Abstract
We propose and experimentally demonstrate a multi-frequency optoelectronic oscillator (OEO) based on the phase-modulation to intensity-modulation conversion. A microwave photonic filter incorporating an optical fiber Bragg grating Fabry–Perot filter and an electrical yttrium iron garnet (YIG) filter in two branches are used to select the oscillation modes of the OEO. By adjusting the wavelength of laser source or the central frequency of YIG filter, two frequencies can be tuned independently within a wide range. The single sideband phase noises of the generated frequencies are measured experimentally. Moreover, the OEO shows potential ability to achieve more frequencies oscillation by multiplexing more optical and electrical filters.
Highlights
Microwave photonics studies the interaction between microwave and optical signal, whose major functions include photonic generation of microwave signals [1, 2], photonic processing of microwave signals [3,4,5], optically controlled phased array antennas, and photonic analog-todigital conversion [6]
This scheme used stimulated Brillouin scattering (SBS) effect to convert phase-modulation into intensity-modulation (PM-IM), and independently tuning of each generated frequency can be achieved by changing the wavelength of the corresponding tunable laser source
We proposed and experimentally demonstrated a multi-frequency Optoelectronic oscillator (OEO) scheme based on phase-modulation to intensity-modulation (PM-IM) conversion [18]
Summary
Microwave photonics studies the interaction between microwave and optical signal, whose major functions include photonic generation of microwave signals [1, 2], photonic processing of microwave signals [3,4,5], optically controlled phased array antennas, and photonic analog-todigital conversion [6]. The oscillation frequency is usually fixed, which is determined by weak tunability of the filter To solve this problem, many researchers have carried out their works in order to generate more than one frequency simultaneously in terms of the OEO. A tunable multifrequency OEO based on stimulated Brillouin scattering was reported by Pei Zhou [15] This scheme used stimulated Brillouin scattering (SBS) effect to convert phase-modulation into intensity-modulation (PM-IM), and independently tuning of each generated frequency can be achieved by changing the wavelength of the corresponding tunable laser source. One branch employs a microwave photonic filter (MPF) including a tunable laser source (TLS), a phase modulator (PM) a fiber Bragg grating Fabry-Perot (FBG-FP) filter and a photodetector (PD) to achieve PM-IM conversion and select one oscillation frequency. The phase noise performance of two generated signals is investigated
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