基于马赫曾德尔调制器的倍频因子和输出相位可调的微波光子移相器

燕颖; 马健新

doi:10.37188/CO.EN.2022-0019

基于马赫曾德尔调制器的倍频因子和输出相位可调的微波光子移相器

燕颖,
马健新^,

北京邮电大学电子工程学院信息光子学与光通信国家重点实验室天地互联与融合北京重点实验室, 北京 100876

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中图分类号: O482.31
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出版历程
- 收稿日期: 2022-10-08
- 修回日期: 2022-10-18
- 录用日期: 2022-10-31
- 网络出版日期: 2022-12-09

Microwave photonic RF frequency multiplying phase shifter with tunable multiplication factor and a full 360-deg tunable range

doi: 10.37188/CO.EN.2022-0019

YAN Ying,
MA Jian-xin^,

State Key Laboratory of Information Photonics and Optical Communication, and Beijing Key Laboratory of Space-Ground Interconnection and Convergence, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Funds: Supported by the Fund of State Key Laboratory of IPOC (No. IPOC2020ZT06)

More Information

Author Bio:
YAN Ying (1997—), female, born in Shanxi Province, master student. She obtained a bachelor’s degree from University of Science and Technology Beijing in 2016, and now is a master’s degree candidate at the Beijing University of Posts and Telecommunications, China. She is mainly engaged in microwave photonics technology. E-mail: 13263209188@163.com

Ma Jian-xin (1977—), male, born in Henan Province, Ph.D., professor and doctoral supervisor. He received the Ph.D. degree in optical communication from the Beijing University of Posts and Telecommunications, China, in 2007. He is currently a Professor at the Beijing University of Posts and Telecommunications. He has authored or coauthored more than 100 scientific publications appearing in journals or international conferences. His research interests include microwave photonics and optical communications. E-mail: majianxinxy@163.com

Corresponding author: majianxinxy@163.com

摘要

摘要:
提出一种倍频因子连续可调，且相位连续变化的微波光子移相系统。该方案使用两个并联的马赫曾德尔调制器，通过2×2光耦器与两个双并联的集成马赫曾德尔调制器级联，产生可调节的±1~4阶边带，并使用相位调制器对其中一个光波进行相移。通过调整DPMZM的射频驱动信号和直流偏置电压以及PM的直流电压，可以产生相位从0到360°连续可调的2到8次谐波。仿真结果表明，当射频信号频率为10 GHz时，可产生频率为20~80 GHz的微波信号。当相位调制器的直流偏置电压与半波电压比值在0到2间变化时，对应微波信号的相位从0°到360°变化，可以获得约20 dB的大光边带抑制比（OSSR）和电杂散抑制比（ESSR）。此外，分析了调制器消光比对输出微波信号光载波抑制比和电杂散抑制比的影响，以及光载波的波长和功率对微波信号幅度波动的影响。
- 微波光子学 /
- 移相器 /
- 倍频 /
- 马赫-曾德尔调制器
Abstract:
A filterless Microwave Photonic Phase Shifter (MPPS) with a tunable Frequency Multiplication Factor (FMF) and a full 360-deg tunable range is theoretically analyzed and verified by simulation. In the scheme, two parallel Mach-Zehnder Modulators (MZM), cascaded with two Dual-Parallel integrated Mach-Zehnder Modulators (DPMZM) by a 2×2 Optical Coupler (OC), are used to generate the ±1st- to 4th-order sidebands adjustably, and a Phase Modulator (PM) is used to phase shift one of the two lightwaves. After photodetection, the 2nd- to 8th- order harmonics with a continuously tunable phase shift from 0 to 360-deg can be generated by adjusting the RF driving signal and the DC bias voltage of the DPMZM, and the DC voltage of the PM. Simulation results demonstrate that both 360-deg continuously tunable phase shift and frequency multiplication can be implemented. Large Optical Sideband Suppression Ratio (OSSR) and Electrical Spurious Suppression Ratio (ESSR) of around 20 dB can be obtained. The phase shifter wavelength insensitive performance has been also evaluated by simulation.
- microwave photonics /
- phase shifter /
- frequency multiplication /
- Mach-Zehnder modulator

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Figure 1. Schematic diagram of the proposed microwave photonic FMPS

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Figure 2. The simulation setup of the proposed MPPS

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Figure 3. Optical spectra of the CS-DSB modulated signal from the MZM₁(a) and MZM₂(b) and CS-SSB modulated signal from the upper (c) and lower (d) port of the OC₁

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Figure 4. (a) Optical spectra of the output of the OC₂ and (b) electrical spectra of the photocurrent output from the PD at FMF of 2

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Figure 5. Optical spectra of the output of the OC₂ and electric domain spectra with FMF at 3 (a)(b), 4(c)(d), 5 (e)(f), 6 (g)(h), 7 (i)(j) and 8 (k)(l), respectively

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Figure 6. OSSR and ESSR of the generated microwaves signal with different FMFs

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Figure 7. (a) OSSR and ESSR of the generated microwaves signal varying with power of CW laser and (b) varying with ERs of MZM₁

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Figure 8. The relationship between phase and DC voltage of PM

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Figure 9. Measured power of the generated signal at different frequencies of the optical carrier (a) and RF driving signal (c), and phase response of the FMPS at different frequencies of the optical carrier (b) and RF driving signal (d) when FMF=8

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Figure 10. OSSR and ESSR of the generated microwave signal when (a) the modulation index of MZM₁ is varied from 2.05 to 2.77 and (b) the phase difference between the two input RF signals changes from 16° to 75° when FMF=8

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Table 1. Performance comparison of different schemes

Ref	Phase shift range/(°)	Linear phase shift	FMF	filter	stability
[18]	360	No	4	Yes	No
[19]	360	No	2	Yes	No
[20]	360	Yes	2	Yes	No
[21]	360	Yes	2	No	No
[22]	360	No	4	No	No
[23]	360	No	2/4	No	No
[24]	360	No	2/4/8	Yes	No
[25]	360	Yes	2/4/6	No	No
proposed method	360	Yes	2/3/4/5/6/7/8	No	Yes

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Table 2. Parameters of DPMZM1 and DPMZM2 setting table

FMF=4−p+q	DPMZM₁					DPMZM₂
FMF=4−p+q	Order=p−2	θ_m	V_DC	V_main	p	Order=2+q	θ_m	V_DC	V_main	q
2	−1	π/2	V_π	−V_π/2	+1	1	π/2	V_π	V_π/2	−1
3	0	π/4	0	−V_π/2	+2	3	π/2	V_π	−V_π/2	+1
4	−1	π/2	V_π	−V_π/2	+1	3	π/2	V_π	−V_π/2	+1
5	−1	π/2	V_π	−V_π/2	+1	4	π/4	0	−V_π/2	+2
6	−3	π/2	V_π	V_π/2	−1	3	π/2	V_π	−V_π/2	+1
7	−3	π/2	V_π	V_π/2	−1	4	π/4	0	−V_π/2	+2
8	−4	π/4	0	V_π/2	−2	4	π/4	0	−V_π/2	+2

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