Microwave photon waveform generation device and method based on cyclic frequency shift
A technology of microwave photons and generating devices, which is applied in the field of microwave photons, can solve problems such as the influence of waveform accuracy and the inability to completely suppress the second-order harmonic components, and achieve the effect of pure spectral components and suppression of second-order harmonic components
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Embodiment 1
[0087] In the case of the same frequency shift, different filtering curves of the band-pass filter correspond to different microwave waveforms.
[0088] Optical carrier wavelength λ=1550nm, frequency shift f s =20GHz, loop delay τ=10 -8 s, the optical carrier power is 0dBm, when the filtering curve of the filter is flat-top type, the generated rectangular wave is as follows Figure 6 As shown, the period of the obtained rectangular wave is 50ps.
[0089] When the filtering curve of the filter is adjusted to be trapezoidal, other parameters remain unchanged, and a 90-degree electric phase shifter is added behind the photodetector to generate a triangular wave such as Figure 7 shown.
[0090] To sum up, in the case of the same frequency shift amount, the device and method can be used to generate microwave waveforms with tunable waveforms.
Embodiment 2
[0092] In the case of the same waveform, different frequency shift amounts correspond to triangular waves of different frequencies.
[0093] In Example 1, the amount of frequency shift is 20GHz, adjust the amount of frequency shift to 5GHz, the frequency of the obtained triangular wave is 5GHz, and the time domain waveform is as follows Figure 8 shown. Figure 9 The spectrum diagram corresponding to the 5GHz triangular wave can be seen from the spectrum diagram, which only contains the first-order 5GHz harmonic and the third-order 15GHz harmonic. The power ratio between the two is about 20dB, which is close to the ideal power ratio of 19.085dB.
[0094] To sum up, under the condition that the waveform remains unchanged, the device and method can be used to generate microwave waveforms with adjustable frequency.
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