Michael L Pearsall

US Patent:

61314153, Oct 17, 2000

Filed:

Jun 20, 1997

Appl. No.:

8/879348

Inventors:

Kai Huei Chang - Suwanee GA
David Kalish - Roswell GA
Thomas John Miller - Alpharetta GA
Michael L. Pearsall - Alpharetta GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

C03B 37027

US Classification:

65391

Abstract:

A singlemode optical fiber 700 having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod 20 is fabricated using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7. 5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosphere at about 1200. degree. C. to reduce the amount of OH present to less than 0. 8 parts per billion by weight, and then consolidated in a helium atmosphere at about 1500. degree. C. to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube 40 having a suitably low OH content. Thereafter, the tube is collapsed onto the rod to create a preform 60.

US Patent:

49001264, Feb 13, 1990

Filed:

Jun 30, 1988

Appl. No.:

7/213876

Inventors:

Kenneth W. Jackson - Snellville GA
Gregory A. Lochkovic - Lawrenceville GA
Parbhubhai D. Patel - Dunwoody GA
Michael L. Pearsall - Duluth GA
James R. Petisce - Norcross GA

Assignee:

American Telephone & Telegraph Co. - Murray Hill NJ
AT&T Bell Laboratories, AT&T Technology, Inc. - Berkeley Heights NJ

International Classification:

G02B 644

US Classification:

350 4623

Abstract:

A bonded optical fiber array (20) includes a parallel coplanar array of longitudinally extending contacting optical fibers (22--22). Each optical fiber is enclosed in inner and outer layers of coating materials and is provided with a color identifier. The inner layer is comprised of a UV curable bonding material having a modulus in the range of about 1 M Pa. For mechanical protection, the outer layer is a UV curable bonding material having a modulus in the range of about 1 GPa. When the optical fibers are disposed in the parallel array, interstices are created between the fibers and between the fibers and an envelope which is spaced no further than about 25. mu. m at its closest point to each fiber. A UV curable matrix bonding material which has a modulus having a value less than that of the outer coating layer on the fiber and more than that of the inner coating layer fills the interstices, extends to the peripheral line which defines the envelope and bonds together the optical fibers. The modulus of the matrix material and the bond of the matrix material to the color identifier on the optical fibers is such that interfiber and interribbon movement is allowed.