光纖光柵與光交換模組應用

Abstract

單模光纖額外再加纖殼2 於纖殼1的外圍，可以變成多模光纖，這個功能可以增加新的應用例如設計新的長週期光纖光柵。其所需要的知識就是耦合模態理論與轉移矩陣的計算方法。因此可以發展出新的三層結構布拉格光纖光柵，與多波長之長週期光纖光柵帶斥濾波器。分碼多工應用在光纖通信也是可以，它的碼語可以對應到，寬的光波帶中的有限次波帶，成為光分碼多工的應用。它的應用很廣，而且有大頻寬與高速的特點，可以迎合未來光信號處理時代的需求。 1310奈米長的光波可以被雷射產生，且被耦合進單模光纖，應用於傳統光通信。事實上，單模光纖在1550奈米長附近的光波段，有最低傳送損失，受到電信業廣泛使用。因此從1300 到 1620奈米長的光波段，被用在現代光通信。這個光波段有超過40 terahertz可用頻寬。如何分波段充分使用，那是關心的議題。分波段使用波寬，符合光分碼多工編碼器的需求。利用使用者的數據資訊，去調變白光光源，再去經過光分碼多工編碼器，就完成建立擬實通道。白光光源取代窄波寬的雷射光源可以用在光分碼多工系統的發射端。 大信號頻寬與低損失，吸引光通信工程師研究多種光纖應用。例如光纖通信可動態調整密式分波多工與光學式分碼多工的頻寬使用的研究題目。光纖的信號處理技術，實現了上述構想。最近光纖光柵被發現，可以同時過濾多個不同波長的光波。許多更細的方法製成不同型式的光纖光柵，實現濾波功能。包括布拉格光柵、啁啾光柵、長週期光柵、高斯無足光柵、相移光柵與超結構光柵等。本論文將研究多波長濾波光纖光柵。其許多應用例如光分碼多工交換模組、光乙太光纖鄰接模組之全雙工與半雙工、分碼多工個人電腦主機板擴充槽接法等值得去製造使用。本文也先收集一些優良的分析例子去了解光纖光柵，研究長週期光纖光柵可以被設計出多波長濾波功能。本論文所提的單模光纖額外再加纖殼2 於纖殼1的外圍，這種革新的長週期多波長濾波光纖光柵用於光分碼多工 8X8 交換功能，在本論文將被提出充分討論與展現。

A single-mode fiber becomes a multimode fiber when cladding2 is added outside cladding1. The addition of cladding2 supports new applications, such as new long-period fiber gratings. Coupled Mode Theory and Transfer Matrix are principal to design and simulation fiber gratings. Types fiber grating are useful in modern optical communication. CDMA codeword could be map to wavelengths. That’s why optical CDMA switching works. Large bandwidth and high speed switch rate are meet characters of future telecommunication network requirements. Light with a wavelength of 1310 nm wavelength is generated by a laser, and is coupled into SMF for traditional optical fiber communication. The lowest loss wavelength band of the SMF, which is around 1550 nm, is favored for telecommunication. The band from 1300 to 1620 nm of wavelength is in fact used for modern optical fiber communication. A bandwidth over 40 THz is available utilized. The full use of a sectionalized band is an issue of concern. Sectionalized bands satisfy Optical Code Division Multiple Access requirements. A white light source is modulated by user data and passed through the OCDMA coder. The white light source replaces a laser which is a narrow-band light source, for CDMA systems. The huge signal bandwidth and low loss of optical fibers are of particular interest to optical communication engineers because of their potential importance in fiber optical applications. Studies of dynamic adjustable bandwidth and usage in each channel of a DWDM and OCDMA are advanced. Optical fiber signal process approaches can realize the optical fiber grating for filtering multiple wavelengths. Several methods can be utilized to make various gratings that can function as filters. These include Bragg gratings, chirped gratings, long-period gratings, Gaussian apodization gratings, phase-shift gratings, superstructure gratings and others. These are good for tailoring gratings with complicated superstructures. These investigate optical fiber grating for filtering multiple wavelengths. Step by step present to develop the long-period fiber grating multiple wavelength filters was described in this text. Examples are considered to help understand fiber gratings and LPFG can be used in the development of multiple-wavelength filters. The first on the world with LPFG which cladding2 is added outside cladding1 is made of single-mode fiber and application of OCDMA 8X8 switching is realized using multiple-wavelength filtering of LPFG, as well as CDMA Optical Ethernet Adjacent Fiber Module works with duplex and half duplex mode simultaneously and OCDMA Expansion Connector of PC mother board. They are described in appendixes in this thesis.