【正文】 that optical power could not be reported. The failed OCM module will be investigated by Oplink WH Ramp。D group.Corrective Action更換高精度電容。 EDFA失效模式五a) 失效模式：Boot failure；b) 失效分析。FA Conclusion The boot failure was due to that the CCM image flash data of main and backup was damaged.Corrective Action Ramp。D group will release updated FW to fix this problem. EDFA失效模式六a) 失效模式：EDFA2 VCC_5V 與GND短路；b) 失效分析。FA ConclusionThe capacitor C173 short circuit caused E2OCM failure).Corrective Action ECOP36406 was issued on 04142011 for the replacement of the vcut process with stampholes for PCBA side cutting. EDFA的失效具體案例分析報(bào)告Failure Mode Analysis ReportEDFA ModuleFA Number: * Part Number:* Customer: * 1. Customer Claims S/N – *: module enters disable mode unpredictably.2. Product Information and Test Result Table 1 shows the product information.Table64 Product informationSNS/OSpec No.Mfg. LocationMfg. DateShip Date****** Figure 1 shows the schematic diagram of the product.Figure61 Schematic diagram Tested the module and verified all parameters met spec。 the RMA module could not duplicate “Disable mode” at normal operation condition unless the supply voltage lower than (designed protection voltage is ).Based on the results, pany could not confirm the customer claim.3. Failure Analysis Process We released a temporary firmware version to customer, this version print “PWR” through serial interface to show that module enter disable mode because of low voltage by mand MST. According to the information provided by customer, character string “PWR” was printed for sure when the failure reproduced as shown in Figure 2. Figure62 Character string “PWR” was printed After received the RMA module, inputting 2dBm optical power (the max input power specified in spec) to test the changes of module’s current and voltage when power on and power off. The results showed that there was no obvious overshoot and module didn’t enter in disable mode. As shown in figure 3 and figure 4. Red:Voltage Blue:Current Figure63 Power on @2dBm input optical powerRed:Voltage Blue:Current Figure64 Power off @2dBm input optical powerChanging optical power input from 2 to 12dBm and then from 12 to 2dBm, there were still no obvious overshoot as shown in figure 5 and figure 6。 at this period the module didn’t enter disable mode. Red:Voltage Blue:Current Figure65 Input power from 2dBm to 12dBmRed:Voltage Blue:CurrentFigure66 Input power from 12dBm to 2dBm Continual operation test at room/high temperature was conducted. When input 2dBm optical power and voltage of testingboard is , module continue operating for 5 hours at room temperature and for 75 hours at high temperature, module didn’t enter disable mode. In addition, we also tested critical voltage value of disable mode when input different optical power at room/high temperature as shown in table 2, our designed protection voltage is :Table65 Test results of critical voltageInput optical power/dBmHigh TemperatureRoom TemperatureVoltage of production/V Serial munication test: Inputting 2dBm optical power, tested COM port frequent munication. We didn’t find module entering disable mode because of low voltage. 