Abstract: A cutting device for cutting an optical fiber running in a first direction includes a supporting piece having a free end and a fixed end and having resilience, a cutting blade supported by the supporting piece that comes into contact with the optical fiber to make a right angle with the optical fiber at a point of the contact, and a driving device. The driving device is configured to press the supporting piece in a second direction in a plane perpendicular to the first direction, with the second direction not intersecting with the first direction.

Abstract: A quartz glass tube as a semi-finished product for an optical component that has an inner bore extending along a tube centre axis for the acceptance of a core rod and a tube wall limited by an inner casing surface and an outer casing surface is already known; within said tube wall an inner region made of a first quartz glass and an outer region made of a second quartz glass with a different index of refraction surrounding the inner region contact one another at a contact surface which runs around the centre axis. In order to provide a quartz glass on this basis that facilitates the production of optical components for special applications such as laser-activated optical components in wand or fibre form, the invention states that the contact surface has a non-round course in the radial cross-section and the inner casing surface has a circular course.

Abstract: An optical fiber end processing method includes the steps of: an optical fiber fixing step of fixing two parts of the optical fiber; a first heating step of heating a tip end side part of the optical fiber between two fixed parts fixed in the optical fiber fixing step, and melting the optical fiber of the tip end side heating part; a second heating step of heating a part on a base end side of the optical fiber between the fixed parts away from the tip end side heating part in a state that two parts of the optical fiber are fixed, and making the holes of the optical fiber disappear; and a removing step of removing the tip end side heating part after the second heating step.

Abstract: A method of producing a conversion element includes forming a preform from a glass, reshaping the preform into a structured glass fiber using a structuring element, and dividing the glass fiber into conversion elements.

Abstract: A glass cutting line includes a cutting table having a movable cutting head cutting glass work pieces on the table and a conveyor for moving glass work pieces onto and off of the cutting table The line includes a loader adjacent the cutting table having a loader table, a loader table conveyor, and a table loader unit receiving and delivering glass work pieces to the loader table. The loader table conveyor transports the glass work pieces to the cutting table. The line includes a cassette work piece storage and retrieval unit positioned vertically below the loader table when the loader table is positioned to transport the glass work pieces to the cutting table. The cassette work piece storage and retrieval unit receives work pieces from the cutting table and delivers work pieces to the cutting table from any of a plurality of storage locations.

Abstract: Provided is a glass base material elongation method for elongating a glass base material with a large diameter to manufacture a glass rod with a smaller diameter, the method comprising, when elongating a glass base material that has a transparent glass tapered portion at one end of a trunk portion and a glass tapered portion including a non-transparent glass portion at the other end of the trunk portion, prior to the elongation, fusing a hanging dummy to an end of the transparent glass tapered portion, setting the hanging dummy in communication with a feeding mechanism, inserting the glass base material into a heating furnace beginning with the other end, and performing elongation.

Abstract: The present invention refers to a drawing method for producing cylindrical components of quartz glass in that a quartz glass strand is drawn off in the direction of a drawing axis from a shaping zone of soft quartz glass mass and sections having a cutting length are separated from the quartz glass strand, and the cylindrical components are produced from the sections.

Abstract: A method of cleaving an optical fiber using a disposable abrasive film is disclosed. The method includes preparing an end of an optical fiber by exposing a length of the optical fiber. The exposed optical fiber is brought into contact with a tangential swipe formed of abrasive film to cause the optical fiber to cleave substantially at the location of contact leaving an optical fiber stub with a cleaved end. The optical fiber stub is polished with a polishing film having a coarse grit and may be polished a second time with a polishing film having a fine grit.

Abstract: A method of processing an optical fiber includes introducing fiber that has passed a pulling mechanism to a shredding unit with an introducing unit. The introducing unit includes a movable unit including a notch configured to fit with a capstan roller included in the pulling mechanism, a sliding mechanism that attaches the movable unit slidably with respect to a main body of the introducing unit, and a restoring mechanism configured to restore the movable unit to an initial position when the movable unit has slid. The method includes shredding the fiber introduced by the introducing unit into fiber pieces, and suctioning, carrying, and collecting the fiber pieces. A method of drawing an optical fiber includes drawing the fiber while controlling a drawing speed, adjusting a diameter of the fiber to a diameter passable through a die, and arranging the die around the fiber having the diameter passable through the die.

