Triple-band bend tolerant optical waveguide
View Patent ↗An optical waveguide comprises a core, an inner cladding laterally surrounding the core, and an outer cladding laterally surrounding the inner cladding, wherein the core, inner cladding, and outer cladding have a depressed well configuration. The waveguide operates in three or more wavelength bands, wherein a first wavelength band is centered at about 1300 nm, and wherein a second wavelength band is centered at about 1625 nm. The waveguide has bend losses that are less than or equal to 1.0 dB/turn when measured on a 5 mm radius bend at 1625 nm and bend losses that are less than or equal to 1.5 dB/turn when measured on a 5 mm radius bend at 1650 nm.
1. An optical waveguide comprising:
a) a core having a refractive index n co and a radius r co ;
b) an inner cladding laterally surrounding the core, the inner cladding having a refractive index n ic and an outer radius of r ic ;
c) an outer cladding laterally surrounding the inner cladding, the outer cladding having a refractive index n oc ;
d) wherein the core, inner cladding, and outer cladding have a depressed well configuration, wherein n co >n oc >n ic , with
e) the range of the ratio of the inner, depressed-well clad radius, r ic , to core radius, r co , varying from about 3.0 to 5.0;
f) a +Δ of about 0.0030 to 0.0036;
g) a −Δ of about −0.0018 to −0.0012; and
h) a Δ Tot of about 0.0048 to 0.0052, wherein said fiber operates in three or more wavelength bands, wherein a first wavelength band is centered at about 1300 nm, and wherein a second wavelength band is centered at about 1625 nm, wherein the waveguide has a glass core and glass claddings, the waveguide further comprising a polymer coating adhered to the outer cladding, wherein the polymer coating comprises a material having a Shore D hardness value of at least 55, and further comprising a soft polymer material coating the polymer coating, wherein the soft polymer material comprises one or more coatings selected from the group of Desolite 3471-3-14, Desolite 3471-1-152A, and Shin-Etsu OF-206.
2. The optical waveguide of claim 1 , wherein:
a) the depressed-well clad to core radius ratio is about 3.7 to about 3.8;
b) the +Δ is about 0.0032;
c) the −Δ is about −0.0017; and
d) the Δ Tot is about 0.0049.
3. The optical waveguide of claim 1 , wherein the optical waveguide is a single-mode optical fiber.
4. The optical waveguide of claim 1 , wherein the core has a diameter of about 9–12 micrometers.
5. The optical waveguide of claim 1 , having an operating wavelength range between about 1300 to 1650 nm and a cabled cutoff wavelength of less than or equal to 1280 nm.
6. The optical waveguide of claim 1 , having an MFD between greater than or equal to 9.6 when measured at 1550 nm.
7. The optical waveguide of claim 1 , having bend losses less than or equal to 1.0 dB/turn when measured on a 5 mm radius bend at 1625 nm and bend losses that are less than or equal to 1.5 dB/turn when measured on a 5 mm radius bend at 1650 nm.
8. The optical waveguide of claim 1 having bend losses less than or equal to 0.8 dB/turn when measured on a 5 mm radius bend at 1550 nm.
9. The optical waveguide of claim 1 , wherein the inner cladding comprises one or more of the following: fluorosilicate, borosilicate, phosphorus fluorosilicate, phosphorus borosilicate, germanium fluorosilicate or germanium borosilicate composition.
10. An optical device including the optical waveguide of claim 1 .