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Much of this book was generated from the experience of the authors in the optical networking industry. However, much of the text was inspired from the following works. Some of them are an excellent source for further information if you are interested in developing your understanding of the subject. Most of the works are authored either by industry leaders in technology or by leading academicians.
Agrawal, G. P. Fiber-Optic Communication Systems. Wiley Interscience, 1992.