Residual stress change of optical fiber for Ge dopant variation

Jae Ho Lee; Sung Koog Oh

doi:10.1117/12.520433

30 April 2004 Residual stress change of optical fiber for Ge dopant variation

Jae Ho Lee, Sung Koog Oh

Proceedings Volume 5279, Optical Fibers and Passive Components; (2004) https://doi.org/10.1117/12.520433
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

Abstract

As GeO₂ concentration increased, residual stress increased. For the same tension, axial stress induced by drawing is linearly proportional to GeO₂-dopant concentration. The residual stress of the fiber (about axial direction) is originated from phase distribution caused by photo-elastic effect: A phenomena that a fiber becomes birefringent through the nonisotropic stresses. The photo-elastic effect makes phase shift such that intensity difference of light is appeared. The phase profile is obtained by measuring the intensity difference. And phase profile can be converted to the stress profile by Abel transformation. The magnitude of stress induced by drawing tension, is different as glass material constitution. As material is the more viscous, induces the more stress. Generally the glass for which dopants such as Ge, B, P and F are added has lower viscosity value compared with pure silica glass. And as dopant concentration increased, viscosity decreased. We investigated the relation between GeO₂-dopant concentration and the magnitude of residual stress. Perform core was deposited with Ge-Si ratio having parabolic increment about radial direction. GeO₂ concentration of core varied from 0 to 21.67mol%. That was also described to index change. The index difference (delta N) of core and clad was 0.026. The preform was drawn for fixed tension. Residual stress of optical fiber was measured after drawing. And fiber was fully annealed by flame. After then stress was measured one more. We obtained stress as the difference these two data: before and after anneal process. In fiber drawing process, tension was differently applied for each point of core region so that the measured stress about radial direction was not correct. To compensate the error, stress of sample was referred to pure-silica rod of that.

Citation Download Citation

Jae Ho Lee and Sung Koog Oh "Residual stress change of optical fiber for Ge dopant variation", Proc. SPIE 5279, Optical Fibers and Passive Components, (30 April 2004); https://doi.org/10.1117/12.520433

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available