Wu Xiao, Li Xuefeng, Ren Li, Liu Hongjun
Appl Opt. 2022 Nov 10;61(32):9609-9615. doi: 10.1364/AO.472444.
The optical modulation conversion of a quadrature phase-shift keying (QPSK) signal to two binary phase-shift keying (BPSK) signals is theoretically realized in a phase-sensitive amplification (PSA) conversion system. We propose a multi-slot silicon-carbon nanotube/polydimethylsiloxane hybrid waveguide to achieve high nonlinearity of 10 for improving PSA performance. Constellation diagrams, error vector magnitude, and bit error rate (BER) are used to investigate and measure the performance of the output. The results show that the converted BPSK signal has more than a 10 dB higher signal-to-noise ratio than the QPSK signal with a BER threshold of 10. Furthermore, the system has great potential for hierarchical modulation of advanced format signals and long-distance transmission.
在一个相敏放大（PSA）转换系统中，理论上实现了将正交相移键控（QPSK）信号的光调制转换为两个二进制相移键控（BPSK）信号。我们提出了一种多槽硅 - 碳纳米管/聚二甲基硅氧烷混合波导，以实现10 的高非线性，从而改善PSA性能。使用星座图、误差矢量幅度和误码率（BER）来研究和测量输出性能。结果表明，在误码率阈值为10时，转换后的BPSK信号比QPSK信号具有超过10 dB的更高信噪比。此外，该系统在高级格式信号的分层调制和长距离传输方面具有巨大潜力。
