Negative Chromatic Dispersion Generated by Introducing Curvature into Photonic Crystal Fiber

M Lucki

doi:10.14311/964

Abstract

This is a modeling work, which aims to show that negative chromatic dispersion (CD) may be obtained in a PCF by fiber bending. Results from the study of negative dispersion could be employed in a new dispersion compensating technique. The proposed method does not require doping in the core, and does not require external cores. The minimum negative dispersion achieved by this method was -185000 ps/nm/km. Problems of bending losses and sensitivity of the dispersion with respect to deviations of geometry were studied.

Highlights

Existing dispersion compensating techniques and methods for negative chromatic dispersion (CD)Negative CD could be used in telecommunications for opposite slope dispersion compensation, and can be achieved by various methods, such as those based on chirped gratings [1], dispersion compensating filters [2], Brewster-angled chirped mirrors [3], and soliton-induced negative dispersion [4]
This is a modeling work, which aims to show that negative chromatic dispersion (CD) may be obtained in a PCF by fiber bending
Negative CD could be used in telecommunications for opposite slope dispersion compensation, and can be achieved by various methods, such as those based on chirped gratings [1], dispersion compensating filters [2], Brewster-angled chirped mirrors [3], and soliton-induced negative dispersion [4]

Summary

Existing dispersion compensating techniques and methods for negative CD

Negative CD could be used in telecommunications for opposite slope dispersion compensation, and can be achieved by various methods, such as those based on chirped gratings [1], dispersion compensating filters [2], Brewster-angled chirped mirrors [3], and soliton-induced negative dispersion [4]. Most models proposed as PCF-based DCFs suggest the presence of dual concentric cores – by introducing one ring with smaller holes or removing an entire chosen ring of holes [8] [9], or creating proper index diversity by doping to ensure significant index contrast [10]. An MOF undoped in the core with seven dual cores designed for CD compensation was proposed by Zhang et al [8]; the negative dispersion coefficient was 4500 ps/nm km. This may result in thousands of ps/nm/km of negative dispersion, negative the CD was sensitive to hole diameter deviation. Negative CD in the case of fiber bending has been obtained only in a step-index fiber [12] (2007), where LP02 is not scattered

Possibilities of modeling a bent PCF with coupling modes

Findings

Discussion

Conclusions