The evolution of CATV systems employing fiber optics has been both rapid and dramatic. Fiber optic CATV use has made the transition from following and adapting technology developed for telephony to driving fiber optic development. Couple this with the continual and fast changes in fiber optic technology and it is not surprising to have conflicting information when designing a CATV system. This paper presents a review of the major fiber optic technologies and gives some guidelines that can be used in determining the optimal design.