Optical frequency mixing apparatus
US5535044A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/60
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.