| 摘要 |
PROBLEM TO BE SOLVED: To provide a light intensity modulator capable of modulating/ demodulating guided light propagating in an optical waveguide by the simple constitution and a light-wave range finder measuring a distance to a target. SOLUTION: A first electrode pair 37 and a second electrode pair 38 are provided on the linear waveguides 21, 22 of a MZ type light intensity modulator provided with linear waveguides 19, 21, 22, 24 and Y-branches 20, 23. The electrode pair 37 becomes a traveling-wave electrode to the light traveling from the Y-branch 20 to the Y-branch 23 when a RF wave is impressed from a RF generator 33 and the electrode pair 38 becomes a traveling-wave electrode to the light traveling from the Y-branch 23 to the Y-branch 20 when a RF wave is impressed from a RF generator 34. They become the traveling-wave electrodes to the light beams propagating in the reverse directions to each other. Consequently, mutually individual modulator is provided for transmitting light and returned light in one MZ type waveguide. |
