摘要
提出一种基于单光频梳的简单,灵活和稳定的变频方法。该方法使用了双偏振正交移相器,该调制器是一种集成调制器,集成了两个双平行马赫-曾德尔调制器(DPMZM),其中一个DPMZM作为光频梳产生器,另一个进行载波抑制单边带调制产生单边带信号。从该调制器输出的信号是一个正交的耦合信号,在偏振控制器和偏振片的控制下,被转化为一个具有固定偏振角的信号,最后送入光电探测器实现微波信号的产生。仿真结果表明,通过适当调整该集成调制器中6个直流偏置点和外接的移相器,可以实现多频段变频。比如C波段3.8GHz的信号可以被变频到X,Ku,K和Ka波段;X波段9.6GHz的信号可以被下变频到C波段同时也可以被上变频到Ku,K,Ka波段。除此之外,整个系统体现出对直流偏置点漂移的良好适应性,具有很好的可操作性。
A simple,flexible and stable frequency conversion approach based on a single optical frequency comb（OFC）is proposed.In this method,a dual-polarization quadrature phase shift keying modulator（DP-QPSK）is employed.The DP-QPSK is an integrate modulator which integrates two dual-parallel Mach-Zehnder modulators（DPMZM）.One DPMZM is working as an OFC generator.Another is working as carrier suppressive single sideband modulator to generate single sideband signal.An orthogonal and coupled signal is output from this modulator.This signal is converted to a signal with fixed polarization angle under the control of polarization controller and the polarizer.After the signal is put into the photoelectric detector,the microwave signal is generated.The simulation results show that multi-band frequency conversion can be realized by properly adjusting six direct current（DC）bias points of the proposed integrate modulator and disjunctive phase shifter.For example,the signal at C band 3.8 GHz can be converted to X,Ku,K and Ka bands.The signal at X band 9.6 GHz can be down-converted to C band or upconverted to Ku,K,Ka bands.In addition,the system emerges a good adaption to the DC bias points drafting and has agood operability.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第6期217-223,共7页
Acta Optica Sinica
基金
国家自然科学基金重点项目(61571461
61401502)
陕西省自然科学基金(2016JQ6008)
关键词
光学器件
微波光子
载波抑制单边带调制
光频梳
多频段变频
变频性能
optical devices
microwave photonics
carrier suppression single sideband modulation
optical frequency comb
multi-band frequency conversion
frequency conversion performance
