Approach to improve beam quality of inter-satellite optical communication system based on diffractive optical...

Area of Science:

• Optical Engineering
• Telecommunications
• Diffractive Optics

Background:

• Inter-satellite optical communication systems using reflective telescopes suffer energy loss due to central obscuration by the secondary mirror.
• This blockage reduces the efficiency and performance of transmitted signals.

Purpose of the Study:

• To introduce and evaluate a novel scheme using diffractive optical elements (DOEs) to mitigate energy loss in reflective telescope transmitters.
• To improve the beam quality and transmission efficiency of inter-satellite optical communication systems.

Main Methods:

• A novel scheme employing a diffractive beam shaper and a diffractive phase corrector was designed.
• Numerical simulations were conducted to analyze the performance with a fixed obscuration ratio of 1/4.
• The intensity patterns were further analyzed across various obscuration ratios.

Main Results:

• The proposed DOE scheme achieved an emission efficiency of 99.99%.
• Beam divergence remained unchanged, maintaining signal collimation.
• Peak intensity at the receiver plane increased by approximately 31% compared to typical configurations.

Conclusions:

• The novel DOE-based approach effectively overcomes central obscuration losses in reflective telescope transmitters for optical communication.
• The scheme significantly enhances transmission efficiency and receiver plane intensity without compromising beam quality or other functionalities.
• The system demonstrates robustness across varying obscuration ratios, offering a viable solution for improved inter-satellite communication.