Optical performance study of duplex Y-branch coupler with different structures

Kuang-Lung Huang; Te-Shu Liu; Jei Ding; Jin-Jia Chen

doi:10.1117/12.2070945

5 November 2014 Optical performance study of duplex Y-branch coupler with different structures

Kuang-Lung Huang, Te-Shu Liu, Jei Ding, Jin-Jia Chen

Proceedings Volume 9272, Optical Design and Testing VI; 92720Y (2014) https://doi.org/10.1117/12.2070945
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

As the increase of environment and conservation consciousness in recent years, green-lighting concept begins attracting much attention of the people in our country; particularly, the exploration of daylight lighting system is an obvious example. However, in this nature-light lighting system, versatile optical couplers are required to guide and dissipate sunlight into different indoor spaces to produce assistant illumination, and their coupling efficiencies directly affect the whole efficiency of the lighting system. Thus, they play an important role in the daylight lighting system. To obtain high efficient optical couplers, this thesis, other than investigating various used Y-branch couplers, proposes another new type of coupler, which has a positive- or negative-arc Y-branch structure to split a light-beam into two beams or to combine two light-beams into one beam with high efficient light output. From optical simulation results, it can be seen that the output efficiency of this symmetrical Y-branch coupler with positive or negative arc can reach above 90%, no matter it is used as a combiner or splitter. Furthermore, this thesis also goes through an investigation of the Y-branch output field distribution and an improved arc design; the coupling efficiency between the coupler and an externally connected optical fiber can be promoted.

Citation Download Citation

Kuang-Lung Huang, Te-Shu Liu, Jei Ding, and Jin-Jia Chen "Optical performance study of duplex Y-branch coupler with different structures", Proc. SPIE 9272, Optical Design and Testing VI, 92720Y (5 November 2014); https://doi.org/10.1117/12.2070945

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KEYWORDS

Beam splitters

Light sources and illumination

Phase only filters

Structured optical fibers

Interfaces

Light sources

Optical simulations

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