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Multi-wavelength 128 Gbit s−1 λ−1 PAM4 optical transmission enabled by a 100 GHz quantum dot mode-locked optical frequency comb

Pan, Shujie, Zhang, Hongguang, Liu, Zizhuo, Liao, Mengya, Tang, Mingchu, Wu, Dingyi, Hu, Xiao, Yan, Jie, Wang, Lei, Guo, Mingchen, Wang, Zihao, Wang, Ting, Smowton, Peter M. ORCID:, Seeds, Alwyn, Liu, Huiyun, Xiao, Xi and Chen, Siming 2022. Multi-wavelength 128 Gbit s−1 λ−1 PAM4 optical transmission enabled by a 100 GHz quantum dot mode-locked optical frequency comb. Journal of Physics D: Applied Physics 55 (14) , 144001. 10.1088/1361-6463/ac4365

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Semiconductor mode-locked lasers (MLLs) with extremely high repetition rates are promising optical frequency comb (OFC) sources for their usage as compact, high-efficiency, and low-cost light sources in high-speed dense wavelength-division multiplexing transmissions. The fully exploited conventional C- and L- bands require the research on O-band to fulfil the transmission capacity of the current photonic networks. In this work, we present a passive two-section InAs/InGaAs quantum-dot (QD) MLL-based OFC with a fundamental repetition rate of ∼100 GHz operating at O-band wavelength range. The specially designed device favours the generation of nearly Fourier-transform-limited pulses in the entire test range by only pumping the gain section while with the absorber unbiased. The typical integrated relative intensity noise of the whole spectrum and a single tone are −152 and −137 dB Hz−1 in the range of 100 MHz–10 GHz, respectively. Back-to-back data transmissions for seven selected tones have been realised by employing a 64 Gbaud four-level pulse amplitude modulation format. The demonstrated performance shows the feasibility of the InAs QD MLLs as a simple structure, easy operation, and low power consumption OFC sources for high-speed fibre-optic communications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: IOP Publishing
ISSN: 0022-3727
Date of First Compliant Deposit: 14 March 2022
Date of Acceptance: 15 December 2021
Last Modified: 23 May 2023 15:20

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