Proceedings - Viá»n Váºt lÃ½

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_________________________________________________________________________________Những tiến bộ trong Quang học, Quang tử, Quang phổ và Ứng dụng. 8/2006, Cần Thơ, Việt NamBảng 3Như vậy khi n 0.0002 0.0001 0.00008L 0 (m) 10 179 17 169 19 715 n càng nhỏ thì độ dài khoảng truyền L 0 càng lớn và ngược lại.3.4. Thay đổi bán kính của các ống dẫn sóng phẳngKhi thay đổi bán kính các ống, các đồ thị thu được cho thấy khoảng truyền L 0giảm khi đường kính ống tăng như trình bày ở bảng 4.Bảng 4d(μm) 0.2 0.5 1L 0 (m) 38 449 17 169 5 1303.5. Thay đổi các tham số A,B,CĐể thấy được ảnh hưởng của sự tương tác giữa các sóng truyền trong ống dẫnsóng có biên độ khác nhau, biến đổi biên độ của các giá trị biên độ A,B,C (bảng 5).Bảng 5A 2 2 2 1 1B 2 2 1 2 1C 2 1 2 2 1L 0 (m) 5 380 10 180 6 769 6 857 17 169Từ bảng số liệu ta thấy khi cả 3 biên độ A,B,C cùng giảm thì khoảng truyền L 0tăng rất mạnh chứng tỏ sự tương tác giữa các sóng là rất nhỏ không đáng kể nênhiện tượng xuyên kênh sẽ xảy ra ở khoảng cách rất lớn.4. Kết luậnTrong bài báo này, chúng tôi đã khảo sát ảnh hưởng của các thông số sợi quanglên khoảng truyền L 0 khi xảy ra hiện tượng xuyên kênh. Kết quả thu được cho thấy:Hiện tượng xuyên kênh phụ thuộc mạnh vào sự thay đổi cấu trúc của sợi quang.Một trong những thông số ảnh hưởng lớn tới hiện tượng xuyên kênh là: hiệu chiếtsuất n, bước sóng và bán kính ống dẫn sóng.Với các ống dẫn sóng đa mode, tỉ số α/μ đặc trưng cho tỉ số biên độ của cácmode trong cùng 1 ống dẫn sóng cũng ảnh hưởng tới hiện tượng xuyên kênh.Ngoài ra khi biên độ hay cường độ của các ống dẫn sóng lan truyền tăng lên sẽlàm cho hiệu ứng xuyên kênh xảy ra sớm hơn. Như vậy có thể thấy khi tăng côngsuất của sóng, người ta có thể có lợi về sự truyền dẫn nhưng hiện tượng xuyên kênhlại xảy ra sớm hơn làm hạn chế chất lượng truyền tin. Đặc điểm này cần được lưu ýtrong thực nghiệm thông tin quang.536
Advances _________________________________________________________________________________in Optics, Photonics, Spectroscopy and Applications. Aug. 2006, Cantho, VietnamTài liệu tham khảo:1. A.Yariv, Quantum Electronics Third Edition, John Wiley & Sons, N.Y. 19882. H.Huang, Couple Mode Theory as applied to Microwave and Optical Transmission,Netherlands 1984.3. T. Tamir, Guided Wave Optoelectronics, Springer-Verlag N.Y. 19904. B.E.A Saleh, M.C Teich, Fundamentals of photonics, John Willey & Sons N.Y. 19915. Dinh Van Hoang, Mai Hong Hanh, Crosstalk effect in the case of three monomodeplan wave guides, to be published in Journal of Science VNU N 0 2. 2006.537
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AdvancesinOptics,Photonics,Spectros
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Những tiến bộ trongQuang họ
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KỶ YẾU CÁC HỘI NGHỊo Hội
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MỤC LỤCThông tin về hội ng
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NATURAL RADIOACTIVITY IN SOME ANCIE
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THIẾT KẾ VÀ CHẾ TẠO CHIP C
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HỌC CHƯƠNG TRÌNH VẬT LÝ THP
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Conference TopicsQuantum PhotonicsP
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Invited speakersNguyen Van Hieu (VA
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SESSION A1: QUANTUM PHOTONICS AND N
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Chairperson: Dr. Phan Ngoc Minh (IM
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SESSION A2 :SPECTROSCOPY OF CONDENS
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(A2-14)08: 45 - 09: 05 FABRICATION,
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(A2-36)09: 00 - 09: 20 NANO PARTICA
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SESSION B: OPTICS, LASERS and PHOTO
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(B-13)08: 45 - 09: 05 FREQUENCY STA
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(B-27)16: 30 - 16: 50 DEVERLOPMENT
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14: 10 - 14: 30 THE SEMI-STATISTICA
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(C-07)10: 15 - 10: 35 THERMOLUMINES
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(C-22)08: 30 - 08: 50 DESIGN AND FA
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(C-37)15: 30 - 15: 50 CACULATING EM
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Những tiến bộ trong Quang h
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3.4 Reliability of resultsFigure 1
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Page 560 and 561: DANH SÁCH CÁC BÀI ĐƯỢC ĐĂN
Page 562: Le Dinh Trong, Pham Duy Long, Vu Va
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