Method of creating an index grating in an optical fiber and a mode converter using the index grating
AssigneeHer Majesty the Queen in right of Canada, as represented by the Minister of Communications
InventorsKenneth O. Hill, Bernard Malo, Francois Bilodeau, Derwyn C. Johnson
Life of this patent
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Abstract
This invention relates to a method of creating an index grating in an optical fiber comprising disposing a slit mask containing one or more slits over a side of an optical fiber, illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber.
Claims25
A method of creating an index grating in an optical fiber comprising:
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber.
A fiber mode converter comprised of an optical fiber having a core containing an index grating created using the steps
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber.
An optical fiber containing an index grating in which the core of the fiber is Ge-free and is comprised of Eu.sup.2+ :Al.sub.2 O.sub.3 doping formed by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber.
An LP.sub.01 -LP.sub.02 fiber optic mode converter made by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber.
A fiber mode converter comprised of an optical fiber having a core containing an index grating created using the steps
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and
- (c) stepping the relative positions of the optical fiber and the mask in a direction along the axis of the fiber and illuminating successive portions of the fiber following each with a pulse of said ultraviolet light to generate an index grating formed of plural spaced grating lines in said fiber.
A fiber mode converter comprised of an optical fiber having a core containing an index grating created using the steps
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber, the slit mask being angled at a predetermined blaze angle relative to the axis of the optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, including generating the ultraviolet light by means of a laser, and
- (c) continuously moving the fiber axially relative to the mask and flashing the laser at predetermined intervals through said mask to generate an index grating formed of plural spaced grating lines in the core of said fiber.
An optical fiber containing an index grating in which the core of the fiber is Ge-free and is comprised of Eu.sup.2+ :Al.sub.2 O.sub.3 doping formed by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber, the slit mask being angled at a predetermined blaze angle relative to the axis of the optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and generating the ultraviolet light by means of a laser.
An optical fiber containing an index grating in which the core of the fiber is Ge-free and is comprised of Eu.sup.2+ :Al.sub. O.sub.3 doping formed by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and
- (c) stepping the relative positions of the optical fiber and the mask in a direction along the axis of the fiber and illuminating successive portions of the fiber following each with a pulse of said ultraviolet light to generate an index grating formed of plural spaced grating lines in said fiber.
An optical fiber containing an index grating in which the core of the fiber is Ge-free and is comprised of Eu.sup.2+ :Al.sub.2 O.sub.3 doping formed by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber, the slit mask being angled at a predetermined blaze angle relative to the axis of the optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and generating the ultraviolet light by means of a laser, and
- (c) continuously moving the fiber axially relative to the mask and flashing the laser at predetermined intervals through said mask to generate an index grating formed of plural spaced grating lines in the core of said fiber.
An LP.sub.01 -LP.sub.02 fiber optic mode converter made by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber, wherein the slit mask is angled at a predetermined blaze angle relative to the axis of the optical fiber, and
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and generating the ultraviolet light by means of a laser.
An LP.sub.01 -LP.sub.02 fiber optic mode converter mode by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and
- (c) stepping the relative positions of the optical fiber and the mask in a direction along the axis of the fiber and illuminating successive portions of the fiber following each with a pulse of said ultraviolet light to generate an index grating formed of plural spaced grating lines in said fiber.
An LP.sub.01 -LP.sub.02 fiber optic mode converter made by the method
- (a) disposing a slit mask containing one or more slits over a side of an optical fiber, wherein the slit mask is angled at a predetermined blaze angle relative to the axis of the optical fiber,
- (b) illuminating the fiber through the slit mask by substantially monochromatic ultraviolet light for a short interval, whereby an index grating line is created and stored in the core of the fiber, and generating the ultraviolet light by means of a laser, and
- (c) continuously moving the fiber axially relative to the mask and flashing the laser at predetermined intervals through said mask to generate an index grating formed of plural spaced grating lines in the core of said fiber.
Dependencies are inferred from the claim text.