Integrated chip

An integrated chip for data communication, telecommunication and optical analysis for at least one, two or more wavelengths where the chip can be used not only to emit light but also to detect light, characterised in that the chip (1) comprises a waveguide (2) with a first port (3), in that the waveguide (2) expands from the first port (3) in the direction of at least one second waveguide (4) and one third w waveguide (6) with at least one second port (5) and one third port (7), respectively, these being placed parallel to each other or at an angle to each other, and separated by a certain distance, characterised in that the chip has a basic structure which is equal from a carrier (22) and upwards over the whole of the surface of the chip, in that said wave guide is formed at the upper surface of the chip by means of that the basic structure has been etched down so that upwardly extending wave guides have been formed and in that the various said components of the chip (1) are monolithically integrated.