電子專業(yè)中英文翻譯(參考版)
2025-06-19 13:42本頁(yè)面
【正文】 CAverage transmitteddBm9～3Extinction ratiodB9Emission eye socketReceiver SensitivitydBm23As it can be seen from the table. The laser’s output optical power and extinction ratio are within the required parameter range with small changes. When tested eye pattern under each temperature,we found the performance at low temperatures, room temperature, low temperature are all good. As the temperature goes high ,it need to provide greater modulation current. So the signal’s undershoot is obvious as a slight eye line appearing in the 0 signals in the eye pattern. But the overall margin on the template test are greater than 40%. Thus validated the feasibility and correctness of the design.5 SummaryAfter discussing the program, software design ,hardware design and sample’s debuging and testing. Ultimately,we successfully realized the design of the singlechip design SFP optical transceivers. Features of this program is to integrated the laser driven with receiving and amplifing section, to use a mon singlechip microcontroller to control programs. Both are able to reduce product costs and increase productivity theoretically. Since this program is a new program, technology maturity is to be improved, system patibility and market potential problems are yet to be tested. In addition to the amount, the cost advantage is also reflected no great advantage. But you can still believe that with the acceleration of network speed and the cost pressures when optical access, new technologies will bee more perfect and market share will the appointed time ,cost advantage will be reflected.12 / 12。C25186。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 ponents), and ROSA converts optical pulse signal into the differential voltage signal output to the PHY1076 the limiting amplifier section. After limiting amplified the signals ,it outputs differential voltage serial digital signals from the RX + / side of PHY1076.3) Control and DDM parts: PHY1076 is a mixed analogdigital chip, its internal includes multiple analogdigital (A / D) and digitalanalog converter (D / A) devices. Parameters on the transmit and receive paths are converted into digital stored in the State register for monitoring through ADC, and converts register value into analog for control by a DAC. These registers can be read and set by an external controlle. DDM (Digital Diagnostic Monitor) means that the fiberoptical transceivers is capable of monitoring parameters such as ransmitting power (Tx_power), received power (Rx_power), laser bias current (Ibias), operating voltage (Vcc) and the module internal temperature (Temperature ) in realtime and set alarm flag when the parameters exceed the settedvalue. The ADC integrated within PHY1076 can monitor the transmit power, receive power and bias current. However the operating voltage and temperature sensing is required for another ADC conversion. The realization of all these alarms relays on external controller.ATMEGA88 AVR microcontroller from ATMEL Corporation is an 8bit microcontroller, with FLASH, RAM, EEPROM, internal clock and the ADC integrated inside. Without
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