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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


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.

Original languageEnglish
Title of host publicationOptical Design and Testing VI
EditorsChunlei Du, Jose Sasian, Yongtian Wang, Kimio Tatsuno
ISBN (Electronic)9781628413458
Publication statusPublished - 2014 Jan 1
EventOptical Design and Testing VI - Beijing, China
Duration: 2014 Oct 92014 Oct 10

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOptical Design and Testing VI

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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