A photonic system is proposed to calibrate the instantaneous frequency and glitches of a fast frequency sweeping oscillator using a pseudo random bit sequence (PRBS) frequency comb. Its performance is demonstrated by simulations and experiments. A vector signal generator (Agilent E8257D), whose frequency ranges from 0.5 to 2.5 GHz and from 2.5 to 5 GHz, respectively, is calibrated. The deviation from linearity of frequency sweeping is measured to be less than 0.02%. As an extension of the calibrating system, the characterized sweeping oscillator is applied to multi-tone radio frequency (RF) measurement with an accuracy of 5 kHz and a resolution of 1 MHz. This technique will find applications in the field of electronic warfare and communication systems.
© 2013 IEEE
Kun Xu, Li Yan, Feifei Yin, Yitang Dai, Junyi Zhang, Jianqiang Li, Yuefeng Ji, and Jintong Lin, "Photonic Calibration of Sweeping Oscillator and Its Application to RF Measurement," J. Lightwave Technol. 32, 55-62 (2014)