結合光纖雷射與混合式極化/光分碼多工於無線光通訊之研究

Experimental Investigation of Fiber-Bragg-Grating Fiber Lasers and Hybrid PDM/OCDMA on Wireless Optical Communications

黃柏融(Bo-Rong Huang)

指導教授 ： 鄭旭志

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2015年)

https://doi.org/10.6827/NFU.2015.00062

摘要

本研究係採用一種基於頻譜振幅編碼之光分碼多重擷取(Spectral Amplitude Coding Optical Code Division Multiple Access,SAC OCDMA)的架構，並加入了極化多工(Polarization Division Multiplexing, PDM)的方式，使用者的編碼器與解碼器均以光纖布拉格光柵(Fiber Bragg Grating, FBG)完成，並以光纖布拉格光柵為基礎的並聯式多波長光纖雷射作為使用者的編碼器光源，在使用者編碼配置完成後，利用EOM加入不同的類比信號，並在自由空間(Free Space)中發送訊號，並用同一組路徑進行傳輸。
本研究的Free Space架構在一般常溫空氣介質下實現，該架構能將使用者訊號分成水平極化狀態(0°，180°)與垂直極化狀態(90°，270°)，並傳送到與使用者極化狀態相匹配的水平端解碼器或垂直端解碼器。在本研究中，加入極化多工的方式，即使使用者編碼字串重複也不會互相干擾，因此解碼端可以不受多個使用者所產生的多重擷取干擾(Multiple Access Interference, MAI)影響，這讓使用者訊號在解調時會有清晰的訊號頻率，此優點可以讓我們在編碼時有更靈活的配置與應用。

關鍵字

光纖雷射 ； 光分碼多工 ； 布拉格光纖光柵 ； 極化多工

並列摘要

This study adopted the architecture of spectral amplitude coding optical code division multiple access and polarization division multiplexing to capture the electric signal frequencies inputted into anelectrooptic modulator (EOM). The encoders and decoders of the users were designed by using fiber Bragg gratings (FBGs), with a FBG-based fiber laser as the light source for the encoder of the user. After the user encoding configuration was completed, an EOM was adopted to add various analog signals and transmit them in the same free space link to the decoder for capture.
The architecture of the free space in this study was realized in an air medium under normal atmospheric temperatures , this structure can divided user signals into a horizontal polarization state (0 °, 180 °) and the vertical polarization state (90 °, 270 °), and transmitted to the polarization state of the user matches the horizontal of the decoder or vertical of the decoder. In this study, by polarization division multiplexing , even if the user does not repeat encoded string interfere with each other, so the decoder can capture from multiple interference MAI impact, which allows users to have a clear signal when the signal frequency demodulation, this advantage allows us to have more flexible encoding configurations and applications.

並列關鍵字

OCDMA ； PDM ； FBG ； Fiber Laser

參考文獻

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