Abstract
We report the design of an integrated visible-telecom photon pair source based on Counter Propagating Spontaneous Four Wave Mixing (CP-SFWM) in a Silicon Nitride (Si3N4) chip with no need of dispersion profile engineering. Two lasers are pumped at 800 nm and 1550 nm at both ends of the optical fiber, generating signal and idler photons at the same wavelengths but with opposite propagation directions, relative to their corresponding pumps. Moreover, these photons exhibit a spectral bandwidth on the order of MHz, achieved by using a high Q factor ring resonator.
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