Encoding information in the mutual coherence of spatially separated light beams

Area of Science:

• Optics and Optical Communications
• Information Theory
• Cryptography

Background:

• Coherence is a fundamental property of light, extensively utilized in optical communications for data multiplexing.
• Historically, coherence has not been employed for direct data encoding.
• Existing optical communication methods primarily use coherence for signal separation, not information embedding.

Purpose of the Study:

• To introduce a novel coding scheme named mutual coherence coding.
• To encode information using the mutual coherence of spatially separated light beams.
• To analyze the performance and scalability of this new coding method.

Main Methods:

• Implementation of the mutual coherence coding scheme.
• Derivation of key performance metrics: signal-to-noise ratio, maximum bit-rate, and spectral efficiency.
• Analysis of performance relative to the number of transmitted light beams.

Main Results:

• Mutual coherence coding enables encoding information in the mutual coherence between light beams.
• The scheme demonstrates a quadratic scaling of transmitted signals with the number of light beams.
• Performance metrics such as SNR, bit-rate, and spectral efficiency were quantitatively analyzed.

Conclusions:

• Mutual coherence coding presents a new paradigm for data encoding in optical systems.
• The quadratic scaling offers significant advantages for increasing data transmission capacity.
• This technique holds promise for applications in cryptography and enhanced data security.