Characteristic parameters of monomode fibers.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Monomode optical fibers are crucial for modern communication.
• Accurate characterization of optical fiber near- and far-field patterns is essential for performance optimization.
• Existing methods for parameter determination can be sensitive to unknown refractive index profiles.

Purpose of the Study:

• To develop a universal representation for near- and far-field characteristics of monomode optical fibers.
• To evaluate the accuracy of different methods for determining key fiber parameters (spot size, cutoff wavelength) when the refractive index profile is unknown.

Main Methods:

• Rigorous analysis of the Gaussian approximation applied to monomode optical fibers.
• Development of a universal representation applicable to all practical refractive index profiles.
• Comparative analysis of parameter determination methods under profile uncertainty.

Main Results:

• A universal representation of near- and far-field characteristics has been established.
• The accuracies of various methods for determining spot size (w(0)) and cutoff wavelength (λ(c)) were compared.
• The study provides insights into the robustness of different characterization techniques.

Conclusions:

• The Gaussian approximation offers a versatile framework for optical fiber analysis.
• The findings aid in selecting appropriate methods for fiber characterization, even with incomplete profile information.
• This work contributes to the reliable design and deployment of optical fiber systems.