TY - JOUR
T1 - Which is a more serious factor to the bandwidth of GI POF
T2 - Differential mode attenuation or mode coupling?
AU - Ishigure, Takaaki
AU - Kano, Mariko
AU - Koike, Yasuhiro
N1 - Funding Information:
Manuscript received January 20, 2000; revised April 14, 2000. This work is supported by the research fund of Plastic Optical Fiber Project from Telecommunications Advancement Organization (TAO) of Japan. The authors are with the Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan. They are also with the Kanagawa Academy of Science and Technology, Yokohama 236-0004, Japan. Publisher Item Identifier S 0733-8724(00)05763-7.
PY - 2000/7
Y1 - 2000/7
N2 - It is clarified for the first time that the effect of the mode coupling on the bandwidth characteristic is very small in the graded-index polymer optical fiber (GI POF) compared with in the step-index (SI) POF. Although there have been several trials regarding the theoretical prediction of bandwidth characteristics of the GI POF, a disagreement between measured and estimated properties was observed. The origin of disagreement has been generally explained as the mode coupling effect. However, it is clarified in this paper that the effect of the differential mode attenuation is the dominant factor of disagreement between measured and predicted bandwidth characteristics, while the effect of the mode coupling is small. In order to clarify the reason why the calculated bandwidth characteristics of the GI POF show a disagreement with that measured, differential mode delay and differential mode attenuation were investigated. It was found that the highest order mode in the poly methyl methacrylate (PMMA) base GI POF attenuated 17 dB compared with the lowest order mode through 100-m transmission. By taking into account this differential mode attenuation, an excellent agreement is observed between calculated and measured results of both the bandwidth characteristics and group delay, in which no mode coupling was considered.
AB - It is clarified for the first time that the effect of the mode coupling on the bandwidth characteristic is very small in the graded-index polymer optical fiber (GI POF) compared with in the step-index (SI) POF. Although there have been several trials regarding the theoretical prediction of bandwidth characteristics of the GI POF, a disagreement between measured and estimated properties was observed. The origin of disagreement has been generally explained as the mode coupling effect. However, it is clarified in this paper that the effect of the differential mode attenuation is the dominant factor of disagreement between measured and predicted bandwidth characteristics, while the effect of the mode coupling is small. In order to clarify the reason why the calculated bandwidth characteristics of the GI POF show a disagreement with that measured, differential mode delay and differential mode attenuation were investigated. It was found that the highest order mode in the poly methyl methacrylate (PMMA) base GI POF attenuated 17 dB compared with the lowest order mode through 100-m transmission. By taking into account this differential mode attenuation, an excellent agreement is observed between calculated and measured results of both the bandwidth characteristics and group delay, in which no mode coupling was considered.
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U2 - 10.1109/50.850741
DO - 10.1109/50.850741
M3 - Article
AN - SCOPUS:0034225841
SN - 0733-8724
VL - 18
SP - 959
EP - 965
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 7
ER -