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Brillouin instantaneous frequency measurement with an arbitrary response for potential real-time implementation
Optics Letters
|April 16, 2019
Summary
We developed a novel Brillouin instantaneous frequency measurement (IFM) technique. This method utilizes stimulated Brillouin scattering (SBS) for rapid, wide-ranging frequency measurements with reduced bandwidth requirements.
Area of Science:
- Photonics
- Optical Engineering
- Signal Processing
Background:
- Instantaneous frequency measurement (IFM) is crucial for high-speed signal analysis.
- Traditional IFM techniques face limitations in range and bandwidth.
- Stimulated Brillouin scattering (SBS) offers a unique physical phenomenon for optical signal processing.
Purpose of the Study:
- To demonstrate an arbitrary-response Brillouin instantaneous frequency measurement (IFM) scheme.
- To leverage frequency-to-power mapping in SBS for IFM.
- To achieve wideband IFM with reduced digital sampling bandwidth.
Main Methods:
- Utilizing stimulated Brillouin scattering (SBS) with a frequency-swept local pump lightwave.
- Implementing frequency-to-power mapping within the SBS interaction.
- Controlling the sweeping period to be less than twice the flight-of-time in the SBS interaction length.
- Experimentally verifying the scheme with a Costas frequency coded pulse.
Main Results:
- Achieved an arbitrary-response Brillouin IFM.
- Demonstrated a frequency measurement range of 6 GHz in the Ku band without averaging.
- Reduced the required digital sampling bandwidth to 50 MHz.
- Verified the feasibility of the proposed Brillouin IFM scheme through experimental measurement.
Conclusions:
- The proposed Brillouin IFM scheme enables arbitrary response and wideband frequency measurement.
- The technique significantly reduces the bandwidth requirements for digital sampling.
- This advancement has potential applications in high-speed optical signal processing and analysis.
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