Optical Amplification-Free Deep Reservoir Computing-Assisted High Baudrate Short Reach Communication
Optics Letters 2023
Mengyao Han, Muguang Wang, Yuchuan Fan, Toms Salgals, Hadrien Louchet, Richard Schatz, Markus Gruen, Fabio Pittala, Benjamin Kruger, Thomas Dippon, Lu Zhang, Sandis Spolītis, Xianbin Yu, Vjačeslavs Bobrovs, Sergei Popov, Xiaodan Pang, Oskars Ozoliņš

An optical amplification-free deep reservoir computing (RC)-assisted high baudrate intensity modulation direct detection (IM/DD) system is experimentally demonstrated using a 100G externally modulated laser operated in C-band. We transmit 112 Gbaud 4-level pulse amplitude modulation (PAM4) and 100 Gbaud 6-level PAM (PAM6) signals over 200-m single-mode fiber (SMF) link without any optical amplification. The decision feedback equalizer (DFE), shallow RC, and deep RC are adopted in the IM/DD system to mitigate impairment and improve transmission performance. Both PAM transmissions over 200-m SMF with bit error rate (BER) performance below 6.25% overhead hard-decision forward error correction (HD-FEC) threshold are achieved. Besides, the BER of the PAM4 signal is below KP4-FEC limit after 200- m SMF transmission enabled by the RC schemes. Thanks to the use of a multiple-layer structure, the number of weights in deep RC has been reduced by about 50% compared with the shallow RC, whereas the performance is comparable. We believe that the optical amplification-free deep RC-assisted high baudrate link has a promising application in intra-data center communications.


Han, M., Wang, M., Fan, Y., Salgals, T., Louchet, H., Schatz, R., Gruen, M., Pittala, F., Kruger, B., Dippon, T., Zhang, L., Spolītis, S., Yu, X., Bobrovs, V., Popov, S., Pang, X., Ozoliņš, O. Optical Amplification-Free Deep Reservoir Computing-Assisted High Baudrate Short Reach Communication. Optics Letters, 2023, Vol. 48, No. 8, 1.-5.lpp. ISSN 0146-9592. e-ISSN 1539-4794. Pieejams: doi:10.1364/OL.485830

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