At the Department of Optoelectronics at SUT for more
than ten years investigations have been under way concerning
magnetooptically sensitive waveguides [9–19]. For two
years already investigations have been run concerning socalled
volumetric optoelectronic sensors of the magnetic field
with optical fibre inputs [16]. Sensors of this kind are classi-
fied as so-called waveguide sensors with external transformation
[15,20].