In order to enhance the irradiation resistance of erbium-ytterbium co-doped optical fibers for long-range space communication applications, a Radiation-Resistant Erbium-Ytterbium co-doped Fiber (RREYDF) was fabricated by Modified Chemical Vapor Deposition (MCVD). The RREYDFs were irradiated at 300 Gy and 1000 Gy with an average dose rate of 0.2 Gy/s at room temperature using a Co60 irradiation source. The Radiation-Induced Absorption (RIA) at 940 nm and 1550 nm were 0.10 dB/m and 0.22 dB/m at 300 Gy and 0.47 dB/m and 0.36 dB/m at 1000 Gy, respectively. An Erbium-Ytterbium co-doped Fiber Amplifier (EYDFA) with a 1550 nm signal and a 940 nm pump source was built for gain testing. The Radiation-Induced Gain Variation (RIGV) was 0.1 dB (300 Gy) and 1.0 dB (1000 Gy) at a pump power of 7.3 W.
Er-doped fibers amplifiers (EDFAs) have widely used in many fields, such as optical fiber communication and
inertial research [1]. However, the erbium-doped fibers (EDFs), as the key component of EDFA, are extremely sensitive to
various cosmic rays (X-rays, gamma rays and protons). The fabrication of conventional EDFs add the co-dopants such as
aluminum, phosphorus and germanium for increasing the solubility of erbium ions and weakening the cluster effect [2]. As
a consequence when the erbium-doped fibers are irradiated to a certain dose, the color centers (AlE’, P1 and Ge-NBOHC,
etc.) will be generated which causes radiation-induced attenuation (RIA) and reduces EDFA amplification performance [3].
In this work, the lab-built radiation-resistant Er-doped fibers (RREDF) with the size of 9/125μm (core/cladding) were
manufactured by Modified Chemical Vapor Deposition (MCVD).The Cerium and Lanthanum were doped in fibers for
improving radiation resistance and amplification efficient [2]. Considering the radiation dose in actual space environment is
102~105Gy [3], the Er-doped fibers were irradiated by Co60 radiation source with 1500Gy dose and 0.2Gy/s dose rate at RT.
The RIA of RREDF and radiation-induced gain variation (RIGV) of RREDFA were tested, and a conventional Er-doped
fiber with the same dimension as RREDF was also fabricated for comparison. The characteristic of two EDFs are shown in
Table 1.
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