Qin Chaoyi, Li Xinying, Chi Nan, Yu Jianjun
Opt Express. 2016 Mar 7;24(5):4399-4404. doi: 10.1364/OE.24.004399.
We experimentally investigate high-order quadrature-amplitude-modulation (QAM) vector millimeter-wave (mm-wave) signal generation based on intensity modulator (IM) with photonic frequcney doubling and precoding in this paper. In order to obtain an ordinary QAM modulated radio-frequency (RF) signal after the square-law detection of the photodiode, amplitude and phase precoding technique should be employed. In this paper, we experimentally investigate the generation of 1~4 Gbaud vector mm-wave signal with the modulation formats of 8QAM and 16QAM at the carrier frequency of 40 GHz, and study the bit-error-rate (BER) performance of both balanced precoding scheme and unbalanced precoding scheme adopting high-order QAM modulation.
本文基于具有光子倍频和预编码的强度调制器（IM），对高阶正交幅度调制（QAM）矢量毫米波（mm-wave）信号的产生进行了实验研究。为了在光电二极管的平方律检测后获得普通的QAM调制射频（RF）信号，应采用幅度和相位预编码技术。本文实验研究了在40GHz载波频率下，采用8QAM和16QAM调制格式的1~4Gbaud矢量毫米波信号的产生，并研究了采用高阶QAM调制的平衡预编码方案和非平衡预编码方案的误码率（BER）性能。
