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Spontaneous parametric downconversion is an essential technique in quantumoptics experiments. In this paper, various quasi-phase-matching processes inseveral typical periodically polarized nonlinear materials are analyzed andcalculated. Furthermore, a general method for realizing multiple types ofquasi-phase-matching in a monolithic material is presented. Finally, a noveldesign to prepare multiple entangled photon pairs based on the Sagnacinterferometer is discussed. This technology can be applied to tiny opticalpaths in the telecom C band, saving both cost and space.

Telecom-band Multi-Type Spontaneous Parametric Downconversion in Periodically Polarized Nonlinear Materials