Abstract: An optical fiber preform manufacturing method includes: supporting a drilling jig in a radial direction of a preform that is cylinder-shaped; moving the drilling jig in a longitudinal direction of the preform; and forming a plurality of slits each extending in the longitudinal direction and each directed from an outer side of the preform toward a center the preform, and a plurality of holes each extending in the longitudinal direction and each connecting with an end of one of the plurality of slits in a depth direction of the one of the plurality of slits.

Abstract: A method of cleaving an optical fiber and apparatus therefor including a hand tool wherein the optical fiber to be cleaved (6) has a natural path. The method of cleaving includes deflecting the optical fiber (6) away from its natural path in a first direction and at a point spaced longitudinal along the length of the fiber deflecting the optical fiber in a second direction opposed to the first direction. The opposing deflection induce internal stresses in the fiber that extend substantially across the core of the optical fiber over a region of the length of the optical fiber. The fiber may then be scratched in this region with a cleaving blade (5) so as to induce cleaving of the optical fiber. The cleaving is controlled by controlling the internal stresses induced in the fiber by in turn controlling the degree of deflection induced in the fiber. Further the fiber (6) may be placed under extension to assist in the control of the stresses induced.

Abstract: Optical devices, components and methods for mounting optical fibers and for side-coupling light to/from optical fibers using a modified silicon V-groove, or silicon V-groove array, wherein V-grooves, which are designed for precisely aligning/spacing optical fibers, are “recessed” below the surface of the silicon. Optical fibers can be recessed below the surface of the silicon substrate such that a precisely controlled portion of the cladding layer extending above the silicon surface can be removed (lapped). With the cladding layer removed, the separation between the fiber core(s) and optoelectronic device(s) can be reduced resulting in improved optical coupling when the optical fiber silicon array is connected to, e.g., a VCSEL array.

Abstract: Optical fibers comprising a plurality of cleaved facets disposed at one end are disclosed. First and second facets of the plurality of cleaved facets are disposed at different angles. The optical fiber with the plurality of cleaved facets splits light from an optical component between an optical fiber core and a detector such that a portion of the light may be tapped off for monitoring. The first cleaved facet is disposed at a first angle such that a first portion of the light from an optical component is totally internally reflected into the fiber core. A second cleaved facet can be disposed at a second angle that is less than the first angle so that a second portion of light from the optical component refracts through the second facet to a detector. Methods of forming and using angle-cleaved optical fibers having a plurality of cleaved facets are also disclosed.

Abstract: An optical fiber preform manufacturing method includes: supporting a drilling jig in a radial direction of a preform that is cylinder-shaped; moving the drilling jig in a longitudinal direction of the preform; and forming a plurality of slits each extending in the longitudinal direction and each directed from an outer side of the preform toward a center the preform, and a plurality of holes each extending in the longitudinal direction and each connecting with an end of one of the plurality of slits in a depth direction of the one of the plurality of slits.

Abstract: In a known method for producing tubes of quartz glass, a hollow cylinder (2) of quartz glass is continuously supplied to a heating zone (1) and is softened therein in regions, and a tube strand (21) is drawn off at a drawing speed from the softened region with formation of a drawing bulb (26), and the tubes to be produced are cut to length in the form of tube strand pieces by separating the tube strand (21) at a desired separation point (T, Vu, Vo) and an internal pressure differing from the external pressure applied to the outer cladding is maintained in the inner bore (4) of the hollow cylinder (2) in that the inner bore (4) of the tube strand is provided with a flow obstacle.

Abstract: A glass base material, which is a base material of an optical fiber, comprising: a core; and a clad surrounding the core; wherein: a rate of change in a relative-refractive-index-difference between the core and the clad in a longitudinal direction of the glass base material is substantially 6% or less.

Abstract: Marker grooves of an optical fiber are formed by a marker groove forming device including at least, on a substrate, a fiber guide and optical fiber pressing springs formed on a side wall surface in the fiber guide. The optical fiber pressing springs include edges contacted and pressed to the side of an optical fiber stored in the fiber guide, and plate springs for pressing the edges to the side of the optical fiber with fulcra on the side wall surface in the fiber guide. The optical fiber is pressed to a side wall surface in the fiber guide, and the edges are formed at a predetermined distance from each other.

