| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize high extinction ratio optical switch operation by a control beam pulse of low energy in an optical switch using a signal beam frequency shift accompanying a resonance excitation nonlinear optical effect in a semiconductor. SOLUTION: A signal beam pulse of a frequencyω1 and the control beam pulse of the frequencyω0 are inputted to a nonlinear optical waveguide 1. At this time, control beam pulse width is set in a value smaller than signal beam pulse width. The optical waveguide part of the nonlinear optical waveguide 1 consists of a nonlinear optical medium showing a nonlinear refractive index change by the absorption or the amplification of the control beam. The frequencyω1 of the signal beam is set in the transparent area of the nonlinear optical waveguide 1. When the frequencyω0 of the control beam is set in the absorption area of the nonlinear optical waveguide 1, a frequency shift to a high frequency side occurs in a part of the signal beam pulse made incident together with the control beam. An optical frequency filter 2 outputs only a component that the frequency is shifted. Thus, the optical switch operation by the control beam pulse of the low energy is realized.</p> |
