US 11,320,594 B2 · Optical system comprising chlorine doped mode field expanded optical fibers

Abstract

An optical system comprising: an optical assembly having a first optical surface and a rear optical surface, said optical assembly comprising at least three optical elements; an optical fiber comprising a core portion with a mode field diameter (MFD) expanded region optically coupled to the rear optical surface of the optical assembly, the optical fiber comprising a core region doped with chlorine in a concentration greater than 0.5 wt %, wherein the MFD expanded region is less than 5 cm in length, and has MFD at the fiber end coupled to the optical assembly that is a least 20% greater than the MFD at other end of the optical fiber; an optical signal source coupled to first optical surface of the optical assembly, such that the optical signal provided by the optical signal source is routed along an optical path formed by the optical assembly to the mode field diameter expanded region of said optical fiber.

Claims22

Dependent claims

An optical system comprising:

(i) an optical assembly comprising a first optical surface and a rear optical surface, said optical comprising at least three optical elements,
(ii) an optical fiber comprising a core portion with a field expanded region optically coupled to the rear optical surface of the optical assembly, the optical fiber comprising a core region doped with chlorine in a concentration greater than 0.5 wt %, and wherein the mode field expanded region is less than 5 cm in length, and
the optical fiber having, at an operating wavelength λ, a mode field diameter at the fiber end coupled to the optical assembly that is a least 20% greater than the optical fiber mode field diameter at other end of the optical fiber;
and
(iii) an optical signal source coupled to first optical surface of the optical assembly, such that the optical signal provided by the optical signal source is routed along an optical path formed by the optical assembly to the field expanded region of said optical fiber.

2 more elements

An optical system comprising:

(A) the optical fiber comprising:
a length L, a first end face and a second end face, and a MFD at the first end face of the fiber that is different from MFD at another region of the fiber, the fiber further comprising:
(I) a first Cl doped silica based core comprising:
(a) a first Cl doped core region having a maximum refractive index Δ0 such that 0.05%≤Δ0≤0.6% (relative to undoped silica), and an outer core diameter D0, wherein 5 microns≤D0≤12 microns, said first Cl doped core region having maximum Cl concentration [Cl], where 0.5 wt. %≤[Cl]≤5 wt. %;
and
(b) a Cl doped tapered core region situated adjacent to the first Cl doped core region and to the first fiber end face, the Cl doped tapered core region having a length L2 where 0.05 mm≤L2≤50 mm, and a maximum core refractive index Δc that decreases along the length of the tapered core region, the tapered region having an outer diameter that changes along the length L2 and a maximum diameter Dmax, such that
Dmax≥D0+3 microns;
(i)
8 microns≤Dmax≤70 microns;
and (ii)
(II) a silica based cladding surrounding the Cl doped silica based core;
(B) an optical assembly comprising a plurality of optical elements coupled to the Cl doped tapered core region of the optical fiber;
(C) another optical fiber coupled to said a first Cl doped core region.

10 more elements

Dependencies are inferred from the claim text.

Optical system comprising chlorine doped mode field expanded optical fibers

Life of this patent

Optical system comprising chlorine doped mode field expanded optical fibers

Life of this patent

Abstract

Claims22