Abstract
High refractive index contrast waveguides with tight optical mode confinement are becoming indispensable in densely integrated high-resolution (R=∆/∆λ~60,000) micro-spectrographs (MSG) for astronomical and biomedical applications. While Silica-on-Si technology offers low propagation losses and SMF fiber compatibility, it requires rigorous design and fabrication techniques to realise MSGs with R>50000. We present first experimental results with alternative material technology (Silicon nitride-on-Silica) for Astrophotonics applications with useful optical properties such as high-nonlinear coefficient, absence of two-photon absorption, allowing integration of high-Q ring-resonator calibration sources on the same platform [1]. Several nano-wire devices such as Multi-Mode interference (MMI) photonic power splitters, MMI-Cross/Bar switches [2], Mach-Zehnder Interferometer (MZI), were designed using finite element method and BPM simulations (RSoft). The waveguide core was designed to be 600x750nm2 for single-mode operation in the entire C-band. Access waveguide separation was reduced to 15µm, in contrast to the standard 125-250µm, in order to permit high integration density of waveguides.
© 2013 IEEE
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