Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 27, Issue 23, Pages 5461-5468Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2009.2030146
Keywords
Depolarization; field-coupling model; higher-order modal dispersion; higher-order principal modes (PMs); impulse response; multimode fiber (MMF); polarization-mode dispersion (PMD); power nonlinearity; principal state of polarization (PSP); pulse broadening
Funding
- National Science Foundation [ECCS-0700899]
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Previously, we proposed a field-coupling model for propagation in graded-index multimode fiber (MMF), analogous to the principal states model for polarization-mode dispersion (PMD) in single-mode fiber. That model was based on the concept of first-order principal modes, which have well-defined group delays that depend on the strength of the mode coupling. That first-order model predicts a linear relationship between the intensity waveforms at the MMF input and output. Here, we extend that model to account for higher order modal dispersion. The higher-order model predicts several effects analogous to higher-order PMD: pulse broadening, filling-in between peaks of the pulse response, depolarization and pattern blurring at the MMF output, and a nonlinear relationship between input and output intensity waveforms.
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