Multi-image transmission based on a multi-channel OAM-array-coded optical communication system using a designed...

Area of Science:

• Optical communications
• Beam physics
• Information theory

Background:

• Vortex beams (VBs) offer potential for high-capacity optical communications.
• Limited capacity of typical VBs due to single orbital angular momentum (OAM) hinders practical applications.

Purpose of the Study:

• To propose and demonstrate a method for simultaneous generation of high-quality VB arrays with multiple OAMs.
• To develop a multi-channel optical communication system utilizing these VB arrays.
• To enhance the capacity and versatility of VB-based communication.

Main Methods:

• Controllable simultaneous generation of VB arrays with multiple OAMs.
• Implementation of a VB array-based multi-channel optical communication system.
• Integration of a custom-designed Dammam grating and an integrated vortex grating.
• Utilizing a single-input multiple-output deep learning recognition model for signal processing.

Main Results:

• Successful experimental demonstration of simultaneous transmission of four grayscale images.
• Achieved an average error rate of less than 0.003 without turbulence.
• Demonstrated an average error rate of 0.061 in the presence of turbulence.

Conclusions:

• The proposed multi-channel method significantly increases the versatility of VB arrays.
• This approach broadens the application of VB arrays in high-capacity optical communications.
• The system shows robustness in the presence of optical turbulence.