Presentations

A lot of research interests are forcused on the introduction of optical fiber even in the access network because of the growing demand for accessing the Internet with high bit rate. Since inexpensive total cost is strongly required for LAN or access network, we have proposed a large-core, low-loss, and high-bandwidth graded-index polymer optical fiber (GI POF) as a promising candidate of physical media. In this paper, we describe the recent development of the GI POF in its attenuation and bandwidth achieved by investigating a new polymer material and by theoretical analysis.

Recent progress of the graded-index polymer optical fiber (GI POF) is reviewed. Because the low attenuation of light transmission in the perfluorinated (PF) polymer based GI POF enables 500 to 1000 m transmission, more accurate analysis is required in the refractive index profile to realize the order of giga bit data transmission. The bandwidth characteristics of the GI POF were quantitatively clarified in this paper. Furthermore, it was clarified that the stability of the refractive index profile and the attenuation under high temperature and high humidity atmosphere could be remarkably improved by selecting the suitable dopant material.

A new new concept LCD backlighting system using the highly sacattering optical transmission (HSOT) polymer has the twice the brightness of the conventional backlight and uniform illumination. Light scattering phenomenon of a spheircal perticle inside the HSOT polymer is caluculated in detail by the Mie scattering theory. It was confirmed theoretically that, the color illuminated from the HSOT backlight could be controlled by the sphesified scatter leading to a high efficiency and high-visual quarity LCD backlighting system.

GIプラスチック光ファイバーの構造、作成法、その特性について詳細に解説する。

低損失、広帯域屈折率分布型ポリマー光ファイバーの最近の進展を解説した。

The progress of the GI polymer optical fiber (POF) for high-speed telecommunication is reviewed. Gigabit data transmission for several hundred meters from visible to 1.3-µm wavelength was experimentally enabled by the low-loss perfluorinated (PF) polymer based GI POF. We described an improvement in the thermal stability and long-term reliability of the GI POF.

伝送として高速通信が可能な屈折率分布型(GI型）ポリマー光ファイバーを、ディスプレイとしてポリマー内に均一にミクロ不均一構造を形成させた高輝度光散乱ポリマー導光体からなるLCDについて、従来の屈折率均一材料と比較しつつ解説する。

The progress of the GI Polymer optical fiber (GI POF) for high-speed telecommunication is reviewed. Gigabit data transmission for several hundred meters from visible to 1.3µm wavelength was experimentally enabled by low-loss perfluorinated polymer based GI POF. Possible bandwidth and transmission distance achieved by POF are described in this paper.

Recent progress of graded-index polymer optical fiber (GI POF) and POF amplifier (POFA) are reviewed. Because the low attenuation of light transmission in the perfluorinated (PF) polymer, PF polymer based GI POF enables 500 to 1000m transmission, more accurate analysis is required in the refrective index profile to realize the order of giga bit transmission. Furthermore, recent improvement of the thermal stability of the GI POF is intorduced. We clarified that the stability of the refractive index profile and the attenuation under high temperature and high humidity atomosphere can be improved by selecting the suitable dopant material. We demonstrated that the organic dye-doped POFA cover a wide spectral range in the visible with the best observed gain of 37 dB in a Rhodamine B-doped POFA pumped at 550nm. Also, with an europium chirate of hexafluoroacetylacetone in tris form doped GI POF, we observed superfluorescence, evidenced by spectral narrowing and lifetime shortening. The propospect is that the wide choice of ortganic dyes and rare earth chelates offers optical amplifiers and superfluorescent source for a variety of communication and sensor applications.

高分子材料を用いた光学素子の作製方法とその特性の解説

”伝送”として高速通信が可能な屈折率分布型（GI型）ポリマー光ファイバー、”発信”として誘導放出能を有する有機物質をわずかに含むポリマー光ファイバー増幅器、”表示”としてディスプレイとしてポリマー内均一にミクロ不均一構造を形成させた高輝度光散乱ポリマー導光体からなるLCDについて、従来の屈折率均一材料と比較しつつ解説する。

高速ポリマー光ファイバーの特性評価と実際のマルチメディアネットワークへの応用検討

新しい機能性フォトニクス材料に付き、現在研究開発中の超高速ポリマー光ファイバー、光散乱ポリマー導光体、ゼロ複屈折性ポリマーを例に取り解説した。

新しい機能性フォトニクス材料に付き、現在研究開発中の超高速ポリマー光ファイバー、光散乱ポリマー導光体、ゼロ複屈折性ポリマーを例に取り解説した。

Recent progress of the polymer optical fiber (POF) and related photonics polymers for high-speed telecommunication is reviewed. The high-bandwidth perfluorinated GI POF, which has no serious absorption loss from visible to 1.3µm wavelength, is proposed as a promising candidate for "the last one mile."

The progress of GI polymer optical fiber (GI POF) for high-speed data communication is reviewed. It was experimentally confirmed that the gigabit data transmission for several hundred meter at 1.3-µm wavelength was enabled by the low-loss perfluorinated (PF) polymer based GI POF. We described an impotance in thermal stability and long-term reliability of the GI POF which is one of the key issue in order to realize the high-speed POF network. We believed that these progress of low-loss PF polymer based GI POF have triggered the realization of the high-speed POF network.

The status of the polymer optical fiber (POF) for high-speed data communication is reviewed. Recently, the low-loss and high-bandwidth perfluorinated GI POF which has no serious absorption loss from visible to near infreared region was successfully prepared at Keio University. Since the core diameter (300-1000µm) of the GI POF is much larger than that of the multimode silica fiber (62.5 µm),the serious modal noise in the conventional multimode silica fiber was virtually eliminated, resulting in stable giga bit order data transmission with inexpensive couplers and connectors.

The progress of the GI polymer optical fiber (GI POF) for high-speed teltcommunication is reviewed. It was experimentally confirmed that the gigabit data transmission for several hundred meter from visible to 1.3µm wavelength was enabled by the low-loss perfluorinated (PF) polymer base GI POF. We also described an importance in the thermal stability and long-term reliability of the GI POF. We believe that these progresses of GI POF have triggered the realization of the high-speed POF network.

Refractive index varies continiously within an inhomogeneous medium. Currentry the term "Graded Index" abbreviated to GI, is often used to describe such media. Such GI Materials desplay unique and useful optical properties that are not achieved by conventional optical materials with a constant refractive index. Many applications for GI materials have been reported for lenses and optical fiber communications. For example, all commercially available optical fiber's (POF's) have been of the step index (SI) type whose bandwodth is about 5MHz/km due to the modal dispersion. In contrast, the bandwidth of Gi POF is two hundred times as large as SI POF, so it will be able to cover the required bandwidth of tne high speed multimedia network.

Recent progress of the graded-index polymer optical fiber (GI POF) is reviewed. The low-loss perfluorinated (PF) polymer based GI POF experimentally achieved 3 GHz for 100m transmission in the range of visible to near infrared region. In addition, improvement of the thermal and long-term stability of the bandwidth of GI POF with using a new dopant material is described.