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http://dx.doi.org/10.5515/KJKIEES.2009.20.9.974

Phase Noise Characterization with Optical Carrier Suppression Level on Continuous Wave in the Ranges of Millimeter Waves Generated by Photomixing of Optical Double Sideband-Suppressed Carrier(DSB-SC)  

Kim, Sung-Il (Tera Devices Research Team, New Devices & Materials Research Department, Convergence components & Materials Research Laboratory, Electronics and Telecommunications Research Institute)
Kang, Kwang-Yong (Tera Devices Research Team, New Devices & Materials Research Department, Convergence components & Materials Research Laboratory, Electronics and Telecommunications Research Institute)
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Abstract
Photomixing techniques beating two optical signals with different wavelengths and strong correlations are also very useful techniques to make a continuous wave(CW) signals in the range of millimeter(mm) and terahertz(THz) frequencies. An optical double sideband-suppressed carrier(DSB-SC) technique is one of the popular techniques to generate two optical signals with different wavelengths and strong correlations. DSB-SC signals with strong correlations are generated by a CW modulation of an optical carrier with a local oscillator and an optical modulator. In the previous parers related the DSB-SC for producing the CW signals within the range of mm and THz frequencies, there have been no reports why the optical carrier should suppress. In order to clear that, we have analyzed and measured the characteristics of the mm-wave CW signals made by the DSB-SC photomixing in this paper. From our analysis and measurement results, compared with the case of the DSB with the maximized optical carrier, the power and phase noise have improved about 23.9 dB and 21 dBc/Hz(@ 1 MHz offset frequency) in the case of the DSB with the minimized optical carrier (that is to say, the DSB-SC). Consequently, it is evident reason that the optical carrier should sufficiently suppress to obtain the mm-wave CW signals with the high power and low noise. This paper has given very helpful data to make mm- and THz-wave CW signals using photomixing techniques with the DSB-SC because the reason why the optical carrier should be suppressed is reported in this paper based on the numerical and experimental results.
Keywords
DSB-SC; mm-wave; THz-wave; CW; Photomixing;
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