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標題: | 雙模無色雷射二極體產生毫米波整合被動光纖網路與無線通信系統 Dual-Mode Colorless Laser Diode for Hybrid Optical Wired and MMW Wireless Communications |
作者: | Hsiang-Yu Chen 陳翔昱 |
指導教授: | 林恭如 |
關鍵字: | 毫米波,注入鎖定,無色法布里-珀羅雷射,高密度分波多工被動光纖網路,無線通信系統, millimeter wave (MMW),injection-locking,colorless Fabry-Perot laser diode (FPLD),dense wavelength division multiplexed passive optical network (DWDM-PON),Wireless communication system, |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 針對當前網路傳輸容量需求的日益增加,分別將以毫米波頻段28及47 GHz尚有之未分配頻寬,分別對次世代無線區域接取網路(WLAN)與衛星通信系統(VSAT) 進行持續性開發,因此,本論文亦將在低系統成本與高傳輸容量考量下,於頭端利用雙模無色雷射二極體直調正交分頻多工(OFDM)之正交振幅調制(QAM)調變格式,並於遠端節點拍頻產生28或47 GHz毫米波以進行自由空間傳輸,藉此整合被動光纖網路與無線通信系統。
首先,在高密度分波多工(DWDM)被動光纖網路中,我們使用一顆主無色費比布洛雷射(colorless FPLD),經放大濾波後單模注入鎖定從無色費比布洛雷射,同時該從無色費比布洛雷射被直接調變以24 Gb/s之64-QAM OFDM基頻訊號,並在經過25公里單模光纖傳輸後至用戶端;另一方面,雖然使用雙模注入架構時,降低基頻訊號傳輸容量至18 Gb/s,但該雙模光載波可於遠端節點拍頻產生47.7-GHz之毫米波,背靠背無線傳輸2 Gb/s訊號,經降頻後訊號品質可通過前向錯誤修正碼之判斷準則。 在前述工作中,雙模注入架構訊號劣化之原因主要為當雙模注入源之波長差與從無色費比布洛雷射之模間距相等時,其產生之四波混頻模態功率會被雷射共振腔放大至-20和-26 dBm,因此增加光纖色散的影響,使基頻訊號劣化,因此,若挑選腔長為900 μm之主無色費比布洛雷射與腔長為600 μm之從無色費比布洛雷射,則可使四波混頻模態偏離雷射共振模態,進而降低其功率至-31和-35 dBm,此架構成功使18-Gb/s基頻傳輸訊號之雜訊比(SNR)由19.7 dB提升至24 dB,並在25公里單模光纖傳輸後達成2-Gb/s之1.6公尺無線傳輸。 最後,由於雙模注入無色費比布洛雷射架構並無法完全抑制四波混頻模態,因此我們採用單模注入架構來整合全雙工雙向被動光纖網路與無線通信系統。在頭端以單波長光源經由非線性調變之馬詹德調變器(MZM)產生中心載波抑制之雙邊帶(CCS-DSB)載波,其中一邊帶載波注入鎖定下行無色費比布洛雷射,並直調以36Gb/s之64-QAM OFDM基頻訊號,接著與另一邊帶載波耦合並傳輸25公里之單模光纖,相較於雙模注入系統其訊號SNR將可由20.6 dB提升至21.5 dB。並仍可在遠端節點拍頻產生28-GHz毫米波載波,成功在自由空間距離為1.6公尺下傳輸4-Gb/s 16-QAM OFDM訊號,並可由理論預估其最遠之無線傳輸距離為4.25公尺,而當無線傳輸距離低於1.6公尺時,可提升傳輸容量至6 Gb/s。此外,在上行傳輸測試中,利用不帶訊號之邊帶載波來注入鎖定上行無色費比布洛雷射,在25公里單模光纖傳輸後達最大傳輸容量為36 Gb/s。證實無色費比布洛雷射在全雙工雙向被動光纖網路整合無線通信系統,有高速且低成本之優勢。 In this thesis, three colorless Febry-Perot laser diodes (FPLD) with same front-facet reflectance of 1% and different cavity lengths of 900 and 600 μm which enables to provide a wide gain spectrum with dense longitudinal-modes were proposed for millimeter-wave (MMW) generation in a dense wavelength-division-multiplexed passive optical network (DWDM-PON). Therein, a heterodyne technique and an optical injection-locking technique are used to beat the MMW carrier and to demonstrate dual-wavelength control for the colorless FPLDs. Firstly, a remote heterodyne MMW carrier at 47 GHz over fiber synthesized with the master-to-slave injected dual-mode colorless FPLD pair is proposed, which enables the future connection between the wired fiber-optic 64-QAM OFDM-PON at 18 Gb/s with the MMW 4-QAM OFDM wireless network at 2 Gb/s. The dual-mode master-to-slave injection-locked colorless FPLD pair with amplified and unfiltered master can transmit 64-QAM OFDM data at 18 Gb/s over 25-km SMF to provide EVM, SNR and BER of 8.2%, 21.8 dB and 2.2×10-3, respectively. Furthermore, the 