Abstract:
A device and method are for separating at least one optical fiber. A swivelled element and an asymmetric anvil are used so that a section of the fiber is contacted only in two positions that are substantially insignificant for the tensile strength of a spliced fiber. In one position, the glass fiber core of the section of the fiber is protected from damages by a fiber sheathing. In the other position that is contiguous to the position of separation, mechanical damages are of minor importance since they are at least partially repaired by the heat produced during splicing.

Description:
[0001]    This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/DE02/02186 which has an International filing date of Jun. 14, 2002, which designated the United States of America and which claims priority on German Patent Application number DE 101 37 227.2 filed Jul. 30, 2001, the entire contents of which are hereby incorporated herein by reference. 
     
    
     
       FIELD OF THE INVENTION  
         [0002]    The invention generally relates to an apparatus for separating at least one optical fiber. Preferably, it relates to one in which mechanically sensitive areas of the fiber to be separated or cut can be moved into the separating or cutting apparatus essentially without any contact.  
         BACKGROUND OF THE INVENTION  
         [0003]    In the age of modern communication and information technology, optical data transmission by way of glass fiber cables plays a critical role. The design of reliable optical networks is dependent on the capability to cut glass fiber cables, which are also referred to in the following text as optical fibers or optical waveguides, such that a defined end surface, in particular an end surface which is as planar as possible, is produced at the end of the cut glass fiber cables. Planar end surfaces are required, for example, for splicing, that is to say thermal connection of two glass fiber cables to form a new, longer glass fiber cable, when the spliced joint is intended to result in the optical losses being as low as possible. Planar end surfaces are likewise required for low-loss optical coupling between an optical fiber and an optical connector or an optical coupling.  
           [0004]    Optical fibers are generally cut by positioning the glass fiber at the point to be cut parallel over an anvil in an apparatus for cutting optical fibers, and by scoring it at right angles to the glass fiber. This can be done by using a scoring apparatus. When the optical fiber is subsequently bent, it preferably breaks at the scoring point. High-quality cutting apparatuses for glass fibers are in consequence distinguished in that the broken surface, which runs at right angles to the glass fiber axis, is as planar as possible, and in that the broken surface quality is subject to as few fluctuations as possible over a large number of cutting processes.  
           [0005]    DE 33 17 304 A1 discloses an apparatus for cutting optical waveguides, which allows a high broken surface quality to be achieved, that is to say the broken surfaces of cut glass fibers are essentially free of disturbing notches, scratches and other uneven features. The high broken surface quality is achieved by providing a slot in an anvil, thus producing a symmetrical stress distribution in the cross section of the glass fiber at the scoring point. In this case, the width of the slot is governed by the diameter of the fiber to be cut.  
           [0006]    DE 33 22 127 A1 discloses a method and an apparatus for cutting optical waveguides, in which the optical waveguide to be cut is held firmly with the aid of two clamping devices, is prestressed over an anvil in the axial direction with the aid of a tensioning device, and is scored transversely axially at the cutting point on the anvil with the aid of a scoring device. Manual intervention during the operation of the cutting apparatus is largely precluded, in order to ensure that the quality of the broken surfaces that are produced during the cutting process is uniformly high. This is achieved by way of a common operating element, by which the scoring device, the clamping devices and the tensioning device are each moved against a spring force to a position such that the clamping devices, tensioning device and the scoring device are operated autonomously and successively after the insertion of the optical waveguide to be cut and when the load on the operating element is removed.  
           [0007]    Furthermore, WO 99/47954 discloses a cutting apparatus for optical fibers, which has a control device, which can be operated manually, as well as functional elements for successive clamping, scoring and breaking of the fibers.  
           [0008]    All the functional elements are operated by way of the control device. Transmission elements and spring elements are provided between the, control device and the functional elements, and allow the functional elements to be moved in a defined sequence as a function of the forward and return movement of the control device.  
           [0009]    EP 0 528 636 A1 discloses an apparatus both for cutting and for splicing optical waveguides, in which, after a cutting process, the optical waveguides to be spliced can be transferred by means of a transfer apparatus, which can pivot, from the cutting apparatus in the correct orientation to the splicing apparatus.  
