Entropy-loaded digital subcarrier multiplexing transmission adaptive to the loss-spectrum ripples of hollow-core fiber
适应空芯光纤损耗谱波动的熵加载数字副载波复用传输
エントロピー負荷デジタルサブキャリア多重伝送、空洞コアファイバーの損失スペクトルリップルに適応
엔트로피 로드 디지털 서브캐리어 다중화 전송, 허ollow-core 광섬유의 손실 스펙트럼 리플에 적응
Transmisión por subportadora digital cargada con entropía adaptada a las ondulaciones del espectro de pérdida de la fibra de núcleo hueco
Transmission par multiplexage de sous-porteuses numériques chargées d'entropie adaptée aux ondulations du spectre de perte de la fibre creuse
Адаптивная передача с цифровым субнесущим мультиплексированием, нагруженная энтропией, для спектральных колебаний потерь в полым сердечником волокна
Hailin Yang 杨海林 ¹ ² ³, Meng Xiang 向梦 ¹ ² ³, Cong Zhang 张聪 ¹ ² ³, Lipeng Feng 冯立鹏 ⁴, Peng Li 李鹏 ⁵, Lei Zhang 张磊 ⁵, Jie Luo 罗杰 ⁵, Jianping Li 李建平 ¹ ² ³, Songnian Fu 付松年 ¹ ² ³, Yuwen Qin 秦玉文 ¹ ² ³
¹ Institute of Advanced Photonics Technology, School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China
中国 广州 广东工业大学信息工程学院先进光子技术研究院
² Key Laboratory of Photonic Technology for Integrated Sensing and Communication, Ministry of Education of China, Guangdong University of Technology, Guangzhou, 510006, China
中国 广州 广东工业大学通感融合光子技术教育部重点实验室
³ Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou, 510006, China
中国 广州 广东工业大学 广东省信息光子技术重点实验室
⁴ China Telecom Research Institute, State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Beijing, 102209, China
中国 北京 中国电信研究院 光纤光缆制备技术国家重点实验室
⁵ State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Yangtze Optical Fibre and Cable Joint Stock Limited Company (YOFC), 430073, China
中国 武汉 长飞光纤光缆股份有限公司 光纤光缆制备技术国家重点实验室
Hollow-core fibers (HCFs) are promising candidates for photonic data-center interconnects (DCIs) owing to their low loss, low latency, ultra-low nonlinearity, low dispersion, and broad transmission window. However, loss-spectrum ripples significantly constrain both the usable bandwidth and the achievable capacity.
To address such issue, we propose and experimentally demonstrate an entropy-loaded digital subcarrier multiplexing (DSM) transmission scheme over the nested anti-resonant nodeless fiber (NANF).
Here, dynamic entropy is allocated to each subcarrier (SC) based on the signal-to-noise ratio (SNR) variation induced by the loss-spectrum ripples. For single-channel transmission centered at 1550.12 nm, entropy-loaded probabilistic constellation shaping dual-polarization 256 quadrature amplitude modulation (PCS-DP-256QAM) DSM signals can realize a net bit-rate of 613.3 Gbit/s adaptive transmission over 2 km NANF having a peak-to-peak loss-spectrum ripple of 0.4 dB within a channel spacing of 0.51 nm. Meanwhile, this transmission remains nonlinear impairment-free even at a record-high launch power of 39 dBm.
Furthermore, we demonstrate 40-channel dense wavelength division multiplexing (DWDM) DSM transmission over 10 km NANF, achieving a net bit-rate of more than 602.7 Gbit/s per wavelength and a total capacity of 24.14 Tbit/s, when the entropy-loaded PCS-DP-256QAM DSM signals are individually generated under a peak-to-peak loss-spectrum ripple of 0.7 dB over the extended C-band. Compared with conventional uniform-entropy DSM, our proposed scheme enhances the aggregate capacity by 18.28%. Such an innovative transmission scheme adaptive to broadband loss-spectrum ripples effectively unlocks the HCF full potential for photonic DCIs.
