Description of the IO assembly. Top: mechanical mount including the IO beam combiner and the fibre array. Bottom: photograph of an IO beam combiner manufactured by silica-on-silicon etching (left) and scheme of the beam combiner principle (right): 66/33 couplers (in red), Y-junctions (in grey), achromatic π/2-phase shifters (in light blue), and 50/50 couplers (in green). See text for details.
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