In this paper,frequency stabilization of X-band OptoElectronic Oscillator (OEO) is obtained by phase locking to an Oven-Controlled Crystal Oscillator (OCXO) through a fractional Phase-Locked Loop (PLL).The relationship between the loop transfer characteristics of PLL and the phase noise of the oscillation is analyzed.The overall phase noise performance of the OEO is improved by Self-Injection-Locking (SIL) approach,where the phase noise of the OEO is suppressed for over 20 dB within frequency offsets from 10 Hz to 10 kHz.SIL OEO is phase locked with a 100 MHz OCXO.The phase noise of the PLL-locked SIL OEO is-55 dBc/Hz at 10 Hz offset and -124 dBc/Hz at 10 kHz offset and the frequency overlapping Allan DEViation (ADEV) reaches 1.14× 10-11 at an average time of 100 s,and this validates high frequency stability of the obtained output.
NETL
NSTL
维普
万方数据
