Optical transceiver imperfection including device bandwidth limitation, various tributary imbalances and even the PCB induced long-memory ripple and tributary crosstalk is one of the biggest obstacles impeding the high-order QAM coherent systems towards 100GBaud and beyond. Generally, the static imperfections could be calibrated at the preservice stage. The dynamic imperfections should be handled at the in-service stage. This talk will firstly review the instrument-free calibration process for the pre-service stage. Then various digital monitors for diagnosis and fault allocation either at pre-service stage or in-service stage, relying on the inherent monitoring function of receiver-side digital equalizers and the machine learning tool, will also be reviewed.
The high complexity of conventional intra-channel nonlinearity compensation algorithms, such as back-propagation,
is considered as the major obstacle for the implementation. To reduce the complexity, perturbation analysis is
applied because it considers multi-span transmission as one stage. In those perturbation based algorithms, such as
perturbation back-propagation (PBP) and perturbation pre-distortion, the number of required compensation stage is
much less than that of conventional back-propagation. To reduce the complexity further, the multi-tap finite impulse
response filter (FIR) in PBP is replaced with one-tap infinite impulse response (IIR) filter. The number of required
compensation stage of IIR PBP is only 15% of conventional back-propagation, whereas the complexity of each stage
is almost same. In perturbation pre-distortion, the proposed perturbation combination reduces the number of terms
from 19732 to 41, whereas no performance degradation is observed.
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