Multistage Amplified and Dispersion Compensated Ultra-long Haul DWDM Link with High OSNR

A multistage amplified and dispersion compensated Dense Wavelength Division Multiplexed (DWDM) ultra-long haul optical network is proposed, with a capacity of
$8\times 11$
Gbps. The network dispersion is mitigated in multiple spans to make ultra-long haul communication possible. Multistage amplifiers allow signal amplification in intervals, making the system less prone to non-linearity. The position and gain of amplifiers are optimized thoroughly, to attain a high OSNR (Optical Signal to Noise Ratio). The Q-factor penalty and power penalty of the system are investigated analytically. All the DWDM limitations are taken care of while designing the network. Finally, the propagation distance of 700km, with a Quality factor of 7.06, permissible BER and a commendable OSNR, is achieved.