Techniques for manipulating crosstalk in multicore fibers

摘要

A multicore optical fiber includes a plurality of core regions disposed within a common cladding region. Each of the plurality of core regions is configured, in combination with the common cladding region, to propagate light along a longitudinal axis of the fiber. At least two core regions are configured to inhibit resonant coupling of propagated light therebetween within a selected region of operation. At least one segment of the fiber includes a twist that is configured such that when the twisted segment is subjected to a bend having a selected radius, the twist creates a controlled change in the amount of crosstalk between the at least two core regions, compared with the amount of crosstalk between the at least two core regions when a bend having the selected radius is introduced into a non-twisted segment of the fiber.

主权项

1. A multicore optical fiber, comprising:
a plurality of core regions disposed within a common cladding region, wherein each of the plurality of core regions is configured, in combination with the common cladding region, to propagate light along a longitudinal axis of the fiber, wherein at least two core regions are configured to inhibit resonant coupling of propagated light therebetween within a selected longitudinal region of operation, wherein at least one segment of the longitudinal region includes a twist that is configured such that when the twisted segment is subjected to a bend having a selected radius, the twist creates a controlled change in the amount of crosstalk between the at least two core regions, compared with the amount of crosstalk between the at least two core regions w hen a bend having the selected radius is introduced into a non-twisted segment of the fiber, wherein the twist has a configuration based on the relationship⟨Un.m2⟩≈2⁢π⁢⁢Cnmλ2⁢(z2-z1)⁢Sff⁡(Δβm.n) where
U represents a matrix of unperturbed mismatch values,C represents resonant coupling,λ is wavelength,z2-z1 represents a fiber interval, andSff represents power spectral density of an autocorrelation function Rff of a random process f.