Disturbance Orbital Angular Momentum Spectrum Recognition Based on ResNeXt Network

Qiong Wu; Haiying Li; Wei Ding; Lu Bai; Zhensen Wu

doi:10.3788/CJL202148.1706003

Chinese Journal of Lasers, Volume. 48, Issue 17, 1706003(2021)

Disturbance Orbital Angular Momentum Spectrum Recognition Based on ResNeXt Network

Qiong Wu, Haiying Li^*, Wei Ding, Lu Bai, and Zhensen Wu

Author Affiliations

School of Physics and Optoelectronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(8)

Fig. 1. Schematic diagram of experimental device for generating high-order Bessel beam based on spiral phase plate method

Download full size

Fig. 2. Intensity diagram of 0-order, 1st-order, 8th-order Bessel beam

Download full size

Fig. 3. Intensity distribution diagram of transmission field of the eighth-order Bessel beam passing through the glass medium at the incident angles of 0°,10°, 20°, 30°, 40°, respectively

Download full size

Fig. 4. Comparison of OAM spectrum recognition value and numerical result. (a)--(e) θ=0°, 10°, 20°, 30°, 40°

Download full size

Table 1. OAM spectrum identification process of Bessel beam transmission field based on ResNeXt network

View table

Table 1. OAM spectrum identification process of Bessel beam transmission field based on ResNeXt network

Layer	Type	Detail
1	Input	Input is typically 64×64 grayscale image
2	2D Convolution	Eight 3×3 filters with stride 1, padding “same”
3	Batch normalization
4	Rectified linear units
5	Max pooling	2×2 max pooling with stride 2
6	2D Convolution	Eight channels, 163×3 filters, stride 1, padding “same”
7	Batch normalization
8	Rectified linear units
9	Max pooling	2×2 max pooling with stride 2
10	2D Convolution	16 channels, 323×3 filters, stride 1, padding “same”
11	Batch normalization
12	Rectified linear units
13	Fully connected	8912 inputs and 9 outputs
14	Softmax
15	Classification with OAM spectrumdistribution prediction	9 classes with cross-entropy loss function, smooth L1 loss, f(l)

Table 2. OAM spectrum distribution of Bessel beam transmission field

View table

Table 2. OAM spectrum distribution of Bessel beam transmission field

Incident angle	l=4	l=5	l=6	l=7	l=8	l=9	l=10	l=11	l=12
θ=0°			7.80×10^-6	4.04×10^-4	0.9989	3.92×10^-4	7.75×10^-6
θ=10°			0.007	0.002	0.9822	0.0017	0.0066
θ=20°			0.1073	0.0066	0.7703	0.006	0.1013
θ=30°	0.0757	0.0073	0.3301	0.0089	0.1684	0.0085	0.3120	0.0065	0.0662
θ=40°	0.2198	0.0111	0.0574	0.0071	0.1020	0.0068	0.0577	0.01	0.2177

Table 3. Fitting function parameters under different incident angles
View table
Table 3. Fitting function parameters under different incident angles
Incidentangle a₀ a₁ b₁ w
θ=0° 0.3331 -0.3339 -0.576 2.094
θ=10° 0.3297 -0.3129 -0.5725 2.097
θ=20° 0.2819 0.042 -0.4866 2.17
θ=30° 0.1249 0.0003072 -0.1093 1.768
θ=40° 0.0722 -0.0509 -0.0211 2.403

Table 4. Comparison of measured values and numerical calculation results of the eighth-order Bessel beam main mode
View table
Table 4. Comparison of measured values and numerical calculation results of the eighth-order Bessel beam main mode
Incident angle θ=0° θ=10° θ=20° θ=30° θ=40°
ResNeXt 0.9999 0.9619 0.7420 0.1299 0.0961
Numerical result 0.9989 0.9818 0.7660 0.1684 0.1020
Relative error /% 0.10 -2.03 -3.13 -22.86 -5.78

Tools

Get Citation

Copy Citation Text

Qiong Wu, Haiying Li, Wei Ding, Lu Bai, Zhensen Wu. Disturbance Orbital Angular Momentum Spectrum Recognition Based on ResNeXt Network[J]. Chinese Journal of Lasers, 2021, 48(17): 1706003

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites

Paper Information

Category: fiber optics and optical communications

Received: Jan. 15, 2021

Accepted: Mar. 9, 2021

Published Online: Sep. 1, 2021

The Author Email: Haiying Li (lihy@xidian.edu.cn)

DOI:10.3788/CJL202148.1706003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. OAM spectrum identification process of Bessel beam transmission field based on ResNeXt network

Table 1. OAM spectrum identification process of Bessel beam transmission field based on ResNeXt network

Table 2. OAM spectrum distribution of Bessel beam transmission field

Table 2. OAM spectrum distribution of Bessel beam transmission field

Table 3. Fitting function parameters under different incident angles

Table 3. Fitting function parameters under different incident angles

Table 4. Comparison of measured values and numerical calculation results of the eighth-order Bessel beam main mode

Table 4. Comparison of measured values and numerical calculation results of the eighth-order Bessel beam main mode