Theoretical analysis of communication systems based on low-coherence interferometry.

Area of Science:

• Optical Communications
• Interferometry
• Signal Processing

Background:

• Optical communication systems face challenges from crosstalk, dispersion, and noise, limiting channel capacity.
• Low-coherence interferometry (LCI) offers potential for advanced data modulation through optical path differences.
• Existing systems struggle with signal integrity due to amplified spontaneous emission (ASE) and other noise sources.

Purpose of the Study:

• To analyze signal integrity factors like crosstalk, dispersion, and SNR in an LCI-based optical communication system.
• To investigate the potential of LCI for spectral and spatial multiplexing, increasing transmission channels.
• To develop a theoretical framework for understanding noise and dispersion effects in LCI systems.

Main Methods:

• Detailed analysis of crosstalk, dispersion, and signal-to-noise ratio (SNR) in the LCI system.
• Modeling dispersion effects using Taylor expansion of refractive index.
• Development of a unified noise model encompassing ASE from EDFAs and Raman amplification.
• Theoretical analysis of optical field phase influence on interference.

Main Results:

• The LCI system shows strong resilience to impairments like chromatic dispersion and crosstalk.
• Partial coherence of the superluminescent source and interferometric architecture enhance signal integrity.
• The proposed system enables spectral and spatial multiplexing for increased channel capacity.
• Balanced detection interferometers effectively suppress common-mode noise, ensuring robust signal recovery.

Conclusions:

• The LCI-based optical communication system offers a robust solution for high-capacity data transmission.
• The system's architecture effectively mitigates common noise sources and dispersion effects.
• This approach provides a new degree of freedom for data modulation, enhancing system performance.