Abstract: Optical devices, components and methods for mounting optical fibers and for side-coupling light to/from optical fibers using a modified silicon V-groove, or silicon V-groove array, wherein V-grooves, which are designed for precisely aligning/spacing optical fibers, are “recessed” below the surface of the silicon. Optical fibers can be recessed below the surface of the silicon substrate such that a precisely controlled portion of the cladding layer extending above the silicon surface can be removed (lapped). With the cladding layer removed, the separation between the fiber core(s) and optoelectronic device(s) can be reduced resulting in improved optical coupling when the optical fiber silicon array is connected to, e.g., a VCSEL array.

Abstract: An optical fiber array substrate 11 has, in one surface thereof, eight V-grooves 12 for securing eight optical fibers 14 aligned in parallel to each other, and V-shaped side grooves 13 formed outside of the respective outermost V-grooves 12 located at the opposite sides of the substrate 11. The apexes of the outside ridges 12c and 12d defining the outermost V-grooves 12 are at the same height as the apexes of the inside ridges 12a and, the height of the bottom 13a of the side groove 13 is lower than that of a contact point 12e between the ridge line of the V-groove 12 and optical fiber 14.

Abstract: A process for preparing terminated fibers comprising: (a) positioning at least one fiber in a ferrule such that a portion of the fiber extends beyond the mating face of the ferrule; (b) affixing the fiber relative to the ferrule; and (c) cleaving the portion of the fiber.

Abstract: A plurality of optical fibers are bundled, and the fiber bundle is cut at a part of a mouthpiece which is fixed on an intermediate part of the fiber bundle. Thus, the fiber bundle is divided into a first optical fiber bundle and a second optical fiber bundle. Division surfaces of the first and second optical fiber bundles have the same properties and condition since the first and second optical fiber bundles are formed of the fiber bundle that is obtained by bundling the same optical fibers. The first optical fiber bundle is assembled in an insertion section of an endoscope and the second optical fiber bundle is assembled in a flexible tube, and a first light guide in the insertion section of the endoscope and a second light guide in the flexible tube are formed. Thereby, a separable light transmission path of the light guide is formed.

Abstract: A field-installable connector includes a connector housing and a ferrule having front and rear opposed faces and at least one fiber bore defined longitudinally therethrough. A laser processed stub optical fiber is disposed within the one fiber bore of the ferrule and extends a predetermined distance beyond the rear face of the ferrule. An alignment feature is operable for self-centering the stub optical fiber and a field optical fiber to perform a mechanical splice using a camming means. A method of laser processing a stub optical fiber includes rotating the stub optical fiber and sweeping a laser beam directed at a desired angle back and forth across a surface of the optical fiber. An oscillating motion of the laser is driven by an intermittent sinusoidal signal that results in two deposits of energy onto the stub optical fiber followed by a cooling period before subsequent deposits of energy occur.

Abstract: A glass tube for use in an optical fiber preform is produced by applying a first soot on an end face of a starting member to form an elongated, porous cylindrical soot core having a first density, and applying a second soot including SiO2 on the periphery of the soot core to form a porous soot cladding having a second density greater than that of the soot core at the periphery of the core. The core and the cladding are later heated together at a temperature sufficient for sintering to form a core glass and a cladding glass. Because the soot core collapses at a greater rate than the soot cladding during sintering, the core glass separates or delaminates radially from the cladding glass. The core glass is then removed from the surrounding cladding glass, and the latter is treated to provide a high purity glass tube suitable for use as part of an optical fiber preform.

Abstract: A GRIN fiber lens is fabricated by the steps of providing a graded index glass preform, thinning the graded index preform to remove a sufficient thickness of the graded glass to establish a desired ?n, and drawing a graded index optical fiber from the thinned graded index preform. Thinning, in this context, refers to removal of graded index glass from the outside of the graded index preform so as to reduce its outer diameter. The thinning thus changes ?n which is the refractive index difference between the center of the preform and its outer surface. The graded index preform can be provided by MCVD deposition followed by removal of the starting tube glass, by OVD deposition, by VAD, or by ion exchange fabrication. The thinned graded index preform is advantageously annealed before drawing in order to minimize ripple. And, in a variation of the process, an overcladding can be applied over the thinned graded preform before draw for further adjustment or control of the ?n.

