Julian Stone

US Patent:

40408906, Aug 9, 1977

Filed:

Jun 27, 1975

Appl. No.:

5/591178

Inventors:

Charles Andrew Burrus - Fair Haven NJ
Julian Stone - Rumson NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

B01J 1718
B01J 1736

US Classification:

156605

Abstract:

There is disclosed a technique for growing, from a melt, doped single-crystal fibers for use as lasers or other active or passive optical devices of a size that is compatible with proposed optical fiber communications systems. A rod of undoped material has deposited thereon, by mechanical means, a powder or a slurry of a compound of the active ion or other dopant. A melt is formed at the end of the rod with a laser beam and a reduced diameter doped single-crystal fiber is grown or drawn from the melt by pulling with a wire or, when desired crystalline orientation is needed, by pulling with a pointed and oriented seed crystal. The pulling step, at least in the specific case of a neodymium-doped yttrium aluminum garnet (YAG) fiber, is repeated a plurality of times with approximately a 3:1 diameter reduction each time in order to obtain the desired fiber size; but only one deposition of the dopant compound is needed.

US Patent:

42393370, Dec 16, 1980

Filed:

Jun 8, 1979

Appl. No.:

6/046954

Inventors:

Joe C. Campbell - Middletown NJ
Julian Stone - Rumson NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

G02F 109

US Classification:

350151

Abstract:

A magneto-optic modulator of the bounce-cavity type is disclosed wherein the mirrors that are attached to the garnet crystal to provide the reflections are multilayered dielectric mirrors. By polarizing the input beam such that its E vector is perpendicular to the plane of incidence substantially total reflection is achieved from the mirrors and all of the input beam emerges from the garnet crystal. A metal film deposited on a plane of the crystal that is perpendicular to the mirrors permits the establishment of a magnetic field that is substantially parallel to the reflected beams within the crystal. When the field is established by passing current through the film, much of the light is lost during each of the reflections since substantial amounts of the polarized light having polarizations in the plane of incidence are coupled through the dielectric mirrors. Hence the intensity of the output beam is modulated by the current in the metal film.

US Patent:

45156123, May 7, 1985

Filed:

Feb 25, 1983

Appl. No.:

6/469830

Inventors:

Charles A. Burrus - Fair Haven NJ
Julian Stone - Rumson NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

C03B 2000

US Classification:

65 312

Abstract:

A method for manufacturing silica-based optical fiber, and for manufacturing optical fiber preforms, the method comprising deuterium/hydrogen exchange in the silica-based material carried out subsequent to formation of the silica.

US Patent:

54737192, Dec 5, 1995

Filed:

Sep 19, 1994

Appl. No.:

8/308247

Inventors:

Julian Stone - Rumson NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G02B 628

US Classification:

385123

Abstract:

Pulse broadening in a single mode optical transmission system due to wavelength dispersion is reduced by separating the different wavelength components and selectively delaying them. Upon recombination, the original phases of the wavelength components are restored, and the pulses narrowed. By using exclusively single mode devices, essentially lossless operation is realized.

US Patent:

51329760, Jul 21, 1992

Filed:

May 28, 1991

Appl. No.:

7/706135

Inventors:

Yun C. Chung - Aberdeen NJ
David J. DiGiovanni - Scotch Plains NJ
Julian Stone - Rumson NJ
James W. Sulhoff - Ocean NJ
John L. Zyskind - Shrewsbury NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01S 330

US Classification:

372 6

Abstract:

A compact all-fiber, electrically tunable ring laser includes a diodepumped erbium-doped fiber amplifier. The frequency of the laser is tuned by a fiber Fabry-Perot(FFP) etalon that is electrically tuned. An in-line optical isolator is used in conjunction with the FFP to eliminate undesired reflections. A second FFP with a narrow free spectral range (FSR) can be used in conjunction with a first FFP with a wide FSR.

US Patent:

50784684, Jan 7, 1992

Filed:

Apr 24, 1991

Appl. No.:

7/690875

Inventors:

Julian Stone - Rumson NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

G02B 640

US Classification:

385116

Abstract:

This invention is a highly efficient star coupler for use with single mode waveguides. In the inventive coupler, all of the input waveguides and all of the output waveguides are assembled to form two separate bundles. The two bundles are axially aligned with each other and the ends of the bundles are spaced apart. The ends of the waveguides of the bundle of output waveguides are polished to receive optical energy from the bundle of input waveguides. The end facet of the input waveguide bundle is shaped and polished to form a convex spherical surface. The diameter of each waveguide of the bundle is small relative to the diameter of the bundle of waveguides. Therefore, the end facet of each waveguide which makes up the convex spherical surface is angled very slightly relative to the waveguide axis. This slight angle on the end facet of the waveguide acts as a bevel to bend the optical energy coming out of the end of the waveguide. The shape of the end facets of the input waveguides and the spacing between the ends of the input and output waveguides are selected to enable the optical energy from each input waveguide to shine on all of the end facets of the output waveguides with substantially no spill-over of optical energy.

US Patent:

45233152, Jun 11, 1985

Filed:

Apr 9, 1982

Appl. No.:

6/367093

Inventors:

Julian Stone - Rumson NJ

Assignee:

AT&T Bell Laboratories - NJ

International Classification:

H01S 330

US Classification:

372 3

Abstract:

A new Raman gain medium, comprising an optical fiber into which molecular gas has been diffused, is disclosed. This new medium combines the advantages of a fiber, i. e. , long interaction path, low loss, controllable dispersion, and convenience in handling, with the large Raman wave number shift of the gas, i. e. , 4136 cm. sup. -1 for H. sub. 2 in silica. A laser made with such a medium can provide a relatively high power, tunable, coherent signal source in the near and far infrared regions.

US Patent:

50371800, Aug 6, 1991

Filed:

Jul 19, 1990

Appl. No.:

7/555115

Inventors:

Julian Stone - Rumson NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

G02B 610
G02B 520

US Classification:

385123

Abstract:

In this invention there is disclosed an optical filter disposed on an optical fiber. More specifically, a filter comprised of a multilayer thin-film stack of low and high index of refraction material is deposited onto the end of an optical fiber. The filter can be, for example, a long-pass filter, a Fabry-Perot Etalon, a Double-Cavity Filter, and the like. Filters deposited on perpendicular facets of single-mode fibers reflect most of the power that is not transmitted. This reflection if fed back to a laser or an amplifier can cause a problem, particularly if an isolator does not adequately block the reflections. A bevel on the fiber end face can eliminate this problem by preventing the reflected power from being directed back into the optical fiber.