### Abstract

The developed directional coupler using polymer optical fiber performance is studied analytically where related theories are integrated and the outcomes are analyzed. Important theories such as simplified coupled mode theory and elliptical point contacts are integrated where the parameters such as coupling length, distance between the two fibers cores and forces are varied. Using simplified coupled mode theory, coupling coefficient and coupling efficiency is obtained based on the parameters of multimode fiber coupler such as the operating wavelength, numerical apertures, coupling length and diameter of the cores. The two fibers are initially tapered at certain length at most 20 mm and attached to geometrical blocks with certain radii and the middle tapered regions of the fibers are brought closed in proximity and they are lapped to each other. Investigation of different radii of the geometrical blocks represents the effect of macro-bending when the fibers are bent when attached to the circular blocks. This concept is used to transfer the modes from first fiber to the second. Then a particular amount of load force is exerted upon one side of the blocks so that the gap is closed and leads to increment of coupling length between the two fibers. The various load force amount will give different coupling lengths and distances between the two cores, thus leading to different coupling efficiencies. Analytically the expression that represents the coupling efficiency with force is an integrated expression from simplified coupled mode theory and Hertz's Law of elliptical point contacts. Optimized coupling efficiency obtained is as high as 70% for this study.

Original language | English |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |

Publisher | SPIE |

Volume | 9286 |

ISBN (Print) | 9781628413618 |

DOIs | |

Publication status | Published - 2014 |

Event | 2nd International Conference on Applications of Optics and Photonics - Aveiro Duration: 26 May 2014 → 30 May 2014 |

### Other

Other | 2nd International Conference on Applications of Optics and Photonics |
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City | Aveiro |

Period | 26/5/14 → 30/5/14 |

### Fingerprint

### Keywords

- Circular blocks
- Coupled mode theory
- Coupling efficiency
- Elliptical blocks
- Elliptical point contacts
- Force
- Macrobending
- Multimode directional coupler

### ASJC Scopus subject areas

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

### Cite this

*Proceedings of SPIE - The International Society for Optical Engineering*(Vol. 9286). [92863K] SPIE. https://doi.org/10.1117/12.2063541

**Characteristics study of multimode directional coupler by elliptical point contacts and CMT.** / Supian, L. S.; Ramza, Harry; Ab Rahman, Mohd Syuhaimi; Arsad, Norhana.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings of SPIE - The International Society for Optical Engineering.*vol. 9286, 92863K, SPIE, 2nd International Conference on Applications of Optics and Photonics, Aveiro, 26/5/14. https://doi.org/10.1117/12.2063541

}

TY - GEN

T1 - Characteristics study of multimode directional coupler by elliptical point contacts and CMT

AU - Supian, L. S.

AU - Ramza, Harry

AU - Ab Rahman, Mohd Syuhaimi

AU - Arsad, Norhana

PY - 2014

Y1 - 2014

N2 - The developed directional coupler using polymer optical fiber performance is studied analytically where related theories are integrated and the outcomes are analyzed. Important theories such as simplified coupled mode theory and elliptical point contacts are integrated where the parameters such as coupling length, distance between the two fibers cores and forces are varied. Using simplified coupled mode theory, coupling coefficient and coupling efficiency is obtained based on the parameters of multimode fiber coupler such as the operating wavelength, numerical apertures, coupling length and diameter of the cores. The two fibers are initially tapered at certain length at most 20 mm and attached to geometrical blocks with certain radii and the middle tapered regions of the fibers are brought closed in proximity and they are lapped to each other. Investigation of different radii of the geometrical blocks represents the effect of macro-bending when the fibers are bent when attached to the circular blocks. This concept is used to transfer the modes from first fiber to the second. Then a particular amount of load force is exerted upon one side of the blocks so that the gap is closed and leads to increment of coupling length between the two fibers. The various load force amount will give different coupling lengths and distances between the two cores, thus leading to different coupling efficiencies. Analytically the expression that represents the coupling efficiency with force is an integrated expression from simplified coupled mode theory and Hertz's Law of elliptical point contacts. Optimized coupling efficiency obtained is as high as 70% for this study.

AB - The developed directional coupler using polymer optical fiber performance is studied analytically where related theories are integrated and the outcomes are analyzed. Important theories such as simplified coupled mode theory and elliptical point contacts are integrated where the parameters such as coupling length, distance between the two fibers cores and forces are varied. Using simplified coupled mode theory, coupling coefficient and coupling efficiency is obtained based on the parameters of multimode fiber coupler such as the operating wavelength, numerical apertures, coupling length and diameter of the cores. The two fibers are initially tapered at certain length at most 20 mm and attached to geometrical blocks with certain radii and the middle tapered regions of the fibers are brought closed in proximity and they are lapped to each other. Investigation of different radii of the geometrical blocks represents the effect of macro-bending when the fibers are bent when attached to the circular blocks. This concept is used to transfer the modes from first fiber to the second. Then a particular amount of load force is exerted upon one side of the blocks so that the gap is closed and leads to increment of coupling length between the two fibers. The various load force amount will give different coupling lengths and distances between the two cores, thus leading to different coupling efficiencies. Analytically the expression that represents the coupling efficiency with force is an integrated expression from simplified coupled mode theory and Hertz's Law of elliptical point contacts. Optimized coupling efficiency obtained is as high as 70% for this study.

KW - Circular blocks

KW - Coupled mode theory

KW - Coupling efficiency

KW - Elliptical blocks

KW - Elliptical point contacts

KW - Force

KW - Macrobending

KW - Multimode directional coupler

UR - http://www.scopus.com/inward/record.url?scp=84922738935&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922738935&partnerID=8YFLogxK

U2 - 10.1117/12.2063541

DO - 10.1117/12.2063541

M3 - Conference contribution

AN - SCOPUS:84922738935

SN - 9781628413618

VL - 9286

BT - Proceedings of SPIE - The International Society for Optical Engineering

PB - SPIE

ER -