AI Article Synopsis
- The study shows that using dual-polarization quadrature duobinary modulation enables digital backward propagation (DBP) for high-speed transmission (112Gbit/s) over long distances (1640km) with reduced complexity.
- It compares single-channel and multi-channel setups, indicating that a multi-channel system with ten transmitters can operate effectively without in-line optical dispersion compensation.
- The findings suggest that this approach not only maintains performance but also reduces computational demands by 60% compared to traditional modulation methods, enhancing the system's tolerance to transmission impairments.
Article Abstract
We numerically report on the complexity reduction of digital backward propagation (DBP) by utilizing correlative encoded transmission (dual-polarization quadrature duobinary) at a bit-rate of 112Gbit/s over 1640km fiber link. The single channel (N=1) and multi-channel (N=10) transmission performances are compared in this paper. In case of multi-channel system, 10 transmitters are multiplexed with 25GHz channel spacing. The fiber link consists of Large A(eff) Pure-Silica core fiber with 20 spans of 82km each. No in-line optical dispersion compensator is employed in the link. The system performances are evaluated by monitoring the bit-error-ratio and the forward error correction limit corresponds to bit-error-ratio of 3.8×10(-3). The DBP algorithm is implemented after the coherent detection and is based on the logarithmic step-size based split-step Fourier method. The results depict that dual-polarization quadrature duobinary can be used to transmit 112Gbit/s signals with an spectral efficiency of 4-b/s/Hz, but at the same time has a higher tolerance to nonlinear transmission impairments. By utilizing dual-polarization quadrature duobinary modulation, comparative system performance with respect to dual-polarization 16-quadrature amplitude modulation transmission can be achieved with 60% less computations and with a step-size of 205km.
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| http://dx.doi.org/10.1364/OE.21.000781 | DOI Listing |
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