VARIABLE OPTICAL ATTENUATOR AND OPTICAL SWITCH

WIPO Patent Application WO/2023/181482

A1

In order to increase a response speed when changing the amount of light to be output, this variable optical attenuator is provided with a spatial phase modulation element, a first light transmission unit, a second light transmission unit, and a control unit. The spatial phase modulation element has a plurality of lattice elements each having a base and a light reflection surface, and generates diffracted light by subjecting light emitted onto the light reflection surface of each of the lattice elements to phase modulation according to the displacement and pitch of a displacement pattern with respect to the bases of the lattice elements. The first light transmission unit transmits first light, and emits the first light toward the light reflection surfaces of the lattice elements. The second light transmission unit receives second light that is diffracted light different from zero order diffracted light generated by the phase modulation of the first light by the spatial phase modulation element, and transmits the second light. The control unit controls the displacement of the lattice elements with respect to the bases, to thereby increase/decrease the amount of the second light which enters the second light transmission unit from the spatial phase modulation element.

ASHIDA YUKI (JP)

PCT/JP2022/040428

September 28, 2023

October 28, 2022

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SCREEN HOLDINGS CO LTD (JP)

G02B26/02; B81B3/00; G02B6/35

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JP2019132905A	2019-08-08
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YOSHITAKE Hidetoshi et al. (JP)

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