47-GHz MMW carrier remotely beat from the dual-mode master-to-slave injection-locked colorless FPLD pair exhibits an extremely narrow bandwidth of only 0.48 MHz. After frequency down-conversion operation, the MMW carrier successfully delivers 4-QAM OFDM data up to 2 Gb/s with EVM, SNR and BER of 33.5%, 9.51 dB and 1.4×10-3, respectively and passes the BER for 7% FEC criterion of 3.8×10-3. Moreover, a four-wave-mixing (FWM) suppressed dual-mode master-to-slave colorless FPLD pair for MMW-PON is applied to integrate fiber-wired and MMW wireless networks, which is contributed by shifting the FWM modes away from the cavity mode to avoid the enhancement induced by the cavity resonance. The mode-deviated injection with 600-μm slave colorless FPLD successfully suppresses the FWM modes to -31 and -35 dBm, which performs the 18-Gb/s 4-QAM OFDM data with EVM, SNR and BER of 6.3%, 24 dB and 1.6×10-4, respectively. In addition, the 47-GHz MMW remotely beat by the 600-μm slave transmits the passband 2-Gb/s 4-QAM OFDM data with EVM, SNR and BER of 37.4%, 8.6 dB and 3.7×10-3, respectively, after 10-km SMF transmission and BTB free-space transmission. For the maximum transmission distance of 1.6 m, the 600-μm slave reveals lower chromatic dispersion in SMF than the 750-μm slave, which facilitates the wireless transmission with corresponding EVM, SNR and BER of 36.3%, 8.8 dB and 2.9×10-3, respectively, after 25-km SMF. Finally, an adjacent channel beating with recombined dual-mode colorless FPLD for full-duplex MMW-DWDM-PON is demonstrated to transmit 36-Gb/s 64-QAM OFDM data over a 25-km SMF and deliver a 28-GHz MMW carrier using the optically heterodyne detection for further wireless 6-Gb/s 16-QAM OFDM data transmission. It delivered optical baseband 36-Gb/s data exhibits EVM, SNR and BER of 8.4%, 21.5 dB and 2.7×10-3, respectively, which is better than the dual-mode injection-locking colorless FPLD does. In a hybrid 25-km fiber-wired and 1.6-m wireless link, it successfully transmits 4-Gb/s 16-QAM OFDM data, and a maximal wireless transmission distance of 4.25 m can be theoretically estimated under the FEC criterion. On the other hand, with fixing the free-space distance at 1.6 m, the data rate can also be increased to 6 Gb/s with EVM, SNR and BER of 16.0%, 15.9 dB and 1.9×10-3, respectively. For upstream 25-km SMF transmission, the 36-Gb/s 64-QAM OFDM data is also directly encoded onto the upstream colorless FPLD injection-locked by using the adjacent pure carrier. It represents an EVM of 8.5%, an average SNR of 21.4 dB and a BER of 2.9×10-3. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52777 |
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顯示於系所單位: | 光電工程學研究所 |
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