Gowar’s original edition (circa 1993) does not cover coherent optical transmission or the explosion of DWDM (Dense Wavelength Division Multiplexing). Use his foundation to understand modern texts. Once you understand Gowar’s explanation of a Fabry-Perot laser, moving to a DFB (Distributed Feedback) laser is easy.
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Gowar begins with the electromagnetic theory of light, but unlike pure physics texts, he immediately links Snell’s Law to numerical aperture (NA). He explains why a fiber with a high NA collects more light from an LED, but why that same fiber suffers from higher modal dispersion. Gowar’s original edition (circa 1993) does not cover
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