- 學位論文
高密度波長分工多工系統內鐘型化光纖光柵的應用與分析
Applications and Analysis of Apodized Fiber Gratings For Dense Wavelength-Division Multiplexing Fiber Communications
摘要
本研究主要著重在鐘型化光纖光柵應用於「高密度分波多工系統」(DWDM)系統中之最佳化模擬與分析。除了對均勻、漸變週期以及鐘型化光纖光柵的主要特性進行模擬與分析以外，對於DWDM系統，在通道間距為100、50及25 GHz的系統，以系統各別需求為前提，進行反向的鐘型化光纖光柵設計，其反射光譜寬度及旁模抑制比方面，均符合國際電信聯盟 ( ITU ) 的規定；本研究分別設計出具有112.8、84.2及53.1 dB等旁模抑制比之光柵，此良好特性光柵足供光纖通訊濾波之用。 此外，光訊號的時間群延遲振盪的幅度大小是影響高位元率通訊系統的一個關鍵因素。本研究發現一種新型鐘型化漸變光纖光柵（Apodized linearly chirped fiber Bragg gratings, ACFBG）可以最有效地補償前述振盪所引起的不良效應，以40 Gb/s光通訊系統為例，最佳脈波發散補償距離達140公里；光功率折損為0.3 dB、眼圖開闔比為10.0 dB、位元誤差率為3.53E-010及訊號脈寬回復率為1.6，都比目前光纖光柵有較佳的表現。
並列摘要
Characterization and analysis of apodized, including both uniform and chirped, fiber gratings were investigated in this work. For the optical filtering in the dense wavelength-division multiplexing (DWDM) systems, apodized gratings with different channel spacings of 100G, 50G, 25GHz were designed, using inverse processes, to meet the specific requirements set up by International Telecommunication Union. The best gratings obtained for the above channel spacings exhibit improved sidelobe suppressions of 112.8 dB, 84.2 dB, and 53.1 dB, in their Bragg reflectivity spectra, respectively. Moreover, it was found that the magnititude of time-delay variation of the optical signal pulse would strongly affect system performance, particularly for high-bit rate transmissions. A new sort of the apodized chirped fiber Bragg gratings (ACFBG) was found. This grating structure provided best dispersion compensation, compared to other work, resulting from the above time delay variation. Using this grating for dispersion compensation, take the 40Gb/s system for example, the best compensation distance is 140 km, power penalty is 0.3 dB, Eye-opening penalty is 10.0 dB, Bit error rate is 3.53E-10 and signal restoration rate is 1.6. To the best of our knowledge, this ACFBG can provide superior system performance to those of other work.
參考文獻
延伸閱讀
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