使用椭圆或圆偏振激光的光学自净差相干系统

G. A. Vaitsos, N. Théofanous
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引用次数: 0

摘要

相干检测作为光信号的解调过程,在现代光通信中有着广泛的应用。在该技术的某些配置中,存在于光信号的频率或相位中的信息可以通过使用同一光束作为载波和作为本振信号来获得。在本文中,我们对这种由激光源、电光调制器、光电探测器和所有必要的光学元件组成的自净差系统进行了理论分析。整个分析附带了一个pc支持的程序,它提供了在光电探测器上具有相同入射光功率的各种光偏振下研究系统的可能性,而独立于各种光学元件。此外,在我们引入直流电压和交流电压作为信号之后,该程序提供了随意改变各自值的可能性。最后,通过对输出信号频谱的各种谐波的研究,可以发现圆偏振与其他类型的偏振相比所具有的优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optical self-homodyne coherent system using elliptically or circularly polarized laser light
Coherent detection, as a process for demodulation of an optical signal, is used to a great extent in modern optical communications. In some configurations of this technique, the information which exists in the frequency or the phase of the optical signal can be derived by using the same beam as a carrier and as a local-oscillator signal too. In this communication, we present a theoretical analysis of such a self-homodyne system, which is composed of a laser source, an electrooptic modulator, a photodetector and all the necessary optical components. The whole analysis is accompanied with a PC-supported program, which offers the possibility to study the system for various kinds of optical polarization but with the same incident optical power on the photodetector, independently of the various optical components.Furthermore, this program provides the possibility of changing the respective values at will, after we have introduce direct and alternating voltage as a signal. Finally, the study of the various harmonics of the output signal's spectrum gives the possibility to discover the advantages that the circular polarization offers compared with other kinds of polarization.
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