【正文】 本科畢業(yè)設(shè)計(jì)論文 1 摘 要 直接調(diào)制光發(fā)射機(jī)能完成對(duì)電信號(hào)的處理，其功能是把電脈沖信號(hào)變成光脈沖信號(hào)。本文先介紹了光纖通信的發(fā)展背景，光纖相對(duì)于傳統(tǒng)銅導(dǎo)線的優(yōu)越性，以及光纖通信未來的發(fā)展。在第二章中對(duì)光纖通信中的光源進(jìn)行了介紹，其中包括 LED發(fā)光二極管與 LD半導(dǎo)體激光器，詳細(xì)說明了結(jié)構(gòu)、發(fā)光機(jī)理、 PI特性、光譜特性、調(diào)制特性等工作特性。簡(jiǎn)單介紹 LD組件，并說明它在現(xiàn)代已大規(guī)模商用化，是目前的主流應(yīng)用形式。在后一章中對(duì) LED和 LD光發(fā)射機(jī)進(jìn)行詳細(xì)設(shè)計(jì)，首先設(shè)計(jì)了 LED光發(fā)射電路，然后深入研究更為復(fù)雜的 LD激光器調(diào)制電路，在對(duì)其進(jìn)行了簡(jiǎn)單介紹后，說明了自動(dòng)溫度控制電路和自動(dòng)功率控制電路在 LD調(diào)制電路中的重要性，然后再對(duì)這兩種電路進(jìn)行了設(shè)計(jì)。下一章中，首先對(duì)Multisim這一應(yīng)用廣泛的電子仿真軟件進(jìn)行介紹，并在 Multisim 13中對(duì)上面所有電路進(jìn)行仿真，獲得各個(gè)電路中相關(guān)元器件的參數(shù)，并給出仿真結(jié)果。最后 ，再學(xué)習(xí) Altium Designer印制電路 板軟件的使用， 并對(duì) LD組件及外圍電路 進(jìn)行印制電路板的 制作 。 關(guān)鍵詞 ： LED 光發(fā)射機(jī)， LD 光發(fā)射機(jī)， LD 組件，自動(dòng)溫度控制電路，自動(dòng)功率控制電路 本科畢業(yè)設(shè)計(jì)論文 2 ABSTRACT Directly modulated optical transmitter is to acplish the processing of the electrical signal, and its function is to transform the electrical pulse signals into the optical pulse signal. This paper first describes the development of optical fiber munication background, superiority of the fiber with respect to the conventional copper wires and future development of optical fiber munication. In the second chapter, it introduces the sources of the optical fiber munication, including lightemitting diodes(LED) and laser diode(LD). It details the operating characteristics as the structure and luminescence mechanism, PI characteristics, spectral characteristics and modulation characteristics. Then this article briefly introduces the LD ponent, indicating that it has a largescale mercialization in modern times and is the mainstream application form. In the next chapter, it detailed designs LED and LD optical transmitter. First, the lightemitting LED circuit was designed. Then it deep studys more plex laser modulation circuit. After a brief introduction, it introduces the importance of automatic temperature control circuit and the automatic power control circuit of the LD modulation circuit. Then it designs these two circuits. In the next chapter, it firstly introduces the application of a wide range of electronic Multisim simulation software, then simulates all the circuit in Multisim 13,accessing to related ponents parameters in various circuit and giving simulation results. Finally, learn how to use Altium Designer software for printed circuit boards, then make printed circuit board for LD ponents and peripheral circuits. KEY WORDS： LD optical transmitter, LD ponents, automatic temperature control circuit, automatic power control circuit 本科畢業(yè)設(shè)計(jì)論文 3 目 錄 摘 要 .............................................................................................................................. 1 ABSTRACT ................................................................................................................... 2 目錄 ................................................................................................................................ 3 第一章 緒論 ................................................................................................................ 5 光纖通信系統(tǒng) .................................................................................................. 5 光纖通信應(yīng)用現(xiàn)狀和發(fā)展前景 ...................................................................... 6 本文研究的主要內(nèi)容 ...................................................................................... 6 第二章 光源器件的介紹 .............................................................................................. 7 半導(dǎo)體發(fā)光二極管（ LED） .......................................................................... 7 LED 的結(jié)構(gòu) ............................................................................................ 8 發(fā)光二極管 (LED)的工作特性 ............................................................. 9 半導(dǎo)體激光器 (LD)........................................................................................ 11 粒子數(shù)反轉(zhuǎn)與光增益 ........................................................................... 11 光學(xué)諧振腔與激光器的閾值條件 ....................................................... 13 激光器的結(jié)構(gòu) ....................................................................................... 15 半導(dǎo)體激光器的特性 .......................................................................... 16 LD 激光器組件 ............................................................................................. 18 第三章 光發(fā)射機(jī)的設(shè)計(jì) ............................................................................................ 19 LED 光發(fā)射機(jī)的設(shè)計(jì) ................................................................................... 19 LD 光發(fā)射機(jī)的設(shè)計(jì) ..................................................................................... 21 LD 組件 ................................................................................................ 21 光源驅(qū)動(dòng)電路的設(shè)計(jì)........................................................................... 22 自動(dòng)溫度控制電路（ ATC）............................................................... 24 自動(dòng)功率控制電路（ APC） ............................................................... 25 第四章 光發(fā)射機(jī)的仿真 ............................................................................................ 27 仿真軟件 NI Multisim的介紹 ..................................................................... 27 LED 光發(fā)射機(jī)的仿真 ................................................................................... 27 LD 主驅(qū)動(dòng)電路的仿真 ................................................................................. 30 LD 自動(dòng)溫度控制電路 的仿真 ..................................................................... 32 LD 自動(dòng)功率控制電路的仿真 ..................................................................... 33 本科畢業(yè)設(shè)計(jì)論文 4 第五章 LD 光發(fā)射機(jī)電路的 PCB 板制作 ................................................................ 36 印制電路板制作軟件 Altium Designer 的介紹 .......................................... 36 LD 組件電路 PCB 板的制作 ........................................................................ 36 參考文獻(xiàn) ...................................................................................