Upgrading existing optical fibre plants to higher bit-rates

摘要: To upgrade existing conventional fibre lines to very high data rates, effective methods of coping with the chromatic dispersion problem are therefore needed. Several techniques for compensation have been suggested so far. They include use externally modulated chirp-free transmitters, pre-chirping transmitter laser, supported transmission, midpoint spectral inversion, compensating fibres, chirped gratings, nonlinear optical techniques, etc. In this paper those above mentioned which seem be more mature discussed and compared. particular, attention is focused on soliton propagation inversion. Their practical implementation effectiveness also demonstrated describing transmission experiments both laboratory field test beds.