巻号一覧
41 巻, 6 号
「空間多重伝送を支える光ファイバおよび光デバイス技術」特集号
選択された号の論文の12件中1～12を表示しています
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「空間多重伝送を支える光ファイバおよび光デバイス技術」特集号
特集
レーザー解説
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石﨑 章仁2013 年 41 巻 6 号 p. 391-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスRecent two-dimensional electronic spectroscopic experiments revealed that electronic energy transfer in photosynthetic light harvesting involves long-lived quantum coherence among electronic excitations of pigments. These findings have led to the suggestion that quantum coherence might play a role in achieving the remarkable quantum effi ciency of photosynthetic light harvesting. Further, this speculation has led to much effort being devoted to elucidation of the quantum mechanisms of the photosynthetic excitation energy transfer. In this review, we provide an overview of recent experimental and theoretical investigations of photosynthetic electronic energy transfer, specifi cally addressing the observed longlived coherence. We close with some thoughts on directions for future developments in this area.抄録全体を表示PDF形式でダウンロード (1552K) -
小柴 正則2013 年 41 巻 6 号 p. 398-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスPDF形式でダウンロード (162K) -
松尾 昌一郎, 竹永 勝宏, 齊藤 晋聖, 小柴 正則2013 年 41 巻 6 号 p. 399-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスThis paper reviews our activities on multicore fi bers for extremely large capacity transmission. First, we presented the multicore fiber features with a one-ring structure that was used in a transmission experiment that realized record capacity of 1.01 Pb/s/fi ber. Multicore fi bers with a one-ring structure can overcome three problems with hexagonal close-packed structures. Finally, we presented two approaches to enlarge the core multiplicity. A quasi-homogeneous Aeff heterogeneous multicore fi ber realizes bend insensitivity and very small crosstalk. A few mode multicore fi bers might drastically enlarge the core multiplicity.抄録全体を表示PDF形式でダウンロード (1525K) -
笹岡 英資2013 年 41 巻 6 号 p. 406-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスMulti-core optical fi bers are eagerly developed recently, because they are one of strong candidates to overcome transmission capacity limit of existing optical fi bers. Number of cores and inter-core crosstalk are often highlighted in multi-core optical fiber development, because they are unique parameters of multi-core optical fibers. But, transmission loss and nonlinearity of each core are also important parameters especially for multi-core optical fi bers for long-haul and large capacity transmission systems. In this paper, following brief description of issues and measures to realize a low loss low nonlinearity multi-core optical fiber, an example of design and characteristics of a fabricated multi-core fiber is described. Impacts and future challenges of low loss low nonlinearity multi-core optical fi bers are also mentioned.抄録全体を表示PDF形式でダウンロード (734K) -
杉崎 隆一, 安田 正隆, 今村 勝徳, 武笠 和則2013 年 41 巻 6 号 p. 414-
発行日: 2013年
公開日: 2020/09/07
ジャーナル フリーAs a fi ber with extreme multiplexing ability, we fabricate seven-core fi ber whose cores can guide two LP modes. This fiber is also suitable for systems with multi-level modulation format due to its low nonlinearity. Characteristics of this fi ber and propagation of each mode are described in this paper.抄録全体を表示PDF形式でダウンロード (1077K) -
増田 浩次2013 年 41 巻 6 号 p. 416-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスWe discuss the features and trends of new space-division-multiplexing technology: multicore and multimode optical fi ber amplifi cation for realizing long-haul optical transmission systems with a future class capacity of petabits per second. Recent research activities are reviewed, and enabling technologies for increasing the transmission capacity and improving the optical signal-to-noise ratio are discussed.抄録全体を表示PDF形式でダウンロード (706K) -
小林 哲也, 渡辺 正行, 鳥取 裕作2013 年 41 巻 6 号 p. 423-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスLens optics technology is reviewed for the design and fabrication of fan-in/fan-out devices to connect a multicore fi ber to single mode fi bers and optical connectors for multicore fi bers. We describe the design principle of lens coupling using spatial beam conversion theory for fan-in/fan-out devices and multicore fi ber connectors and show their optical characteristics. We also discuss the feasibility of the devices for multicore fi ber transmission systems.抄録全体を表示PDF形式でダウンロード (1925K) -
長瀬 亮2013 年 41 巻 6 号 p. 428-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスOptical connectors and fan-out components are essential to realize ultra-wide band optical communication systems using multicore fibers. This paper describes butt-joint type multicore fiber connectors and fan-out components. Proposals on these components are expected for practical use as well as such developments.抄録全体を表示PDF形式でダウンロード (450K) -
半澤 信智, 齊藤 晋聖, 坂本 泰志, 松井 隆, 辻川 恭三, 小柴 正則, 山本 文彦2013 年 41 巻 6 号 p. 432-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスWe demonstrated mode multi/demultiplexing with an asymmetric parallel waveguide for mode division multiplexed transmission, which we designed and fabricated to multiplex the LP01 and LP11 modes. Our fabricated mode multi/demultiplexer realized a low insertion loss of < 0.8dB for the LP01 and LP11 modes. We achieved a 2 mode × 4 wavelength × 10 Gbps MDM-WDM transmission in the C-band over a 9 km-long two-mode fi ber using a waveguide mode multi/demultiplexer with a low insertion loss and highly effi cient mode conversion.抄録全体を表示PDF形式でダウンロード (588K) -
高良 秀彦2013 年 41 巻 6 号 p. 437-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスThe paper reviews recent works and issues on large-capacity transmission based on multi-core spacedivision-multiplexing.抄録全体を表示PDF形式でダウンロード (926K)
一般論文
レーザーオリジナル
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八若 正義, 田中 正俊, 藤巻 洋介, 谷口 浩一2013 年 41 巻 6 号 p. 442-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスWe studied the connection of a multi-core fiber (MCF). We fabricated a FC-type connector with a hexagonal-shaped cladding MCF and achieved an average connector loss of 0.51dB. Further reduction of the connection loss can be realized by using of the connector parts which have higher fabrication accuracy.抄録全体を表示PDF形式でダウンロード (1259K)
レーザーレクチャー
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橋新 裕一2013 年 41 巻 6 号 p. 447-
発行日: 2013年
公開日: 2020/09/07
ジャーナル オープンアクセスThis report explains the international and Japanese safety standards about the laser equipment. Basic standard is “IEC 60825-1 Safety of laser products” , correspond to JIS C6802. The related standard is “IEC 60601-2-22 Medical electrical equipment - Particular requirements for basic safety and essential performance of surgical, cosmetic, therapeutic and diagnostic laser equipment”. These standards provide the following clause: terms and definitions, general requirements, label, classified class, MPE “Maximum Permissible Exposure” and user's guide. Accident and incident reports are important for making standard. This is a pressing need for Japan that many experts of standardization procedure are bring up.抄録全体を表示PDF形式でダウンロード (1912K)
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