A device for measuring an optical absorption property of a fluid as a function of wavelength, the device comprising: - an integrated photonics substrate; - a broadband light source for emitting light having a spectral distribution that has a full width at half maximum of at least 50 nm; - a plurality of integrated optical waveguides, in or on said integrated photonics substrate, for guiding said light; - a light coupler for coupling said light emitted by the broadband light source into the plurality of integrated optical waveguides such that the light coupled into each of the integrated optical waveguides has substantially the same spectral distribution; - a microfluidic channel for containing said fluid, said microfluidic channel being arranged such as to allow an interaction of the light propagating through each of the integrated optical waveguides with said fluid when contained in the microfluidic channel; and - a plurality of spectral analysis devices, each spectral analysis device being optically coupled to a corresponding integrated optical waveguide such as to, in operation, receive said light after said interaction of said light with the fluid, and wherein each spectral analysis device is adapted for generating a signal representative of a plurality of predetermined spectral components of said light, characterized in that said light coupler comprises: - a collimator for collimating the light emitted by the broadband light source into a collimated radiation beam, and - a beam shaper for distributing the power of the collimated light over a discrete number of line shaped light fields, said beam shaper being arranged such that each line shaped light field is projected onto a light entry surface of a corresponding waveguide of the plurality of integrated optical waveguides. - an integrated photonics substrate; - a broadband light source for emitting light having a spectral distribution that has a full width at half maximum of at least 50 nm; - a plurality of integrated optical waveguides, in or on said integrated photonics substrate, for guiding said light; - a light coupler for coupling said light emitted by the broadband light source into the plurality of integrated optical waveguides such that the light coupled into each of the integrated optical waveguides has substantially the same spectral distribution; - a microfluidic channel for containing said fluid, said microfluidic channel being arranged such as to allow an interaction of the light propagating through each of the integrated optical waveguides with said fluid when contained in the microfluidic channel; and - a plurality of spectral analysis devices, each spectral analysis device being optically coupled to a corresponding integrated optical waveguide such as to, in operation, receive said light after said interaction of said light with the fluid, and wherein each spectral analysis device is adapted for generating a signal representative of a plurality of predetermined spectral components of said light, characterized in that said light coupler comprises: - a collimator for collimating the light emitted by the broadband light source into a collimated radiation beam, and - a beam shaper for distributing the power of the collimated light over a discrete number of line shaped light fields, said beam shaper being arranged such that each line shaped light field is projected onto a light entry surface of a corresponding waveguide of the plurality of integrated optical waveguides. - a plurality of integrated optical waveguides, in or on said integrated photonics substrate, for guiding said light; - a light coupler for coupling said light emitted by the broadband light source into the plurality of integrated optical waveguides such that the light coupled into each of the integrated optical waveguides has substantially the same spectral distribution; - a microfluidic channel for containing said fluid, said microfluidic channel being arranged such as to allow an interaction of the light propagating through each of the integrated optical waveguides with said fluid when contained in the microfluidic channel; and - a plurality of spectral analysis devices, each spectral analysis device being optically coupled to a corresponding integrated optical waveguide such as to, in operation, receive said light after said interaction of said light with the fluid, and wherein each spectral analysis device is adapted for generating a signal representative of a plurality of predetermined spectral components of said light, characterized in that said light coupler comprises: - a collimator for collimating the light emitted by the broadband light source into a collimated radiation beam, and - a beam shaper for distributing the power of the collimated light over a discrete number of line shaped light fields, said beam shaper being arranged such that each line shaped light field is projected onto a light entry surface of a corresponding waveguide of the plurality of integrated optical waveguides.