臺灣博碩士論文加值系統

由於資訊流通的需求呈指數般大量的成長，通信頻寬早已嚴重地不足。近年來由於DWDM技術的發展，解決了一部份的問題，但通訊的高成長仍然在持續著。伴隨著傳輸時脈的增加以及傳輸距離的拉長，以往可加以忽略的光纖傳導的現象，如今已經變的越來越重要了，偏極化色散正是一個很好的例子。
在本篇論文中主要是從偏極化色散的物理成因及在光纖中的物理現象開始探討，並利用這些現象來量測偏極化色散對於光纖傳輸系統的影響，以期建立起一套完整的量測及評估用的實驗架構，並以此為基礎，研究補償偏極化色散的適當方式。文中也探討到使用一段具有固定群速度差的光纖來製作一個自動補償的實驗架構，並驗證其適用於各種不同的傳輸方式。
此外，也利用以上所架構出來的量測以及補償系統，結合短脈衝光源，進行在光固子傳輸系統中，偏極化色散的影響及變化的實驗，以驗證在光固子傳輸理論中，偏極化色散減弱的效應。

Transmission bandwidth is seriously insufficient owing to the requirement of the information acquiring has developed in exponential growth. The improvement of the DWDM technology has solved some problem, but the requirement of communication is still in development. As the increasing of the transmission bit rate and the transmission length, some phenomenons, which can be ignored before, become more and more important today. The polarization mode dispersion (PMD) is a good example.
In this thesis, we start the discussion from the physical mechanism and phenomenon of PMD. We take advantages of these physical phenomenons to establish a complete measurement and examination system and study the proper way to compensate PMD base on these structures. We also discuss the way of using a polarization maintaining fiber (PMF) with a fixed differential group delay to manufacture an auto compensation system, which is useful for kinds of fiber transmission systems.
Besides, using these measurement and compensation systems, combining the short pulse, we can proceed with the experiments about the PMD effects in soliton transmission system in order to proof the theory that there exist weaker PMD effects in soliton transmission system.

Page
Chinese Abstract……………………………………………………………… I
English Abstract……………………………………………………………… Ⅱ
Contents……………………………………………………………… Ⅲ
Figures Captions…………………………………………………… Ⅴ
CHAPTER 1
Introduction………………………………………………………… 1
CHAPTER 2
Basic Concept of PMD Effect
2.1 Origin of Polarization Effects in Fiber ……………… 4
2.2 The Mechanism of PMD Effect
2.2.1 Polarization Effect In Short Fibers………………… 6
2.2.2 Polarization Effects In Long Fibers Spans…………… 9
2.3 Principal States Model………………………………………… 13
2.4 The Pulse Broadening Caused by PMD Effect……………… 16
2.5 Dispersion Limits……………………………………………… 19
CHAPTER 3
The PMD Measurement
3.1 PMD Measurement Methods……………………………………… 21
3.1.1 Pulse Delay Measurement…………………………………… 22
3.1.2 Interferometric Method……………………………………… 23
3.1.3 Poincare Sphere Method……………………………………… 24
3.1.4 Fixed Analyzer Method………………………………………… 25
3.2 Poincare Sphere Method
3.2.1 Polarization States In Frequency Domain………………… 27
3.2.2 Wavelength Dependence Of Output Polarization………… 29
3.2.3 Analyzing techniques of Poincare sphere method……… 31
3.3 Experimental setup of PMD measurement……………………… 34
3.4 Experimental results of PMD measurement
3.4.1 Theoretical value of DGD of the PMF (Fibercore)……… 36
3.4.2 Experimental result of the Poincare sphere method…… 37
3.5 Discussion and conclusion……………………………………… 41
CHAPTER 4
The PMD Compensation
4.1 Introduction
4.1.1 PMD compensation techniques……………………………… 42
4.1.2 Relationship of the degree of polarization……… 43
4.2 Experimental Setup of PMD Compensation………………… 45
4.3 Experimental results of PMD compensation
4.3.1 Using tunable laser as the light source……………… 46
4.3.2 Using short pulse (~13ps) as the light source……… 48
4.3.3 Using short pulse (~1.2ps) as the light source……… 50
4.4 Discussion and conclusion…………………………………… 51
CHAPTER 5
PMD Effect In Soliton System
5.1 Introduction…………………………………………………………… 52
5.2 Fundamental average soliton…………………………………… 52
5.3 Experimental setup……………………………………………… 54
5.4 Experimental results…………………………………………… 57
5.5 Discuss and conclusion………………………………………… 60
CHAPTER 6
Conclusions…………………………………………………………… 61
Reference………………………………………………………………… 62
Appendix..……………………………………………………………… 64

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