Based on a truncated ellipse Gaussian model for localized distortion in transmission-type optical antenna, the receiver power penalty due to localized wavefront deformation is researched. It is shown that the receiver power depends on distortion deepness h, radii a and b, and position d, and changes regularly with them. Localized distortion has the greatest influence on receiver power at a depth of h1.45, which does not depend on other deformation parameters. The maxima of the receiver power penalty for different distortion radii are given. To reduce the impact of localized distortion on the receiver power, the machining precision of lenses should be better than 1.45. We hope the results can be used in the design of intersatellite laser communication systems.
The erbium doped fiber, optical isolator and WDM coupler, which are three key optical components of commercial
erbium-doped fiber amplifier (EDFA), are radiated to the radiation dose of 5krad by electron. The radiated erbium-doped
fiber (EDF) make the output power of EDFA come down 0.5dB when the input power is between -12dBm and-5dBm.
The NF climb up 1dB. However, the peak wavelength changes little. The radiation experiment results also show that the
deterioration of the optical isolator and WDM coupler can be neglected at the dose of 5krad. In order to assure the
accuracy of analysis, the recovery experiment has been done to correct the radiation effect on the EDFA. The results
indicate that if optical communication systems have enough redundancy, the EDFA can be used on the low dose orbits
without any radiation protection for inter-satellite optical communication.