           [0010]    U.S. Pat. No. 4,463,886, DE 29 19 121 and U.S. Pat. No. 6,122,936 each disclose cutting apparatuses for optical waveguides, in which the optical waveguides are slightly curved before the scoring process. As a result of the mechanical stress which is caused in the optical waveguide by the bending process, the optical waveguide is broken by the scoring process, resulting in a largely planar optical waveguide end surface.  
           [0011]    The known cutting apparatuses for optical fibers have the disadvantage that the fiber is inserted into the cutting apparatus manually, so that there is a risk of the cylindrical outer surface of the cylindrical fiber being mechanically damaged, particularly in the vicinity of the cutting point. This thus considerably reduces the tensile strength of the spliced glass fibers.  
         SUMMARY OF THE INVENTION  
         [0012]    An embodiment of the invention is therefore based on an object of providing an apparatus and a method for cutting at least one optical fiber. As such, the risk of mechanical damage to the optical fiber to be cut, particularly in the vicinity of the cutting point, is reduced.  
           [0013]    An object may be achieved by an apparatus for cutting at least one optical fiber. The apparatus according to an embodiment of the invention accordingly has a contact element and an element which can pivot, is mounted on a rotation shaft such that it can pivot relative to the contact element, and can pivot between an insertion position and a cutting position. A holding apparatus with an interruption is fitted to or formed on the element which can pivot, so that a single fiber can be held in a defined position on the element which can pivot. A scoring device is fitted to the contact element such that a fiber which is held by the holding apparatus can be scored at right angles to its longitudinal direction in the area of the interruption when the element which can pivot is in the cutting position.  
           [0014]    When the fiber is being scored, a sharp-edged element of the scoring device is moved on a scoring plane which runs parallel to the longitudinal axis of the fiber to be cut. The apparatus according to an embodiment of the invention is furthermore distinguished in that the rotation shaft is arranged in the contact element such that a fiber which is held by the holding apparatus is touched by the contact element exclusively in the cutting position when the element which can pivot is being pivoted from the insertion position to the cutting position. When the element which can pivot is located in the insertion position, the holding apparatus is at a distance from the other components of the apparatus, such that the holding apparatus is freely accessible from one side for convenient and protective insertion of a fiber to be cut.  
           [0015]    A first clamping apparatus and a second clamping apparatus are fitted to the contact element and/or to the element which can pivot, with the first clamping apparatus fixing each fiber which is held by the holding apparatus, on a first side of the interruption and the second clamping apparatus fixing each fiber which is held by the holding apparatus, on the second side of the interruption. This ensures that the fiber to be cut is held in a defined manner, in a simple and advantageous way.  
           [0016]    The contact element has a curved surface along the longitudinal direction of the fiber so that a fiber that needs to be cut is prestressed with a defined curvature if the element which can pivot is in the cutting position. Prestressing the fiber to be cut has the advantage that the resultant broken surface quality of the fiber ends is considerably improved.  
           [0017]    The contact element is designed asymmetrically relative to the interruption and along the longitudinal direction of the fiber such that a subsection of the fiber which is to be cut, has no sheath and is located on the first side of the interruption is held essentially without any contact while the element which can pivot is in the cutting position, and touches the contact element only in the at least immediate vicinity of the interruption. This has the advantage that the part of the optical fiber to be cut and which is used for a subsequent splicing process or for optical coupling to an optical connector or to an optical coupling, is touched by the contact element only in the immediate vicinity of the cutting point. This results in deformed points being produced only in the immediate vicinity of the cutting point, and these have scarcely any influence on the tensile strength of the fiber since these deformed points are largely healed thermally during a subsequent splicing process.  
           [0018]    The contact element has a plastic insert. This is arranged such that that subsection of the fiber to be cut which has no sheath is touched exclusively by the plastic insert and not by the contact element. The use of a plastic insert such as this has the advantage that the mechanical damage in the vicinity of the cutting point is considerably reduced, so that the resultant tensile strength of a spliced fiber is considerably increased.  
