Backbone optical communication system capacity

 

System capacity calculation model for long-distance trunk lines:

 

 

A 2.5G DWDM system with 160 channels can achieve a transmission rate of 400Gb/s.

Similarly, 320 channels can achieve a transmission rate of 800Gb/s.

A 40G system with 320 channels would have a capacity of 12.8 Tb/s.

 

n transmission system model with n-segment amplifier connections:

 

Long-distance backbone or submarine cable transmission generally requires repeaters.

The optical signal-to-noise ratio calculation model for transmission:

 

The curves for the number of channels and optical power vary depending on the relay distance, involving a balance between nonlinear effects and amplifier costs.

 

 

Long repeater distances require fewer amplifiers, saving money.

High output optical power is required, but nonlinear effects exist.

Short repeater distances avoid nonlinear effects, but the number of channels increases, leading to higher costs.