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    • 8. 发明公开
    • METHOD AND DEVICE FOR DETECTING ABSOLUTE OR RELATIVE TEMPERATURE AND/OR ABSOLUTE OR RELATIVE WAVELENGTH
    • EP4220108A1
    • 2023-08-02
    • EP23176852.4
    • 2020-12-09
    • ADVA Optical Networking SE
    • Wohlfeil, BenjaminMehrpoor, Gilda
    • G01K11/00G02B6/293H01S5/0687H01S5/068H01S5/0683
    • The invention relates to a method for detecting the absolute temperature or temperature changes and/or the absolute wavelength or wavelength changes of an optical probe signal using an optical detection device (100; 200; 300) comprising an optical waveguide structure (102; 202; 302) defining an optical input port (102a; 202a; 302a) adapted to receive the optical probe signal (S probe ) and a first and a second optical output port (102b, 102c; 202b, 202c; 302b, 302c) adapted to output a first and a second optical detection signal (S d1,opt , S d2,opt ), respectively, as a response to the optical probe signal (S probe ), the optical waveguide structure (102; 202; 302) being configured in such a way that a first power transfer function F 1 (λ,T) characterizing the transmission of the optical probe signal (S probe ) from the optical input port (102a; 202a; 302a) to the first optical output port differs (102b; 202b; 302b), with respect to its wavelength and temperature dependency, from a second power transfer function F 2 (λ,T) characterizing the transmission of the optical probe signal (S probe ) from the optical input port (102a; 202a; 302a) to the second optical output port (102c; 202c; 302c). The method comprises the steps of transmitting the optical probe signal (S probe ) having a predetermined - not necessarily constant - wavelength to the optical input port (102a; 202a; 302a); detecting the first and second optical detection signal (S d1,opt , S d2,opt ) at the first and second optical output port (102b, 102c; 202b, 202c; 302b, 302c) by means of a first a and second opto-electrical converter (106, 108) which create a first and second electrical signal (S d1,el , S d2,el ) corresponding to the optical power of the respective first or second optical detection signal (S d1,opt , S d2,opt ); measuring values of the first and second electrical signal (S d1,el , S d2,el ) and determining an absolute temperature value or a value of a temperature change of the optical waveguide structure (S d1,el , S d2,el ) and/or an absolute wavelength value or a value of a wavelength change of the optical probe signal (S probe ) by using the values measured of the first and second electrical signal (S d1,el , S d2,el ) and a first and a second previously determined wavelength and temperature dependency of both the first and second power transfer function (F 1 (λ,T), F 2 (λ,T)). The invention further relates to an optical detection device (100; 200; 300) for implementing this method.