Development of a continuous wave single transverse mode polarization-maintaining 10 W Er/Yb-codoped fiber amplifier for space communications

Hiroki Kobayashi; Ryoko Kano; Takashi Seo; Yasushi Suzuki; Eiichi Mizuta; Yosuke Hashimoto; Tomohiro Araki; Yasutoshi Takada

doi:10.1117/12.2644913

15 March 2023 Development of a continuous wave single transverse mode polarization-maintaining 10 W Er/Yb-codoped fiber amplifier for space communications

Hiroki Kobayashi, Ryoko Kano, Takashi Seo, Yasushi Suzuki, Eiichi Mizuta, Yosuke Hashimoto, Tomohiro Araki, Yasutoshi Takada

Author Affiliations +

Proceedings Volume 12413, Free-Space Laser Communications XXXV; 124130G (2023) https://doi.org/10.1117/12.2644913
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Space optical communications have attracted growing attention as space data traffic volumes continue to increase, and as part of ongoing efforts to develop high-speed optical space networks, Nikon and JAXA have been developing a singletransverse- mode 10 W polarization-maintaining Er/Yb-codoped fiber (EYDF) amplifier for modulated continuous-wave signals. We have finished developing the engineering model (EM) and plan to demonstrate this amplifier as a part of optical communication system on the International Space Station in 2024. The EM amplifier has a three-stage backward pumping structure with radiation-hardened EYDF. It also includes pump laser diodes, and power monitoring photodiodes to avoid parasitic lasing, both of which have been confirmed to have adequate radiation tolerance, as well as a control driver circuits. The overall dimensions are 300 mm × 380 mm × 76 mm, and it weighs 6.3 kg. The EM amplifier achieved optical output power of 10 W at pumping power of 34 W in total under standard temperature and pressure conditions (STP: room temperature, 1 atm) with a −3 dBm signal input. The total wall-plug efficiency reached 10.1%. The amplifier achieved an operating time of 2000 hours at 10 W under STP. We conducted a mechanical vibration test and an operating thermal vacuum test to ensure the reliability of the amplifier as a space component. At the upper and lower end of the operation temperature range, ±0 and +50 °C, the output power and polarization extinction ratio (PER) were >10 W and >16 dB, respectively, without any degradation of the amplification gain or PER.

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Hiroki Kobayashi, Ryoko Kano, Takashi Seo, Yasushi Suzuki, Eiichi Mizuta, Yosuke Hashimoto, Tomohiro Araki, and Yasutoshi Takada "Development of a continuous wave single transverse mode polarization-maintaining 10 W Er/Yb-codoped fiber amplifier for space communications", Proc. SPIE 12413, Free-Space Laser Communications XXXV, 124130G (15 March 2023); https://doi.org/10.1117/12.2644913

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