Optical amplifier using nonlinear nanodefect cavity in photonic crystal

概要

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We have proposed a new optical amplifier in a photonic crystal. The amplifier consists of a nonlinear nanodefect cavity and a cross waveguide. The input–output characteristics have been simulated for the amplifier with three- or four-port cross waveguide in a two-dimensional photonic crystal by the finite-difference time-domain method. In the amplifier, a signal light can be amplified by an energy transfer from a control light to the signal light at the nonlinear nano-defect cavity. The calculated amplification factor of the amplifier was $2.33\times 10^{4}$. When optical transistor was used with an amplifier with a three-port cross waveguide in a two-dimensional photonic crystal, the calculated switching rate, the on–off ratio and the amplification factor of the transistor were 12 Gbit/s, $1.95\times 10^{5}$ and $2.29\times 10^{4}$, respectively. The transistor can work well even under a low power input in the signal port and can be utilized as a small amplifier and an optical sensor with a fast response.
2006-10-15