John Gowar’s Optical Communication Systems is like a vintage tool in a CNC workshop. It isn't flashy, and it won't assemble a full 5G fronthaul network for you, but when you need to fix a broken link budget or understand a noise figure, Gowar is the master.
In-depth analysis of propagation in dielectric waveguides, material dispersion, and attenuation mechanisms. Optoelectronic Components: optical communication systems john gowar pdf better