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Single wavelength 56Gbps transmission in 640km dispersion-unmanaged link is successfully realized by using direct-detection discrete multi-tone (DMT) modulation method. A single polarization IQ modulator is used to do chromatic dispersion pre-compensation and generate single sideband (SSB) DMT signal. Just one PIN is used to detect the received signal to reduce the cost. More than 3000ps/nm chromatic...
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 evaluate the performance of nonredundant differential decoding schemes under linear and nonlinear channel conditions with various neighbor channels based on measured data. Each method is analyzed with respect to its systematic back-to-back performance, its nonlinear tolerance, its implementation complexity, and its compatibility to soft-decision (SD) forward error correction (FEC). All schemes...
We successfully realized layered decoding for LDPC convolutional codes designed for application in high speed optical transmission systems. A relatively short code with 20% redundancy was FPGA-emulated with a Q-factor of 5.7dB at BER of 10−15.
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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