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Proceedings Paper

The design of fiber-based 4-LP mode multi/demultiplexer
Author(s): Huan Zhang; Jiajing Tu; Keping Long
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Paper Abstract

We propose a fiber-based 4-LP mode (LP01, LP11, LP21 and LP02) multi/demultiplexer, which excites or separates 4-LP mode simultaneously in the integrated structure of a single optical fiber. The structure contains a 4-mode transmitting core in the center of the fiber and the other three multi/demulitplexing parts (consist of a coupling core and several assistant cores or not) which are deployed around the transmitting core with 120 degrees between each other.

The design of the fiber-based 4-LP mode multi/demultiplexer includes the following parts. Firstly, the appropriate distance between the transmitting core and the surrounding parts are below 15μm, 12μm and 10μm for multi/demultiplexing of LP11, LP21 and LP02 mode, respectively, which can guarantee the coupling loss is less than 2%. Then we design the structural parameters (core diameter and refractive index) of single-mode coupling cores to achieve phase matching between LP01 (single-mode coupling cores) and LP11, LP21, LP02 (transmitting core), respectively. The appropriate core diameter and refractive index for the coupling cores of the multi/demultiplexing parts are 5μm and 1.465703 (LP01-LP11), 2μm and 1.479793 (LP01-LP21), 1.5μm and 1.488404 (LP01-LP02), respectively, all of which can ensure that the coupling efficiency are more than 90% in the C+L band. Afterwards, by discussing the coupling crosstalk of each multi/demultiplexing part, we find that LP02-LP01 mode multi/demultiplexing part does not need any assistant core, LP21-LP01 and LP11-LP01 mode multi/multiplexing parts need to add 1 or 2 assistant single mode core as required to decrease the coupling crosstalk. Finally by adjusting the relative position of the three multi/demultiplexing parts and the transmitting core (ensure the performance of the whole system is not affected), we can ensure that the 4 mode can be multi/demultiplexed at the same time.

Above all, we put forward a fiber-based 4-LP-mode multi/demultiplexer which excites or separates 4-LP mode simultaneously with high multi/demultiplexing efficiency, low coupling loss, and low coupling crosstalk.

Paper Details

Date Published: 28 February 2017
PDF: 7 pages
Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 102563M (28 February 2017); doi: 10.1117/12.2257833
Show Author Affiliations
Huan Zhang, Univ. of Science and Technology Beijing (China)
Jiajing Tu, Univ. of Science and Technology Beijing (China)
Keping Long, Univ. of Science and Technology Beijing (China)


Published in SPIE Proceedings Vol. 10256:
Second International Conference on Photonics and Optical Engineering
Chunmin Zhang; Anand Asundi, Editor(s)

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