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AD5255 Datasheet(PDF) 19 Page - Analog Devices |
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AD5255 Datasheet(HTML) 19 Page - Analog Devices |
19 / 20 page AD5255 Rev. 0 | Page 19 of 20 APPLICATIONS LASER DIODE DRIVER (LDD) CALIBRATION The AD5255 can be used with any laser diode driver. Its high resolution, compact footprint, and superior temperature drift characteristics make it ideal for optical parameter setting. The ADN2841 is a 2.7 Gbps laser diode driver that uses a unique control algorithm to manage both the laser average power and extinction ratio after initial factory calibration. It stabilizes the laser data transmission by continuously monitoring its optical power and by correcting the variations caused by temperature and the laser degradation over time. In the ADN2841, the IMPD monitors the laser diode current. Through its dual-loop power and extinction ratio control, calibrated by the AD5255, the internal driver controls the bias current IBIAS and consequently the average power. It also regulates the modulation current, IMODP, by changing the modulation current linearly with slope efficiency. Any changes in the laser threshold current or slope efficiency are, therefore, compensated. As a result, this optical supervisory system minimizes the laser characterization efforts, enabling designers to apply comparable lasers from multiple sources. AD5255 ADN2841 SDA SCL PSET ERSET ASET VCC VCC Figure 33. Optical Supervisory System |
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