           [0019]    The contact element has an anvil and a base element. This configuration in at least two parts has the advantage that only the relatively small anvil need be manufactured with high precision from a high-quality material, rather than the entire base element, in order that the fiber to be cut can be placed on the anvil during the scoring process such that it is protected as well as possible and is in a precisely defined physical position.  
           [0020]    One particularly preferred development of an embodiment of the invention is distinguished in that the contact element has contact points which are at different distances from the scoring plane, and in that the rotation shaft of the element which can pivot can be moved. The fiber to be cut rests on the contact point which is associated with the respective position, as a function of the respective position of the rotation shaft, when the element which can pivot is in the cutting position. This has the advantage that fibers of different thickness can be cut using one and the same cutting apparatus.  
           [0021]    According to an embodiment, the vertical distance between the center axis of the fiber to be cut and the scoring plane remains unchanged when the rotation shaft is moved. This has the advantage that the vertical position of the fiber core relative to the scoring device remains unchanged for fiber sheaths of different thickness, provided that the rotation shaft of the element which can pivot is moved to a position which is associated in a corresponding manner with the thickness of the fiber sheath. With the diameter of the fiber core remaining unchanged, it is thus possible to cut fibers with sheaths of different thickness without having to be concerned about the overall diameter of the fiber, with a constant accuracy and without any special adjustment of the scoring device.  
           [0022]    According to another development, the rotation shaft can be moved between at least two discrete positions such that, particularly when using an eccentric lever, the cutting apparatus can be switched in a simple manner to allow fibers of different thickness to be cut.  
           [0023]    An object relating to a method on which an embodiment of the invention is based is achieved by a method for cutting at least one optical fiber. In the method according to an embodiment of the invention, an element which can pivot is first of all moved to an insertion position, before the fiber to be cut is passed to a holding apparatus which is fitted to or formed on the element which can pivot, by which the fiber is held in a defined position relative to the element which can pivot, over the entire profile of a pivoting movement. After this, the element which can pivot is pivoted from the insertion position to a cutting position, with the fiber being held essentially parallel to the rotation axis of the pivoting movement, and the fiber being touched by a contact element exclusively in the cutting position. After pivoting to the cutting position, the fiber is scored at a predetermined cutting point by way of a scoring device which is fitted to the contact element, so that the fiber to be cut is cut into two parts. The scoring movement is in this case at right angles to the longitudinal, direction of the fiber, in a scoring plane which is arranged parallel to the longitudinal direction of the fiber. The element which can pivot is then pivoted from the cutting position to a removal position, and the fiber is removed from the holding apparatus.  
           [0024]    In another embodiment, before the fiber to be cut is scored, the fiber is additionally fixed by way of a first clamping apparatus and a second clamping apparatus on the element which can pivot. After the element which can pivot has pivoted from the cutting position to the removal position, fixing of the fiber by the first clamping apparatus and the second clamping apparatus is released, with the first clamping apparatus fixing the fiber of a first side of the predetermined cutting point, and the second clamping apparatus fixing the fiber on the second side of the predetermined cutting point. This has the advantage that it prevents any movement, caused by the movement of the scoring blade, of the optical fiber to be cut, during the scoring process, thus satisfying an important precondition for the fiber end surfaces to have a uniform high quality.  
           [0025]    According to one particularly preferred development of an embodiment of the invention, the cutting apparatus is matched to different fiber diameters in that, before the element which can pivot is pivoted from the insertion position to the cutting position, the rotation shaft is moved such that the fiber to be cut touches the contact element at a contact point which is associated with the respective position of the rotation shaft, after the element which can pivot has been pivoted to the cutting position, with the distance between the scoring device and the respective contact point depending on the position of the contact element. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0026]    Further advantages, features and details of the invention will become evident from the description of illustrated embodiments given hereinbelow and the accompanying drawings, which are given by way of illustration only and thus are not limitative of the present invention, wherein:  
         [0027]    [0027]FIG. 1 a  shows a schematic cross-sectional view at rights angles to the axis of the fiber to be cut of a cutting apparatus according to a first exemplary embodiment of the invention. The element which can pivot is in the insertion position.  
