DE4235313A1 - Measurement of several optical waveguides e.g. at multi-fibre connection - sequentially moving light spot over coupling sections and evaluating time distribution of light transmitted through waveguides - Google Patents

Abstract

A light spot on the transmission end is moved sequentially over the input coupling sections (TC1-TCn) of the optical waveguides (LW1-LWn) to be measured and coupled into them. The corresp. reception fields of the measurement optical waveguides are detected according to their mutual time displacements. The time distribution of the received light fields is prepared for evaluation. The positions of the optical waveguides are determined from the time distribution of the received light fields and can be used to control the light spot (SF) at the transmission end. USE/ADVANTAGE - For measurements on several optical waveguides, e.g. in ribbon cable. Improved coupling ratio for measurement.

Description

The invention relates to a method for measurements several optical fibers, light emitting in the optical fibers to be measured are coupled in is and with a part of this at the receiving end Light is decoupled and evaluated.

From EP 0411 956 A2 is a measuring device for assessment division of a multi-fiber junction known. they has an optical switch, the switching paths or Transmission channels each arranged with equidistant Measuring optical fibers are spliced firmly on the end face. On the transmission side, a measurement signal is generated from an optical one Transmitter sequentially in the switching paths of the opti the switch and fed in with a Receiving element of an optical receiver added and evaluated separately. The fact that the optical transmitter with the optical switch and the measuring fiber with the switching paths or transmission channels of the optical Switch are firmly connected, is the effort for the On or decoupling of the measuring optical waveguide high. The got te measuring device is on the fixed coupling of the opti rule transmitter to the equidistantly arranged measuring light lenleiter turned off and limited. With fluctuating or varying coupling ratios, as z. B. in optical Transmission lines with fiber optic ribbon through not equidistantly arranged optical fibers, by un Different color orders or by different Be Coatings of the optical fibers occur can, the known measuring device is hardly usable.

The invention has for its object to find a way show how the coupling ratios for measurements on several Ren optical fibers in a simple way who improved that can.

According to the invention, this object is achieved in a method of the type mentioned solved in that transmission side a transmit radiation field with its light spot above one coupling sections of the optical fibers to be measured moved in succession and coupled into it is that the receiving side of the transmission-side coupling assigned reception radiation fields of the to be measured Optical fibers in their temporal distribution other, and that this temporal distribution is provided for evaluation.

Rigid compared to that used in the prior art Coupling of the transmission side to the optical waveguide by means of The invention offers switches various possibilities additional information, for example about the location or to win the state of the optical fibers. About that in addition, the path taken in the invention is the Coupling by means of a transmission radiation field in the Practice much easier and faster to implement than the coupling by means of fixed optical lines and additionally inserted optical switch. Through a too order between the transmit radiation field on one Side and the receiving radiation fields on the other Leave page with regard to their temporal distribution detailed information, for example about the Zu stood, the location, the damping behavior, etc. of the individual win an optical fiber and they can therefore be used for various use cases for further evaluation be provided.  

According to an expedient development of the invention from the temporal distribution of the received radiation field which determines the local position of the optical fibers and provided for evaluation. The location of the light waveguide plays a special role in various respects their role. For example, it may be important to locate the position of the optical fibers within a light knowing waveguide ribbon because of this information is otherwise very difficult to win elsewhere.

