Fiber-optics are firmly established as the dominant medium of terrestrialtelecommunication infrastructure. Many excellent references and textbookswhich treat this subject in great detail are available. Most of these bookscover device and systems aspects of digital fiber-optic transmission. For thisreason, digital fiber-optic systems will not be a subject of discussion at allin this book. In the current communication infrastructure, a sizeable portionof “access” traffic is carried by Hybrid-Fiber-Coax (HFC) infrastructure [1]which employs subcarrier transmission1 (essentially an analog format)2 to supportboth CATV3 and cable modem Internet access. A similar situation existsin some military radar/communication systems where personnel and signalprocessing equipment is remoted from the physical antennas which are oftenin the way of homing weapons.