         [0028]    [0028]FIG. 1 b  shows the cutting apparatus as illustrated in FIG. 1 a . The element which can pivot is in the cutting position.  
         [0029]    [0029]FIG. 2 shows a schematic cross-sectional view parallel to the axis of the fiber to be cut of the asymmetric shape of a contact element according to one development of an embodiment of the invention.  
         [0030]    [0030]FIG. 3 shows a perspective overall view of the cutting apparatus according to the first exemplary embodiment of the invention.  
         [0031]    [0031]FIG. 4 a  shows a schematic cross-sectional view at right angles to the axis of the fiber to be cut of a cutting apparatus according to a second exemplary embodiment of the invention. The rotation shaft has been moved to the left by way of an eccentric shaft.  
         [0032]    [0032]FIG. 4 b  shows the cutting apparatus as illustrated in FIG. 4 a . The rotation shaft has been moved to the right by way of the eccentric shaft.  
         [0033]    [0033]FIG. 5 shows a perspective overall view of the cutting apparatus according to the second exemplary embodiment of the invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0034]    [0034]FIGS. 1 a  and  1   b  show schematic cross-sectional views at right angles to the axis of the optical fiber to be cut of a cutting apparatus  100  according to a first exemplary embodiment of the invention. Where the same reference symbols are used in the following text and in FIGS. 1 a  and  1   b , then they always relate to the same components of the cutting apparatus  100 .  
         [0035]    The cutting apparatus  100  has a so-called contact element which in turn, on the basis of the exemplary embodiment described here, has a base plate  101  and an anvil  102 . As will be explained in more detail in the following text, it is worthwhile splitting the contact element into the base plate  101  and the anvil  102  because an optical fiber  105  to be cut makes contact only with the anvil  102  in the course of the cutting process. In consequence, only the anvil  102  need satisfy the stringent requirements for a precise shape and surface characteristic, which are necessary in order to prevent unnecessary damage to the optical fiber  105  to be cut. An element  103  which can pivot is mounted on a rotation shaft  106 , such that it can pivot, on the base plate  101 , with the rotation shaft  106  being arranged in a fixed position relative to the base plate  101 .  
         [0036]    The element  103  which can pivot has a cutout in which a fiber holder  104  is accommodated. A groove  108  with a triangular cross section is formed on the fiber holder  104 , and is suitable for accommodating the optical fiber  105  to be cut. At this point, it should be mentioned that the groove  108  may, of course, have a likewise differently shaped cross-sectional area, or may have any desired different cross-sectional areas along its longitudinal direction. The cutting apparatus  100  also has a scoring device, which is attached to the base plate  101 . Only a so-called scoring blade  107  of the scoring device is illustrated in FIGS. 1 a  and  1   b , whose lower edge is designed such that the cylindrical surface of the fiber  105  to be cut can be scored. The element  103  which can pivot is mounted such that it can pivot in such a way that it can be pivoted between a so-called insertion position (see FIG. 1 a ) and a cutting position (see FIG. 1 b ).  
         [0037]    The method of operation of the cutting apparatus  100  will be described in more detail in the following text. In order to cut an optical fiber according to the exemplary embodiment of the invention as described here, the element  103  which can pivot is first of all pivoted to the insertion position (see FIG. 1 a ). The optical fiber  105  to be cut is then inserted into the groove  108  that is formed on the fiber holder  104 , and is fixed in the groove  108  by means of two clamping apparatuses (not illustrated).  
         [0038]    The element  103  which can pivot is then pivoted from the insertion position to the cutting position (see FIG. 1 b ), with the optical fiber  105  to be cut being held essentially parallel to the rotation axis  106  of the pivoting movement throughout the entire pivoting movement, and the optical fiber  105  to be cut being touched by the anvil  102  exclusively in the cutting position. The optical fiber  105  to be cut is then scored at right angles to the longitudinal direction of the fiber  105 , at a predetermined cutting point, by means of the cutting blade  107 . Depending on the intensity of the scoring process and on any prestressing of the optical fiber  105  to be cut, caused, for example, by the anvil  102  having a curved surface, the fiber  105  is actually broken at this time or must be broken at a later time by deliberately bending the fiber  105 .  
