InAs/InP(100) QD waveguide photodetectors for a monolithically integrated optical coherence tomography system around 1.7 μm

InAs/InP(100) quantum dot (QD) waveguide photodetectors are presented in this paper. The devices are fabricated using the layer stack of semiconductor optical amplifiers (SOAs) and are compatible with the active-passive integration technology. The characterization and simulation on the devices have shown good potential to be used in a monolithically integrated swept-source optical coherence tomography (SS-OCT) system in 1.6 to 1.8 µm wavelength range

Integrated tunable optical filters on InP for continuously tunable lasers

We have realized a set of electro-optically controlled tunable arrayed waveguide gratings and present wavelength dependent calibration results for its tuning. These filters are designed to be used in a monolithically integrated tunable laser

An InAs/InP(100) QD Waveguide Photodetector for OCT application

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Design, fabrication and characterization of an InP-based tunable integrated optical pulse shaper

A tunable integrated semiconductor optical pulse shaper is presented. The device consists of a pair of 200 GHz arrayed waveguide gratings with an array of electrooptical phase modulators in between. It has been fabricated in InP/InGaAsP material for operation at wavelengths around 1.55 µm, and has an optical bandwidth of 36 nm. Multimode inputs to the waveguide gratings are used to flatten their optical passbands, leading to a fourfold decrease in pulse ringing. The device is able to (pre-) compensate dispersion values of 0.2 ps/nm for 300 fs pulses, which is a suitable value for applications in e.g. biomedical multi-photon imaging

Integrated tunable quantum dot laser for optical coherence tomography in the 1.7μm wavelength region

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jYCaMP: an optimized calcium indicator for two-photon imaging at fiber laser wavelengths

Femtosecond lasers at fixed wavelengths above 1,000 nm are powerful, stable and inexpensive, making them promising sources for two-photon microscopy. Biosensors optimized for these wavelengths are needed for both next-generation microscopes and affordable turn-key systems. Here we report jYCaMP1, a yellow variant of the calcium indicator jGCaMP7 that outperforms its parent in mice and flies at excitation wavelengths above 1,000 nm and enables improved two-color calcium imaging with red fluorescent protein-based indicators