An arrangement for coupling a light waveguide, such as a monomode glass fiber to a laser diode and a method of forming the coupling characterized by the laser diode being an integrated part of a semi-conductor chip having a mirrored step projecting out of a seating surface for the monomode glass fiber. The mirrored step defines an end face of the diode from which the laser beam emerges and the seating surface extends parallel to the laser active layer of the diode and at such an interval from the layer that the light entry face of the one end of the waveguide laying flat on the seating surface lies at the same height as the exit point of the beam. The method includes securing the fiber forming the waveguide on the seating surface, and then applying an external magnetic field to the diode to displace and pivot the beam in the laser active layer to adjust the beam relative to the fiber.
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