Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1995-06-07
1996-07-09
Hellner, Mark
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359191, 356 509, 356 515, H04B 1006, G01C 308
Patent
active
055350445
ABSTRACT:
An optical frequency mixing apparatus is provided. Mixing of a frequency of an incident light intensity and a frequency (f.sub.3) of an AC signal generated by a signal generator, i.e., product calculation of the two signals is executed by a photoconductive photodetector of a photodetecting unit. This apparatus has a large allowance for unnecessary incident light such as background light and output characteristics having satisfactory linearity with respect to the incident light intensity, and can deeply set gain modulation. One of the frequency components of the sum and difference between the two signals, which is obtained as a result of product calculation, is selected and extracted using a frequency selector. As an incident optical signal, one optical signal whose light intensity has an AC component (frequency=f.sub.1) may be used. Alternatively, two optical signals whose light intensities have different frequencies (frequencies=f.sub.1 and f.sub.2) may be incident on substantially the same photodetecting area of the photoconductive photodetector.
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Koishi Musubu
Takeshima Akira
Hamamatsu Photonics K.K.
Hellner Mark
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