HFAN-09.2.0: Thermistor Compensation for Temperature-Induced Slope Efficiency Variations in PON Burst-Mode Laser Drivers
Abstract: The optical network terminal (ONT) in any passive optical network (PON) system requires a burst-mode laser diode driver. This laser driver must be capable of quickly turning on a laser diode, modulating the laser to send a burst of data, and then quickly shutting down to allow another user to transmit. Since the ONT may be mounted on the outside of a building, it must be capable of robust operation over the full -40 to +85 °C temperature range. There are several integrated circuit burst-mode laser drivers commercially available today. In most cases these burst-mode laser drivers include very effective closed-loop temperature compensation for variations in laser diode threshold current caused by temperature and aging. Unfortunately they generally do not include internal methods for changing their output modulation current to compensate for temperature induced variations in laser diode slope efficiency.
The application note you have requested is available in Acrobat PDF format:
Automatic Updates
Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™.
Download, PDF Format