Dispersion Tolerance Dispersion tolerance is the maximum allowable quantity of dispersion. The maximum distance the optical signal can travel is the dispersion tolerance divided by the fiber dispersion per unit length. The higher the bit rate, the lower the dispersion tolerance.
Fiber can be single-mode or multimode.
Unfortunately, EDFAs often constrain the available bandwidth. The narrower the channel spacing, the greater the number of channels that can be made available. Unfortunately, narrower channel spacing increases interchannel crosstalk. Modulation Typical choices are AM, FM, PCM, and digital. The link budget is an account of all the sources of loss and gain in the network and is used to calculate the amount of transmission power required for operation.