Integrated optic single-ring filter for narrowband phase demodulation

C. K. Madsen

doi:10.1117/12.2262715

8 May 2017 Integrated optic single-ring filter for narrowband phase demodulation

C. K. Madsen

Proceedings Volume 10194, Micro- and Nanotechnology Sensors, Systems, and Applications IX; 101942W (2017) https://doi.org/10.1117/12.2262715
Event: SPIE Defense + Security, 2017, Anaheim, CA, United States

Abstract

Integrated optic notch filters are key building blocks for higher-order spectral filter responses and have been demonstrated in many technology platforms from dielectrics (such as Si₃N₄) to semiconductors (Si photonics). Photonic-assisted RF processing applications for notch filters include identifying and filtering out high-amplitude, narrowband signals that may be interfering with the desired signal, including undesired frequencies detected in radar and free-space optical links. The fundamental tradeoffs for bandwidth and rejection depth as a function of the roundtrip loss and coupling coefficient are investigated along with the resulting spectral phase response for minimum-phase and maximum-phase responses compared to the critical coupling condition and integration within a Mach Zehnder interferometer. Based on a full width at half maximum criterion, it is shown that maximum-phase responses offer the smallest bandwidths for a given roundtrip loss. Then, a new role for passive notch filters in combination with high-speed electro-optic phase modulation is explored around narrowband phase-to-amplitude demodulation using a single ring operating on one sideband. Applications may include microwave processing and instantaneous frequency measurement (IFM) for radar, space and defense applications.

Citation Download Citation

C. K. Madsen "Integrated optic single-ring filter for narrowband phase demodulation", Proc. SPIE 10194, Micro- and Nanotechnology Sensors, Systems, and Applications IX, 101942W (8 May 2017); https://doi.org/10.1117/12.2262715

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