Byungchae Kim

Submicron Etched Beam Splitters Based on Total Internal Reflection in GaAs–AlGaAs Waveguides

Submicron etched beam splitters are designed, fabricated and characterized in Al0.9Ga0.1As-GaAs waveguides. Beam splitter transmission and reflection characteristics show clear dependence on gap dimension and angle of incidence. It is possible to obtain 8 to 30% power transmission by adjusting the gap dimension and angle of incidence. The experimental results agree well with three-dimensional (3-D) finite difference time domain (FDTD) simulations. The effect of imperfections, mainly the slope of etched sidewalls and variations in etch depth are investigated using 3-D FDTD. Design guidelines for low loss etched beam splitters are also given.

InP/InGaAsP Flattened Ring Lasers With Low-Loss Etched Beam Splitters

Compact flattened InP/InGaAsP multiquantum-well (MQW) resonators based on etched beam splitters (EBS) with 300- to 800-nm gaps and circumferences of 30-300 μm are demonstrated. Comparison of the EBS coupler reflection and transmission to 3-D finite-difference time-domain (FDTD) simulations shows good agreement in the wider EBS gap devices. Lasing is observed in 90-, 150-, and 300-μm length rings at threshold currents of 15, 14, and 29 mA, respectively.

Compact ring resonators using conventional waveguides, etched beam splitters and total internal reflection mirrors

Compact single ring resonator bandstop filters with 11.5 nm free spectral range and 12 dB extinction ratio are demonstrated in GaAs/AlGaAs using weakly guided waveguides, etched beam splitters and total internal reflection mirrors.

Compact Add/Drop Filters Using Etched Beam Splitter and Total Internal Reflection Mirrors

We present compact optical add-drop filters based on etched beam splitters and total internal reflection mirrors in weakly guiding GaAs/Al0.9Ga0.1As waveguides. Resonator with circumference of 70 μm have 11.5 nm FSR and 4.2 dB ER.

Compact Micro Resonators with Etched Beam Splitters and Total Internal Reflection Mirrors

We propose etched beam splitters as input/output couplers for micro-resonators and analyze feasibility of this idea using numerical simulation. We investigate characteristics of compact add/drop filters using etched beam splitters and total internal reflection mirrors.

Heterogeneous integration on silicon

Aurrions heterogeneous integration process enables high performance active components such as lasers, modulators, and photodetectors to be elegantly integrated on a silicon photonics platform with high performance passive components.

Heterogeneously integrated lasers on silicon

Aurrion’s heterogeneous integration process enables high performance active components such as lasers, modulators, and photodetectors to be elegantly integrated on a silicon photonics platform with high performance passive components. This platform also offers the unique capability to combine different types of active devices with separately optimized materials on the same wafer, die, and photonic integrated circuit. Similarly, devices and photonic integrated circuits operating in different wavelength bands can be formed within the same wafer and die. Experimental demonstrations show that these active components can achieve performance on par with commercially available discrete III-V components. In this paper we will discuss the advantages of Aurrion’s heterogeneous integration platform and discuss prototype demonstrations.

Heterogeneous integration of silicon photonic devices and integrated circuits

Aurrions heterogeneous integration platform enables simultaneous integration of active and passive photonic components on a silicon substrate. The platform provides photonic device library where each component is tailored to deliver maximum functionality for large scale photonic integrated circuits.

Very Compact Metal Slab Waveguide Reflectors as Integrated High Reflectivity Mirrors on High Index Contrast Waveguides

Metal slab waveguide reflectors integrated with very compact high index contrast waveguides are described, designed and simulated. Reflection and transmission characteristics of such reflectors are studied using 2-D and 3-D finite different time domain (FDTD) simulations. It is shown that the reflection and transmission coefficients can be controlled by adjusting the gap and length of metals of the reflector. Reflection coefficients much higher than cleaved facets and even higher than metal coated facets are possible. Reflection coefficients of almost 97% are achievable using only 1 μm long reflectors. The sensitivity of obtained reflection as a function of alignment errors indicates that more than 90% reflectivity is possible with 0.1 μm alignment tolerance. It is also shown that very compact Fabry-Perot resonators with FSR of 67.1 nm are possible using such reflectors. These resonators are directly coupled to input and output waveguides and have 5 μ m active length and less than 7 μm overall length including mirrors.

Metal slab waveguide reflector design for high reflection mirrors on very compact waveguides

Very high reflectance and small size metal slab waveguide reflectors that can be integrated with very compact waveguides are designed and simulated. Reflectance approaching 100% is possible for 1 mum long metal slab waveguide reflector.