If you are an engineering student preparing for a job in fiber optic networks (e.g., at Cisco, Nokia, OFS, or a telecom operator), you need both: a modern reference (like Agrawal for nonlinear effects) and a conceptual foundation.
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Another frequent point of comparison is with Gerd Keiser's Optical Fiber Communications , a well-known introductory text. The difference in their philosophies is stark: If you are an engineering student preparing for
: Explains light propagation through total internal reflection. or a telecom operator)