Modeling of graded index waveguide fabricated by ion exchange on Er3+ doped glass |
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Authors: | Shao Gong-Wang and Jin Guo-Liang |
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Institution: | Department of Physics, Shanghai Jiao Tong University,
Shanghai 200240, China |
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Abstract: | A general numerical tool, based on thermal diffusion equation and
full-vectorial eigen-mode equation, has been presented for the
systematic analysis of graded index channel waveguide fabricated by
ion exchange on Er3+ doped glass. Finite difference method
with full-vectorial formulation (FV-FDM) is applied to solving the
full-vectorial modes of graded index channel waveguide for the first
time. The coupled difference equations based on magnetic fields in
FV-FDM are derived from the Taylor series expansion and accurate
formulation of boundary conditions. Hybrid nature of vectorial
guided modes for both pump (980 nm) and signal light (1550 nm) are
demonstrated by the simulation. Results show that the fabrication
parameters of ion exchange, such as channel opening width and time
ratio of second step to first step in ion exchange, have large
influence on the properties of waveguide. By optimizing the
fabrication parameters, maintenance of monomode for signal light and
improvement of the gain dynamics can be achieved in Er3+
doped waveguide amplifier (EDWA) fabricated by ion exchange
technique. This theoretical model is significant for the design and
fabrication of EDWA with ion exchange technique. Furthermore, a
single polarization EDWA, which operates at wavelength from 1528 nm
to 1541 nm for HE polarization, is numerically designed. |
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Keywords: | graded index channel waveguide finite difference method full-vectorial mode ion exchange
technique |
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