Polymer Spot Size Converter Supporting Multi-Orbital-Angular-Momentum-Modes

Sichen Lei; Kouer Yan; Pengfei Wu; Jiao Wang; Zhenkun Tan; Xiaopeng Yang

doi:10.3788/AOS240828

Acta Optica Sinica, Volume. 44, Issue 13, 1306008(2024)

Polymer Spot Size Converter Supporting Multi-Orbital-Angular-Momentum-Modes

Sichen Lei^1,4, Kouer Yan¹, Pengfei Wu^1,4、*, Jiao Wang², Zhenkun Tan³, and Xiaopeng Yang¹

Author Affiliations

¹School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, Shaanxi , China

²School of Electronic Information and Artificial Intelligence, Shaanxi University of Science & Technology, Xi’an 710021, Shaanxi , China

³School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710021, Shaanxi , China

⁴Xi’an Key Laboratory of Wireless Optical Communication and Network Research, Xi’an 710048, Shaanxi , China

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Figures & Tables(9)

Fig. 1. Intensity and phase evolution of synthetic OAM mode

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Fig. 2. Schematic diagrams of spot size converter. (a) Three-dimensional structure; (b) front view

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Fig. 3. Coupling efficiency varying with number of sides of a regular polygon cone for different d₁

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Fig. 4. Mode field distribution of x-z cross-section

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Fig. 5. Input-output y-z cross-sectional intensity and phase distributions of spot size converter

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Fig. 6. Waist radii of input and output optical fields and output mode purity under different topological charges

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Fig. 7. Alignment tolerance analysis. (a) Horizontal alignment tolerance of coupler under different modes; (b) vertical alignment tolerance of coupler under different modes

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Table 1. Corresponding relationship between the excitation conditions of LP mode and OAM modes

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Table 1. Corresponding relationship between the excitation conditions of LP mode and OAM modes

LP mode	V	U	W	OAM mode
LP₁₁	2.405-5.520	2.405-3.211	0.683-4.467	$O A M_{\pm 1} i s e q u a l t o L P_{11}^{e v e n} \pm i L P_{11}^{o d d}$
LP₂₁	3.832-7.016	3.832-4.455	0.727-5.399	$O A M_{\pm 2} i s e q u a l t o L P_{21}^{e v e n} \pm i L P_{21}^{o d d}$
LP₃₁	5.136-8.417	5.136-5.658	0.816-6.208	$O A M_{\pm 3} i s e q u a l t o L P_{31}^{e v e n} \pm i L P_{31}^{o d d}$

Table 2. Corresponding table of coupling efficiency and mode purity under different device lengths and OAM modes

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Table 2. Corresponding table of coupling efficiency and mode purity under different device lengths and OAM modes

Length /μm	300			350			400			450
Mode	OAM_±1	OAM_±2	OAM_±3	OAM_±1	OAM_±2	OAM_±3	OAM_±1	OAM_±2	OAM_±3	OAM_±1	OAM_±2	OAM_±3
Coupling efficiency	0.891	0.875	0.823	0.886	0.875	0.817	0.886	0.875	0.812	0.888	0.875	0.806
Purity /%	96	98	97	95	99	97	94	99	97	93	99	98

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Sichen Lei, Kouer Yan, Pengfei Wu, Jiao Wang, Zhenkun Tan, Xiaopeng Yang. Polymer Spot Size Converter Supporting Multi-Orbital-Angular-Momentum-Modes[J]. Acta Optica Sinica, 2024, 44(13): 1306008

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Apr. 9, 2024

Accepted: May. 15, 2024

Published Online: Jul. 17, 2024

The Author Email: Wu Pengfei (wupengf@xaut.edu.cn)

DOI:10.3788/AOS240828

CSTR:32393.14.AOS240828

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology