Abstract
Rayleigh backscattering (RB) and Fresnel reflection (FR) effects can
cause severe degradation on the performance of a WDM-PON system utilizing
loop-back schemes that provide colorless upstream transmitters. We proposed
cross-seeding schemes to overcome these problems and also to improve the utilization
efficiency of the seeding lights. The operation principles of two types of
cross-seeding schemes: mutual seeding and shared seeding are discussed in
detail for different applications. A generalized formulation of the crosstalk
from the RB and FR effects is derived for comparing the performance between
a conventional WDM-PON and a cross-seeding WDM-PON. It is found that the cross
seeding schemes can be most beneficial for the system with low loop-back gain
or low reflection at the distribution fiber or drop fiber. This is especially
advantageous for the shared seeding scheme in which the seeding light can
be transmitted along a separate fiber with high power or by optical amplification
such that the gain of the loop-back transmitter can be kept small. Application
examples are used to demonstrate the merits and feasibility of the cross-seeding
schemes.
© 2011 IEEE
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