Abstract: To provide a method and apparatus for parting a glass rod without causing a crack or rupture at a grasped root portion of the glass rod in parting the glass rod for producing a glass preform. The apparatus for parting the glass rod in a predetermined length by grasping both ends of the glass rod 11 is characterized by comprising a supporting unit 18 of Y-character shape for supporting an intermediate position between both ends of the glass rod 11 from the lower part, the supporting unit 18 having a carbon sleeve composed of a cylindrical body that is rotatable around each of two leg portions making up a forked leg portion as an axis, the carbon sleeve being rotatable along with an axial movement of the glass rod.

Abstract: An optical display panel which provides improved light intensity at a viewing angle by redirecting light emitting from the viewing screen, and a method of making a light redirective display panel, are disclosed. The panel includes an inlet face at one end for receiving light, and an outlet screen at an opposite end for displaying the light. The inlet face is defined at one end of a transparent body, which body may be formed by a plurality of waveguides, and the outlet screen is defined at an opposite end of the body. The screen includes light redirective elements at the outlet screen for re-directing light emitting from the outlet screen.

Abstract: A method and apparatus for automatic threading and winding of optical fiber onto various components in a fiber draw system, as well as methods and apparatus for conducting online tensile screening of optical fiber at high speeds. In a preferred embodiment, the fiber is tensile tested during fiber draw and wound directly onto a shipping spool to be shipped to a customer. The tensile stress can be imparted to the fiber during the draw process by feeding the fiber through a screener capstan, which works in conjunction with another capstan to impart the desired tensile stress to the fiber during the draw process.

Abstract: A method for the pregobbing of an optical fiber preform to provide pre-optimized tip taper and system for drawing optical fiber therefrom. The downtime of an optical fiber drawing apparatus can be considerably shortened, by providing preforms that have a pre-optimized tip shape. Pre-optimized tips are provided which are melted off at the tip by an induction heater of a heating furnace. Preferably, the pregobbing furnace has substantially the same temperature profile as the draw furnace. Therefore, because the tip of the preform is optimized and unusable glass has been removed, throughput of the draw apparatus is advantageously increased. Moreover, the shape of the tip of the preform is optimized in that it has been exposed to the same temperature profile as it would have seen had the draw tip been formed in the draw furnace.

Abstract: To provide a method and apparatus for parting a glass rod without causing a crack or rupture at a grasped root portion of the glass rod in parting the glass rod for producing a glass preform.

Abstract: The method is designed to be implemented in an installation provided with means enabling a preform held between two points by supporting end-pieces to be rotated and to be moved in translation. Heater means for heating the preform by means of a plasma torch are associated with material supply means, so as to enable the preform to be manufactured in layers. Preform/torch relative displacements, with or without material being supplied, lead either to a new layer of material being deposited on the preform, or to the most recent layer deposited being glazed. Said method interposes a one-ended reduction in layer length, starting from one of the intermediate layers, while a succession of concentric layers are being deposited on the preform in a manner such that the lengths of the layers are progressively reduced so that the preform tapers towards it ends. The one-ended reduction leads to a limitation of the thickness of a determined segment at the level of the layer deposited immediately prior to the reduction.

Abstract: An end heating and processing method of an optical fiber preform. In this method, an optical fiber preform is processed by heating and melting an end of a vitrified optical fiber preform including a core portion and a cladding portion formed on an outer circumference thereof to process the end having a shape for drawing as an optical fiber.

Abstract: A method produces homogenous quartz glass plates without streaks. The method is applied to starting quartz glass body which has an X—X geometrical axis and good refractive index homogeneity in its central area, and a refractive index homogeneity decreasing as the axis lies further from a central area. The body is divided into at least two concave parts by longitudinal cuts parallel to the axis once the central area has been processed out of the body. The parts are placed separately in corresponding molds and heated therein such that they are molded to form quartz glass plates having a desired thickness.

Abstract: A cylindrical silver-activated phosphate glass base material 2 is placed inside a heater 1. The upper end of this base material 2 is set in a supporting section 3, and an extending section 4 provided in vertically movable fashion by means of a drive device is attached to the lower end thereof. As the base material 2 is softened by the heating of the heater 1, and the extending section 4 is lowered by operating the drive device, the base material 2 is extended and assumes a thin bar shape. The extension rate of the extending section 4 driven by the drive device is controlled by an external diameter control section 5, while detecting the external diameter, in such a manner that the external diameter of the extended portion is uniform. The extended portion 6 of the base material 2 is cut to uniform lengths, and the cut faces thereof are polished by a polishing device, thereby yielding a cylindrical dosimeter glass element 7a.

