本論文提出一個雙向光纖同時傳輸WiMAX訊號及NRZ訊號之架構，目的是希望利用原有光纖網路架構傳輸，還額外提供無線傳輸服務，藉此擴展涵蓋範圍及覆蓋率。利用電致吸收調變器的波長相依特性，將C波段加L波段的光源同時注入電致吸收調變器，C波段吸收調變較佳，當作下行光訊號傳輸；L波段吸收調變較差，當作上行光訊號再次調變，與利用反射式半導體光放大器的非線性增益特性，使工作在增益飽和區，可有效壓抑殘餘調變訊號的干擾。實現同時雙向整合無線及有線訊號上載被動光纖網路。
在此設計架構下，可達成下行傳輸頻寬5 MHz於頻段2.665 GHz WiMAX訊號及速率1.25 Gbps數位NRZ訊號，上行一樣傳輸頻寬5 MHz於頻段2.675 GHz WiMAX訊號及速率1.25 Gbps數位NRZ訊號之雙向整合無線及有線訊號上載被動光纖網路。另外我們還以實驗量測證實，同時載送無線及有線訊號可以有效降低雷利散射影響，提升無線EVM品質。

This research demonstrates a simultaneous bidirectional WiMAX and NRZ signal over WDM-PON system design. The purpose is to use the existing fiber-optic transmission network architecture, but also provide an additional wireless transmission services to expand the scope and coverage network capacity by employing the wavelength dependent characteristics of electroabsorption modulator (EAM). When the C-band and L-band light source are injected into the EAM, C-band absorption modulator is better, as a downstream optical signal transmission. However, L-band absorption modulator is poor as the uplink modulated optical signal. So, we can utilize a reflective semiconductor optical amplifier (RSOA) nonlinear gain characteristics to work in the gain saturation, which can effectively suppress the residual interference signal modulation.
The system can achieve 5 MHz bandwidth WiMAX data with 2.665 GHz carrier frequency and 1.25 Gbps digital NRZ transmission for downstream transmission and also 5 MHz bandwidth WiMAX data with 2.675 GHz carrier frequency and 1.25 Gbps digital NRZ transmission for upstream signal. From these results, we have proved that simultaneous bidirectional WiMAX and NRZ signal over WDM-PON system can reduce a Rayleigh Back-Scattering efficiently and improve the EVM quality of wireless.

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