【正文】 成了整個光收發(fā)器的設(shè)計工作。然后對光收發(fā)器在低溫，常溫，高溫三種環(huán)境下的所有參數(shù)進行測試。結(jié)果如表1 所示。表1 光收發(fā)器的參數(shù)測試結(jié)果參數(shù)單位設(shè)計要求測試結(jié)果40186。C25186。C80186。C平均發(fā)射功率dBm9～3消光比dB9發(fā)射眼圈接收靈敏度dBm23從表中可以看出。激光器的輸出光功率和消光比都在參數(shù)要求范圍內(nèi)，且變化小。測試了各個溫度下的眼圖，發(fā)現(xiàn)光收發(fā)器在低溫，常溫，低溫下的性能都比較好。由于溫度變高時需要提供較大的調(diào)制電流，因此信號的下沖比較明顯，表現(xiàn)在眼圖中就是在眼圖中的“0”信號出現(xiàn)輕微雙眼線。但總體上模板測試余量都大于40%。由此驗證了此設(shè)計方案的可行性和正確性。5 總結(jié)經(jīng)過方案討論、硬件設(shè)計、軟件設(shè)計和樣品調(diào)試、測試。 單芯片SFP 光收發(fā)器。此方案的特點是把激光驅(qū)動和接收放大部分集成在一起，使用了普通單片機進行控制,理論上能夠降低了產(chǎn)品的成本和提高生產(chǎn)效率。由于此方案是一個新的方案，技術(shù)成熟度有待提高，系統(tǒng)兼容性和市場應(yīng)用的潛在問題有待驗證。加上用量的關(guān)系，其成本的優(yōu)勢也體現(xiàn)不出很大的優(yōu)勢。但是可以相信，隨著網(wǎng)絡(luò)速率的加快和光接入對成本的壓力，新技術(shù)會越來越完善，市場占有率也會越來越高，屆時成本優(yōu)勢就會體現(xiàn)出來。MicrocontrollerBased Optical Transceiver Design1 IntroductionUnder the impetus of the “Three Net Combined”, Fiber access programme such as FTTH (fiber to the home) is widely used. Under the voice of the light for copper, the optical network is developing rapidly. Optical transceiver plays a role of electro optical, electro optical conversion in optical munications, and is an essential device for optical munication. As it relates to highspeed circuit design, precision machining and optical design, the cost of optical transceivers occupies an important part in fiber optical munication systems and while the high prices of optical transceivers bee the bottleneck of restricting fiber access promotion. Further reduce the cost of optical transceivers will benefit to promote the application of optical access and speed up the pace of light for copper. Optical transceiver mainly consists of circuits, optical transmitter ponents and optical receiver ponents. And the Part of the circuit which also includes laser driver, optical receiver signal amplifier and control section. In current ,The circuit part of optical transceivers on the market is using three specific chip. The pany has always been in the study of laser driver and receiving signal amplifier circuit integration in a device, with the controller using the mon embedded processor solutions. Due to only use a specific chip and a mon chip, we can significantly low the cost of the circuit part. The PHY1076 chip developed by PHYWORKS pany is such a chip. It is intended mainly for to optical transceiver with a simple external circuit, and it requires only an ordinary 8bit microcontroller to realize the control circuit. This paper studies the performance of the PHY1076 which controled by the selected ATMEL pany39。s ATMEGA88 microcontroller, designed the optical transceiver samples, and conducted the performance test, with the ultimate success of the design of the optical transceiver.2 Discussion About The Design And Working Principle Of Optical TransceiverIn the development process of optical transceiver, there are many different outline package. SFP (Miniaturization hotswappable optical transceiver module) is currently one of the most advanced package in 5Gbps rate, with a small, hotswappable, low power consumption, high system integration and the ability to digitally Diagnostics and so on.This design uses laser driver circuit and optical receiver amplifier circuit ntegrated PHY1076 as a special chip , using ATMEL39。s AVR ATMEGA88 microcontroller to control and implement DDM functionality, coupled with the corresponding TOSA (transmitter optical ponents), ROSA (receiver optical ponents) and structural parts to designe a SFP optical transceiver which can work in 10km transmission distance. System block diagram shown in Figure 1:Figure 1 the internal structure of fiber optic transceivers map1) Transmitter works: Serial data signal from the TX + / side of the system input to the PHY1706 laser drive section in the form of differential signal terminal. After amplificationd, drive circuit converted to differential modulation current signal loading to the TOSA (transmitter optical ponents) to control the laser TOSA to emit light pulses, and couple into the fiber to sent to the remote.2) Receive part work principle : Optical pulse signal inputs to the ROSA (receiver optical