Given that the last major printing of Optical Communication Systems by John Gowar was in 1993 (with a 2nd edition reprint in 1996), physical copies are rare, expensive, or relegated to university library basements. Consequently, the has become the de facto standard for modern learners.
In short: The “long story” is that Gowar’s book is a hidden gem — better for practical system design intuition than its more famous rivals. The difficulty is that its PDF is not legally free, and physical copies are scarce. But for those who get it, it’s a career reference. optical communication systems john gowar pdf better
You likely mean the book "Optical Communication Systems" by John Gowar. Brief review: Given that the last major printing of Optical
Gowar flips the script. He introduces the and rise-time budget within the first 100 pages. He forces the reader to ask the engineering question: “Given a transmitter and receiver, how far can I send data?” This top-down approach is pedagogically superior. You learn the physics because you need it to solve the budget, not the other way around. The difficulty is that its PDF is not