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We report a wavelength division multiplexed time-bin entangled photon pairsource in telecom wavelength using a 10 {\mu}m radius Si ring resonator. Thiscompact resonator has two add ports and two drop ports. By pumping one add portby a continuous laser, we demonstrate an efficient generation of two-wavelengthdivision multiplexed time-bin entangled photon pairs in the telecom C-band,which come out of one drop port, and are then split into the signal and idlerphotons via a wavelength filter. The resonator structure enhances four wavemixing for pair generation. Moreover, we demonstrate the double-port pumpingwhere two counter propagating pump light are injected to generate entanglementfrom the two drop ports simultaneously. We successfully observe the highlyentangled outputs from both two drop ports. Surprisingly, the count rate ateach drop port is even increased by twice as that of the single-port pumping.Possible mechanisms of this observation are discussed. Our technique allows forthe efficient use of the Si ring resonator, and widens its functionality forvariety of applications.

Wavelength division multiplexed and double-port pumped time-bin entangled photon pair generation using Si ring resonator