基于光相位锁定的载波可变光的毫米波产生技术

Optical millimeter-wave generation with subcarrier variable based on optical phase locking

提出和实现了一种新型适用于光/无线混合接入的光子载微波产生方案.该方案利用直接调制分布反馈式半导体激光器可以产生宽谱信号的特点,将较低频率正弦信号直接调制半导体激光器,在半导体激光器中进行频谱展宽,然后把宽谱信号注入到多个半导体激光器中进行相位锁定从而作为相干锁定光源.用上述光源在不同波长加载不同信号进行传输,在接收端使用不同通带特性的光学滤波器对信号进行处理,可以选择接收基带信号、光子微波时钟信号、上行光源或不同载波频率的光子微波调制信号.作为验证,分别完成了2.5 Gbps基带信号、20 GHz和40 GHz光副载波调制信号的产生与接收.因为受限于试验条件,只进行了原理验证,但该系统理论上可集成波导设计,无需高频调制器件,并可生成更高载频光子微波信号,有利于未来的光/无线混合接入和超密集波分复用系统.

A novel scheme for the generation of photonic millimeter-wave was proposed, which is applicable to optical/ wireless hybrid access network. Based on the characteristic that a wide spectrum signal can be produced by modulating a distributive feedback semiconductor laser, a laser is directly modulated with low-frequency sinusoidal signal. The laser＇ s spectrum is broadened and then injected into a series of phase-locked semiconductor lasers to make themselves coherent light sources. The light sources are used to load different signals at different wavelengths for transmission. At the receiv- ing end, optical filters with different passband characteristics are used for signal processing, selectively receiving the baseband signal, optical microwave clock signal, and the uplink light sources or up conversion signals modulated with different subcarrier frequency. As verification, the generation and reception of subcarrier-modulated optical signal for 2.5 Gbps baseband signal, 20 GHz and 40 GHz are completed. Due to the limited experimental conditions, only the the- oretical verification was conducted. Though, as the system can be integrated with waveguide design, an optical micro- wave signal with higher carrying frequency can be generated. It is very beneficial to future optical/wireless hybrid access and the system of ultra-dense wavelength division multiplexing.