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Infrared Physics & Technology

Improvement of the process of soliton self-frequency shift assisted by tapered fiber oriented to optical quantization technology

Bowen Chen, Silun Du, Deqi Li, Baoqun Li, Tianjiao Wu, Haiyang Qin, Dai Chen, Tianshu Wang

Published Nov 28, 2024• 1 citation
Publisher
DOI
10.1016/j.infrared.2024.105644

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Semiconductor Lasers and Applications•Nov 6, 2018•1 citation
We demonstrate a high-resolution quantization scheme based on soliton self-frequency shift (SSFS) and spectral compression in a bi-directional comb-fiber architecture. Our scheme is composed of a Sagnac-loop-based mirror and a comblike combination of two sections of interleaved single-mode fibers (SMFs) and high nonlinear fibers (HNLFs). The Sagnac-loop-based mirror is placed at the terminal of the bus line to reflect the optical pulses back to the bus line to achieve single-stage SSFS and three-stage spectral compression. Quantization with a resolution of 6.2-bit is obtained in the experiment, which is 1.2-bit higher than that of its uni-directional counterpart. Our bidirectional scheme can achieve higher quantization resolution with a small volume and a low cost compared with its uni-directional counterpart.
A novel optical spectrum compression scheme based on time-dependent filtering is proposed and demonstrated. The spectrum compression is realized by using nonlinear polarization rotation effect to achieve power-dependent filtering of a chirped soliton pulse. In the experiment, a single-stage spectrum compression unit based on the proposed scheme is employed in the soliton self-frequency shift-based optical quantization system to improve the quantization resolution. The experimental results show that an average output spectrum width of 1.5 nm is obtained using the proposed scheme, which is 68% of that using the traditional comb-like fiber scheme. In addition, the quantization resolution using the proposed scheme is 5.1 bits, which is 0.6 bit higher than that using a single-stage spectrum compression unit based on the traditional comb-like fiber structure.