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Integrated Optics|5 Article(s)
Research on Designing Approaches for Device and Integration of Photonic Integrated Interferometric Detecting System
Hongjie DING, Peng LIU, Yong LIU, Hong CHANG, Shouqian CHEN, and Wang ZHANG
Based on the wave effect of light wave， the optical path matching waveguides， array waveguide gratings， phase modulators and multimode interference couplers are designed by using the beam propagation method. On this basis， the coupling characteristics of the photonic integrated device are analyzed and calculated， and a complete photonic integrated chip is designed. Through the analysis， research and optimization of each module of the photonic integrated interferometry system， an electronic prototype of the photonic integrated interferometry detection system is designed. The results show that the minimum loss of the designed photonic integrated device is 0.07 dB， and the loss of the photonic integrated chip is 7.46 dB. When the equivalent aperture is 110 mm and the system height aperture ratio is 1∶4， the electronic prototype of the photonic integrated interference detection system has the technical indexes of 0.5 ° field of view and 5 m spatial resolution at 100 km. Based on the wave effect of light wave， the optical path matching waveguides， array waveguide gratings， phase modulators and multimode interference couplers are designed by using the beam propagation method. On this basis， the coupling characteristics of the photonic integrated device are analyzed and calculated， and a complete photonic integrated chip is designed. Through the analysis， research and optimization of each module of the photonic integrated interferometry system， an electronic prototype of the photonic integrated interferometry detection system is designed. The results show that the minimum loss of the designed photonic integrated device is 0.07 dB， and the loss of the photonic integrated chip is 7.46 dB. When the equivalent aperture is 110 mm and the system height aperture ratio is 1∶4， the electronic prototype of the photonic integrated interference detection system has the technical indexes of 0.5 ° field of view and 5 m spatial resolution at 100 km.
Acta Photonica Sinica
- Publication Date: May. 25, 2021
- Vol. 50, Issue 5, 43 (2021)
Integrated Optical Chip Based on Y-branch and Bragg Grating Structure
Xiaojie YIN, Zhiyuan ZHENG, Xingzhuang ZI, and Mingju CHAO
A 1×8 optical splitter integrated chip with channel monitoring function was fabricated by integrating Y-branch with deep etched Bragg grating structure. The integrated optical chip after coupling and packaging realizes stable optical signal transmission and monitoring function at the same time in the channel. The central wavelength range of 8-channel reflectance spectrum of the integrated optical chip is 1 597 nm~1 639 nm， with an interval of 6 nm. The maximum of 3 dB bandwidth is 0.67 nm， and the minimum of channel reflectance is 88.24%. The average insertion loss of 8 channels is 11.92 dB and the output uniformity is 0.19 dB in the wavelength of 1 550 nm. The integrated optical chip designed and fabricated in this study has simple structure and high integration， which can be widely used in the construction of fiber to home and other optical network transmission， and realize the function of real-time monitoring of network link status. A 1×8 optical splitter integrated chip with channel monitoring function was fabricated by integrating Y-branch with deep etched Bragg grating structure. The integrated optical chip after coupling and packaging realizes stable optical signal transmission and monitoring function at the same time in the channel. The central wavelength range of 8-channel reflectance spectrum of the integrated optical chip is 1 597 nm~1 639 nm， with an interval of 6 nm. The maximum of 3 dB bandwidth is 0.67 nm， and the minimum of channel reflectance is 88.24%. The average insertion loss of 8 channels is 11.92 dB and the output uniformity is 0.19 dB in the wavelength of 1 550 nm. The integrated optical chip designed and fabricated in this study has simple structure and high integration， which can be widely used in the construction of fiber to home and other optical network transmission， and realize the function of real-time monitoring of network link status.
Acta Photonica Sinica
- Publication Date: May. 25, 2021
- Vol. 50, Issue 5, 53 (2021)
Design and Implementation of Integrated Optical Waveguide DC Electric Field Sensor
Jianxin ZHANG, Jiahong ZHANG, and Fushen CHEN
To solve the problem that the integrated optical waveguide electric field sensor can not directly respond to the DC electric field， based on the basic principle of the field milling electric field sensor， a DC electric field sensor composed of a DC motor， a shield electrode， an integrated optical waveguide Mach-Zehnder Interferometer （MZI）， and an induction electrode is designed. Its volume is 87.5 mm×58.5 mm×17.5 mm. The working principle of the integrated optical waveguide DC electric field sensor is derived and a three-dimensional simulation model of the sensor is constructed using the COMSOL software. The simulation results show that the electric field intensity on the sensing electrode changes periodically with the rotation of the shielding electrode. A DC electric field experimental measurement system is established to test the dynamic range of the integrated optical waveguide DC electric field sensor. The results show that the minimum measurable electric field of the sensor is 5 kV/m， the maximum measurable electric field is greater than 140 kV/m， and the linear correlation coefficient is 0.995 1， which is suitable for DC electric field measurement. To solve the problem that the integrated optical waveguide electric field sensor can not directly respond to the DC electric field， based on the basic principle of the field milling electric field sensor， a DC electric field sensor composed of a DC motor， a shield electrode， an integrated optical waveguide Mach-Zehnder Interferometer （MZI）， and an induction electrode is designed. Its volume is 87.5 mm×58.5 mm×17.5 mm. The working principle of the integrated optical waveguide DC electric field sensor is derived and a three-dimensional simulation model of the sensor is constructed using the COMSOL software. The simulation results show that the electric field intensity on the sensing electrode changes periodically with the rotation of the shielding electrode. A DC electric field experimental measurement system is established to test the dynamic range of the integrated optical waveguide DC electric field sensor. The results show that the minimum measurable electric field of the sensor is 5 kV/m， the maximum measurable electric field is greater than 140 kV/m， and the linear correlation coefficient is 0.995 1， which is suitable for DC electric field measurement.
