thanks alistu,
yes i see, but my problem is how to find a theorical relation between the bit rate and the bande width?
for example : for 155Mbps we see Bmax= 80 GHz;
for 1Gbps we see Bmax= 500 GHz;
for 1OGbps we see Bmax = 5THz;
how calculate this values by theory.
regards