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We present a novel method to fabricate low bend loss femtosecond-laserwritten waveguides that exploits the differential thermal stabilities of laserinduced refractive index modifications. The technique consists of a two-stepprocess; the first involves fabricating large multimode waveguides, while thesecond step consists of a thermal post-annealing process, which erases theouter ring of the refractive index profile, enabling single mode operation inthe C-band. By using this procedure we report waveguides with sharp bends (downto 16.6 mm radius) and high (80%) normalized throughputs. This procedure wasused to fabricate an efficient 3D, photonic device known as a pupil-remapperwith negligible bend losses for the first time. The process will also allow forcomplex chips, based on 10's - 100's of waveguides to be realized in a compactfoot print with short fabrication times.

Low bend loss waveguides enable compact, efficient 3D photonic chips