As far as channel multiplexing technology of quantum and classical optical communication is concerned, the main problem is mutual crosstalk. Quantum channel and classic channel multiplex the same optical fiber, which needs to be carefully designed and optimized for avoiding and suppressing disturbance of classical strong light on the single-photon level quantum channel. Due to Raman scattering, Brillouin scattering and other physical processes, part of classical strong light stays within wavelength range of the quantum signal, and cannot be completely eliminated. Joint testing carried out in commercial optical fiber by QuantumCTek, optical transmission equipment manufacturers and telecom operators has proved that solution provided by QuantumCTek is workable and successful. Single optical fiber multiplexing is feasible among quantum key distribution system and OTN, MSTP or other optical transmission system, which significantly reduces overheads for optical fiber resources, and supports any universally applicable deployment scenarios.

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