Abstract: The invention describes a procedure for manufacturing photonic crystals and passive and active optoelectronic device components comprising of photonic crystals. The manufacturing approach draws upon the mature technology of producing microchannel plates (MCPs). Based on this manufacturing approach, photonic crystal structures with or without defects can be fabricated. The photonic band gaps produced in the presented invention can be made passive or active. A photonic crystal structure is described that contain different photonic band gap regions. Additionally, photonic crystal structures filled with different refractive indexes are described. The photonic crystals of the present invention maybe used as filters, phase shifters, splitters, couplers, multiplexers, demultiplexers, modulators, variable optical attenuators, gain equalizers, etc. for optical communication applications.

Abstract: A method for fusing an optical fiber preform comprises fusing the preform while blowing an oxidative gas against the preform to be fused from upper and lower directions of a fusing burner unit. An apparatus for carrying out the method includes a plurality of nozzles for preventing deposition of silica cloud, which are each set at an angle, &thgr;, of blowing the oxidative gas relative to the preform being drawn such 20°≦&thgr;≦60°.

Abstract: An apparatus for conducting a fusion process includes a first chamber and a second chamber which maintains an atmosphere that is substantially free of oxygen. A closeable passage connects the second chamber and the first chamber and selectively provides substantial isolation of the second chamber from the first chamber. A filament normally disposed in the second chamber is moveable between the second chamber and the first chamber when the closeable passage is in an open position.

Abstract: A method of optical fiber preparation includes concurrently processing a plurality of optical fibers which have a substantially vertical orientation, and the concurrent processing is substantially automated.

Abstract: An apparatus and method for cleaving optical waveguides to precise differential length are described. A first end of a waveguide is coupled to an input port of a reflectometer. A reference mirror is then positioned in a path of radiation propagating through the second end of the waveguide. A waveguide cutting tool is then positioned proximate to the waveguide and at a distance relative to a reference mirror. A first reflectometry measurement is performed on the waveguide to a second end of the waveguide. A second reflectometry measurement is performed on the waveguide to the reference mirror. The waveguide is then positioned relative to the reference mirror and waveguide cutting tool so that the first reflectometery measurement is a measurement increment apart from the second reflectometry measurement. The waveguide is then cut with the cutting tool positioned at the distance relative to the reference mirror.

Abstract: An optical fiber with a non-circular cross-section is realized by creating a void having the desired cross-section in a housing and filling the void with an optical material. This structure is then collapsed to solidify it and drawn to desired dimensions. The optical material may be rods, soot or ground material.

Abstract: The present invention relates to a method for terminating the end of an optical fiber. In particular the present invention relates to a method for forming a low reflectance termination on an end of an optical fiber. The method including the step of tensioning the optical fiber between two spaced apart points thereon. The method further including the step of moving a ball termination torch from a given location in a given direction with respect to the fiber such that a potion of the flame therefrom intercepts the fiber and severs the fiber into two pieces each having a tapered end. The method further includes the steps of retracting at least one of the tapered ends a predetermined distance in a direction away from the other of the tapered ends and continuing to move the torch such that the flame heats the at least one of the tapered ends to cause it to become shortened.

Abstract: A process for producing sized glass yarns, which entails: a) drawing streams of molten glass from orifices located at a bottom of one or more dies, in a form of one or more fans of continuous filaments, b) assembling the filaments into one or more moving supports, wherein a first stable composition having a viscosity of between 0.5 and 250 cP is deposited onto the surface of the continuous filaments, and a second stable composition, supplied separately from the first and having a viscosity of between 0.5 and 300 cP, is deposited onto the surface of the filaments of the yarns, at the earliest during deposition of the first composition and at the latest during collection of the years, the difference in viscosity between the two compositions deposited being less than 150 cP, the mixture of the deposited compositions functioning as a sizing composition and being polymerizable at room temperature.

Abstract: An improved process for fabricating a refractory dielectric article, in particular silica optical fiber, is provided. The fabrication process involves joining of two elongated bodies—typically silica preforms—end-to-end by use of an isothermal plasma torch technique. A long preform made in this manner allows drawing of optical fiber with less down-time and waste than current processes. The plasma torch technique also produces low perturbations within the resultant preform, thereby increasing the amount of usable fiber.

