Integrated optical circuit and method for measuring current as well as sensor module and measuring device

摘要

In an integrated optical circuit, light from a light source is polarized and coupled to a first and second strip waveguide. A waveguide coupling element couples the two optical signals from the two strip waveguides to different polarization modes of an optical fiber line. The optical fiber line is connected to a measuring head, which reflects the optical signal and in which a phase difference between the two optical partial signals is modulated in a magnetic field. In the waveguide coupling element, the reflected signal is split into two optical partial signals having the same polarization and the phase difference between the two partial signals is determined. A phase modulator device provides for closed-loop operation. Compared to fiber-optical concepts, the number of splices is reduced.

主权项

1. An integrated optical circuit for measuring current on the basis of the Faraday effect, comprising at least one optical module, which encompasses:
a first strip waveguide of a semiconductor material; a second strip waveguide of the semiconductor material; a waveguide coupling element, which is suitable for coupling a first optical signal from the first strip waveguide and a second optical signal from the second strip waveguide to an optical fiber line, wherein the same polarization modes of the first and second optical signal are coupled to different polarization modes of the optical fiber line and optical signals from the optical fiber line are coupled to first and second strip waveguide as a function of the polarization mode; a directional coupling element, which is suitable to couple an optical input signal at an input gate to the first and the second strip waveguide and to couple optical signals from the first and second strip waveguide to an output gate; a first optical signal path between the directional coupling element and the waveguide coupling element, comprising the first strip waveguide; and a second optical signal path between the directional coupling element and the waveguide coupling element, comprising the second strip waveguide, wherein an optical distance of the second optical signal path deviates from that of the first optical signal path, so that an interference contrast of the optical signals in the waveguide coupling element as compared to the identical distance is reduced by at least 50%.