Wide frequency tuning path entanglement and frequency entanglement chip based on Mach-Zehnder interferometer
An interferometer and frequency tuning technology, applied in the fields of quantum information technology, optoelectronic technology and nonlinear optics, to achieve high-efficiency quasi-phase matching optical frequency conversion and high stability
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[0050] Embodiment 1: Titanium-diffused lithium niobate waveguide chip based on multi-period polarization and MZ interferometer:
[0051] The distance between the two parallel waveguides 22 and 23 in the first waveguide beam splitter is 4 μm and the length is 850 μm. The parameter settings of the two parallel waveguides 33 and 34 in the second waveguide beam splitter are the same as those of the first waveguide beam splitter. Incident pump light Be 1250-1640nm, take 10nm as wavelength increment, measured the transmittance of the first beam splitter (T 2 ). The second set of electrodes 28, 29, 30 is arranged to be 5mm long. When the voltage of the second set of electrodes is V c When , the MZ interferometer achieves balanced beam splitting for different frequencies. image 3 (a) is the change value of the transmittance of the first beam splitter with wavelength; image 3 (b) is the wavelength range required to make the MZ interferometer a balanced beam splitter (50:50 beam s...
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