基于6.4tbits傳輸系統(tǒng)的光碼分復(fù)用技術(shù)研究

1、華中科技大學(xué)碩士學(xué)位論文基于6.4Tbit/s傳輸系統(tǒng)的光碼分復(fù)用技術(shù)研究姓名：艾興芳申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：物理電子學(xué)指導(dǎo)教師：元秀華20040623IIABSTRACT Optical code division multiplexing(OCDM) is receiving more and more attention recently. Optical channel multiplexing and demultiplexi

2、ng can be achieved through optical encode and matched optical decode. Many different channels share same time slot and same wavelength band , which can improve spectral efficiency. Combinating OCDM with wave

3、length division multiplexing(WDM), transmission rate can be improved greatly. OCDM is promising in future all optical communication. Supported by National High Technology Research and Development Program of Chin

4、a(863 Program- 2 0 0 2 A A 1 2 2 0 3 5 ) , this paper presents the theoretical and experimental research on quarternary phase shift key(QPSK) OCDM. The main contents are given as follows: (1) The research backgrou

5、nd and signification of OCDM is introduced. The primary technical solutions for OCDM are reviewed. According to the Program, a new OCDM technology of QPSK coherent phase encoding in time domain is considered t

6、o be studied. (2) The design principle of the encoder/decoder and the design of the address codes usually to be used are analyzed. The conclusion that bipolar coherent OCDM is superior to unipolar noncoh

7、erent OCDM is drawn through the performance compare of both. (3) The performance of quarternary bipolar code is superior to that of binary bipolar code according to Welch’s well- known lower bound

8、s on complex sequence. The theory of quarternary bipolar code based on Family A is researched and the method of generating period quarternary bipolar codes with quarternary shift register is given. The perform

9、ance of period quarternary bipolar codes based on Family A is compared with that of binary bipolar codes usually to be used. (4) QPSK coherent OCDM in time domain of code length 3 is proposed. The peri

10、od quarternary bipolar codes of code length 3 and code capacity 5 are generated with quarternary shift register. On the other hand, four aperiodic quarternary bipolar codes of better correlatio