Reconfigurable photonic fractional Fourier transformer

Shaowen Peng; Shangyuan Li; Guanyu Han; Xiaoxiao Xue; Xiaoping Zheng

doi:10.1117/12.2605312

1 November 2021 Reconfigurable photonic fractional Fourier transformer

Shaowen Peng, Shangyuan Li, Guanyu Han, Xiaoxiao Xue, Xiaoping Zheng

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120571N (2021) https://doi.org/10.1117/12.2605312
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

We propose and demonstrate a reconfigurable photonic fractional Fourier transformer (PFrFTer). A linear chirp light serves as the fractional Fourier transform (FrFT) kernel to rotate the time-frequency plane, forming an optical fractional Fourier domain (FrFD). The input signal is projected on the FrFD, and the FrFT of the signal is obtained. The order of the PFrFTer is reconfigurable and can be adjusted by changing the chirp rate of the light. In the experiment, we obtain the FrFT results of a typical linear frequency modulated wave (LFMW) with a bandwidth of 12 GHz at different orders based on the PFrFTer. By comparing these results with the digital FrFT calculation, it is found that the mean square error between them is less than 4×10^-4, which confirms the effectiveness of the PFrFTer. Besides, we demonstrate a practical application of the reconfigurable PFrFTer: the absolute measurement of the chirp rate of an LFMW.

Citation Download Citation

Shaowen Peng, Shangyuan Li, Guanyu Han, Xiaoxiao Xue, and Xiaoping Zheng "Reconfigurable photonic fractional Fourier transformer", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120571N (1 November 2021); https://doi.org/10.1117/12.2605312

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KEYWORDS

Signal processing

Modulation

Fourier transforms

Transformers

Light sources

Optoelectronics

Single sideband modulation

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