Presentations

Realization of all optical fiber networks even in the termination area is strongry requierd for high speed data transmission. POF has a great advantage in easy connection of fibers, which cannot be achieved by the small core conventional silica fiber, while it is similler to the connection of the copper cable. Therefore, as the POF can decrease the total network system cost including the fiber connector and optical transiver, the POF should be one of the promising candidates for transmissionmedia in the termination area of the all optical fiber network. Furthermore, it was confirmed that the perfluorinated (PF) polymer based GI POF enable to transmit 3.5Gb/s data for 200m. We believe that the high bandwidth PF polymer based GI POF can sufficiently cover the required data rate in the interface fo local area network (LAN) and forthcoming all optical networks.

POFの現状を、特に最近明らかにされてきた全フッ素化ポリマー系GI型POFにおける材料分散特性とそれがもたらす伝送速度の可能性を中心にして紹介し、併せてその通信ネットワークへの応用性についても簡単に触れる。

データ通信用途に重点を置き,現在注目を集めているPMMA系POFならびに全フッ素化プラスチック系GI型POFに関して紹介する。

世界最高速を可能にするＧＩ型ＰＯＦのこれまでの開発の動向と今後の展望、並びにＫ２タウンキャンパス内などに導入したＰＯＦ ＬＡＮの状況について講演した招待講演。

Plastic optical fiber (POF) which has distinguished features such as high bandwidth, low loss like silica optical fiber and easy handling similar to copper cable, is expected to be a high speed network medium. It has been reported that the GI POF enabled gigabit data transmission. Furthermore, it was also confirmed that higher bandwidth than silica base multimode fiber can be achieved by the perfluorinated polymer base GI POF because of the small material dispersion. In this paper, the recent development of the GI POF is described in detail.

Photosensitivity in a perfluoropolymer (CYTOP) optical fiber is investigated. Significant diffraction has been observed from transmission gratings made from the fiber. A maximum diffraction efficiency of 0.6% has been achieved, corresponding to a photosensitivity, in terms of the index change, approximately 3x10-4. This study demonstrates for the first time the existence of significant photosensitivity and feasibility of Bragg grating in CYTOP.

高速通信メディアとしてのGI型POFを中心とする高速通信用POFについて紹介する

This paper describes the potential bandwidth achieved by the graded-index polymer optical fiber (GI POF). Modal dispersion should be minimized to realize the high-speed data transmission in multimode type GI POF. On the other hand, when the refractive index profile is optimized to reduce the modal dispersion, another factors such as material, profile dispersion, mode coupling, and differential mode attenuation come to affect the bandwidth characteristics. In this paper, the maximum bandwidth of the GI POF is clarified by considering all important factors mentioned above, and ideal design of material and structure is also described.

Recent status of the polymer optical fiber (POF) for high speed data communication is reviewed. In this paper, two types of graded-index (GI) POFs, i.e. PMMA-base GI POF and perfluorinated (PF) polymer base GI POF, are described. The PMMA base GI POF is expected as the media of home networking based on IEEE 1394 S400 for up to 100m distance. On the other hand, the PF polymer base GI POF has the possibility of achieving the highest bit rate among existing physical media including even silica fiber, since the material dispersion of the PF polymer is lower than those of silica and other polymer materials. Therefore, more than 10Gb/s bit rate transmission such as 10 giga Ethernet can be achieved by the PF polymer base GI POF with using any wavelength from visible to 1.3µm wavelength region.

データ通信用途に重点を置き,現在注目を集めているPMMA系POFならびに全フッ素化プラスチック系GI型POFに関して紹介する。

高速通信メディアとしてのGI型POFを中心とする高速通信用POFについて紹介する

透明ポリマー固体内に、ミクロな不均一構造を形成することにより、従来の透明体光学に代わる、次世代・高輝度光散乱ポリマーの原理を解説する。それらを用いたＬＣＤバックライトならびにゼロ複屈折性フィルム、スクリーンへの応用展開について述べる

ポリマーの配向複屈折をナノサイズの複屈折性結晶を添加することにより相殺した。複屈折消去時のナノサイズの結晶とポリマー分子の配向状態を解析し、結晶の配向効率が高いことを明らかにした。この知見は、今後のナノテクノロジーの発展に大きく寄与するものである。

光、フォトン、ポリマー鎖等の相互作用など当研究室で行ってきた、フォトニクスポリマーの基礎検討結果を、詳細に解説した。

我々は一貫して光とポリマーの相互作用を基礎から検討し、その結果を分子デザインに適合し、GI-POF、HSOTポリマー、ゼロ複屈折性ポリマー等のフォトニクスポリマーを開発してきた。これらのフォトニクスポリマーの基礎から応用、今後の展開等について詳しく解説した。

Both modal and material dispersions in a POF were minimized by forming a W-shaped refractive index profile with using a low-loss fluorinated polymer. Compared with the conventional PMMA based POF, higher-speed and longer-distance transmission were possible since the fluorinated polymers had lower attenuation than PMMA, and the W-shaped refractive index profile remarkably decreased the modal dispersion. We exhibited that by adopting a perfluorinated (PF) polymer with low material dispersion, the GI and/or W-shaped POF would enable the data transmission higher than the 10 Gb/s that has been a critical bit rate for the conventional silica based multimode fibers (MMFs).

New properties and potential applications of Photonics Polymer are explained along with the basic studies on the relationship between photon lights and various polymer chains which create new properties. As results, we have come to original discoveries such as Graded Index Plastic Optical Fiber with longer-distance transmission, less distorted transmission of ultra high-speed signals, more accurate control of polarized waves, more concentration, and more amplification.

New properties and potential applications of Photonics Polymer are explaining along with the basic studies on the relationship between photon lights and various polymer chains which create new properties. As results, we have come to an original discoveries such as Graded Index Plastic Optical Fiber with longer- distance transmission, less distorted transmission of ultra high-speed signals, more accurate control of polarization wave, more concentration, and more amplification.

We report a method for compensating the birefringence of optical polymers by doping them with nanometer-size inorganic birefringent crystals. In this method, an inorganic birefringent crystal is chosen that has the opposite birefringence to the polymer and rod like shape which are oriented when the polymer chains are oriented. As a result, the birefringence of the polymer is compensated by the opposing birefringence of the crystal.

ディスプレイまで直接光信号が送られるいわゆる“Fiber-to-the Display”に大きな関心が寄せられつつある。その伝送路として、フレキシブルでギガビット以上の伝送を可能とする高速プラスチック光ファイバー（GI型POF）が注目されている。筆者は、家庭の安心、安らぎをもたらす真のブロードバンド社会の在り方は、キーボード一辺倒のものではなく、等身大の高画質ディスプレイによる双方向のリアルタイムコミュニケーションであろうと考える。深夜に一人住まいのご老人が具合悪くなったときにボタンを押すだけで、病院とつながり、「どうしましたか」という対話をすることができれば、どんなに安心感が得られるでしょう。産学連携の在り方、およびFace-to-Faceに戻るギガビット社会と生活について講演する。