Polarization rotator

Mikko Harjanne (Inventor), Timo Aalto (Inventor), Matteo Cherchi (Inventor)

    Research output: PatentPatent


    The invention concerns a polarization rotator. The inventive polarization rotator comprises an optical coupler (20) comprising a waveguide (27) having at one first end at least a first port configured as an input port (21) for polarized light and a second port configured as an output port (22) for reflected polarized light, said waveguide having a second end opposite to said first end. It further comprises a birefringent waveplate (24) having on one side a reflective surface (26), which waveplate is arranged to receive light from said second end of said waveguide and to reflect light transmitted out from said coupler back into said coupler (20). According to the invention, the waveplate is further configured to cause said birefringent material to rotate the polarization of said reflected light, which amount of rotation depends on an angle of rotation (R) of said birefringent waveplate (34) with respect to said optical coupler (20).

    Patent family as of 11.7.2022:

    CN114207488 A20220318CN20208004813620200430 EP3963378 A120220309EP2020072688020200430 FI129636 B20220615FI2019000536220190503 FI20195362 A20201104FI2019000536220190503 US2022214500 AA20220707US2021060818820200430 WO20225479 A120201112WO2020FI5029020200430

    Link to currentpatent family on right 

    Original languageEnglish
    Patent numberFI20195362
    IPCG02F 1/ 01 A I
    Priority date3/05/19
    Publication statusPublished - 4 Nov 2020
    MoE publication typeH1 Granted patent


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