Integrated directional couplers with photodetectors by hydride vapour phase epitaxy

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Abstract
The hydride vapour-phase-epitaxial crystal growth technique has been used to realise integrated waveguide-photodetectors and, for the first time, integrated directional coupler-photodetectors for detection in the 1.3μm to 1.55μ wavelength range. The GaInAsP waveguides which formed the directional couplers had propagation losses of 2 ± 0.5d B/cm and more than 90% of the guided light was coupled into the photodetectors. The directional couplers were symmetric with respect to the launch port and had 3dB coupling lengths of about 1.45 mm.