Sensors, Vol. 20, Pages 6089: Design of a Multipurpose Photonic Chip Architecture for THz Dual-Comb Spectrometers

Sensors, Vol. 20, Pages 6089: Design of a Multipurpose Photonic Chip Architecture for THz Dual-Comb Spectrometers Sensors doi: 10.3390/s20216089 Authors: Andrés Betancur-Pérez Pedro Martín-Mateos Cristina de Dios Pablo Acedo In this work, we present a multipurpose photonic integrated circuit capable of generating multiheterodyne complex Dual-Combs (DC) THz signals. Our work focuses on translating the functionality of an electro-optic tunable DC system into a photonic chip employing standard building blocks to ensure the scalability and cost efficiency of the integrated device. The architecture we analyze for integration is based on three stages: a seed comb, a mode selection stage and a DC stage. This final DC stage includes a frequency shifter, a key element to improve the final detection of the THz signals and obtain real-time operation. This investigation covers three key aspects: (1) a solution for comb line selection on GHz spaced combs using OIL or OPLL on photonic chips is studied and evaluated, (2) a simple and versatile scheme to produce a frequency shift using the double sideband suppressed carrier modulation technique and an asymmetric Mach Zehnder Interferometer to filter one of the sidebands is proposed, and (3) a multipurpose architecture that can offer a versatile effective device, moving from application-specific PICs to general-purpose PICs. Using the building blocks (BBs) available from an InP-based foundry, we obtained simulations that offe...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
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