Current Optics and Photonics

Optical Society of Korea (한국광학회)
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A Novel High Speed Frequency Sweeping Signal Generator in X-band Based on Tunable Optoelectronic Oscillator

  • Sun, Mingming (National Research Center for Optical Sensing/Communications Integrated Networking, Southeast University) ;
  • Chen, Han (School of Instrument Science and Engineering, Southeast University) ;
  • Sun, Xiaohan (National Research Center for Optical Sensing/Communications Integrated Networking, Southeast University)
  • Received : 2017.09.19
  • Accepted : 2018.01.19
  • Published : 2018.02.25
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Abstract

A novel X-band high speed frequency sweep signal generator based on a tunable optoelectronic oscillator (OEO) incorporating a frequency-swept laser is presented and the theoretical fundamentals of the design are explained. A prototype of the generator with tuning range from 8.8552 GHz to 10.3992 GHz and a fine step about 8 MHz is achieved. The generated radiofrequency signal with a single sideband (SSB) phase noise lower than -100 dBc/Hz@10KHz is experimentally demonstrated within the whole tunable range, without any narrow RF band-pass filters in the loop. And the tuning speed of the frequency sweep signal generator can reach to over 1 GHz/s benefiting from applying a novel dispersion compensation modular instead of several tens of kilometers of optical fiber delay line in the system.

Keywords

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FIG. 1. Experimental setup for the X-band high speed sweeping frequency signal generator based on a tunable OEO.

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FIG. 3. Measured electrical spectra from 8.8552 GHz to 10.3992 GHz.

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FIG. 4. Measured the generated 9.1992/9.2080 GHz oscillation signal.

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FIG. 5. Measured electrical spectrum and phase noise of the generated 9.1992 GHz (a) and 10.3992 GHz (b) oscillation signal with a frequency span of 100 MHz and resolution bandwidth of 910 KHz.

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