According to an expedient development of the invention by means of the temporal distribution of the received radiation on the transmitter side, the light spot of the transmitted radiation field of controlled. This allows a kind of "feedback" between The transmitting and receiving side are produced so that to measure the respective received radiation field for everyone the optical fiber can be influenced individually. In this way, the received radiation fields are independent dependent on the transmitting and / or receiving coupling server conditions can be specified and can also be controlled within certain limits is compliant. This is particularly important, for example Measurements on several optical fibers are important differ in their coupling properties the. This can be caused, for example, by different reasons Color orders (for example red, green, blue), from each other different color thicknesses, different loading Layering (coatings) or alternatively from each other different fiber geometries (e.g. core eccentricities). Due to the temporal resolution of the received radiation field which during the movement of the light spot over the Einkop pel sections of the optical fibers to be measured the coupling ratios far at the transmitting and / or receiving end going regardless of fiber optic positions, esp especially from their core locations. The broadcast The radiation field does not need to be specific  spatial allocation to the light world to be measured stand ladders. This advantage is particularly with Measurements on optical fiber ribbon (or optical Ribbon cables) of importance. From the measured time Chen distribution of the received radiation fields is the temporal sequence of those time intervals determined, too which light in the optical fiber to be measured during the transmission-side movement of the light spot is guided. Mark the time intervals from this reference measurement each approximate the location of the light waves carrying light head core. For example, for subsequent actual measurements on the optical fibers the Sen de radiation field according to the recorded sequence of light-guiding time intervals or coupling time intervals are switched on (keyed). The light So spot only illuminates during this specific one Coupling-in time intervals send the coupling-in from cuts the optical fiber to be measured while it is in the other times of his movement can. The transmission-side coupling of the transmission radiation The field with its light spot becomes a kind of pulse operation carried out. This results in many Possibilities for a better use of the light emitted by the transmitter. For example, the Transmitter itself better used by pulse operation and thus the transmitted radiation field with higher light output fed into the respective optical fibers to be measured become. Less light energy is thus uselessly lost ren. Under certain circumstances, that for the actual Measurement required average light output in transmission side be reduced to a certain extent, so that in particular Using a laser as a transmitter element problems of Au gene security can be mitigated if necessary.  

According to an advantageous development of the invention the determined location of the optical fibers Darge provides and / or recorded. Such an application The application of the invention is particularly from Inter eat, for example, as part of a manufacturing facility device for fiber optic tapes whose location within the common coating is continuously checked and checked if necessary, to be registered. Especially in the Hin view of the necessary splicing processes are given to the ge exact position of the optical fibers within the ribbon high demands, because only with one largely consistent positioning of the optical fibers too the splicing process is accordingly simplified and more precise can be carried out. The one from the temporal distribution development of the received radiation fields according to the invention won simple statement about the spatial position of the Optical fiber or fiber optic cores allows here is a simple implementation of the measures for qualification assault. In this context it is also from be special interest that the statement of the invention in he line also a statement about the location of the light world lenleiter cores supplies, it should be noted that by other means determining the location of the Fiber optic cores very difficult and relatively um can be carried out on a regular basis. According to the Erfin the specific received radiation field of the individual Optical fiber is also exactly where later on Example in a splicing process that approximately coexists the cores of the optical waveguides to be arranged so that the invention also enables a direct statement to be made, where the geometrically best light guide in the light waveguide ter is done.

According to a further expedient embodiment of the Er is determined from the temporal distribution of the reception  Radiation fields each determine their light output and provided for evaluation. The additional won in this way che information leaves assessments in particular in the look at, for example, different transmission dampers of the individual optical fibers, any under different positions and assignments, as well as Example also about the quality of splice connections to.

By means of this light picked up selectively at the receiving end benefits can be according to an advantageous training of the invention, the light spot of the transmission beam on the transmission side be controlled. This makes it possible for everyone For example, a specific optical fiber to be measured Adjust the transmission power individually so that the a certain power level or a can achieve predetermined light output. Can be beneficial in particular the transmission side can be set so that the received beam received at the receiving end overall, their light output is only marginal gig differentiate from each other. That way ever because the signal-to-noise ratio is individual for those improved some of the optical fibers to be measured, at which originally the intensity of the received radiation fields was low or very low. Can also on this Override of the receiving-side evaluations device avoided in those optical fibers that deliver very high received radiation fields. By setting the reception level to be approximately the same also falls an otherwise necessary, elaborate shawl device amplifier stages in the receiver.

According to another expedient further training of the Er light outputs of the individual optical fiber shown and / or up  be drawn. This is especially true for such an use cases of interest, such as the quality of a already performed splice connection can be assessed should. The individual light outputs measured for the operator, for example, on a display device tion (display) are shown, enable un indirect assessment of the quality of the splice connection. No A continuous display can also be used Complete registration of the measured amplitude values leads.

