Integrated photonic building blocks for next-generation astronomical instrumentation I: the multimode waveguide

  title={Integrated photonic building blocks for next-generation astronomical instrumentation I: the multimode waveguide},
  author={Nemanja Jovanovic and Izabela Spaleniak and Simon Gross and Michael J. Ireland and Jonathan S. Lawrence and Christopher Miese and Alexander Fuerbach and Michael J. Withford},
  journal={Optics Express},
We report on the fabrication and characterization of composite multimode waveguide structures that consist of a stack of single-mode waveguides fabricated by ultrafast laser inscription. We explore 2 types of composite structures; those that consist of overlapping single-mode waveguides which offer the maximum effective index contrast and non-overlapped structures which support multiple modes via strong evanescent coupling. We demonstrate that both types of waveguides have negligible… Expand
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