Achievable information rate optimization in C-band optical fiber communication system

Area of Science:

• Optical Communications
• Information Theory

Background:

• Nonlinear effects and transceiver noise limit performance in optical fiber communication networks.
• Achievable Information Rate (AIR) is quantified using the product of mutual information (MI) and communication bandwidth.
• Generalized Mutual Information (GMI) accounts for MI loss due to transceivers, particularly impacting higher-order modulation formats.

Discussion:

• The study evaluates AIR for QPSK, 16QAM, 64QAM, and 256QAM modulation formats.
• Analysis considers varying communication bandwidths and transmission distances.
• The enhanced Gaussian noise (EGN) model is employed for performance assessment.

Key Insights:

• Higher-order modulation formats experience more significant MI loss from transceivers.
• The optimal modulation format selection is dependent on specific transmission scenarios, including bandwidth and distance.
• The GMI metric provides a more accurate AIR calculation by including transceiver-induced losses.

Outlook:

• This research aids in selecting appropriate modulation formats for diverse optical communication systems.
• Further investigation into mitigating transceiver noise effects could enhance future system performance.
• The findings contribute to optimizing data transmission rates in high-speed optical networks.