Study on fused biconical taper broadband couplers

ZHOU Mengwei; REN Siyuan; ZHU Yiqing; YAO Xiaotian

doi:10.7510/jgjs.issn.1001-3806.2019.06.005

LASER TECHNOLOGY > 2019 > 43(6): 757-762. > DOI: 10.7510/jgjs.issn.1001-3806.2019.06.005

ZHOU Mengwei, REN Siyuan, ZHU Yiqing, YAO Xiaotian. Study on fused biconical taper broadband couplers[J]. LASER TECHNOLOGY, 2019, 43(6): 757-762. DOI: 10.7510/jgjs.issn.1001-3806.2019.06.005

Citation:

ZHOU Mengwei, REN Siyuan, ZHU Yiqing, YAO Xiaotian. Study on fused biconical taper broadband couplers[J]. LASER TECHNOLOGY, 2019, 43(6): 757-762. DOI: 10.7510/jgjs.issn.1001-3806.2019.06.005

Citation:

ZHOU Mengwei, REN Siyuan, ZHU Yiqing, YAO Xiaotian. Study on fused biconical taper broadband couplers[J]. LASER TECHNOLOGY, 2019, 43(6): 757-762. DOI: 10.7510/jgjs.issn.1001-3806.2019.06.005

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Study on fused biconical taper broadband couplers

1.
College of Science, Jiangnan University, Wuxi 214122, China
2.
College of Precision Instrument and Opti-electronics Engineering, Tianjin University, Tianjin 300129, China
3.
Suzhou Optoring Co.Ltd., Suzhou 215123, China

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Received Date: December 07, 2018
Revised Date: December 23, 2018
Published Date: November 24, 2019

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Abstract

Abstract

To explore characteristics of asymmetric couplers, a broadband coupler was fabricated by using two optical fibers with different refractive index. The distribution of optical field of fiber couplers with different refractive index differences and the curve of output optical power with stretching length were simulated by numerical calculation. Bandwidth difference between two broadband couplers and the influence of melting degree on power conversion ratio were analyzed. The theoretical bandwidth was obtained by simulation based on the beam propagation method. The results show that, the coupling power conversion ratio varies with the asymmetry of two optical fibers. When the power conversion ratio is adjusted to the splitting ratio of the coupler, the bandwidth of the coupler is the widest. The melting degree can regulate the beam splitting ratio of broadband couplers. The wavelength response of 3dB fiber coupler in C+L band is gentle. The bandwidth range is 150nm. The bandwidth ranges of couplers with beam splitting ratios of 3:7 and 1:9 are 210nm and 330nm, respectively. The bandwidth range of the coupler with beam splitting ratio of 1:99 is 420nm. The results provide a reference for the fabrication of asymmetric broadband couplers.
- fiber optics,
- broadband coupler,
- beam propagation method,
- refractive index difference,
- asymmetric

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