Abstract
We propose and experimentally demonstrate a novel sub-band multiplexed data architecture for chromatic dispersion (CD) mitigation. We have demonstrated 32 GBaud multi-sub-band (MSB) dual-polarization (DP) 16QAM transmission over 2400 km. Using this approach, the transmitted signal bandwidth is divided into multiple narrow-bandwidth sub-bands, each operating at a lower baud rate. Within each sub-band bandwidth, the CD frequency response can be approximated as a linear-phase band-pass filter, which can be considered as an analog delay that does not require compensation. Therefore, the resulting receiver digital signal processing (DSP) is simplified due to the removal of the CD compensation equalizer. In addition, this leads to efficient parallelization of DSP tasks by deploying multiple independent sub-band processors running at a lower clock rate. The proposed system reduces receiver computational complexity and offers 1 dB higher Kerr-nonlinearity tolerance and 2% extended transmission reach in comparison to the conventional single carrier systems.
Highlights
To satisfy the ever-increasing capacity demand in optical fiber communications, both the spectral efficiency and the data rate carried by individual wavelength division multiplexed channels have to be increased
Discussion and results we investigate the performance of multi-sub-band (MSB) architecture against conventional single carrier (SC) systems
The proposed concept is based on digitally partitioning the optical channel bandwidth into multiple sub-bands in order to process data in parallel and mitigate chromatic dispersion (CD)
Summary
To satisfy the ever-increasing capacity demand in optical fiber communications, both the spectral efficiency and the data rate carried by individual wavelength division multiplexed channels have to be increased. We used a conventional timedomain SC equalizer applied to each sub-band individually rather than using the frequencydomain DFTS-OFDM channel equalization technique This approach allowed us to eliminate the CP overhead and improve the spectral efficiency. For a 32 GHz channel, we have find the number of sub-bands at different transmission distance required to fully mitigate the effects of CD and to remove the CD compensation equalizer at the receiver This method allows for a significant reduction of the receiver DSP computational complexity and it offers a simplified implementation for flexible optical transceivers. Each sub-band is considerably flatter in its frequency response due to its narrow bandwidth, which implies smaller channel eigenvalue spread They maintain faster and more accurate convergence for their adaptive filter coefficients in comparison to full-band conventional single carrier systems.
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