Li Yitong, Yu Jianguo, Song Ruiliang, Liu Ning
Opt Express. 2022 Jan 3;30(1):436-446. doi: 10.1364/OE.447253.
We experimentally demonstrated a novel and simple scheme to generate D-band millimeter-wave (mm-wave) signal without optical filter based on optical carrier suppression (OCS) and single-sideband (SSB). One intensity modulator (IM) driven by radio frequency (RF) signal at 50 GHz is firstly employed to generate two tones with channel spacing of 2 x RF frequency based on OCS. Another subsequent in-phase/quadrature (I/Q) modulator driven by RF signal at 30 GHz is then applied to generate SSB signal by using independent sideband (ISB). No optical filter is needed so that the whole system can be simplified. After using a D-band photomixer for detection, we finally generated the vector mm-wave at 130 GHz. Based on the proposed system, 4-Gbaud/8-Gbaud quadrature phase shift keying (QPSK) information carried by the generated D-band mm-wave signals were transmitted over 22.5-km single model fiber (SMF) and 1-m wireless distance radio-over-fiber (ROF) link. Bit-error-ratio (BER) performances under hard/soft-decision forward-error-correction (FEC) threshold are shown respectively in cases of two different signals transmission rates.
我们通过实验证明了一种新颖且简单的方案，该方案基于光载波抑制（OCS）和单边带（SSB），无需光学滤波器即可生成D波段毫米波（mm-wave）信号。首先使用一个由50 GHz射频（RF）信号驱动的强度调制器（IM），基于OCS生成两个频率间隔为2倍RF频率的音调。随后，另一个由30 GHz RF信号驱动的同相/正交（I/Q）调制器通过使用独立边带（ISB）来生成SSB信号。由于无需光学滤波器，整个系统得以简化。在使用D波段光混频器进行检测后，我们最终生成了130 GHz的矢量毫米波。基于所提出的系统，由生成的D波段毫米波信号承载的4-Gbaud/8-Gbaud正交相移键控（QPSK）信息在22.5公里的单模光纤（SMF）和1米的无线距离光纤无线（ROF）链路中进行了传输。在两种不同信号传输速率的情况下，分别展示了硬判决/软判决前向纠错（FEC）阈值下的误码率（BER）性能。
