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We present the design and realization of a 1×4 switching matrix, based on an electro-optical directional coupler. This matrix is devoted to true time delay systems. It is characterized by an original topology that reduces global power consumption down to 20 mW. Fiber-to-fiber losses are 15 dB, and the crosstalk is lower than -20 dB. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 243–246, 1998. [ABSTRACT FROM AUTHOR]

It is shown that local and large lattice mismatch epitaxies could be useful techniques for the fabrication of optoelectronic integrated circuits. As an example, we fabricated a monolithic resonant photoreceiver which associates a long-wavelength metal-semiconductor-metal photodetector, a GaAs MESFET preamplifier, and an inductor. The GaAs / GaInAs heteroepitaxy needed for the photodetector wax selectively grown using a SiO[sub2] mask and the entire circuit was fabricated on a silicon substrate. Compared to a PIN photodiode loaded with a 50-ω resistor, more than 10 dB gain was measured at 7 GHz in a microwave optical link. [ABSTRACT FROM AUTHOR]