Tài liệu Nghiên cứu, mô phỏng và thiết kế sợi pcfs lõi chiết suất cao cấu trúc 6 cạnh

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Nghiên cứu, mô phỏng và thiết kế sợi PCFs lõi chiết suất cao cấu trúc 6 cạnh
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Basically, a PCF is a photosynthetic fiber composing of silica with air holes parallel to its axles. Unlike conventional fiber, the core and cladding areas of PCFs are made of the same material and it is the air holes that make PCF totally different from other kind of fiber. The variety in the way these air holes are arranged enables PCF to control well the reflection of light between its core and optical crystals within cladding areas and bring about many amazing optical properties as well. Besides the basic properties similar to conventional fiber, PCF possesses a number of distinguished ones such as better speed, bandwidth, and ability to be bent, low level of dispersion, etc. Also, PCF can be in endlesslly single mode, be linear or not, having low differential index, and be able to maintain the polarization. All of these superiorities make PCF the potential substitute for conventional fibers today. At the moment, PCF can be produced with great length and at low depreciation levels. There are two main types of PCF: high-index core fiber and low-index core fiber. In this project, I will focus primarily on high-index core fiber, the one our group has done a lot of research on, reproduced and designed using APSS program. This kind of PCF often has solid core and is composed of pure, not mixed materials. The degree of reflection for conventional fiber is affected by various ordering PDQQHUVRIDLUKROHVHLWKHUDFFRUGLQJWRDFHUWDLQIRUP KH[DJRQDORFWDJRQDO« RU a certain direction (one-dimensional, two-dimensional or three-dimensional). The difference in the way air holes are ordered creates the differences in the properties of each kind of fibers. A reasonable way of ordering them can produce a PCF with excellent properties. Some samples of PCF with air holes arranged into hexagonal form were imitated in this project (please refer to Reproducing part for more details). http://www.ebook.edu.vn 4 0Ө&/Ө& LӠ,1Ï,ĈҪU .................................................................................................................. 1 7Ï07Ҳ7ĈӖ È1............................................................................................................ 2 ABSTRACT...................................................................................................................... 4 MӨC LӨC ........................................................................................................................ 5 '$1+6È&++Î1+9Ӏ................................................................................................... 8 '$1+6È&+%ҦNG BIӆU............................................................................................ 10 '$1+6È&+&È&7Ӯ VIӂT TҲT ................................................................................ 11 PHҪN MӢ ĈҪU............................................................................................................. 12 CHѬѪNG 1 - Lé7+8<ӂT TӘNG QUAN Vӄ SӦI QUANG.................................... 13 1.1 Nhu cҫXEăQJWK{QJUӝng hiӋn nay ......................................................................... 13 1.2 Giӟi thiӋu chung vӅ sӧi quang................................................................................ 15 1.2.1 Lӏch sӱ SKiWWULӇn sӧi quang ............................................................................ 16 ѬXÿLӇm cӫa sӧi quang.................................................................................... 17 1.3 Sӵ truyӅQVyQJiQKViQJWURQJVӧi quang ............................................................... 19 1JX\rQOêWUX\Ӆn dүn ...................................................................................... 20 1.3.2 SӧLTXDQJYjFiFPRGHWUX\Ӆn dүn .................................................................. 21 &iFSKѭѫQJWUuQK0D[ZHOO.............................................................................. 23 &iFSKѭѫQJWUuQKGүQVyQJ.............................................................................. 24 6X\KDRYjFiFQJX\rQQKkQJk\VX\KDRWURQJVӧi quang ...................................... 24 1.4.1: Suy hao hҩp thө ............................................................................................. 24 1.4.1.1 Sӵ hҩp thө cӫDFiFWҥp chҩt kim loҥi ......................................................... 24 1.4.1.2 Sӵ hҩp thө cӫa ion OH: ............................................................................ 25 1.4.1.3 Sӵ hҩp thө bҵng tia cӵFWtPYjKӗng ngoҥi: .............................................. 26 1.4.2 Suy hao do uӕn cong....................................................................................... 26 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.............................................................. 32 1.6 SӧLÿѫQPRGHYjÿDPRGH..................................................................................... 32 1.6.1 SӧLÿѫQPRGH 606LQJOH0RGH ................................................................... 32 1.6.2 SӧLÿDPRGH 000XOWL0RGH ..................................................................... 33 7¬,/,ӊU THAM KHҦ2&+ѬѪ1* ....................................................................... 35 CHѬѪNG 2 - SӦI QUANG TINH THӆ (PHOTONIC CRYSTAL FIBER).............. 36 2.1 Giӟi thiӋu sӧi quang tinh thӇ PCF .......................................................................... 36 ĈӏQKQJKƭD ...................................................................................................... 36 2.1.2 Lӏch sӱ............................................................................................................ 37 3KkQORҥLYjWtQKFKҩt mӟi cӫa PCFs ...................................................................... 42 3KkQORҥi ......................................................................................................... 42 2.2.2 Mӝt sӕ WtQKFKҩt mӟi cӫa PCFs........................................................................ 43 27tQKFKҩt cӫa sӧi quang tinh thӇ FyO}LFKLӃt suҩt cao ............................................. 44 7tQKFKҩt cӫa sӧi quang tinh thӇ FyO}LFKLӃt suҩt cao vӟLFiFOӛ NKtVҳp xӃSFy cҩXWU~F.................................................................................................................... 46 ĈѭӡQJÿһFWtQKGȁ .................................................................................. 47 7tQKFKҩWQJѭӥng ..................................................................................... 49 2.3.1.3 Suy hao do uӕn cong cӫa PCFs l}LFKLӃt suҩt cao...................................... 53 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