Pump laser diodes emitting at 980 nm are typically used in distribution network transmission systems in order to amplify C+L band signals for long distance optical telecommunication systems and are now implemented in space missions especially for Fiber Optic Gyroscopes (FOGs) and foreseen for intra-satellite communication links and calibration systems. However as the pump source is potentially a critical point for such systems, there is a huge need to assess their reliability in space environment, especially in terms of operation under vacuum conditions. Some published studies have been already reported on qualification results of high power 808nm pump laser diodes arrays in vacuum environment especially for NASA future space missions. Because no catastrophic failures were observed, the authors concluded that the laser diodes are robust enough to survive in the harsh space environment. Nevertheless, regarding both complexity of space environment and variety of Laser diode technologies, a good understanding of the physics of failure and an appropriate testing method are crucial to scope high levels of reliability. However up to now, long term in-vacuum reliability testing of 980nm laser diodes was never clearly addressed. Because the chip is embedded into a sealed package, this last is not directly exposed to vacuum environment but depending on the package leak rate, the internal pressure may vary from its initial value to the external pressure one.
Long term in-vacuum reliability testing of 980nm laser diode pump modules for space applications
01.03.2014
2871100 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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