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Stokes-space analysis of modal dispersion in fibers with multiple mode transmission |
Optics Express, Vol. 20, Issue 11, pp. 11718-11733 (2012)
http://dx.doi.org/10.1364/OE.20.011718
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Abstract
Modal dispersion (MD) in a multimode fiber may be considered as a generalized form of polarization mode dispersion (PMD) in single mode fibers. Using this analogy, we extend the formalism developed for PMD to characterize MD in fibers with multiple spatial modes. We introduce a MD vector defined in a D-dimensional extended Stokes space whose square length is the sum of the square group delays of the generalized principal states. For strong mode coupling, the MD vector undertakes a D-dimensional isotropic random walk, so that the distribution of its length is a chi distribution with D degrees of freedom. We also characterize the largest differential group delay, that is the difference between the delays of the fastest and the slowest principal states, and show that it too is very well approximated by a chi distribution, although in general with a smaller number of degrees of freedom. Finally, we study the spectral properties of MD in terms of the frequency autocorrelation functions of the MD vector, of the square modulus of the MD vector, and of the largest differential group delay. The analytical results are supported by extensive numerical simulations.
© 2012 OSA
OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4230) Fiber optics and optical communications : Multiplexing
(060.4510) Fiber optics and optical communications : Optical communications
ToC Category:
Fiber Optics and Optical Communications
History
Original Manuscript: February 2, 2012
Revised Manuscript: March 28, 2012
Manuscript Accepted: March 29, 2012
Published: May 9, 2012
Citation
Cristian Antonelli, "Stokes-space analysis of modal dispersion in fibers with multiple mode transmission," Opt. Express 20, 11718-11733 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-11-11718
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