title: Spurious mode reduction in dual injection-locked optoelectronic oscillators.
abstract: Optoelectronic oscillators (OEOs) are promising sources of low phase noise radio frequency (RF) signals. However, at X-band frequencies, the long optical fiber delay line required for a high oscillator Q also leads to spurious modes (spurs) spaced too narrowly to be filtered by RF filters. The dual injection-locked OEO (DIL-OEO) has been proposed as a solution to this problem. In this work, we describe in detail the construction of a DIL-OEO. We also present experimental data from our systematic study of injection-locking in DIL-OEOs. With this data, we optimize the DIL-OEO, achieving both low phase noise and low spurs. Finally, we present data demonstrating a 60 dB suppression of the nearest-neighbor spur without increasing the phase noise within 1 kHz of the 10 GHz central oscillating mode.
authors: US Army Research Laboratory, Adelphi, Maryland, USA. olukayode.okusaga@us.army.mil
authors: O
authors: O
authors: Okusaga
authors: E J
authors: EJ
authors: Adles
authors: E C
authors: EC
authors: Levy
authors: W
authors: W
authors: Zhou
authors: G M
authors: GM
authors: Carter
authors: C R
authors: CR
authors: Menyuk
authors: M
authors: M
authors: Horowitz
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008872:Microwaves; D008962:Models, Theoretical; D055096:Optical Devices; D009991:Oscillometry / Q000295:instrumentation*; D011846:Radio Waves; D012542:Scattering, Radiation; D013685:Telecommunications / Q000295:instrumentation*