Path Integral Approach to Nondispersive Optical Fiber Communication Channel

Area of Science:

• * Information theory
• * Optical communications
• * Nonlinear optics

Background:

• * Optical fiber channels are crucial for modern communication.
• * Understanding information capacity in these channels is essential.
• * Nonlinear effects can impact signal transmission.

Purpose of the Study:

• * To summarize methods and results for theoretical information quantities in nondispersive optical fiber channels.
• * To analyze two distinct models: per-sample and time-dependent input signal.
• * To calculate mutual information and channel capacity bounds.

Main Methods:

• * Developed an approach to calculate mutual information based on the nonlinearity parameter for high signal-to-noise ratios.
• * Applied this approach to a per-sample model.
• * Investigated a time-dependent input signal model.

Main Results:

• * Derived exact calculations for mutual information in terms of the nonlinearity parameter for large signal-to-noise ratios.
• * Established a lower bound for channel capacity in the intermediate power range for the per-sample model.

Conclusions:

• * The presented methods provide a theoretical framework for analyzing information quantities in optical fiber channels.
• * Findings offer insights into channel capacity limitations and potential optimizations.
• * The study contributes to the theoretical understanding of information transmission in nonlinear optical systems.