Photonic component with an interference device having at least one input and at least one first and one second output, wherein the component (10 furthermore comprises: - a first grating coupler, which has a first and a second grating coupler output and is connected, by way of a grating coupler input, to the first output of the interference device, - a second grating coupler, which has a first and a second grating coupler output and is connected, by way of a grating coupler input, to the second output of the interference device, - a first photodetector, which is connected to the first grating coupler output of the first grating coupler, - a second photodetector, which is connected to the first grating coupler output of the second grating coupler, and - a control device, which is connected to the first and second photodetectors (PD1, PD2) and, on the basis of the photo signals (I1, 12) of the two photodetectors (PD1, PD2) or an evaluation signal formed with the photo signals (I1, I2), forms at least one control signal (ST1, ST2) for controlling the interference device, - wherein the first and second grating couplers (GC1, GC2) are arranged, in particular integrated, in the same chip plane of a chip of the component, and - wherein, in the case of the first and second grating couplers (GC1, GC2), in each case the second grating coupler outputs form in each case a coupling path out of the chip plane, specifically at an angle of between 70 and 110 degrees with respect to the chip plane, characterized in that - at least one of the photodetectors (PD1, PD2) or both photodetectors (PD1, PD2) is/are arranged outside the chip plane of the chip and - a further coupler (GC3, GC4) is arranged between the photodetector (PD1, PD2) arranged outside the chip plane of the chip and the grating coupler (GC1, GC2) connected to said photodetector, in particular a further coupler which is arranged in the chip plane and whose coupler output forms a coupling path out of the chip plane, specifically at an angle of between 70 and 110 degrees with respect to the chip plane. - a first grating coupler, which has a first and a second grating coupler output and is connected, by way of a grating coupler input, to the first output of the interference device, - a second grating coupler, which has a first and a second grating coupler output and is connected, by way of a grating coupler input, to the second output of the interference device, - a first photodetector, which is connected to the first grating coupler output of the first grating coupler, - a second photodetector, which is connected to the first grating coupler output of the second grating coupler, and - a control device, which is connected to the first and second photodetectors (PD1, PD2) and, on the basis of the photo signals (I1, 12) of the two photodetectors (PD1, PD2) or an evaluation signal formed with the photo signals (I1, I2), forms at least one control signal (ST1, ST2) for controlling the interference device, - wherein the first and second grating couplers (GC1, GC2) are arranged, in particular integrated, in the same chip plane of a chip of the component, and - wherein, in the case of the first and second grating couplers (GC1, GC2), in each case the second grating coupler outputs form in each case a coupling path out of the chip plane, specifically at an angle of between 70 and 110 degrees with respect to the chip plane, characterized in that - at least one of the photodetectors (PD1, PD2) or both photodetectors (PD1, PD2) is/are arranged outside the chip plane of the chip and - a further coupler (GC3, GC4) is arranged between the photodetector (PD1, PD2) arranged outside the chip plane of the chip and the grating coupler (GC1, GC2) connected to said photodetector, in particular a further coupler which is arranged in the chip plane and whose coupler output forms a coupling path out of the chip plane, specifically at an angle of between 70 and 110 degrees with respect to the chip plane.