基于并联DPMZM的大动态范围微波光子混频系统

doi:10.11959/j.issn.1000-436x.2021003

Abstract

Abstract:

To solve the problems of nonlinear distortion and limited dynamic range of microwave photonics mixing system, a large dynamic range microwave photonics mixing system based on parallel dual parallel Mach-Zehnder modulator (DPMZM) was proposed.The parallel modulation of radio frequency and local oscillator signals was realized by using DPMZM.The third-order intermodulation distortion (IMD3) in the output intermediate frequency signal was eliminated by configuring the electro-optic modulation index of the two parallel channels and the working point of the modulators.Finally, the dynamic range of the system was improved.Simulation results show that the proposed scheme can suppress IMD3 by 17.7 dB and increase the SFDR to $127.8 dB \cdot {Hz}^{\frac{4}{5}}$ .

Key words: microwave photonics, mixer, dynamic range, parallel DPMZM

CLC Number:

TN29

Yongsheng GAO, Fangjing SHI, Jiajun TAN, Yangyu FAN. Large dynamic range microwave photonics mixing system based on parallel DPMZM[J]. Journal on Communications, 2021, 42(1): 48-56.

Figures/Tables 10

信号源输出端调制指数	调制器输入端调制指数	调制器输入端调制指数具体表达式
m_RF	m_RF1	$\frac{m_{RF}}{\sqrt{2}}$
	m_RF2	$\frac{\sqrt{α_{1}} m_{RF}}{\sqrt{2}}$
m_LO	m_LO1	$\frac{\sqrt{α_{2}} m_{LO}}{\sqrt{2}}$
	m_LO2	$\frac{m_{LO}}{\sqrt{2}}$

References 20

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参数	对比方案	本文方案
激光器功率/ dBm	16	16
激光器RIN/ (dB·Hz^-1)	-155	-155
激光器线宽/MHz	1	1
调制器个数/个	1	2
调制器半波电压/V	3.5	3.5
调制器差损/dB	4	4
调制器工作点	最小点（3个）	最小点（6个）
电衰减器/dB	无	4.77、14.31
PD响应度/(A·W^-1)	0.75	0.75

Large dynamic range microwave photonics mixing system based on parallel DPMZM

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