         [0039]    After the fiber  105  has been scored, the element  103  which can pivot is pivoted from the cutting position (FIG. 1 a ) to a removal position which, on the basis of the exemplary embodiment of the invention as illustrated here, is identical to the insertion position. Once the element  103  which can pivot has been pivoted to the removal position, the fixing of the fiber  105 , produced by the two clamping apparatuses (not illustrated), is released. Depending on the intensity of the scoring process and the intensity of the previously applied bending of the glass fiber  105  to be cut, an optical fiber  105  which has not yet been broken can now be removed from the groove  108 , or two parts of the already broken fiber  105  can be removed from the groove  108 .  
         [0040]    [0040]FIG. 2 shows a schematic cross-sectional view parallel to the optical fiber  205  to be cut, illustrating how the optical fiber  205  is passed over the anvil  202 , when the element  103  which can pivot is in the cutting position. The anvil  202  has an asymmetrically shaped surface along the longitudinal direction of the fiber  205 , with the asymmetry being produced by an incision  211  which, as is illustrated in FIG. 2, is located to the left of the cutting point  213 . A plastic insert  214  is also provided to the left of the cutting point and is preferably produced from a soft material in order to minimize the mechanical damage caused by contact with the fiber core to be cut. This results in an increase in the tensile strength of a spliced fiber, in which two planar fiber ends are spliced to one another, with these planar fiber ends having been produced previously by means of the cutting apparatus  100 , which has the plastic insert  214 .  
         [0041]    Immediately underneath the cutting point  213 , the anvil  202  has a notch  212  which ensures that the side of the optical fiber  205  to be cut which is opposite the scoring blade  107  is not damaged by operation of the scoring blade  105 . After being cut, the fiber  205  has two sections  205   a ,  205   b , with only the section  205   b  still being used for further processing, for example for splicing to another optical fiber. The section  205   a  is generally no longer used for further processing of the fiber. For this reason, the following text refers to the section  205   a  as the waste section, and the section  205   b  as the good section. Before the cutting of the optical fiber  205 , the fiber  205  to be cut is fixed by means of two clamping apparatuses, although this is not shown in FIG. 2 b , with one clamping apparatus fixing the good section  205   b  of the fiber  205  to be cut, and a further clamping apparatus fixing the waste section  205   a  of the fiber.  
         [0042]    The clamping apparatus which fixes the good section  205   b  is, according to the exemplary embodiments of the invention as described here, designed such that a sheath (not illustrated) of the optical fiber is fixed rather than the core of the optical fiber  205 , with this sheath providing protection against damage for the good section  205   b  of the optical fiber  205  to be cut. The clamping apparatus which fixes the waste section  205   a  of the optical fiber  205  is designed, according to the exemplary embodiment described here, such that the core of the optical fiber  205  is fixed produced by an incision  211  which, as is illustrated in FIG. 2, is located to the left of the cutting point  213 . A plastic insert  214  is also provided to the left of the cutting point and is preferably produced from a soft material in order to minimize the mechanical damage caused by contact with the fiber core to be cut. This results in an increase in the tensile strength of a spliced fiber, in which two planar fiber ends are spliced to one another, with these planar fiber ends having been produced previously by means of the cutting apparatus  100 , which has the plastic insert  214 .  
         [0043]    Immediately underneath the cutting point  213 , the anvil  202  has a notch  212  which ensures that the side of the optical fiber  205  to be cut which is opposite the scoring blade  107  is not damaged by operation of the scoring blade  105 . After being cut, the fiber  205  has two sections  205   a ,  205   b , with only the section  205   b  still being used for further processing, for example for splicing to another optical fiber. The section  205   a  is generally no longer used for further processing of the fiber. For this reason, the following text refers to the section  205   a  as the waste section, and the section  205   b  as the good section. Before the cutting of the optical fiber  205 , the fiber  205  to be cut is fixed by means of two clamping apparatuses, although this is not shown in FIG. 2 b , with one clamping apparatus fixing the good section  205   b  of the fiber  205  to be cut, and a further clamping apparatus fixing the waste section  205   a  of the fiber.  
