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標題: | 以自迴授光電振盪回路啟動無源歸零載波高密度分波多工二相位移鍵控與開關鍵控通訊技術 DWDM BPSK and OOK Communication with Clock-Free RZ Carriers Self-Started by Feedback Optoelectronic Oscillator |
作者: | Yu-Chieh Chi 紀裕傑 |
指導教授: | 林恭如(Gong-Ru Lin) |
關鍵字: | 自啟動光電振盪回路,增益切換,電吸收調變器,諧波鎖模,半導體光放大器光纖雷射,歸零二相移相鍵控,歸零開關鍵控,Mach-Zehnder強度調變器,光分時多工,高密度分波多工, self-starting optoelectronic oscillator,gain-switching,electro-absorption modulator,harmonic mode-locking,semiconductor optical amplifier fiber laser,return-to-zero binary phase-shift keying,return-to-zero on-off-keying,Mach-Zehnder intensity modulator,optical time-division multiplexing,dense wavelength division multiplexing, |
出版年 : | 2012 |
學位: | 博士 |
摘要: | 自啟動光電振盪回路,由於其能以無須傳統微波訊號源方式同時產生高重複率之微波電訊號與低時基誤差之歸零光脈衝,因此在高速光分時多工傳輸系統中將扮演極為重要角色。本論文主要為探討利用自迴授光電振盪回路啟動無源歸零載波建構高密度分波多工二相位移鍵控與開關鍵控通訊系統。首先,我們分別利用直調增益切換操作之自迴授法布里-玻羅雷射二極體及分佈反饋式雷射二極體來建構無須傳統微波訊號源之10-Gbit/s歸零開關鍵控,藉由微波電訊號在此光電振盪回路中不斷地放大及濾波後的調變,傳統TO-56 can封裝雷射二極體之調變頻寬將可被至少提升至產生重複率為10-GHz之歸零光脈衝。接著針對外調方式,利用自迴授積體化分佈反饋雷射二極體-電吸收調變器以及非線性操作電吸收調變器注入之諧波鎖模半導體光放大器光纖雷射來分別建構單通道與多通道無傳統微波訊號源之10-GHz歸零光脈衝載波、微波電訊號以及歸零二相移相鍵控/開關鍵控,其自啟動非線性操作電吸收調變器與注入諧波鎖模半導體光放大器光纖雷射之理論模型也被以數學方式進行討論以最佳化輸出之歸零光脈衝載波,也同時以理論及實驗方式驗證自迴授光電振盪回路內光纖長度對輸出歸零光載波之時基誤差及微波電訊號之相位雜訊的最佳化。此外針對以此自迴授光電振盪回路所產生之歸零二相移相鍵控,探討了當微調二相移相鍵控解調變器解調窗口來配合歸零二相移相鍵控頻率間隔時之系統傳輸品質。
接著,我們比較自啟動增益切換操作分佈反饋式雷射二極體、非線性操作電吸收調變器及注入諧波鎖模半導體光放大器光纖雷射三種方式產生歸零光脈衝載波驅動之無傳統微波訊號源歸零開關鍵控,可發現由於自啟動增益切換操作分佈反饋式雷射二極體需將雷射設置在臨界操作條件,因此會產生相當強之相對強度雜訊並進一步劣化傳輸訊雜比,因此並不適用於產生無傳統微波訊號源之歸零開關鍵控。此外,雖然自啟動注入諧波鎖模半導體光放大器光纖雷射能同時產生4-6個高密度分波多工通道間距之10-GHz歸零光脈衝,但其脈衝品質會因為在注入過程中不足的調變深度及通道化過程減少鎖模成分而劣化,因此在以上三種產生無傳統微波訊號源之歸零光脈衝的方法中,以自啟動非線性操作電吸收調變器產生之歸零光脈衝載波/開關鍵控具有較佳之時基誤差、脈衝寬、消光比、訊雜比及傳輸品質。此自啟動非線性操作電吸收調變器將為未來之混合式高速率光分時多工與高密度分波多工存取網路提供一個嶄新的選項來產生無傳統微波訊號源之10-GHz歸零光脈衝載波/微波電訊號/歸零二相移相鍵控與開關鍵控。接著在傳輸網路應用方面,我們在頭端分別利用積體化分佈反饋雷射二極體-電吸收調變器及非線性操作Mach-Zehnder強度調變器為基底建構自啟動光電震盪回路產生10及40-GHz之歸零光脈衝,並進而產生無須傳統微波訊號源之10及40-Gbit/s 歸零二相移相鍵控以進行下行傳輸。接著,在光網路單元端再利用其下行歸零光脈衝載波以進行強度調變,並利用產生之歸零開關鍵控進行上行傳輸,便可分別建構無須傳統微波訊號源之10 及40-Gbit/s雙向歸零二相移相鍵控/開關鍵控傳輸。本論文成功探索出自啟動光電振盪回路新應用在於產生無須傳統微波訊號源之歸零二相移相鍵控/開關鍵控,並進一步將其拓展至網路系統應用,即是在於以無傳統微波訊號源方式建構下行二相移相鍵控與上行再利用歸零開關鍵控之混合式高速率光分時多工與高密度分波多工存取網路。 The self-starting optoelectronic oscillator (OEO) simultaneous generating synthesizer-free microwave clock and pulsed carrier with ultra low jitter at high-repetition-rate have emerged as a key component for the high-bit-rate optical time-division multiplexing (OTDM) communication system. In this dissertation, the synthesizer-free 10 and 40-GHz return-to-zero (RZ) carriers self-started by the feedback OEO for dense wavelength division multiplexing (DWDM) access network with 10 and 40-Gbit/s down-stream RZ binary phase-shift keying (BPSK) and reused up-stream RZ on-off-keying (RZ-OOK) data is demonstrated respectively. First, a synthesizer-free 10-Gbit/s RZ-OOK data generator is demonstrated by gain-switching a Fabry-Perot laser diode (FPLD) or a distributed feedback