Abstract: An end heating and processing method of an optical fiber preform. In this method, an optical fiber preform is processed by heating and melting an end of a vitrified optical fiber preform including a core portion and a cladding portion formed on an outer circumference thereof to process the end having a shape for drawing as an optical fiber.

Abstract: A method for preparing a fiber optic cable for a splice wherein a radial compressive strain is applied to the fiber optic cable and the fiber optic cable is cut adjacent to the applied radial compressive strain to create a splice end of the fiber optic cable having a convex bulb. A corresponding device for preparing a fiber optic cable for a splice comprises a cutting means for cutting a fiber optic cable into a waste end and a splice end and a collet for applying a radial compressive strain to the fiber optic cable adjacent to the cutting means of the tool.

Abstract: An apparatus and method used in manufacturing a long period grating filter are provided. The apparatus used in manufacturing a long period grating filter includes an upper body including a plurality of teeth spaced from each other by a predetermined distance and a lower body having teeth spaced from each other by the same distance as the teeth of the upper body and a plurality of grooves in a direction perpendicular to the teeth in which an optical fiber is loaded, wherein the upper and lower bodies are engaged with each other, and a plurality of grooves are formed in the loaded optical fiber by abrading the loaded optical fiber by moving the upper body in a direction parallel to the teeth. According to the present invention, an excimer laser, various other expensive equipment, and an optical fiber sensitive to ultraviolet rays are not required for manufacturing the long period grating filter. Accordingly, complicated hydrogen processing is not necessary.

Abstract: A method for drawing a mother ingot into a preform for optical fibers comprises providing a mother ingot, subjecting the mother ingot to measurement of a distribution of refractive index along radial directions thereof to determine a ratio of a core diameter to a clad diameter, and comparing the thus determined ratio with a predetermined ratio between the core diameter and the ingot diameter which ensures intended optical transmission characteristics, under which if the determined ratio is insufficient for the intended light transmission characteristics, the mother ingot is further processed until the predetermined ratio is substantially attained, and the resultant ingot is drawn to a preform, or if the determined ratio is acceptable on comparison with the predetermined ratio, the mother ingot is finally drawn.

Abstract: A method of making a fiber having a single mode absorptive core whose position relative to the cross sectional plane of the inner multimode cladding varies along the length of the fiber. A groove or grooves are made in the outer cladding of the preform. When fiber is drawn from the grooved preform, the position of the core does not follow the centerline of the fiber; the position within the fiber varies in accordance with the grooves.

Abstract: The method of manufacturing a preform having a supporting core by effecting successive passes with a plasma torch while material is being supplied, and by effecting at least one glazing step with the plasma torch and without material being supplied includes:a) a first glazing step effected at slow speed from a first end of the preform to the second end thereof;b) pre-separation of the preform adjacent to the first end, thereby reducing its diameter to substantially that of the supporting core;c) a second glazing step effected from the first end to the second end of the preform; andd) complete separation of the preform at the place of pre-separation.

Abstract: The invention relates to a method of performing surface treatment on a preform manufactured in an installation for manufacturing or building up preforms having supporting cores, the installation including at least rotation means having a horizontal axis of rotation and two mounting points between which the supporting core of the preform to be manufactured or built up is mounted, plasma-torch and material-supply means disposed radially relative to the supporting core and mounted to move in axial translation relative to and parallel to the supporting core so as to make the preform around the supporting core, the preform being manufactured or built up by effecting successive passes with the plasma torch while material is being supplied.

Abstract: A method and apparatus for curved-angle cleaving of optical fibers. The method requires the introduction of a flaw in an optical fiber to be cleaved, and the application of predetermined stress and strain to the optical fiber in the vicinity of the flaw to cause curved-angle cleaving of the optical fiber at the flaw. The apparatus of the present invention includes first and second pairs of optical fiber clamps separated by first predetermined distance, a flaw-producing device that produces a flaw in a fiber clamped between the clamps, and a force-applying device that applies a substantially concentrated force to the fiber at a second predetermined distance from the first pair of clamps, the flaw-producing device being located between the force-applying device and the second pair of optical fiber clamps at third predetermined distance from the force-applying device. The first, second and third predetermined distances are selected in order produce a curved-angle cleave in the optical fiber.