新穎訊號自我拍擊干擾消除技術應用於無間隙式直接檢測MIMO正交分頻極化多工系統

面對近十年來互動式電子產品的蓬勃發展而舊時代的傳輸技術在資訊傳輸量上明顯不足，在需要更多更快的資訊傳輸量的前提下各種提高品質與傳輸量的傳輸技術應運而生。而中短途通訊傳輸網路設計必須考慮到頻譜使用效率(Spectral efficiency, SE)與單位頻譜傳輸量，因此以數位訊號處理為基礎的正交分頻多工技術(Orthogonal Frequency Division Multiplexing, OFDM)成為目前中短途光網路傳輸中最廣泛使用的調變格式之一。正交分頻多工有著極高的頻譜使用效率且對於光纖色散與偏振模色散有相當高的對抗性，搭配直接偵測技術(Direct-Detection ,DD)下正交分頻多工也就是將載波同步與正交分頻多工訊號一同傳輸，可以在節省雷射震盪器與減少系統複雜度的情況下實現光傳輸正交分頻多工的傳輸調變。在目前利用極化多工系統成功實現多偏振態傳輸訊號並成功解調，利用偏振態正交達成多輸入多輸出(Multiple-input multiple-output ,MIMO)傳輸的極化多工(Polarization-division-multiplexing ,PDM)系統已得到了實現，但是直接傳輸正交分頻多工技術傳輸過程中載波與正交分頻多工訊號一同傳輸下造成的間隙(Gap)一直是個降低頻譜使用率的問題，在不保留間隙下使載波與正交分頻多工訊號一同傳輸，確實可以增加頻譜使用率但因訊號自我拍擊干擾影響會使得訊號雜訊比大幅度下降並降低訊號品質，而這對直接傳輸正交分頻多工系統而言一直是個必須克服的問題。因此本論文提出一個新穎的無間隙直接檢測式正交分頻極化多工(DD-PDM-OFDM)解調技術，接近無間隙下的訊號品質依舊維持相當水準並且成功將訊號解調，並應用到多偏振態上，在模擬的情況下成功在任何極化狀態(state of polarization, SOP)下順利傳輸並且解調成功，並且在實驗上成功驗證在沒有任何間隙之下錯誤率小於千分之一的情況下順利傳輸100公里光纖，並順利維持訊號品質與40Gbps的傳輸量，且沒有因為色散而造成任何系統的效能下降。

關鍵字

多輸入多輸出；極化多工；訊號自我拍擊干擾；載波錯頻；全光升頻；直接傳輸；極小間隙；雙邊帶傳輸

並列摘要

Because of the vigorous development of interactive electronic products over the past decade and transmission technology in the old era of information transmission capacity is obviously insufficient. In the context of the need for more and faster transmission of information to improve the quality and quantity of the various transmission capacity. The short-haul communication transmission network design must take into account the spectrum efficiency (SE) and the spectrum transmission unit volume, and therefore the digital signal processing based on an Orthogonal Frequency Division Multiplexing technology (OFDM) become one of the selection in the future network. Therefore, this paper proposes a novel technology without a gap direct detection type polarization orthogonal frequency division multiplexing (DD-PDM-OFDM) demodulation, signal quality under close without gaps still remain fairly level and success will signal demodulation, and application to a multi-polarization, in the case of simulation of success in any polarization state (state of polarization, SOP) under the transmission and demodulates success, and successfully validated experimentally in the absence of any bit error rate is less than one-thousandth under the circumstances the smooth transmission of 100 km optical fiber, and successfully maintain signal quality and transmission capacity of 40Gbps, and not because of the dispersion caused by the decrease in the effectiveness of any system.

並列關鍵字

MIMO ； Polarization-division-multiplexing ； SSBI ； Carrier Offset ； All Optical Up-Convert ； Direct Detection ； Gap Less ； DSB

參考文獻

[1] W. R. Peng, K. M. Feng, and A. E. Wilner, " Direct-Detected Polarization Division Multiplexed OFDM Systems with Self-Polarization Diversity,"

[3] A. A. Amin, H. Takahashi, I. Morita, and H. Tanaka, "100-Gb/s Direct-Detection OFDM Transmission on Independent Polarization Tributaries," Photonics Tech. Lett., Vol. 22, No. 7, pp 468-470, IEEE, 2010.

[5] D.-Z. Hsu, Chia-Chien Wei, Hsing-Yu Chen, Jyehong Chen, Maria C. Yuang, Shih-Hsuan Lin and Wei-Yuan Li “21 Gb/s after 100 km OFDM long-reach PON transmission using a cost-effective electro-absorption modulator,” Optics Express, Vol. 18 No. 26, pp 27758-27763, OSA, 2010

[6] B. J. C. Schmidt , Arthur James Lowery , and Jean Armstrong, “Experimental demonstrations of electronic dispersion compensation for long-haul transmission using direct-detection optical OFDM,” JTL,Vol. 26 No. 1,pp 196–203, OSA, 2008

[7] W.-R. Peng , Bo Zhang , Kai-Ming Feng , Xiaoxia Wu , “Spectrally efficient direct-detected OFDM transmission incorporating a tunable frequency gap and an iterative detection techniques”, JLT, Vol.27 No.24, pp 5723–5735 ,OSA , 2009

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新穎訊號自我拍擊干擾消除技術應用於無間隙式直接檢測MIMO正交分頻極化多工系統

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