laser diode (DFBLD) with the same self-started OEO feedback loop. By self-feedback triggering the microwave clock with the OEO, the modulation bandwidth of the transistor outline (TO-56) can packaged laser diode can be self-pulsating to generate optical RZ carrier at 10-GHz repetition rate. In the external modulation scheme, the synthesizer-free self-starting optoelectronic oscillating pulsator based single- and multi-channel optical RZ carrier, microwave clock and data (OOK and BPSK) generator are demonstrated by using an integrated DFBLD and electro-absorption modulator (DFBLD-EAM) link and a injection mode-locked semiconductor optical amplifier fiber laser (SOAFL) respectively. Moreover, the theoretical models of the self-pulsating EAM and the injection mode-locking SOAFL are numerically analyzed respectively to improve the self-pulsating performance of the optical RZ carriers. The jitter of the self-started RZ carrier optimized with the true-time-delay incorporated OEO feedback loop with lowest single sideband (SSB) phase noise is also theoretically and experimentally performed. For synthesizer-free RZ-BPSK data, detuning the Delayed interferometer DC bias to match the frequency comb spacing with the RZ carrier frequency further improves the transmission performance. Subsequently, the distinguished transmission performances of the 10-Gbit/s RZ-OOK data carried on the gain-switched DFBLD, the nonlinearly modulated EAM, and the injection mode-locked SOAFL pulse-train triggered with the self-feedback OEO are compared. The OEO driven gain-switching DFBLD with insufficient pulse extinction is not particularly suitable for RZ data generation owing to its intense relative intensity noise (RIN) and large timing jitter under threshold operation. In addition, although the self-pulsated harmonic mode-locking SOAFL can simultaneously generate 4-6 DWDM-channel RZ carriers, the self-pulsated RZ carrier/data generated from DFBLD under the OEO-triggered nonlinear-EAM modulation still have the better performances in many aspects such as jitter, pulsewidth, pulse on/off extinction ratio (ER), and signal-to-noise ratio (SNR) because of the sufficient modulating amplitude. Such an integrated DFBLD-EAM link based self-starting OEO is a new approach for the synthesizer-free optical clock and RZ-OOK/BPSK data generation. Finally, the self-started 10 and 40-GHz DFBLD-EAM and Mach-Zehnder intensity modulator (MZM) RZ carriers are performed to demonstrate bi-directional down-stream RZ-BPSK and up-stream re-used RZ-OOK transmissions at 10 and 40 Gbit/s respectively. This study explores the new application of an OEO self-pulsated RZ carrier in further hybrid BPSK-OOK transmission network and its reusing capability. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65526 |
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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