Figure 3: Experimental set-up of the hybrid self-locked and external pumping scheme. | Nature Communications

Figure 3: Experimental set-up of the hybrid self-locked and external pumping scheme.

From: Cross-polarized photon-pair generation and bi-chromatically pumped optical parametric oscillation on a chip

Figure 3

The TE polarization is pumped in a self-locked scheme16,24,38, while the TM pump field (a CW external fibre laser actively locked to the resonance) is added and extracted by two polarization beam splitters (PBSs) placed before and after the microring resonator. The amplified spontaneous emission of the amplifier is transmitted through the band-pass filter before the resonator, thus selecting the desired pump resonance. The output of the resonator is then fed back into the amplifier and acts as a seed to initiate lasing on the TE resonance. The photon pairs are extracted at the through port of the resonator and directed, after filtering out the pump fields, to detectors D1 and D2. The arrow on top of the amplifier represents the propagation direction of the light inside the cavity. The coloured spheres with arrows illustrate the frequency and polarization of the involved fields: red and blue are the TE and TM pumps, respectively, while yellow and green are the TE and TM daughter photons, respectively, generated through Type-II spontaneous FWM.

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