03-12-2020 дата публикации
Номер: US20200379167A1
A high backscattering optical fiber comprising a perturbed segment in which the perturbed segment reflects a relative power such that the optical fiber has an effective index of n, a numerical aperture of NA, a scatter of R, a total transmission loss of α, an in-band range greater than one nanometer (1 nm), a center wavelength (λ) of the in-band range (wherein 950 nm<λ<1700 nm), and a figure of merit (FOM) in the in-band range. The FOM>1, with the FOM being defined as: 2. The optical fiber of claim 1 , wherein the scatter varies axially along the optical fiber.3. The optical fiber of claim 2 , further comprising a distal end and a proximal end claim 2 , the scatter being stronger at a portion of the distal end than at a portion of the proximal end.4. The optical fiber of claim 1 , wherein 1500 nm<λ<1625 nm.5. The optical fiber of claim 1 , wherein the scatter comprises a backscatter that is greater than Rayleigh scattering.6. The optical fiber of claim 1 , wherein the scatter comprises a backscatter that is more than three decibels (3 dB) above Rayleigh scattering.7. The optical fiber of claim 1 , wherein the optical fiber exhibits a total backscattering level below −20 dB.8. The optical fiber of claim 1 , further comprising a mode effective area that is no smaller than that of a standard single-mode fiber.9. The optical fiber of claim 1 , further comprising a coupling loss of less than 0.5 decibels (dB) when coupled to a transmission fiber.10. The optical fiber of claim 1 , wherein the optical fiber is a multicore optical fiber.12. The optical fiber of claim 11 , further comprising a distal end and a proximal end claim 11 , the scatter being stronger at a portion of the distal end than at a portion of the proximal end.13. The optical fiber of claim 11 , further comprising a center wavelength (λ) of the in-band range claim 11 , wherein 950 nm<λ<1700 nm.14. The optical fiber of claim 13 , wherein 1500 nm<λ<1625 nm.15. The optical fiber of claim 11 , wherein the ...
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