We describe the fabrication and operation of an optical power monitor, monolithically integrated with a silicon-on-insulator rib waveguide. The device consists of a p(+)-v-n(+) structure with a detection volume coincident with the single-mode supporting waveguide. Detection of optical signals at wavelengths around 1550 nm is significantly enhanced by the introduction of midband-gap generation centers, which provide partial absorption of the infrared light. The most efficient device extracted 19% of optical power from the waveguide and showed a responsivity of 3 mA/W. These devices are fabricated using current standard processing technology and are fully compatible with silicon waveguide technology and integrated operational amplifier circuits. (c) 2005 American Institute of Physics.
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