Publications by authors named "Douwe Geuzebroek"

We demonstrate a flow cytometer in which structured light illumination is used to attribute fluorescent and scattering signals to their excitation wavelength. A suitable multi-color light source emitting structured illumination patterns at 405, 488, 561 and 640 nm is developed based on a silicon nitride photonic integrated circuit and cytometry experiments are conducted with calibration beads. Performance metrics of the novel cytometer are compared with those of a mature, commercial device.

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Article Synopsis
  • This paper presents a new InP-SiN dual laser module that shows impressive characteristics, including a low relative intensity noise (RIN) of -165 dB/Hz and a wide wavelength tunability of 100 nm.
  • The laser is used in a short-reach data center system with 28 GBd 8-level pulse amplitude modulation (PAM), and tests show it can maintain a low bit error ratio (BER) while effectively handling a broad wavelength range.
  • The study finds that this laser module outperforms a commercial external cavity laser (ECL) in performance and underscores the importance of RIN in creating advanced short-reach data transmission systems.
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We implement a multi-color laser engine with silicon nitride photonic integrated circuit technology, that combines four fluorophore excitation wavelengths (405 nm, 488 nm, 561 nm, 640 nm) and splits them with variable attenuation among two output fibers used for different microscope imaging modalities. With the help of photonic integrated circuit technology, the volume of the multi-color laser engine's optics is reduced by two orders of magnitude compared to its commercially available discrete optics counterpart. Light multiplexing is implemented by means of a directional coupler based device and variable optical attenuation as well as fiber switching with thermally actuated Mach-Zehnder interferometers.

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