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博碩士論文 etd-0702110-152039 詳細資訊
Title page for etd-0702110-152039
論文名稱
Title
利用數位同調接收端解析APSK調變技術的理論及實驗探討
APSK Transmission Experiment Using Digital Coherent Receiver
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
43
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2010-06-25
繳交日期
Date of Submission
2010-07-02
關鍵字
Keywords
調變技術、數位同調接收端
amplitude and phase shift keying, digital coherent receiver, modulation format
統計
Statistics
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The thesis/dissertation has been browsed 5726 times, has been downloaded 1585 times.
中文摘要
在現今的傳輸系統中,由於光放大器限制了可利用的頻寬,所以如何更有效率的使用頻寬是一項非常重要的問題。進階的調變技術中,頻譜效率高並可以有效增加傳輸量的強度及相位調變技術(APSK ; Amplitude and Phase Shift Keying)無疑有著很好的發展潛力,本論文著重於使用數位同調接受端以解析強度及相位調變技術並探討使用Zero-nulling method對傳輸表現的影響。

由於強度及相位調變中,不論是強度調變(ASK ; Amplitude Shift Keying)還是相位調變(PSK ; Phase Shift Keying)的傳輸表現都會受到強度調變的消光比(ER ; Extinction Ratio)的改變而變化,而且消光比對於ASK及PSK的傳輸表現成反比,所以本論文探討在不同ER下ASK和PSK訊號所造成傳輸表現的影響。

初步進行實驗架構後,首先便是藉由不斷修正改良數位訊號轉換器的接收端程式,確認數位同調接收端透過程式可以正確解析APSK的訊號,論文中架設了500公里長光纖來量測長距離下APSK的傳輸表現,並嘗試利用再迴圈系統(recirculating loop)來更進一步增加光纖傳輸距離,並得以傳輸數千公里。

最後,藉由進一步的修改接收端程式來達成APSK調變技術中的Zero-nulling method,並能有效證明其可行性。
Abstract
In the current transmission system, the information bandwidth of the optical fiber communication system is limited by optical amplifier bandwidth, and more efficient use of bandwidth is a very important issue. Amplitude and phase shift keying (APSK) is an advanced modulation scheme to improve the spectral efficiency and can effectively increase the transmission capacity. Certainly, APSK format has a good potential for development. This master thesis is focusing on that to study the transmission performance of the APSK format using digital coherent receiver.

As the extinction ratio (ER) of the amplitude shift keying (ASK) signal affects the performances of the ASK signal and phase shift keying (PSK) signal simultaneously, the effect of the ER on the APSK transmission performance was studied. The APSK format has the trade-off between the performances of both the ASK signal and the PSK signal through the ER of the ASK signal. To overcome this issue, a method named zero-nulling method had been proposed, and this method solved the trade-off issue properly.

At first, the amendment is to modify the digital coherent receiver program, confirmed that the digital coherent receiver program can correctly resolve APSK signal. Second, in this master thesis, I set up a 500km long optical fiber to measure the transmission performance under APSK format, and try to use recirculating loop system to further increase the transmission distance to several thousand kilometers.

Finally, by further modify the receiver program to achieve APSK modulation of the zero-nulling method, and can prove its feasibility.
目次 Table of Contents
◎中文摘要.......................................................................................I
◎Abstract........................................................................................II
◎List of Contents.........................................................................III
Chapter 1 Introduction..................................................................1
1.1 Introduction of optical fiber communication......................1
1.2 Motivation.................................................................................2
1.3 Structure of this thesis...........................................................3

Chapter 2 Theoretical studies of the APSK format using digital coherent receiver...............................................................5
2.1 Introduction..............................................................................5
2.2 Theoretical studies of the APSK format.............................5
2.2.1 Amplitude and phase shift keying format.......................5
2.2.2 Extinction ratio......................................................................7
2.3 Zero-nulling method..............................................................8
2.4 Digital coherent receiver.......................................................9
2.4.1 Coherent detection scheme...........................................10
2.4.2 Digital coherent receiver..................................................12

Chapter 3 Experimental investigation of the APSK format..14
3.1 Introduction............................................................................14
3.2 Experimental setup..............................................................14
3.2.1 Transmitter.........................................................................15
3.2.2 Transmission line............................................................17
3.2.3 Receiver..............................................................................19
3.2.4 Recirculating loop.............................................................21
3.2.5 OSNR..................................................................................23
3.3 Results and discussions...................................................24
3.3.1 Performance of the APSK format...................................25
3.3.2 Performance of the long-haul transmission...............28
3.3.3 Source code.......................................................................29
3.3.4 Summary............................................................................29
Source code of MATLAB............................................................30

Chapter 4 Conclusions................................................................................33
List of abbreviations...................................................................35
參考文獻 References
References
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[13] H. Taga, J.-Y. Wu, W.-T. Shih, S.-S. Shu, “Numerical study of APSK format for long-haul transmission and its performance improvement by zero-nulling method,” Proc. 12th OptoElectronics and Communications Conference and 16th International Conference on Integrated Optics and Optical Fiber Communication (OECC/IOOC), Yokohama, Japan, 2007, Paper 12B1-5
[14] J.C. Rasmussen, T. Hoshida, H. Nakashima, FUJITSU Sci. Tech. J, 2010
[15] I. P. Kaminow, T. Li, A. E. Willner, Optical Fiber Telecommunications V B: systems and networks. (Academic, 2008)
[16] A. M. Yurek, P. G. Suchoski, S. W. Merritt, F. J. Leonberger, “COMMERCIAL LiNBO3 INTEGRATED OPTIC DEVICES,” Optics and Photonics News, Vol. 6 Issue 6, 1995
[17] C. Bungarzeanu, “Limitations of Dispersion Supported Transmission over Standard Single-Mode Fiber,” IEEE Photon. Technol. Lett., Vol. 6, No. 7, July, 1994
[18] “An Introduction to the Sampling Theorem,” National Semiconductor., Application Note 236, January, 1980
[19] N. Takachio, S. Norimatsu, K. Iwashita, “Optical PSK synchronous heterodyne detection transmission experiment using fiber chromatic dispersion equalization,” IEEE Photon. Technol. Lett., Vol. 4, No. 3, March, 1992
[20] R.-S. Chen, “Digital Coherent Receiver and Its Applications for Pilot Tone Transmission,” Department of Potonics National Sun Yat-sen University master thesis, July, 2009
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