Chinese Optics Letters, Volume. 23, Issue 4, 041301(2025)

Experimental demonstration of a performance-enhanced optical quantizer based on adjoint shape optimization

Yijun He... Jifang Qiu*, Bowen Zhang, Qiuyan Li, Suping Jiao, Yan Li and Jian Wu |Show fewer author(s)
Author Affiliations
  • School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
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    Figures & Tables(6)
    (a) Schematic diagram of the sampling and quantization process based on our proposed phase-shifted optical quantizer. (b) The initial and (c) optimized structures of MMI. The y-coordinates of the green points on the boundary are parameters for shape optimization. (d) Quantization curves and (e) quantization codes of the ideal optical quantizer. (f) FOM/Target convergence curve. The inset is the boundary curve of the optimized MMI.
    Initial electric field profiles at 1550 nm for (a) one input light and (b) two input lights. The optimized electric field profiles at 1550 nm for (c) one input light and (d) two input lights.
    (a) Simulated transmittance curves of the 5 output ports at 1550 nm. (b) IL, (c) uniformity, and (d) ENOB of the initial and optimized optical quantizers.
    (a) IL, (b) uniformity, and (c) ENOB of the optimized optical quantizer for various values of width (ΔW = −40, 0, and 40 nm). The changes in width cause small shifts of the center wavelength.
    Microscopic images of the fabricated devices. (a) The system structures of the optical quantizers with (b) the initial and (c) the optimized MMIs.
    (a) Measured transmittance curves of the initial and optimized optical quantizers at 1550 nm. Transfer functions and ideal values for (b) the initial and (c) the optimized optical quantizers at 1550 nm. (d) IL, (e) uniformity, and (f) ENOB of the initial and optimized optical quantizers.
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    Yijun He, Jifang Qiu, Bowen Zhang, Qiuyan Li, Suping Jiao, Yan Li, Jian Wu, "Experimental demonstration of a performance-enhanced optical quantizer based on adjoint shape optimization," Chin. Opt. Lett. 23, 041301 (2025)

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    Paper Information

    Category: Integrated Optics

    Received: Aug. 25, 2024

    Accepted: Oct. 25, 2024

    Posted: Oct. 25, 2024

    Published Online: Apr. 24, 2025

    The Author Email: Jifang Qiu (jifangqiu@bupt.edu.cn)

    DOI:10.3788/COL202523.041301

    CSTR:32184.14.COL202523.041301

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