Develops fiber-based OQC components/protocols: single-/dual-mode DFB lasers (<100kHz bandwidth, QBER <0.5%), low-noise telecom-band CMOS Ge-on-Si SPADs, polarization-selectable meta-surface SMF couplers for on-chip entangled photon processing. Si/Si3N4 QPIC enables system-level QKD/OQC. Adaptive software optimizes DPS, BB84, COW, Decoy, MDI protocols, supporting device/algorithm development for stable QKD data transmission and decodin

DPS-QKD uses m-to-s transmitters with narrow linewidth and dual-/multi-wavelength WDM. Quenching/readout circuits support TEC-cooled macro-pixel InGaAs or Ge-on-Si SPADs for photon-number resolution. Fiberized metalens collimators reshape spots, filter bands, and enhance coupling in QKD Tx/Rx. Si-photonics implement DPS-QKD with intensity/phase-shift µRMs, applying decoy-state protocols and MPN combos to secure DPS, PEBB84, and COW vs. PNS attacks.

The "DFBLD-based DPSK-QKD-OQC protocol distributor and transceiver for DWDM-PON," featuring injection-locked DPSK carriers, software-controlled self-feedback delay interferometers, pulsed-gated SPADs, Si-photonic QKD system-on-chip, and protocol simulation tools, ushers a new industrial era addressing urgent needs for enhanced quantum encryption in e-commerce, defense, and medical data streaming.