We report high-speed optical modulation in a resonant tunneling relaxation oscillator consisting of a resonant tunneling diode ͑RTD͒ integrated with a unipolar optical waveguide and incorporated in a package with a coplanar waveguide transmission line. When appropriately biased, the RTD can provide wide-bandwidth electrical gain. For wavelengths near the material band edge, small changes of the applied voltage give rise to large, high-speed electroabsorption modulation of the light. We have observed optical modulation at frequencies up to 14 GHz, associated with subharmonic injection locking of the RTD oscillation at the fundamental mode of the coplanar transmission line, as well as generation of 33 ps optical pulses due to relaxation oscillation.
The completed detailed design and initial phases of construction of an optoelectronic crossbar demonstrator are presented. The experimental system uses hybrid very large scale integrated optoelectronics technology whereby In CaAs-based detectors and modulators are flip-chip bonded onto silicon integrated circuits. The system aims to demonstrate (a 1-Tb/s aggregate data input/output to a single chip by means of free-space optics
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