研究目的
Investigating the applicability of QAM/QNSC encryption technology in IM/DD system for secure optical communication.
研究成果
The proposed OFDM-QAM based QNSC scheme for IM/DD transmission demonstrates a Q penalty of only 1.6 dB compared to QPSK without encryption, proving its feasibility for secure long-distance optical communication.
研究不足
The complexity and cost of coherent transmission technology are higher than IM/DD optical system, which may limit its applicability in certain scenarios.
1:Experimental Design and Method Selection:
The study employs a QAM-based quantum noise stream cipher (QNSC) scheme for IM/DD transmission using OFDM modulation.
2:Sample Selection and Data Sources:
A pseudo-random binary sequence (PRBS) with a length of 215 is adopted for mapping into QPSK constellation.
3:List of Experimental Equipment and Materials:
Includes an arbitrary waveform generator (AWG), Mach-Zehnder modulator (MZM), variable optical attenuator (VOA), EDFA, optical spectrum analyzer (OSA), and a 20GSa/s real-time oscilloscope.
4:Experimental Procedures and Operational Workflow:
The QPSK signal is encrypted by 256 QAM and modulated by IM/DD OFDM modulation, then transmitted over 1000 km.
5:Data Analysis Methods:
The received signal is processed offline through digital signal processing (DSP) to obtain the decrypted QPSK signal.
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