AI Article Synopsis
- - The text discusses a photodetector that combines two advanced technologies: a Fabry-Perot filtering cavity (FPC) and a taper absorption cavity (TAC), aiming to achieve high performance metrics in light detection.
- - The taper cavity enhances absorption and allows for improved speed, efficiency, and spectral control, while various design factors like taper angle and beam size were analyzed for better performance.
- - A fabricated device demonstrated impressive characteristics, including a narrow spectral linewidth of 0.6 nm, a tuning range of 10.2 nm, a bandwidth of 12 GHz, and a quantum efficiency around 70%, with a very thin absorption layer thickness of 0.3 micrometers.
Article Abstract
We demonstrate a wavelength-selective photodetector that combines a Fabry-Perot filtering cavity (FPC) with a taper absorption cavity (TAC). The taper cavity shows a nonresonant effect but exhibits an absorption enhancement effect, so that high speed, high quantum efficiency, wide tuning range, and an ultranarrow spectral linewidth can be achieved simultaneously. Device performance was theoretically investigated by including key factors such as taper angle, finite-size diffracting-beam input, and lateral walk-off in the taper cavity. The device was fabricated by bonding a GaAs-based FPC, which can be tuned via thermal-optic effect, with an InP-based TAC. An integrated device with a spectral linewidth of 0.6 nm (FWHM), a wavelength tuning range of 10.2 nm(1518.0-1528.2 nm), a 3 dB bandwidth of 12 GHz, and a quantum efficiency of approximately 70% was demonstrated, and the absorption layer thickness is only 0.3 microm.
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| http://dx.doi.org/10.1364/ao.45.008448 | DOI Listing |
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