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A novel coded modulation scheme which adaptively supports multiple modulation formats for software defined networks is proposed. With the same fundamental FEC architecture, alterable bitrates can be compatibly implemented without additional hardware recourses and performance penalty.
We discuss implementation aspects of LDPC based soft-decision FEC schemes for high speed optical systems. Several BICM schemes with LDPC convolutional codes are proposed and compared in respects of both performance and implementation complexity.
We present FPGA-based emulation results of a single QC-LDPC code with 20% redundancy designed for applications in 100 Gb/s optical transmission systems. Error floor-free transmission can be achieved at BER of 10-15 with a Q factor of 5.9 dB.
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