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12 July 2023 A passively heat-sunk 6-W 1064-nm linearly-polarized fiber amplifier with a 100 °C operational temperature range for LEO satellite optical communications
François Gonthier, Viorel Poenariu, Sean McCarthy, Qi-Yang Peng, Daoping Wei, Vincent Latendresse
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Proceedings Volume 12777, International Conference on Space Optics — ICSO 2022; 1277745 (2023) https://doi.org/10.1117/12.2690667
Event: International Conference on Space Optics — ICSO 2022, 2022, Dubrovnik, Croatia
Abstract
A 6 W fiber optic amplifier at 1064 nm has been designed for LEO satellites. The amplifier is passively cooled and operational for a heat sink plate temperature from -35˚C to +65˚C. It is polarization-maintaining and is designed for a 2.7 Gbps phase-modulated single-frequency (10 kHz) signal at 1064 nm with an input power between 1 and 20 mW. The unit has a set of redundant pump laser diodes and redundant photodiodes (PD) as well as redundant inputs ports but does not contain any electronics and power supply which are provided externally. A qualification module was tested from -35˚C to +65˚C and when though, vibration and shock, and electro-magnetic testing. The unit showed good performance except for the extreme temperatures where the maximum power output of 6 W was not achieved because of the specified current limit. An increase in the current of 4% at +65˚C and 17% at -35˚C was required to reach 6W. The operational 5W specification was achieved at all temperatures. Furthermore, the module was submitted to a 25 krad accelerated non-operational radiation test to measure the effect of photodarkening. A post radiation photobleaching was performed to better estimate the degradation in space during operations. The experimentally estimated loss from the predicted 8 krad exposition during the lifetime of the units is 3%. Four flight modules were built and tested in the operational temperature range of between -30 ˚C and +60˚C as well as in vibration.
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François Gonthier, Viorel Poenariu, Sean McCarthy, Qi-Yang Peng, Daoping Wei, and Vincent Latendresse "A passively heat-sunk 6-W 1064-nm linearly-polarized fiber amplifier with a 100 °C operational temperature range for LEO satellite optical communications", Proc. SPIE 12777, International Conference on Space Optics — ICSO 2022, 1277745 (12 July 2023); https://doi.org/10.1117/12.2690667
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KEYWORDS
Temperature metrology
Astronomical imaging
Vibration
Photobleaching
Power consumption
Satellites
Fiber amplifiers
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