To implement the semiconductor-laser-based single-photon QKD for OQC in DWDM-PON, novel technologies including self-feedback DI, master-to-slave F/PLL, random DPSK protocol synthesixeralgorithm, silicon photonic single-photon QKD system-on-chip, high-Q-factor micro-ring notch filter, etc. will be established for realizing 2-D/3-D QKD/OQC architecture in 25-100km short-/long-reach metropolitanbackbone SMF DWDM-PON applications beyond 10 Gbit/s.

The DFBLD- DPSK-QKD-OQC technology employs the narrow-linewidth ultralow-drift DFBLD single-photon QKD carrier with master-slave injection lockingmutual frequency/phase locking control, combining with self-feedback 1-bit-delay interferometer with high-Q micro-RingFano notch filter,receiving by the pulsed-gating low-dark-current SPAD for realizing 25-100 km short/long distance SMF-based 2-D/3-D QKD-OQC DWDM-PON at 10Gbit/s transmission1Mbits receiving.

"DFBLD-based DPSK-QKD-OQC protocol distributortransceiver for DWDM-PON" demonstrated with novel key components such as injection-locked DPSK carrier, software-controlled/self-feedback DI, pulsed-gated SPAD, Si-Ph QKD system-on-chip,QKD protocol simulator/analyzer, has opened a new industrial era with urgent need on strengthening quantum encryptiondecryption capabilities for applications in e-commerce financial payment, government defensemedical information streaming.