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Due to its handling capability of huge amount of information,\nit is a fundamental technology supporting the information society.\nThis class covers the principle and the most recent technologies of\noptical fiber communications.\n\n今年度の本講義の主題は光通信とする。\n光通信は、通信分野の中で最も新しい技術である。実用になってから30年\n余りと歴史は浅く、今日も急速に発展しているが、通信能力は極めて秀で\nており、社会のあらゆるところで今後使われてゆく通信技術である。光通\n信の技術要素と通信方式について基礎的な原理を学ぶと共に、最新の技術\nについても理解することを目標とする。","Fundamental courses in the elementary years such as physics, wave and lightwave, \ncircuit and system, etc..\n\n物理学概論 波動と光、電磁気学関連の科目、回路・システム学(電気回路学)\nなどの1,2年次の必修科目","Understanding of Fourier analysis and relation between temporal and\nspectral signals is recommended.\n\nフーリエ解析・フーリエ変換を扱い、時間とスペクトルの概念の理解を得る\nための科目を履修しておくと良い。\n","教科書は使用しない。講義に用いる資料は上記「授業関連Webページ」にて\n公開する。このページは学外からはパスワードによる閲覧のみ可能である。","Since this class is opened for foreign students, class documents are\nwritten in English.   Followings are the contents of the class.\n1. Introduction of optical fiber communications\n2. Properties of lightwave as a high-frequency electromagnetic waves\n3. Introduction of optical fiber waveguides\n4. Linear and nonlinear characteristics of optical fibers which are important to understanding the signal transmission characteristics.\n5. Principles of lightsources\n6. Structure and operation principles of Semiconductor laser diodes and light-emitting diodes\n7. Single-frequency and multi-frequency lightsources for optical communications\n8. Various optical devices employed in optical communication systems\n9. Operation principles of optical amplifiers/repeaters for long-distance optical communication systems\n10. Characteristics of various optical amplifiers\n11. Digital modulation schemes for optical communications\n12. Architecture of  optical communication systems\n13. Problems associated with the development of optical communication technologies and the solutions\n14. Capacity limit of optical fibers, optical networks, and optical access systems\n15. Optical fiber sensing technologies and optical fiber sensors\n\n\nこの科目は短期留学プログラム及び国際科目の授業としても併せて開講されて\nおり、資料の多くは英語を主体として用意されている(日本語併記有り)。\n今後、英語の文献や専門用語に触れる機会が多くなるので慣れておくと良い。\n内容は以下のとおり。\n\n1 光ファイバ通信の概要を学ぶ。\n2 光通信の伝送媒体である光の特質と、低周波電磁波との違いを理解する。\n3 光ファイバ伝送路の構造と光の導波の原理を学ぶ。\n4 光ファイバの重要な特性である、線形特性及び非線形特性を学び、信号の\n  伝送特性との関係を提示する。\n5 光信号源の基礎となる、光の発生の原理を学ぶ。\n6 代表的な光信号源である半導体レーザと発光ダイオード構造と特性・用途を理解する。\n7 光通信に特化した、単一周波数もしくは多波長光源、パルス光源について学ぶ。\n8 長距離光通信システムにおいて必須の光増幅器の動作原理を学ぶ。\n9 各種の光増幅器の特性と特徴を学ぶ。\n10 光通信システムを構成する上で必須の光素子について学ぶ。\n11 デジタル光信号の符号化の概要、受信の際の信号の品質評価法について学ぶ。\n12 光通信システムの形態について学ぶ。\n13 光通信システムの高性能化に伴う問題と、それを解決するためのいくつかの手法について学ぶ。\n14 光ファイバで伝送可能な情報量の限界、光ネットワーク、末端の加入者のための光ファイバ通信システムについて学ぶ。\n15 光や光ファイバを利用した計測方法・光ファイバセンサについて学ぶ。 ","","Review with the contents of the class documents and other suitable references\nEvaluation and grading.\n\n授業関連Webページの資料や、適切な書籍などで復習すること。","A report on the class is assigned.  The credit is given if a minimum of 60% is achieved in the evaluation of the report.\n\n学期末に授業内容に関するレポートを課し、レポートの成績評価の6割を持って合格最低基準とします。","from 12:30 to 14:30 on Wednesday, or the time just after the class\n\n\n水曜日の午後12:30から14:30頃までの時間帯、もしくは授業終了直後。","Optical communication is and will be one of the key technologies in the fundamental of communication networks.  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