Strong Bragg gratings in nonsensitized low-loss planar waveguides as building blocks for WDM network components

Joerg Huebner; Jean-Marc Jouanns; Jens Engholm Pedersen; Rasmus Kromann; Thomas Feuchter; Martin Kristensen

doi:10.1117/12.264171

23 January 1997 Strong Bragg gratings in nonsensitized low-loss planar waveguides as building blocks for WDM network components

Joerg Huebner, Jean-Marc Jouanns, Jens Engholm Pedersen, Rasmus Kromann, Thomas Feuchter, Martin Kristensen

Author Affiliations +

Proceedings Volume 2998, Photosensitive Optical Materials and Devices; (1997) https://doi.org/10.1117/12.264171
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

The performance of WDM networks is highly dependent on the wavelength selective components within the network. When using Bragg gratings as wavelength selective elements they have to fulfill a number of criteria such as low loss, high reflectivity, nearly square filter function and high background rejection. Highly photosensitive germanium doped silica-on-silicon planar waveguides have been produced by plasma enhanced chemical vapor deposition (PECVD). Total insertion losses (including fiber to waveguide coupling losses) down to 1 dB for a 5.1 cm long waveguide have been measured at 1541 nm. A germanium content of 8.6 mol% in the core combined with the PECVD process insures high photosensitivity towards 193 nm. Twenty mm long Bragg gratings have been induced by illuminating the waveguides with 193 nm light through a phase mask. The induced gratings show up to 99.98 percent reflectivity and a background rejection better than 22 dB at plus or minus 1 nm from the Bragg wavelength. No hydrogen loading or any other kind of sensitization was necessary to produce these gratings. The spectral flatness (3 dB reflection bandwidth: 0.55 nm and 1 dB reflection bandwidth: 0.47 nm) around the Bragg wavelength and the high background rejection make these gratings well suited building blocks for multi-wavelength network components.

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Joerg Huebner, Jean-Marc Jouanns, Jens Engholm Pedersen, Rasmus Kromann, Thomas Feuchter, and Martin Kristensen "Strong Bragg gratings in nonsensitized low-loss planar waveguides as building blocks for WDM network components", Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997); https://doi.org/10.1117/12.264171

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