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Optical Engineering

Nonlinear pulse reshaping in a designed erbium-doped fiber amplifier with a multicladded index profile
Author(s): Navonil Bose; Dipankar Ghosh; Sampad Mukherjee; Mousumi Basu
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Paper Abstract

A multicladded normally dispersive erbium-doped fiber amplifier (ND-EDFA) is designed for a short length to operate at the wavelength of 1550 nm with a dispersion of −6.5  ps/km nm and parabolic pulse generation through the proposed fiber is studied. The proposed ND-EDFA shows a flattened gain spectrum in C -band. The nonlinear Schrödinger equation is solved numerically in presence of fiber gain, nonlinearity, and dispersion to investigate the pulse propagation through the proposed fiber. While continuous wave (CW) sources are considered, parabolic self-similar pulses with structure factor of 0.072 are created at suitable values of optimum fiber length when input pulse properties and fiber parameters are optimized accordingly. Side by side with a low repetition rate laser source, the pulse propagation equation is controlled by the gain dispersion term and dipole relaxation time, such that the evolution of Gaussian pulses may lead to nonparabolic regime. The effects of pulse parameters like power level, pulse width, and dipole relaxation time on the propagation of input Gaussian pulses through the so-designed ND-EDFA are investigated. Our results depict that the pulses with same input energy reshape into exactly parabolic shape for CW laser source or nonparabolic profile for a laser source with low repetition rate.

Paper Details

Date Published: 2 August 2013
PDF: 10 pages
Opt. Eng. 52(8) 086104 doi: 10.1117/1.OE.52.8.086104
Published in: Optical Engineering Volume 52, Issue 8
Show Author Affiliations
Navonil Bose, Bengal Engineering and Science Univ. Shibpur (India)
Dipankar Ghosh, MCKV Institute of Engineering (India)
Sampad Mukherjee, Bengal Engineering and Science Univ. Shibpur (India)
Mousumi Basu, Bengal Engineering and Science Univ. Shibpur (India)

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