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標題: | 高速紅/綠/紫光雷射二極體混白光光通訊系統 High-speed Red/Green/Violet Laser Diode Mixing White Light Communication System |
作者: | Wei-Chun Wang 王薇鈞 |
指導教授: | 林恭如(Gong-Ru Lin) |
關鍵字: | 可見光通訊,光無線通訊,白光照明, visible light communication (VLC),optical wireless communication (OWC),white-lighting, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 近年來,可提供高速資料傳輸率的可見光(波長範圍380~780 nm)通訊被視為具有發展性的通訊系統,藉由與現有的照明設備結合,可見光通訊可於智慧型辦公室中提供室內照明及高保密性的無線通訊。此外,即使在Wi-Fi無法應用的場所,如醫院、機艙及太空梭中,可見光通訊仍可透過無電磁波干擾的光訊號來提供無線上網。最初,因白光照明的考量,以發光二極體為光源所架構之可見光通訊被廣泛地提出,但此類系統的傳輸表現嚴重地受限於元件不足的調變頻寬。因此,具有較高亮度、較長同調距離及較高傳輸容量的雷射二極體被視為更理想的可見光通訊發送器。一般而言,白光可見光通訊系統可透過將藍光雷射二極體與螢光片結合,或是利用擴散片混合紅/綠/藍光二極體來架構。在此論文,波長為405奈米的紫光雷射二極體被應用於搭配上螢光片的白光通訊系統,以及混和紅/綠/紫光雷射二極體的白光通訊系統中以符合不同場所的應用。
首先,利用紫光雷射二極體激發摻雜硒化鎘量子點的螢光片,可提供高速無線通訊及室內白光照明的功能。雙波長的硒化鎘量子點摻雜的螢光片經雷射激發後可產生紅光與綠光的螢光,將螢光與穿透螢光片的紫光結合後,便可產生白光。此白光的相關色溫為6389 K,演色性指數為63.3,其色座標位於(0.3214, 0.2755),發散角則為127度。藉由直接調變加上螢光片後的紫光雷射二極體,此白光通訊系統可達到9.6 Gbit/s的資料傳輸率。 接著,利用紅/綠/紫光雷射二極體及黃光發光二極體所混成的白光通訊系統可提供高品質的白光照明及高速的無線通訊。藉由調變紅/綠/紫光雷射二極體,此波長多工的白光通訊系統可達到34.8 Gbit/s的高資料傳輸率。為了提供高演色性的白光,系統中加入黃光發光二極體以提供寬頻的黃橘色光,並且利用衰減值為OD 0.6的衰減片降低過高的紅光功率。加上衰減片後,此白光光源可提供28.4 Gbit/s的資料傳輸率,白光的相關色溫為4852 K,演色性指數為71.6,其色座標位於(0.3652, 0.4942),照度為6800 lx,發散角為60度。 Recently, visible light (wavelength ranging from 380 to 780 nm) communication (VLC) has been recognized as a promising technology to provide high-speed data communication. By integrating with the existing lighting facility, it can provide both indoor lighting and high-security wireless communication in the smart office. Besides, it can provide wireless communication through optical signal without electromagnetic interference in hospital, aircraft and space shuttle, where the traditional Wi-Fi is not available. Previously, VLC systems based on light-emitting diode (LED) have been widely reported due to its desirable lighting performance, yet the transmission performance was severely limited by its narrow modulation bandwidth. Accordingly, laser diode (LD) with higher brightness, longer coherent distance and larger transmission capacity has been considered as a more desirable transmitter toward high-speed VLC system. Typically, either using blue LD covered with a phosphorous film or mixing red/green/blue LDs by a diffuser, the high-speed white-light VLC system can be constructed. In this thesis, the violet LD (VLD) at 405 nm is employed in the CdSe-QD based white-lighting VLC and the red/green/violet (RGV) mixed white-lighting VLC systems to fulfill the requirement for various applications. First, a novel white-lighting VLC system based on the violet laser diode (VLD) adhered with the cadmium selenide (CdSe) quantum dots (QDs) doped polydimethylsiloxane (PDMS) film is exhibited for both high-speed communication and white-lighting. The CdSe-QD doped PDMS film is applied as the color converter to provide red and green fluorescence, and the white light is generated by mixing residual violet light with excited fluorescence. The proposed white light exhibits a correlated color temperature (CCT) of 6389 K, a color rendering index (CRI) of 63.3 and a Commission International del1’Eclairage (CIE) coordinate at (0.3214, 0.2755) with a divergent angle of 127 degree. By encoding the VLD with 16-quadrature amplitude modulation discrete multi-tone (16-QAM DMT) data, the white-lighting VLC system can support a data rate at 9.6 Gbit/s with a FEC demanded BER of 3.59×10-3. Afterwards, the VLC composed by red/green/violet (RGV) LDs and a yellow light emitting diode (Y-LED) diverged by a frost glass is proposed for both the indoor high-quality white-lighting and the high-speed communication. By respectively coding the RGV LDs with the filtered DMT data for wavelength division multiplexing (WDM) wireless communication, the high total data rate of 34.8 Gbit/s is achieved. To fulfill the demanded color rendering index (CRI) for indoor lighting, a Y-LED is utilized to contribute the broadband yellowish-orange light, and the optical density filter with an OD value of 0.6 is employed to attenuate the red laser light. With attenuation, the RGV-LD+Y-LED white-lighting VLC system can support a transmission data rate of 28.4 Gbit/s with a CCT of 4852 K, a high CRI of 71.6, the CIE coordinate at (0.3652, 0.4942), the illuminance of 6800 lx with a divergent angle of 60 degree. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/69420 |
DOI: | 10.6342/NTU201801293 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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