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We propose the in-service upgrade method with ASE dummy lights. Two key technologies, appropriate arrangement of ASE dummy lights and overlap replacement of dummies, can minimize the performance fluctuation of the existing signals in upgrading.
We evaluate the performance of modulation format between Chirped-RZ and Chirped-NRZ in long-haul WDM transmission over distances up to 8200km using non-zero dispersion shifted fibre span.
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