Abstract

We have fabricated high-speed Si metal–semiconductor–metal photodetectors using¹⁹ F⁺ ion implantation in low-doped Si. Bandwidths in excess of 6 GHz have been obtained that represent more than an order-of-magnitude improvement over unimplanted counterparts. Measurements with short optical pulses show that the increase in bandwidth is due primarily to a shorter carrier lifetime in implanted devices. In the absence of implantation, the response under short optical pulse excitation has a long decay with a time constant of ∼0.35 ns. We carried out an optical fiber transmission experiment using a GaAs (λ ∼ 0.85 µm) laser source and the implanted Si photodetector. Error-free transmission (bit error rate < 10^-11) with good receiver sensitivity was obtained at 2 Gbits/s. These results demonstrate that implanted Si can be used as a detector for short-wavelength fiber-optic communication systems for speeds to a few gigabits per second. Monolithic integration of this detector technology with conventional Si processing offers the potential for low-cost receiver designs.

© 1997 Optical Society of America

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