Acta Photonica Sinica
- Publication Date: May. 25, 2021
- Vol. 50, Issue 5, 59 (2021)
Precision Measurement and Theoretical Analysis of SOI Waveguide Transmission Loss and Butt-coupling Loss
Ting YU, Zhuo CHEN, Tiancheng LI, and Degui SUN
The method of Fabry-Perot resonant cavity （also called F-P cavity） is exploited to measure the optical transmission loss of SOI waveguides and the fiber-chip butt-coupling loss， with which three SOI waveguide channels having the same size and a length of 8.37 mm are measured. Then， the average value of SOI waveguide optical transmission loss/butt-coupling loss and the measurement accuracies are obtained， and the standard deviation of the measurements is very small. Another SOI waveguide with a length of 12.5 mm is measured using an automatic temperature control scanner and both the transmission losses and the butt-coupling losses of three repeated measurements are the same as one another， implying the stable measuring accuracies of F-P cavity method. The dual dependences of the measurement accuracy da/a of SOI waveguide transmission loss on the relative error dtM/tM of F-P cavity output extinction ratio and the relative error dR/R of the Fresnel reflection coefficient of SOI waveguide end-face are theoretically modelled. The simulation results show that the changes of SOI waveguide refractive index， the upper/lower cladding layers and core layer have no impacts upon the measurement accuracies of both the optical transmission loss and the fiber-chip coupling loss.The numerical simulation results are consistent with the experimental results. The method of Fabry-Perot resonant cavity （also called F-P cavity） is exploited to measure the optical transmission loss of SOI waveguides and the fiber-chip butt-coupling loss， with which three SOI waveguide channels having the same size and a length of 8.37 mm are measured. Then， the average value of SOI waveguide optical transmission loss/butt-coupling loss and the measurement accuracies are obtained， and the standard deviation of the measurements is very small. Another SOI waveguide with a length of 12.5 mm is measured using an automatic temperature control scanner and both the transmission losses and the butt-coupling losses of three repeated measurements are the same as one another， implying the stable measuring accuracies of F-P cavity method. The dual dependences of the measurement accuracy da/a of SOI waveguide transmission loss on the relative error dtM/tM of F-P cavity output extinction ratio and the relative error dR/R of the Fresnel reflection coefficient of SOI waveguide end-face are theoretically modelled. The simulation results show that the changes of SOI waveguide refractive index， the upper/lower cladding layers and core layer have no impacts upon the measurement accuracies of both the optical transmission loss and the fiber-chip coupling loss.The numerical simulation results are consistent with the experimental results.
Acta Photonica Sinica
- Publication Date: Jul. 25, 2021
- Vol. 50, Issue 7, 268 (2021)
Design of a Reconfigurable Optical Filter Based on Triple-ring-assisted Mach-Zenhnder Interferometer with Large Bandwidth Tuning Capability
Jia JIANG, Minming GENG, Qiang LIU, and Zhenrong ZHANG
A compact reconfigurable optical filter based on silicon-on-insulator with large bandwidth tuning capability is designed in this paper. The device is based on triple-ring-assisted Mach-Zehnder interferometer. The bandwidth and center wavelength of the device can be tuned at the same time by reasonably changing the phases of the microring resonators through the thermo-optic effect of silicon. The performance of the proposed device is simulated by finite difference time domain method. The simulation results show that the tuning range of the bandwidth is 1.4 nm to 10.6 nm， which accounts for 11.5% to 85% of the free spectrum range. The stopband extinction ratio is greater than 20 dB， and the passband loss is 0.4 dB to 0.7 dB， the footprint of the device is about 40 μm×60 μm. A compact reconfigurable optical filter based on silicon-on-insulator with large bandwidth tuning capability is designed in this paper. The device is based on triple-ring-assisted Mach-Zehnder interferometer. The bandwidth and center wavelength of the device can be tuned at the same time by reasonably changing the phases of the microring resonators through the thermo-optic effect of silicon. The performance of the proposed device is simulated by finite difference time domain method. The simulation results show that the tuning range of the bandwidth is 1.4 nm to 10.6 nm， which accounts for 11.5% to 85% of the free spectrum range. The stopband extinction ratio is greater than 20 dB， and the passband loss is 0.4 dB to 0.7 dB， the footprint of the device is about 40 μm×60 μm.
Acta Photonica Sinica
- Publication Date: Jul. 25, 2021
- Vol. 50, Issue 7, 275 (2021)
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