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Quantum Dot Comb Lasers with Optical Feedback Enhanced DWDM Transmission

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posted on 2024-05-14, 07:50 authored by Zihao Wang, xiangru Cui, jiajian chen, Jing-Zhi Huang, Bo Yang, Jiale Qin, Wenlu Wang, Jianan Duan, Ting Wang, Jianjun Zhang
Feedback-insensitive Quantum Dot (QD) comb lasers hold significant promise for integrated dense wavelength division multiplexing (DWDM) photonic systems due to their ability to generate multiple wavelengths and operate without bulky isolators, facilitating the development of high-density and large-scale photonic integrated circuits (PICs). In this study, we investigated the optical feedback (OFB) influence of InAs/GaAs QD comb laser from various perspectives. Our findings reveal that the comb laser exhibits a stable locking region with consistent optical spectra across a range of OFB strengths (-45 dB to -10 dB). Furthermore, under high OFB strength of -10 dB, there is a notable 40 dB suppression of relative intensity noise (RIN) in the low-frequency range (below 1 GHz). Transmission experiments demonstrate clear eye openings at 25 Gbps using a bit pattern of 2^31-1 pseudorandom binary sequence (PRBS31). Remarkably, the bit error rates (BER) decrease by 5 orders of magnitude under -10 dB OFB. These results indicate the ultra-robustness of 100 GHz grid QD comb laser, which exhibits great transmission enhancement under strong OFB of -10 dB.


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National Key Research and Development Program of China (2022YFB2803600); National Natural Science Foundation of China (62225407,62334013,12274449,62005308); Innovation Program for Quantum Science and Technology (2021ZD0302300); Youth Innovation Promotion Association of the Chinese Academy of Sciences (Y2022005,2023008); Basic and Applied Basic Research Foundation of Guangdong Province (2021A1515110076)

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