Abstract
Optical superchannels and digital nonlinear mitigation are key technology options to be considered for the deployment of next-generation optical 400G transmission systems. In this paper, we experimentally assess the performance and complexity of multicarrier digital backpropagation (DBP) for dual- and triple-carrier 400G superchannels based on polarization-multiplexed (PM) 16QAM and 64QAM modulation. As an alternative to the widely used nonlinear compensation based on total-field DBP, we demonstrate that a coupled-equations DBP (CE-DBP) approach can be more computationally efficient and also more robust to a nonideal equalization of the receiver front-end in scenarios with limited sampling rate and electrical bandwidth. Employing a triple-carrier PM-16QAM superchannel placed in a 75-GHz slot of a WDM system, we demonstrate an ultralong-haul signal reach of 6600 km using CE-DBP, corresponding to 32% increase relatively to chromatic dispersion equalization (CDE). Targeting an highly spectral-efficient solution for 400G transmission in metro optical networks, these results are extended to a triple-carrier PM-64QAM superchannel placed in a 50-GHz slot, yielding a maximum signal reach of 1750 km through the use of CE-DBP in single-superchannel propagation, corresponding to approximately 60% increase over CDE.
© 2015 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription