GeS2-Ga2S3-CsI chalcohalide glasses for all-optical switching devices

D. Marchese, M. De Sario, A. Jha, A. K. Kar, E. G. Smith

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


High-speed all-optical signal routing is achievable by designing new materials with fast response optical nonlinearities (~1ps); in this context, third-order high nonlinear refractive index glasses are the best candidates. In this work, the characterisation of the third-order nonlinear optical properties of a new chalcohalide glass and its application for the fabrication of high-efficiency nonlinear optical devices are presented. We report the measured values of high third-order optical nonlinear refractive index n2 and the two-photon absorption (TPA) ß (n2=3.10×10-5cm2GW-1; ß=1.45cmGW-1) of a new ternary GeS2-Ga2-CsI chalcohalide glass. Improvements in the glass third-order optical nonlinearity were achieved by the inclusion of Ag-ions in the ternary glass composition. A theoretical analysis of signal propagation along a nonlinear directional coupler (NLDC) in twin-core fibre geometry and the interaction between the signal electromagnetic (e.m.) field and the waveguiding medium were considered in order to estimate the performance of the considered device for all-optical switching applications. All-optical switching, by controlling the optical pulse intensity in NLDC, has been numerically modelled in the second telecommunication window (?=1.31 µm), and preliminary results support the suitability of this glass for these applications.

Original languageEnglish
Pages (from-to)177-185
Number of pages9
JournalProceedings of SPIE - the International Society for Optical Engineering
Publication statusPublished - 1998
EventInfrared glass optical fibers and their applications - Quebec,Que.
Duration: 14 Jul 199816 Jul 1998


  • All-optical Switch
  • Beam Propagation Method
  • Chalcohalide Glasses
  • Directional Coupler
  • Optical Nonlinearity
  • Telecommunication routing


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