 |
|
In collaboration with Proximion
|
Design and fabrication of advanced fibre Bragg gratings
The principle of our fabrication technique is to constructively superpose interference fringes from an UV laser along a fiber (sometimes called multiple printing in fibers). The superposition is controlled by interferometrically measuring the translation of the irradiated fiber. With a pulsed laser, the laser is triggered every time the appropriate position is reached.
From very short interference fringes pattern, 100 to 250 micrometers, we are able to fabricate up to 30 cm long gratings. With this technique, it is extremely easy to vary the amplitude of index modulation in the fiber and to introduce phase shifts. At the same time, the mean index change can be kept constant along the grating. Our grating writing facility allows for the fabrication of long and complex-structured FBGs. Almost any phase and index profiles are possible to realize.