プラスティック光ファイバーの不56306;57123;一性ならびに受光器の配置が測定特性に及ぼす影響

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  • Inhomogeneity of Plastic Optical Fiber and Effects of Photodiode Position on Measured Characteristics
  • プラスティック ヒカリ ファイバー ノ フキンイツセイ ナラビニ ジュコウキ ノ ハイチ ガ ソクテイ トクセイ ニ オヨボス エイキョウ

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Near field patterns(NFPs) of a plastic optical fiber (POF) are studied in this paper. NFPs are found to be inhomogeneous across the cross section of the POF and vary irregularly over short POF distances. They also vary when light incident angles are varied. The irregularity and inhomogeneity are found to come not from the irregularity of the POF end surfaces but from the POF bulk property. They are also found to affect the far field pattern(FFP),which in turn affects the impulse response waveform and frequency transfer characteristics of the POF. The use of a photodiode in combination with a POF of a large diameter and large numerical aperture is also studied in this paper. Frequency transfer function of a POF can be measured precisely only when all of the exiting lights from the POF are received at a photodiode(PD). Such a condition is not met for the POF under consideration. POFs of 35m and 10m in length and with light incident at zero degree both show the best frequency characteristics when the distance between the POF end surface and the APD is the largest as we have expected. However,POF of 10m in length and light incident at 25 degrees shows the best frequency characteristics when the distance is small. Both characteristics are discussed in terms of varying angle distributions of the light that the APD can accept with the varying distances.

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