Nov 2026· IEEE Photonics Technology Letters· Vol 38, pp. 1876-1879· 0 citations· 15 references
Abstract
The surge in data traffic catalyzed by generative artificial intelligence(AI) and 5G/6G services has placed unprecedented demand on data center interconnects (DCI). To meet these requirements, coherent optical systems for DCI applications are rapidly scaling toward higher baud rates and advanced modulation formats, necessitating more efficient digital signal processing (DSP) to balance performance and complexity, especially in chromatic dispersion (CD) compensation. We investigate a joint pulse shaping and CD pre-compensation (JPS-CD) architecture for coherent DCI systems. By exploiting the DFT scaling property and the spectral sparsity of low-roll-off raised-cosine pulse shaping, JPS-CD reduces unnecessary frequency-domain multiplications outside the occupied signal bandwidth. We further show that pure CD pre-compensation increases the waveform PAPR and reduces the transmitter SNR after peak normalization; therefore, a low-complexity square boundary clipping (SBC) algorithm is introduced to mitigate this limitation. Simulation and experimental results show that JPS-CD reduces the real multiplication complexity by about 41% while maintaining comparable performance.
Driven by emerging high-bandwidth applications including 5G and cloud computing, the continual explosion of data traffic threatens to push optical fiber transmission systems up against their capacity limits. In addition, coherent optical communication with advanced digital signal processing (DSP) demonstrates almost pe...
Zai-Sheng Wang, Xin-Yue Xia· ITM Web of Conferences· 0 citations
A novel low complexity carrier recovery system for baudrate sampled coherent datacenter links is presented. By separating the phase contributions from residual frequency offset and laser phase noise, this system reduces the required number of complex multiplications for frequency recovery by 50% and for phase recovery...
Jonas De Busscher, A. Bomhals, G. Coudyzer et al.· Journal of Lightwave Technol...· 0 citations
This work presents a real-time coherent receiving algorithm for 32Gbaud low-complexity DP-QPSK signals and deploys it on a single FPGA for datacenter scale-across interconnects. This real-time hardware algorithm, with a 5/4 samples per symbol (SPS) frequency-domain timing recovery algorithm (TR), a 1 SPS frequency-doma...
Kai-Yang Dong, Hong-Yi Gan, Xue-Feng Zou et al.· Journal of Lightwave Technol...· 0 citations
Integrated sensing and communication (ISAC) is expected to play a key role in future sixth-generation (6G) networks, where random data-bearing signals are reused to support both communications and sensing, thereby improving time-frequency utilization. In practice, the high peak-to-average power ratio (PAPR) of conventi...
Jing-Cheng Shi, Yi-Feng Xiong, Zexuan Jing et al.· IEEE Transactions on Communi...· 1 citation
The rapid growth of data-center traffic is driving demand for high-capacity and spectrally efficient optical interconnects. Single-sideband (SSB) transmission with high-order quadrature amplitude modulation (QAM) is attractive for scale-across direct-detection links, because it avoids dispersion-induced power fading. H...
It is shown, through simulations and experimental validations, that for a 40~Gb/s 10~km link, decision trees can outperform by 0.5--1~dB conventional linear equalization, with negligible hardware requirements, and that an E2E technique based on transformers can provide a gain up to 6~dB, highlighting the potential of j...
Luca Poì, Stella Civelli, M. Secondini et al.· 0 citations
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