Dual-Core Terahertz Fiber Directional Coupler

Fig. 2. Mode field distributions of four supermodes. (a) x-polarization odd supermode; (b) x-polarization even supermode; (c) y-polarization odd supermode; (d) y-polarization even supermode

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Fig. 3. Subwavelength dual-core coupler structure, and coupling length of x and y polarization modes as a function of R. (a) Subwavelength dual-core coupler structure; (b) coupling length of x and y polarization modes as a function of R

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Fig. 4. Variation of coupling length with core radius R. (a) R₂=3 mm; (b) t=20 μm

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Fig. 5. Insertion loss and polarization dependent loss of coupler as functions of frequency when δ=140 μm, t=20 μm, and R₂=3 mm. (a) Core A; (b) core B

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Fig. 6. Normalized power of core A and core B as a function of transmission distance when δ=140 μm, t=20 μm, and R₂=3 mm. (a) Power change curves of x-polarization mode in two cores; (b) power change curves of y-polarization mode in two cores

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Fig. 7. Relationship among K, t, and R. (a) Variation of K value with t under different R₂; (b) variation of K value with R under different t

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Fig. 8. Device loss of x and y polarization modes varies with t and R. (a) Device loss of x and y polarization modes varies with t at different R₂; (b) device loss of x and y polarization modes varies with core radius R at t=20 μm

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Table 1. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different t
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Table 1. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different t
t /μm L_c/cm $A_{loss}^{x}$ /(dB·cm^-1) $A_{loss}^{y}$ /(dB·cm^-1) $P_{loss}^{x}$ /dB $P_{loss}^{y}$ /dB
20 1.07 0.44 0.35 0.23 0.18
25 1.26 0.62 0.50 0.39 0.31
30 1.49 0.84 0.66 0.62 0.49

Table 2. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different R₂
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Table 2. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different R₂
R₂ /mm L_c /cm $A_{loss}^{x}$ /(dB·cm^-1) $A_{loss}^{y}$ /(dB·cm^-1) $P_{loss}^{x}$ /dB $P_{loss}^{y}$ /dB
2.2 1.18 0.52 0.43 0.30 0.25
2.6 1.11 0.47 0.39 0.26 0.21
3 1.07 0.44 0.35 0.23 0.18

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Xu Huang, Xingfang Luo, Xiangyu Zuo, Shaohua Wang, Yuanfeng Zhu. Dual-Core Terahertz Fiber Directional Coupler[J]. Acta Optica Sinica, 2022, 42(2): 0206006

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Aug. 17, 2021

Accepted: Oct. 8, 2021

Published Online: Jan. 19, 2022

The Author Email: Zhu Yuanfeng (yuanfengzhu@126.com)

DOI:10.3788/AOS202242.0206006

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Lc, Alossx, Alossy, Plossx, and Plossy of couplers at 1 THz for different t

Table 1. Lc, Alossx, Alossy, Plossx, and Plossy of couplers at 1 THz for different t

Table 2. Lc, Alossx, Alossy, Plossx, and Plossy of couplers at 1 THz for different R2

Table 2. Lc, Alossx, Alossy, Plossx, and Plossy of couplers at 1 THz for different R2

Table 1. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different t

Table 1. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different t

Table 2. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different R₂

Table 2. L_c, $A_{loss}^{x}$ , $A_{loss}^{y}$ , $P_{loss}^{x}$ , and $P_{loss}^{y}$ of couplers at 1 THz for different R₂