network. Short-haul telecommunication applications cover intracity and local-loop traffic. Such systems typically operate at low bit rates over distances of less than 10 km. The use of single-channel lightwave systems for such applications is not very cost-effective, and multichannel networks with multiple services should be considered. The concept of a broadband integrated-services digital network requires a high-capacity communication system capable of carrying multiple services.

However, the situation changed drastically in 1970 when, following an earlier suggestion [9], the loss of optical fibers was reduced to below 20 dB/km [10]. 55-µ m spectral region [11]. The availability of low-loss fibers led to a revolution in the field of lightwave technology and started the era of 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 the role of optical fibers as a communication channel in lightwave systems.

33) can be solved numerically to determine the propagation constant β . In general, it may have multiple solutions for each integer value of m. It is customary to enumerate these solutions in descending numerical order and denote them by β mn for a given m (n = 1, 2, . . ). Each value β mn corresponds to one possible mode of propagation of the optical field whose spatial distribution is obtained from Eqs. 32). Since the field distribution does not change with propagation except for a phase factor and satisfies all boundary conditions, it is an optical mode of the fiber.

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