4. FA ConclusionBased on the analyses above, It was concluded that the EDFA module entering disable mode in customer side maybe caused by lower supply voltage instantaneously.5. Corrective ActionRamp。D will update FW to reduce protection voltage to 4V, and module will enter to “DIS” mode until hundred times of sequentially monitoring of low voltage.（FA結(jié)束） 本章小結(jié)本章中，作者對(duì)EDFA的生產(chǎn)實(shí)際中遇到的各種失效模式進(jìn)行了分析研究，并針對(duì)其中一種模式的具體案例進(jìn)行了詳細(xì)的分析。7 EDFA發(fā)展趨勢(shì)及結(jié)論近年來(lái)，由于光纖通信的快速發(fā)展，各種各樣光器件得到人們的研究和探索。其中摻餌光纖放大器作為一種有源的光器件，結(jié)構(gòu)簡(jiǎn)單及其優(yōu)異性能，使其在光纖通信中得到廣泛的應(yīng)用。EDFA在通信領(lǐng)域的應(yīng)用主要是補(bǔ)償傳輸中的光纖損耗和超短光脈沖的能量放大器，根據(jù)其在系統(tǒng)中的位置及作用，常分成以下三種類(lèi)型:功率放大器、線路放大器和前置放大器三種。當(dāng)EDFA放大超短光脈沖時(shí)，非線性效應(yīng)成為影響光脈沖能否順利傳輸?shù)闹匾蛩?，所以急需解決這個(gè)問(wèn)題。下面介紹本論文的一些主要工作:a) 介紹了光在脈沖常規(guī)光纖傳輸?shù)南嚓P(guān)理論及特性，給出了光纖中光場(chǎng)的數(shù)值理論模型。b) 系統(tǒng)地介紹了EDFA的基本結(jié)構(gòu)及組成器件，描述它在光纖通信系統(tǒng)中的應(yīng)用特點(diǎn)及優(yōu)勢(shì)；c) 從EDFA的產(chǎn)生、發(fā)展、機(jī)理、組態(tài)等方面的分析研究EDFA技術(shù)；d) 從系統(tǒng)組成、數(shù)學(xué)模型等方面，分析研究了EDFA系統(tǒng)；e) 從系統(tǒng)硬件的設(shè)計(jì)等方面介紹EDFA監(jiān)控系統(tǒng)的設(shè)計(jì)。f) 對(duì)EDFA的生產(chǎn)實(shí)際中遇到的各種失效模式進(jìn)行了分析研究，并針對(duì)其中一種模式的具體案例進(jìn)行了詳細(xì)的分析。致 謝時(shí)間如梭，轉(zhuǎn)眼大學(xué)四年的時(shí)光已接近尾聲，這篇論文是我作為大學(xué)生的匯報(bào)之作，在畢設(shè)的過(guò)程中，我得到了很多老師和同學(xué)的幫助，在此衷心的感謝他們。首先向?qū)熗趺鱾ダ蠋熤乱猿绺叩木匆夂椭孕牡母兄x。王老師以其淵博的知識(shí)、正直誠(chéng)信的品格，嚴(yán)謹(jǐn)?shù)膶W(xué)風(fēng)影響著我，不僅在學(xué)業(yè)上對(duì)我悉心指導(dǎo)，而且在為人處事方面也給予我指導(dǎo)，給我以后步入社會(huì)提供了很多的經(jīng)驗(yàn)。同時(shí)王老師在學(xué)術(shù)上學(xué)風(fēng)嚴(yán)謹(jǐn)、視野開(kāi)闊，在整個(gè)論文研究期間，我始終得到了王老師的諄諄教誨和卓有成效的指導(dǎo)。在王老師的辛勤指導(dǎo)下，我的論文得到順利完成，可以說(shuō)我所取得的每一點(diǎn)成績(jī)都與王老師的精心指導(dǎo)分不開(kāi)的，他將永遠(yuǎn)是我學(xué)習(xí)的榜樣!在畢業(yè)設(shè)計(jì)的過(guò)程中，同學(xué)們也給了我很大的幫助，因?yàn)槲以谕鈱?shí)習(xí)的原因，很多事情都需要他們幫忙，在此向他們表示感謝！最后借此機(jī)會(huì)，向大學(xué)四年幫助我的恩師，張玉杰、馬令坤、兀旦輝、王明偉、郭文強(qiáng)、楊帆、李秦君、楊萍等老師，和幫助過(guò)我的摯友，莫少豪、李超、張曉偉、陳爍星、徐相光、趙凡、楊斌、夏令君、王粉瑩等表示衷心的感謝。參 考 文 獻(xiàn)[1] Leonid,Kazovsky,Sergio,Benedetto,Alan, Communication Systems. America: Artech House,2001:251275. [2] [M].北京：高等教育出版社,1999:274279.[3] [M].北京：電子工業(yè)出版社,2000．[4] [J].有線電視技術(shù),2005.[5] 樓棋洪,周軍,[J].中國(guó)激光,2003.[6] 樓棋洪,周軍,[J].中國(guó)激光,2003.[7] 閻平,鞏馬理,[J].中國(guó)激光，2005.[8] 呂福云,樊亞仙,[J].中國(guó)激光,2002:888.[9] [M].北京:電子工業(yè)出版社,1997. [10] 楊青,俞本立,[J].光電子技術(shù)與信息,2002: 1318.[11] [M].北京:科學(xué)出版社,2004.[12] [M].北京:國(guó)防工業(yè)出版社,2004.[13] [M].北京:國(guó)防工業(yè)出版社,2000.[14] [M].北京:北京郵電大學(xué)出版社,2001.[15] 、特性及其應(yīng)用「J].光通信技術(shù),1995,19(2): 4249.[16] [J].廣東通信技術(shù),1999,19(2):3839.