Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Tunable Low Phase-noise Microwave Generation Utilizing an Optoelectronic Oscillator and a Fiber Bragg Grating

  • Received : 2017.11.30
  • Accepted : 2018.01.16
  • Published : 2018.02.25
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Abstract

A tunable low-phase-noise microwave generation structure that utilizes an optoelectronic oscillator (OEO) and a fiber Bragg grating (FBG) is proposed and experimentally demonstrated in this article. This structure has no particular requirement for the band width of the laser, and its tunability is realized through adjusting the central frequency of the tunable FBG. A detailed theoretical analysis is established and confirmed via an experiment. A high-purity microwave signal with a frequency tunable from 6 to 12 GHz is generated. The single-sideband phase noise of the generated signal at 10.2 GHz is -117.2 dBc/Hz, at a frequency offset of 10 kHz.

Keywords

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FIG. 1. Schematic diagram of the proposed OEO structure.

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FIG. 2. The single-loop transfer process of the OEO.

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FIG. 3. Measured transmission frequency response of the tunable FBG used in the experiments.

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FIG. 4. Spectra of the optical signals generated by the OEO, for different central frequencies of the FBG.

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FIG. 5. Measured spectrum of (a) the rf oscillation signal and (b) the phase noise of the generated 10.2-GHz microwave signal.

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FIG. 6. Spectra of the generated signal when the frequency was tuned from 6 to 12 GHz.

TABLE 1. The signal amplitude of every sideband and the corresponding filter gain

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