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On-chip free beam optics on a polymer-based photonic integration platform

: Happach, M.; Felipe, D. de; Conradi, H.; Friedhoff, V.N.; Schwartz, E.; Kleinert, M.; Brinker, W.; Zawadzki, C.; Keil, N.; Hofmann, W.; Schell, M.

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Optics Express 25 (2017), No.22, pp.27665-27670
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer HHI ()

This paper presents on-chip free beam optics on polymer-based photonic components. Due to the circumstance that waveguide-based optics allows no direct beam access we use Gradient index (GRIN) lenses assembled into the chip to collimate the beam from the waveguides. This enables low loss power transmission over a length of 1432 mu m. Even though the beam propagates through air it is possible to create a resonator with a wavelength shift of 0.002 nm/degrees C, hence the allowed deviations from the ITU-T grid (100 GHz) are met for +/- 20 degrees C. In order to guarantee reliable laser stability, it is necessary to implement optical isolators at the output of the laser. This requires the insertion of bulk material into the chip and is realized by a 1050 mu m thick coated glass. Due to the large gap of the free-space section, it is possible to combine different resonators together. This demonstrates the feasibility of an integrated wavelength-meter.