         [0044]    The clamping apparatus which fixes the good section  205   b  is, according to the exemplary embodiments of the invention as described here, designed such that a sheath (not illustrated) of the optical fiber is fixed rather than the core of the optical fiber  205 , irrelevant for further use, in particular for the tensile strength of the fiber  205 , since the good section  205   b  has a fiber sheath at the point at which the clamping apparatuses fix the good section  205   b , according to the exemplary embodiment of the invention described here. The point on the good section  205   b  which touches the anvil  202  in the immediate vicinity of the cutting point  213  is likewise irrelevant, owing to the thermal healing, as already described above, of any fiber damage.  
         [0045]    [0045]FIG. 3 shows an overall perspective illustration of a cutter  300  according to a first exemplary embodiment of the invention. The cutter  300  has a base plate  301 . An anvil  302  is located in a cutout that is formed on the base plate  301 . An element  303  which can pivot is mounted in a rotation shaft (not illustrated) on the base plate  301  such that the element  303  which can pivot can pivot between an insertion position, which is illustrated in FIG. 3, and a cutting position. The cutter  300  also has a scoring blade  307 , which can be operated by the control lever  321 .  
         [0046]    A groove  308  is formed as a holding apparatus on the element  303  which can pivot, and has an interruption at least in the area of the anvil  302 . The optical fiber to be cut (not illustrated) is inserted into the groove  308  in accordance with the exemplary embodiment of the invention described here, and is secured by way of a locking lever  324 , which presses the optical fiber to be cut against the contact projection  323  such that the good section  205   b  of the optical fiber to be cut is held firmly on the element  303  which can pivot.  
         [0047]    Once the element  303  which can pivot has been pivoted to the cutting position, the control lever  321  can be operated. The control lever  321 , according to the exemplary embodiment of the invention described here, not only operates the scoring blade  307  but also presses the clamping jaws  320  against the optical fiber to be cut such that it is fixed, particularly in the area of the anvil  302 .  
         [0048]    According to the first exemplary embodiment of the invention, the left-hand clamping jaw  320  illustrated in FIG. 3 presses on the good section  205   b  of the fiber, which has a fiber sheath, except in a small area in the vicinity of the cutting point. The right-hand clamping jaw  320  illustrated in FIG. 3 presses on the waste section  205   a  of the optical fiber (not illustrated) to be cut, which does not have a fiber sheath. The cutter  300  also has a waste container  322 , in which the waste sections  205   a  from a large number of cutting processes that have been carried out can be collected. This has the advantage that the waste sections  205   a  are reliably collected, thus reducing any risk of skin injuries caused by waste sections  205   a  flying around.  
         [0049]    [0049]FIGS. 4 a  and  4   b  show a schematic cross-sectional view, at right angles to the axis of the optical fiber to be cut, of a cutting apparatus  400  according to a second exemplary embodiment of the invention. Where the same reference symbols are used in the following text and in FIGS. 4 a  and  4   b , then these always relate to the same components of the cutting apparatus  400 . The cutting apparatus  400  has an element  401  which can pivot and is fitted to a base plate, which is not illustrated, and can pivot about an eccentric shaft  402 . The optical fiber  405  to be cut is pivoted from the insertion position to a cutting position by way of the element  401  which can pivot.  
         [0050]    Depending on the position of the eccentric shaft  402 , the rotation shaft  403  of the element which can pivot is moved through a distance e to the left (FIG. 4 a ) or through a distance e to the right (FIG. 4 b ) relative to a null position  406  of the rotation shaft  403 . When the rotation shaft  403  is moved to the left, this is also associated with a very small movement of the rotation shaft  403  upward, although this is not illustrated in FIG. 4 a . Furthermore, the movement of the rotation shaft  403  to the right is associated with a very small movement of the rotation shaft  403  downward, although this is not illustrated in FIG. 4 b . As is illustrated in FIGS. 4 a  and  4   b , the contact point of the fiber to be cut on the contact element  420  also changes when the rotation shaft  403  is moved, with the contact element  420  having a first contact surface  422  and a second contact surface  423 . The two contact surfaces are separated from one another by means of a step which has an edge  421 , so that the second contact surface  433  is located at a lower level than the first contact surface  422 .  
