Dispersion-compensating fiber based on LP01 mode for WDM systems: propagation solution by the finite element method

Aditya Goel; J. L. Rana

doi:10.1117/12.424703

12 April 2001 Dispersion-compensating fiber based on LP₀₁ mode for WDM systems: propagation solution by the finite element method

Aditya Goel, J. L. Rana

Author Affiliations +

Proceedings Volume 4271, Optical Pulse and Beam Propagation III; (2001) https://doi.org/10.1117/12.424703
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

In order to realize high data rates over long distances with already installed standard single mode fiber, techniques must be found to overcome the pulse spreading due to the positive chromatic dispersion of the transmission fiber. A dispersion compensation technique for compensating group velocity dispersion in single mode fiber over a wide span (100 nm) of wavelength is presented here by using the large negative waveguide dispersion that occurs for the LP01 mode, thereby ending up with negligible net pulse spreading. Dispersion compensation using higher order modes has been proposed earlier ,but with the limitation of periodic conversion of signal to higher order modes. Here the signal always remain in LP01 mode. Quadratic Finite Element Method (FEM) is used to analyze the propagation characteristics of light within an optical waveguide having chirp type refractive index profile. The maximum compensated dispersion Dcompmax over the wavelength range of 1 500 nm to 1600 nm is then minimized as a function of profile parameters and length ratio. This technique has the potential to eliminate chromatic dispersion over a wide bandwidth which encompasses the gain bandwidth(1530 - 1570 nm) of an erbium - doped fiber amplifier. Computer simulations show that an optimally designed dispersion compensating fiber can reduce the dispersion from 18.62 ps/ km -nm to 1 .40 ps/ km - nm when it is concatenated with the existing step index single mode fiber in a ratio of 15.3 8 : 1.

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Aditya Goel and J. L. Rana "Dispersion-compensating fiber based on LP₀₁ mode for WDM systems: propagation solution by the finite element method", Proc. SPIE 4271, Optical Pulse and Beam Propagation III, (12 April 2001); https://doi.org/10.1117/12.424703

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