Tseng Chin-Hao, Lin Chun-Ting, Hwang Sheng-Kwang
Opt Lett. 2020 Dec 15;45(24):6819-6822. doi: 10.1364/OL.412327.
Microwave generation and modulation over the V- and W-bands are investigated using a semiconductor laser subject to both comb-like optical injection and direct modulation. The former not only excites period-one (P1) nonlinear dynamics for tunable microwave generation but also improves the stability and purity of such generated microwaves. The latter upconverts data onto the generated microwaves by superimposing the data effectively only onto the lower oscillation sideband of the P1 dynamics, which prevents the data from dispersion-induced degradation over fiber distribution. As a result, microwaves that are continuously tunable from 40 to 110 GHz with a 3-dB linewidth of less than 1 Hz and with phase noise better than -95/ at 10-kHz offset are generated. A bit-error ratio better than the forward error correction limit, 3.8×10, is achieved for 12-Gb/s 16-quadrature amplitude modulation data after 25-km fiber distribution.
利用受梳状光注入和直接调制的半导体激光器，研究了V波段和W波段的微波产生与调制。前者不仅激发用于可调谐微波产生的周期一（P1）非线性动力学，还提高了此类产生的微波的稳定性和纯度。后者通过仅将数据有效地叠加到P1动力学的较低振荡边带来将数据上变频到产生的微波上，这防止了数据在光纤分布上因色散而退化。结果，产生了频率在40至110 GHz之间连续可调、3 dB线宽小于1 Hz且在10 kHz偏移处相位噪声优于-95 dBc/Hz的微波。在25 km光纤分布后，对于12 Gb/s 16正交幅度调制数据，实现了优于前向纠错极限3.8×10⁻³的误码率。