         [0051]    As can be seen from FIG. 4 a , the contact point of the fiber  405  to be cut is at a distance e′ to the right of the edge  421  when the rotation shaft  403  is moved to the left. As can be seen from FIG. 4 b , the contact point of the fiber  405  to be cut is at a distance e′ to the left of the edge  421  when the rotation shaft  403  is moved to the right.  
         [0052]    The scoring device has a scoring blade  407  with a sharp lower edge which is moved along the movement direction indicated by the arrow  418  on the surface of the fiber  405  in order to score the fiber  405  to be cut. The eccentric shaft  402  can be positioned suitably in order to ensure that the contact point of the fiber to be cut is at a distance from the scoring plane which is matched to the respective diameter of the fiber to be cut. The center axes of fibers to be cut which have different thicknesses preferably lie on a plane which runs parallel to the scoring plane. The cutting apparatus  400  can thus be switched by simple movement of the rotation shaft  403  to make it possible to cut optical fibers with different fiber diameters without any further adjustment of the cutting apparatus  400 .  
         [0053]    It should be mentioned that the invention is in no way restricted to a cutting apparatus  400  which is suitable for only two different fiber diameters. For example, by using two or more eccentric shafts or by using any desired number of other apparatuses for movement of the rotation shaft of the element which can pivot in conjunction with a contact element having two or more steps or having an obliquely running surface, it is possible to produce a cutting apparatus which is suitable for a large number of different fiber diameters.  
         [0054]    [0054]FIG. 5 shows an overall perspective illustration of a cutter  500  according to a second exemplary embodiment of the invention. The cutter  500  has a base plate  501  on which an eccentric shaft (not illustrated) and an eccentric lever  525  are arranged. The eccentric shaft can be moved eccentrically by way of the eccentric lever  525  such that, as explained above, the cutting apparatus can be matched to different fiber diameters. The cutting point on the optical fiber  505  to be cut rests on a two-step anvil  502  when the element which can pivot is located, as illustrated in FIG. 5, in the cutting position.  
         [0055]    The cutter  500  furthermore has a scoring blade  507  which can be operated by the control lever  521 . A groove  508 , in which the optical fiber  505  to be cut is inserted, is formed as a holding apparatus on the element  503  which can pivot. The fiber  505  to be cut is fixed by way of two clamping jaws  520  on the anvil  502  before the actual cutting process, such that the position of the fiber  505  is not changed while the fiber is being scored by the scoring blade  507 .  
         [0056]    Like the cutter  300  which has been described with reference to FIG. 3, the cutter  500  has a waste container  522  in which the cut-off fiber pieces can be collected.  
         [0057]    In summary, the various embodiments of the invention provide an apparatus and a method for cutting at least one optical fiber, with the use of an element  103  which can pivot and an anvil  202  which is shaped asymmetrically resulting in the good section  205   b  of the fiber  205  to be cut being touched at only two points which are essentially not significant to the tensile strength of a spliced fiber which includes the good section  205   b . At one of these points, the glass fiber core of the good section  205   b  of the fiber  205  is protected against damage by a fiber sheath. At the other point, which is located in the immediate vicinity of the cutting point, any mechanical damage is of only secondary importance, since this point is heated during the splicing of the good section  205 , such that any mechanical damage to the glass fiber core is at least partially healed by heating of the fiber end of the good section  205   b.    
         [0058]    Furthermore, according to one exemplary embodiment of the invention, the damage at the other point is considerably reduced by the use of a plastic insert, thus considerably increasing the resultant tensile strength of a spliced fiber. According to a second exemplary embodiment of the invention, the rotation shaft  403  of the element  401  which can pivot is moved such that the fiber  405  touches the contact element  420  at a contact point  422 ,  423 , which is associated with the respective position of the rotation shaft  403 , after the pivoting of the element  401  which can pivot to the cutting position, with the vertical distance between the scoring plane and the respective contact point  422 ,  423  depending on the position of the rotation shaft  403 . The cutting apparatus  400  can thus be used for fibers of different thickness.  
         [0059]    Exemplary embodiments being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.