Full Service Access Network using Multimode Fiber
The quest for provisioning larger and larger capacity is sort of "way of life" in telecommunication world.
However, the solution should also conform to the economical considerations. By using multimode fiber for passive optical networks, it can be expected 
that such solution would be attractive, also in economical view, to enhance the possibility of real rollouts. In this case, the fact that 
multimode fiber is more or less easy to handle is advantageous, which means easier setup and maintenance.
Multimode fiber itself puts forward a unique challenge regarding its limited bandwidth-distance product with conventional 
baseband transmission method.  This limitation is by comparison with single-mode fiber. Several methods to overcome this limitation 
have been and are being proposed. One of them is to use subcarrier multiplexing method. It is then necessary to find out the characteristics
 of such system, with the frequency response being the important one. By knowing the characteristics, the aspects such as suitable 
transmission method, network topology, duplexing method and multiple access method can then be determined. Nevertheless, they are subject to 
ongoing improvements for better and better performance.