臺灣博碩士論文加值系統

在一個理想的數位傳輸系統當中，其脈波上的每一個脈衝之間都會有個相同的時間間隔T (傳送速率的倒數)，也就是每一個脈衝都會準時地到達某理想的時間點上。然而實際的情形並非如此，在一組真實的脈波上，我們會發現相對於某理想的時間點其脈衝經常會有延遲或者超前的情形。而這種時間的誤差便被稱為時閃(timing jitter)。時閃根據其發生的原因可以簡單劃分為兩類：系統性時閃及非系統性時閃。前者所產生的原因是跟訊號以及電路系統有關，而後者主要導因於雜訊本身。一般而言，系統性時閃所導致的累積效應會大於非系統性時閃。
在現今高速傳輸的時代裡，光傳輸系統通常都在固定的傳送距離安置一個光放大器(optical amplifier)，一方面加強本身的訊號，另一方面藉由其中的時脈回復電路(clock recovery circuit, CRC)也可以重建其時脈以避免時閃效應傳至下一級甚至影響整個光傳輸系統。在論文當中，我們將提出一個新的CRC model來對訊號的時閃效應作精準地分析與探討。另一方面為了改善光傳輸系統的效率，我們也提出一個新的架構來設計繞射式光學元件(diffractive optical element, DOE)，並得到更佳的結果。

In an ideal digital transmission system, the pulse stream should consist of a sequence of points equally spaced in time by a quantity T, the inverse of the pulse transmission rate. In practice, the points of actual sequence are randomly deviated from their desired positions. Such timing deviations called timing jitter is usually classified into two main categories; systematic jitter and nonsystematic jitter. The former depends on the transmission signal, while the latter is produced by noise source. It has been verified that systematic jitter accumulation exceed nonsystematic one's.
Nowadays, very high bit rate optical systems use optical amplifiers to enhance the transmission signal and recover its timing. Therefore, the influence of clock recovery circuit (CRC) inaccuracies is very significant in optical communication systems since a small timing error may represent a high fraction of the bit period. In this thesis, we proposed a new CRC model that can be more powerful to analyze the jitter performance and get the better optical communication results. On the other hand, in order to improve the optical communication efficiency we also proposed a new method to design diffractive optical elements (DOEs).

Contents
1 Introduction 1
2 Jitter analysis in optical communication system 4
2.1 Proposed CRC model.......................................5
2.2 Concepts for jitter computation ........................7
2.3 Theoretical analysis.....................................9
2.4 Real analysis...........................................16
2.5 Discussions.............................................23
3 Diffractive optical element design .........................25
3.1 Introduction............................................25
3.2 Proposed Scheme.........................................29
3.3 Simulation Results......................................32
3.4 Conclusions.............................................36
4 Conclusions and Future Researches 37
A 38
A.1 Introduction............................................39
A.2 2PFIR Filter Design Algorithm...........................39
A.3 Conclusion..............................................43

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