The major objective of this article is to know about Optical Fiber Communication Systems. There are lots of types of communication systems nowadays. Among all these, the optical fiber communication system features a place of its individual. An optical fiber communication system has several attractive features that make it more simple to use. To many, the benefits of this system have helped it to gain so much popularity. Here explain on Enormous Potential Bandwidth, Small Weight and Size, Electrical Isolation, Interference and Crosstalk Immunity. Security of the Signal, Low Transmission Loss, Flexibility and Ruggedness, Easy Maintenance and System Reliability and Potential Low Cost.