| 摘要 |
An optical analog-digital converter comprises a nonlinear optical element having a threshold value for the intensity of an input light and producing a first and a second output light from the input light with the threshold value as a reference. The optical element produces a first output light of intensity corresponding to a digital signal meaning the digital 0 and a second output light of intensity proportional to the input light intensity when the intensity of the input light is smaller than the threshold value, and produces a first output light of an intensity corresponding to a digital signal meaning the digit 1 and a second output light of intensity equal to the input light intensity minus the threshold value when the intensity of the input light is greater than the threshold value. A device inputs to the nonlinear optical element a light having an intensity distribution corresponding to an analog signal, an optical feedback system causes the second output light of the nonlinear optical element produced from the input light to be again input to the nonlinear optical element, and a device provided in the feedback system amplifiers the second output light.
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