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標題: | 被注入鎖模之弱共振腔法布里-珀羅雷射為無色光源之分波多工被動光網路特性分析 Analysis of ASE Injection-locked Colorless Weak-Resonant-Cavity FP-LD Based WDM-PON |
作者: | Tzu-Kang Cheng 程子剛 |
指導教授: | 林恭如 |
關鍵字: | 弱共振腔,分波多工系統,雷射,啁啾, WDM,FPLD,CHIRP, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 在超過1Gb/sec的頻寬彈性和容量條件下,應用分波多功器的被動光纖網路(DWDM-PON)在光纖到家的系統中,顯然是一個可行又相當便宜的方法。 為了降低DWDM-PON光網路系統的成本,已經有很多為了分波多功光網路的光源被提出來,如從光譜很寬的發光二極體、單模雷射、利用放大後的自發幅射光源(ASE)注入鎖模費比布洛雷射、雙相注入鎖模的反射性半導體光放大器等等。 儘管利用單模雷射可以使傳輸表現良好,但是因為應用在DWDM的單模雷射製造波長沒有辦法控制精準,並且相當昂貴,因此我們使用ASE注入FPLD的傳訊器為光網路單位(ONU),探討操作電流與微調溫度對這樣子的DWDM-PON系統。 本篇論文討論在200GHz頻寬的陣列波導分波多功器被動光網路系統中,以端面1%反射率的弱共振腔法布里-珀羅雷射(WRC-FPLD)為傳訊器,使用223-1 PRBS PATTERN直接調變622 Mbit/sec和 1.25 Gbit/sec,分析在不同操作電流和溫度下,受到自發幅射寬頻光源經過陣列波導濾波器(AWG)注入鎖模後WRC-FPLD的傳輸表現。 當電流從0.9倍閥值電流升高到1.4倍閥值電流時,誤碼率(BER)為10-9的接收功率可以減少9 dB。 而每隔6oC光譜受溫度影響被注入鎖模的個數會從兩個變成三個,如此的變化會影響系統的誤碼率,當接收的功率定為-27 dBm時,會因為不同的鎖模個數會使誤碼率從10-8 變成 10-10。 直接調變1.25 Gbit/sec WRC-FPLD時,系統使用200GHz和50GHz不同的AWG來測試如此會被溫度和鎖模個數影響的分波多功系統。 除此之外,我們亦討論在WRC-FPLD有不同被鎖模縱模數時的啁啾值,在AWG 200GHz的系統中,在被注入模數為兩個和三個時,啁啾參數分別是-1.6和2 MHz/ps,峰對峰值的啁啾分別為系-0.8和-1 GHz。系統的周啾值會隨著注入功率的大小而改變,隨者功率爭大啁啾值反而會下降。並且在WRC-FPLD被注入模數為三個時,會有比兩個縱模被鎖模時更高的啁啾值,而由不同鎖模數所引起的功率損耗在經過二十五公里的單模光纖傳輸將降低至0.1 dB以下。 而ASE輸入功率影響WRC-FPLD達到飽和增益的模型可以清楚的解釋WRC-FPLD表現的負啁啾值,而啁啾值跟系統的消光比有很大的關係。 利用ASE注入雷射達成無色操作時,光源的端面和連接面反射影像傳輸表現甚巨,只要在ONU端加上一個額外的AWG可有效降低反射,如此的系統在AWG頻寬為可以200GHz、誤碼率10-9時可以有-1.6 dB功率補償。 在一定的自發幅射功率注入下,不同的陣列波導頻寬會使半導體光放大器有不一樣的SMSR,另外,在誤碼率10-9時,從200GHz換成50GHz時會有1.5 dB的功率損耗。 In this thesis, we use amplified spontaneous emission injection-locked reflective semiconductor optical amplifier directly modulated at 622 Mbit/s and 1.25 Gbit/sec with detuning injection-locked mode for quasi-color-free transmission in DWDM-PON system with channel spacing of 200 GHz. With biased current changing from 0.9 Ith to 1.4 Ith, the improvement on receiving power sensitivity for the WRC-FPLD based WDM-PON transmitter is up to 9 dB at bit-error-rate (BER) of 10-9. Increasing the injection-locked mode number from 2 to 3 within temperature variation of 6oC effectively promotes the BER from 10-8 to 10-10 at receiving power of -27 dBm associated with a decreasing power penalty of -3.2 dB. In addition, ASE power and injection-locked mode number dependent frequency chirp and bit error rate responses of a weak-resonant-cavity Fabry-Perot laser diode (WRC-FPLD) transmitter in wavelength division multiplexing passive optical network are characterized. Chirp analysis of upstream data from the 1.25Gbit/s directly modulated WRC-FPLD with two or three injection-locked modes after the 200GHz AWG filtered ASE injection-locking is determined, which reveals the peak-to-peak chirps of -0.8 and -1 GHz with corresponding negative chirp parameters of -1.6 and -2 MHz/ps for two- and three-mode lasing WRC-FPLD, respectively. Such a negative chirp further enlarges to -6.4 and -9 GHz after 25-km single-mode fiber (SMF-28) transmission. The BER of below 10-9 at receiving power below –30 dBm is obtained with mode number dependent power penalty of <0.25 dB before and after 25 km SMF-28 transmission. A chirp model involved the ASE injection induced power saturation effect is derived to explain the negatively frequency chirped WRC-FPLD, which reveals a reverse trend with increasing ASE injection power due to the power-saturation induced on/off extinction ratio reduction (from 10.5 to 8.2 dB) and rising-time broadening (from 120 to 180 ps) on WRC-FPLD transmitted data shape, which effectively reduces the peak-to-peak chirp by at least 2 GHz after 25-km SMF transmission. Furthermore, the effect of AWG filter bandwidth on the transmission performances of the amplified spontaneous emission injection-locked Fabry-Perot laser diode based 1.25 Gbit/s direct modulated DWDM-PON transmitter, in which the DWDM AWG filter with two different channel spacings of 50 and 200 GHz for effectively raising network capacities and reducing the crosstalk induced by interfered reflection are compared. By filtering the ASE source with another 200 GHz AWG filter local ONU part, the AWG induced reflection is minimized to improve the upstream data with a negative power penalty of 1.6 dB. In contrast, the use of a 50 GHz channel-spaings AWG is unable to promote a better BER, where as leading to a power penalty of 1.5 dB for the back-to-back transmission case due to the slight increasing ratio of RIN noise to signal intensity are compared to the 200 GHz AWG based system. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42190 |
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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