Some embodiments may include a fiber laser including two or more input fibers and an output fiber to deliver a beam to a workpiece, the fiber laser comprising. The fiber laser may include a combiner having ends and a length, wherein the combiner is arranged to release, from its length, a portion of back-reflected light received from the output fiber at an output end of the ends from the combiner, the combiner including: a capillary tube to enclose part of the two or more input fibers at an input end of the ends of the combiner, the capillary tube having ends and a length located between the ends of the capillary tube; and a cladding light stripper (CLS) defined by part of the length of the capillary tube, wherein the CLS provides the release of the portion of the back-reflected light. Other embodiments may be disclosed and/or claimed.

A system for monitoring a signal on an optical fiber includes a fiber optic connector having a housing couplable to a receptacle. An optical fiber that transmits a first optical signal has first fiber core at least partially surrounded by a cladding and has a first end terminating proximate the housing. The first optical signal is transmitted along the first fiber core. An optical tap has a first tap waveguide arranged and is configured to receive at least part of the first optical signal as a first tap signal. The first tap waveguide comprises an output port for the first tap signal for directing the tap signal to a detector unit. In other embodiments, a detector unit detects light from the optical signal that is propagating along the fiber cladding.

A system may include a splice housing positioned along a portion of tubing in a wellbore and a splice housing protector around the splice housing. An uphole fiber optic cable may extend through the splice housing protector. The uphole fiber optic cable may mate with a first port of the splice housing at a downhole end of the splice housing protector. A downhole fiber optic cable may mate with a second port of the splice housing in the splice housing protector. The splice housing may splice the uphole fiber optic cable and the downhole fiber optic cable.

Fiber optic tapered coupler and methods of manufacturing same. One method of manufacturing a fiber optic tapered coupler arrangement includes providing an output fiber having a first end and a second end opposite the first end. The method also includes applying heat to the first end of the output fiber, wherein the first end expands forming a taper at the first end of the output fiber. The method also includes splicing the tapered first end of the output fiber to a first end of an input fiber, wherein a non-tapered portion of the output fiber has a first diameter and the input fiber has a second diameter different from the first diameter.

The present disclosure relates to various types of optical fibers that are spliced together with a splice protector provided to house the spliced optical fibers. The splice protector has dimensions that enable improved mechanical properties of the spliced optical fiber.

A method of optimizing the coupling to an optical fiber, including: generating a femtosecond laser pulse; directing a focus of the laser pulse to a longitudinal depth in the region beneath the endface of the optical fiber to generate microvoids; adjusting the intensity of the laser pulse at different depths, such that a refractive index profile is created in the region beneath the endface of the optical fiber.

A laser device includes: a laser unit that outputs laser light; an output end that launches the laser light; a first fusion splice portion; and a second fusion splice portion. In each of the first fusion splice portion and the second fusion splice portion, two multi-mode fibers are fusion-spliced. Each of the two multi-mode fibers include a core through which the laser light propagates and a cladding that surrounds the core. The first fusion splice portion is disposed closer to the laser unit than is the second fusion splice portion. At least a part of the core in the first fusion splice portion contains a dopant that is the same type as a dopant contained in the cladding in the first fusion splice portion for decreasing a refractive index.

A laser device includes: a laser unit that outputs laser light; an output end that launches the laser light; a first fusion splice portion; and a second fusion splice portion. In each of the first fusion splice portion and the second fusion splice portion, two multi-mode fibers are fusion-spliced. Each of the two multi-mode fibers include a core through which the laser light propagates and a cladding that surrounds the core. The first fusion splice portion is disposed closer to the laser unit than is the second fusion splice portion. At least a part of the core in the first fusion splice portion contains a dopant that is the same type as a dopant contained in the cladding in the first fusion splice portion for decreasing a refractive index.

A fiber optic fanout assembly includes: a fiber optic trunk cable comprising a plurality of optical fibers within a surrounding jacket; a fanout housing with an internal bore and rear and front end portions, the fanout housing receiving the optical fibers from the trunk cable within the internal bore though the rear end portion; a plurality of furcation tubes, each containing one or more of the optical fibers; a first sealing structure that creates a first seal between the fanout housing and the jacket of the fiber optic cable; a first disk having a plurality of holes, the first disk mounted to the front end portion of the fanout housing, wherein the furcation tubes and optical fibers residing therein are inserted into the holes in the first disk; and a plurality of second sealing structures, each of which provides a second seal between the furcation tubes and the first disk.

A fiber optic fanout assembly includes: a fiber optic trunk cable comprising a plurality of optical fibers within a surrounding jacket; a fanout housing with an internal bore and rear and front end portions, the fanout housing receiving the optical fibers from the trunk cable within the internal bore though the rear end portion; a plurality of furcation tubes, each containing one or more of the optical fibers; a first sealing structure that creates a first seal between the fanout housing and the jacket of the fiber optic cable; a first disk having a plurality of holes, the first disk mounted to the front end portion of the fanout housing, wherein the furcation tubes and optical fibers residing therein are inserted into the holes in the first disk; and a plurality of second sealing structures, each of which provides a second seal between the furcation tubes and the first disk.