We demonstrate a small size and low weight packaged photodiode for space-based photonic RF applications. The photodiode offers a broadband 50 Ω matching, a 3 dB-bandwidth above 40 GHz and a linear response up to +10 dBm optical input power with a responsivity of 0.75 A/W.
We demonstrate the integration of short-pass and long-pass optical thin film filters targeting Passive Optical Network (PON) applications in a versatile high-speed InGaAs p-i-n photodiode device concept. The optical filters are deposited by RF sputtering into a protective recess on the photodiode bottom-side. This configuration allows to separate the two main functions of optical filtering and opto-electrical conversion. We obtained photodiodes with high optical isolation of 25 dB in the stop-band as well as high responsivity of 0.82 and 0.93 A/W in the pass-band for a short-pass and a longpass filter. We investigated the temperature induced wavelength shift of the filter transmission spectrum between 20 °C and 120 °C and found a conventional linear relationship with a low temperature dependence of only 20 and 83 pm/°C for the short-pass and the long-pass filter. Simulations of the long-pass filter transmission characteristics regarding light incidence angle show a wavelength shift of less than 7nm for angles below 10°. Above 10° a higher shift and polarization dependence appear. Through different thermal cyclings we also demonstrated the environmental stability of the integrated filters.
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