利用弱共振腔費比布洛雷射二極體於被動式分波多工光纖網路之研究

Abstract

本論文研製之弱共振腔費比布洛雷射二極體於被動式分波多工光纖網路系統，首先在可選擇的多通道傳輸上我們分析與展示側模注入鎖定費費比布洛雷射二極體，此外，我們使用直接調變方法的1%反射率的弱共振腔費比布洛雷射二極體在注入鎖定效能於2.5 千兆位元率與25公里傳輸討論與模擬了增強型注入鎖定頻寬的特性可達0.48奈米，此弱共振腔費比布洛雷射二極體可展示具有25個通道側模注入鎖定能力、鎖定範圍達30個奈米、最小注入光功率為-7分貝毫瓦、以及高於7分貝的增益消滅比。同時，藉由使用增益切換式同調脈衝串列以及閥值電流降低的方式，我們展示了寬增益頻譜的近似無色特性的被動式分波多工光纖網路光源，在溫度8度的改變與誤碼率低於10-10下接收靈敏度最多僅只差異1分貝，短線對傳的接收靈敏度可達-25.6分貝毫瓦，傳輸25公里光纖的接收靈敏度在全16個通道最高僅有2分貝的光率靈敏度損失。最後，藉由使用已整合的監控感光二極體，我們展示一種嶄新的注入鎖定費比布洛雷射二極體自動回復機制，這樣的架構可以有效地植入於網路備援系統中，於2.5 千兆位元率可達成的50秒內回覆Q值大於8.2以及側模抑制比達35分貝。這些研究將有助於未來的被動式分波多工光纖網路系統發展。

In this dissertation, we investigated the injection-locking wavelength-division-multiplexer passive optical network (WDM-PON) system. First, we introduced the side-mode injection-locked Fabry-Perot Laser Diode (FPLD) transmission diagnosis of a multi-channel selectable weak-resonant-cavity Fabry-Perot Laser Diode (WRC-FPLD). Moreover, the injection-locking performance of a 1% WRC-FPLD and demonstrate the 2.5-Gbit/s & 25-km WDM-PON application with the directly modulated WRC-FPLD based transmitter with enhanced injection-locking bandwidth of 0.48 nm was we discussed and simulated. A 25-channel locking capacity is reported for such a side-mode injection-locked WRC-FPLD with corresponding wavelength locking range of 30 nm, the minimal requested power of -7dBm and gain extinction ratio of <7 dB was demonstrated. Furthermore, we investigate quasi-color-free the WDM-PON transmitters with comparable broadband gain spectrum by using an optically gain-switching coherent pulse-train and threshold reduction of WRC-FPLDs. Nevertheless, such a degradation only induces a power penalty of < 1dB at BER<10-10 over changing temperature of 9 degree. A receiving sensitivity back-to-back transmission can be -25.6 dBm, and 25-km transmission power penalties is up to 2 dB with 16 channels. At last, we demonstrated a novel in situ self-restoration scheme to track real time the injection locking of a FPLD by monitoring a built-in integrated photodiode. Such a scheme can be effectively implemented with a minimum amount of redundant network resources to achieve self-restoration within 50 seconds with Q factor >8.2 and side-mode suppression ratio (SMSR) >35 dB at 2.5 Gbit/s. These investigations would be useful in the next generation injection-locking based WDM-PON systems.