研究目的
To generate linearly-chirped microwave waveforms with tunable center frequency and expandable time-bandwidth product (TBWP).
研究成果
A method to generate linearly-chirped microwave waveform with tunable center frequency and expandable TBWP has been demonstrated. A TBWP up to ~166.4 was achieved, with potential for larger values if measurement devices are improved.
研究不足
The bandwidth of the oscilloscope limits the capture of frequency components beyond 32 GHz.
1：Experimental Design and Method Selection:
The method involves using two dispersion compensation fibers (DCFs) to introduce different chirps into optical pulses via wavelength-to-time mapping effect. Two tunable optical filters (TOFs) are used to independently and flexibly control the center frequency and sweeping bandwidth of the generated microwave signal.
2：Sample Selection and Data Sources:
A mode-locked laser (MLL) with a pulse repetition rate of 37 MHz is used as the optical source.
3：List of Experimental Equipment and Materials:
Equipment includes a mode-locked laser, optical couplers, tunable optical filters, dispersion compensation fibers, a variable optical delay line, an erbium doped fiber amplifier, and an ultra-fast photo-detector.
4：Experimental Procedures and Operational Workflow:
Optical pulses are divided into two arms, their spectra are shaped by TOFs, different chirps are introduced via DCFs, and the signals are then coupled, amplified, and converted into a microwave waveform.
5：Data Analysis Methods:
The generated waveforms are measured using an oscilloscope and analyzed using short-time Fourier transform (STFT).
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photo-detector
XPDV4120R
Finisar
Converts the optical signal into a microwave waveform.
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oscilloscope
DSAX93204A
Agilent
Measures the generated waveforms.
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tunable optical filter
CVF-220CL
Alnair Labs
Shapes the optical spectra of the pulses.
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mode locked laser
Used as the optical source.
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optical coupler
Divides the optical pulses into two arms.
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dispersion compensation fiber
Introduces different chirps into the optical pulses.
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variable optical delay line
MDL-002
General Photonics
Compensates for time offset between two arms.
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erbium doped fiber amplifier
Amplifies the optical signal.
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