Design of Low Crosstalk Double Coupling Ring Assisted 6-LP Fiber

Hongfei Zang; Feng Tian; Yongjun Wang

doi:10.3788/CJL202249.0306002

Chinese Journal of Lasers, Volume. 49, Issue 3, 0306002(2022)

Design of Low Crosstalk Double Coupling Ring Assisted 6-LP Fiber

Hongfei Zang¹, Feng Tian^2、*, and Yongjun Wang²

¹State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

²Beijing Key Laboratory of Space-Round Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China

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Figures & Tables(15)

Fig. 1. V of 6-LP modes in step fiber versus b

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$Simulated results of 6-LP modes in step fiber. (a) Effective mode refractive index versus working wavelength; (b) effective mode field area versus working wavelength$

Fig. 2. Simulated results of 6-LP modes in step fiber. (a) Effective mode refractive index versus working wavelength; (b) effective mode field area versus working wavelength

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Fig. 3. Mode field distributions in double coupling ring assisted few-mode fiber. (a) LP₂₁ mode field distribution; (b) LP₀₂ mode field distribution; (c) LP₃₁ mode field distribution; (d) overlapping diagram of LP₀₂ mode field and auxiliary structure of double coupling ring

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$Schematic of refractive index distribution in auxiliary structure of double coupling ring$

Fig. 4. Schematic of refractive index distribution in auxiliary structure of double coupling ring

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$Influences of inner circle radius of high refractive index coupling ring on effective mode refractive index and effective mode field area of LP01$

Fig. 5. Influences of inner circle radius of high refractive index coupling ring on effective mode refractive index and effective mode field area of LP₀₁

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$Influences of low refractive index coupling ring on effective mode refractive index and effective mode field area of LP01$

Fig. 6. Influences of low refractive index coupling ring on effective mode refractive index and effective mode field area of LP₀₁

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$Influences of width of low refractive index coupling ring on effective mode refractive index and effective mode field area of LP01$

Fig. 7. Influences of width of low refractive index coupling ring on effective mode refractive index and effective mode field area of LP₀₁

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$Influences of refractive index of high refractive index coupling ring on effective mode refractive index and effective mode field area of LP01$

Fig. 8. Influences of refractive index of high refractive index coupling ring on effective mode refractive index and effective mode field area of LP₀₁

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$Influences of width of high refractive index coupling ring on effective mode refractive index and effective mode field area$

Fig. 9. Influences of width of high refractive index coupling ring on effective mode refractive index and effective mode field area

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Fig. 10. Bending loss of LP₀₁ versus working wavelength

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Fig. 11. Bending loss of LP₁₂ mode versus bending radius

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$Comparison of effective refractive indexes of LP21 and LP02 modes in ordinary step structure and double coupling ring structure$

Fig. 12. Comparison of effective refractive indexes of LP₂₁ and LP₀₂ modes in ordinary step structure and double coupling ring structure

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Table 1. Structural parameters of 6-LP few-mode fiber
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Table 1. Structural parameters of 6-LP few-mode fiber
Parameter a /μm Δn₁/% w /μm a_clading/μm Δn_t/% n_cl
Value 8.3 0.82 4.15 80 -0.7 1.444

Table 2. Structural parameters of designed double coupling ring assisted 6-LP few-mode fiber
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Table 2. Structural parameters of designed double coupling ring assisted 6-LP few-mode fiber
Parameter a /μm Δn₁/% R_{in_ring}/μm w_＋/μm Δn_＋/% w_-/μm Δn_-/%
Value 8.3 0.8 3.5 2 0.25 1.5 -0.2

Table 3. Performance parameters of double coupling ring assisted 6-LP few-mode fiber at 1550 nm wavelength

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Table 3. Performance parameters of double coupling ring assisted 6-LP few-mode fiber at 1550 nm wavelength

Performance parameter	LP₀₁	LP₁₁	LP₂₁	LP₀₂	LP₃₁	LP₁₂
n_eff	1.4540	1.4522	1.4497	1.4482	1.4464	1.4446
A_eff/μm²	129	161	184	176	193	183
Differential mode delay /(ps·m^-1)	-	4.9	11.2	13.1	18.5	21.4
Dispersion /(ps·nm^-1·km^-1)	2.9	7.9	13.4	13.9	18.8	14.7
Minimum value of \|Δn_eff\|	1.5×10^-3@LP₂₁ and LP₀₂

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Hongfei Zang, Feng Tian, Yongjun Wang. Design of Low Crosstalk Double Coupling Ring Assisted 6-LP Fiber[J]. Chinese Journal of Lasers, 2022, 49(3): 0306002

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Paper Information

Category: fiber optics and optical communications

Received: Apr. 13, 2021

Accepted: Jun. 8, 2021

Published Online: Jan. 18, 2022

The Author Email: Tian Feng (tianfeng@bupt.edu.cn)

DOI:10.3788/CJL202249.0306002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Structural parameters of 6-LP few-mode fiber

Table 1. Structural parameters of 6-LP few-mode fiber

Table 2. Structural parameters of designed double coupling ring assisted 6-LP few-mode fiber

Table 2. Structural parameters of designed double coupling ring assisted 6-LP few-mode fiber

Table 3. Performance parameters of double coupling ring assisted 6-LP few-mode fiber at 1550 nm wavelength

Table 3. Performance parameters of double coupling ring assisted 6-LP few-mode fiber at 1550 nm wavelength