The invention also relates to a device for measurement conditions on several optical fibers with an optical Sending / coupling device to measure each the optical fiber can be coupled, as well as with a optical receiver, the at least one receiving element to which an evaluation device is assigned, which is characterized in that the transmission / coupling device is designed such that each transmission side because a transmission radiation field with its light spot via coupling sections of the light waves to be measured ladder can be moved one after the other in time can be coupled, and that in the optical receiver the Emp catch element is aligned and designed so that this is assigned to the transmission coupling Received radiation fields of the light to be measured waveguide recorded in their temporal distribution, it generates received signals and an evaluator feed device.

The invention also relates to a method for coupling of light into multiple optical fibers to be measured where in which the light is measured one after the other in time Optical fiber is coupled, which ge indicates that a transmission radiation field is such  is spatially depicted that a light spot with a larger spatial extent perpendicular to the spread direction of the transmitted radiation field than in its Scanning direction is generated, and that by means of this light flecks coupling sections of the to measuring optical fibers are illuminated.

Because the spatial extent of the transmitted radiation field at the coupling location and thus lower its light spot right to the direction of propagation of the transmitted radiation field is larger than in the scanning direction of the light spot, d. H. the light spot extends perpendicular to the propagation direction of the transmitted radiation field is uneven largely ensured that the cores of light waves Head even with different core layers fully illuminated or detected. A individual, exact guidance and alignment of the light fle ckes LF on the respective fiber optic core, as they for example with a very small point light spot on the order of an optical fiber core (approx. 10 µm) is therefore not necessary. Rather, light can be independent of the respective core Position in the core of the respective optical fiber with sufficiently high light output can be coupled. Un Different core locations, e.g. B. due to tolerances or fluctuations in fiber geometries and difference to measure thick coatings the optical fiber can not egg in this way impairment of light coupling with the light lead stain. By the preferred direction of the light spot perpendicular to the direction of propagation of the transmitted radiation field the cores of the optical fibers are migrating Light spot reliably hit or scanned and with optimal light output selective or individual optimally illuminated, so that the light with high efficiency  degrees, that means high light output, injected into the cores can be pelt. In particular, this illustration of the Light spot of importance with fiber optic ribbon, since there the optical fiber z. B. different through have knives or of a different thickness outside envelope AH1 can be surrounded so that the Lichtwellenlei occupy different spatial positions in it.

In particular, the light spot points to reliable light coupling an approximately slim oval, elliptical or strip-like geometry or cross-sectional shape in one Coupling plane perpendicular to the direction of propagation of the Transmitting radiation field and perpendicular to the scanning direction of the light spot.

The invention also relates to a device for Einkop piling light into several optical fibers to be measured with an optical transmission / coupling device that to the each optical fiber to be measured can be coupled, which is characterized in that in the transmission / cop peleinrichtung Means for imaging a transmit beam are provided in such a way that the one of them witnessed light spot lower a larger spatial extent right to the direction of propagation of the transmitted radiation field of the as in its scanning direction and temporally successively coupling sections of the light to be measured illuminated waveguide.

Other developments of the invention are in the sub claims reproduced.

The invention and its developments are as follows explained in more detail with reference to drawings.  

It shows

Fig. 1 in a partially perspective view showing the schematic overall structure of a measuring device for carrying out the procedural invention Rens,

Fig. 2 shows an embodiment for the transmission side on a construction of the measuring device of FIG. 1 in detail,

Fig. 3 shows a schematic representation of a first transmit level for a transmitting-side coupling of Fig. 1,

Fig. 4 shows a corresponding receiving level to the transmission level of Fig. 3,

Fig. 5 shows a second transmission level for the transmission-end incoupling of FIG. 1,

Fig. 6 shows a third transmission level for the transmission-end incoupling of FIG. 1,

Fig. 7 shows a fourth transmission level for the transmission-end incoupling of FIG. 1,

Fig. 8 is a to the transmission levels of the Figs. 6 and 7 associated reception level.

Fig. 9 shows a schematic representation of a scan or scanning plane in the transmission coupling and

Fig. 10 in a schematic representation a coupling plane perpendicular to the drawing plane of Fig. 9 with the associated light spot.

Fig. 1 shows a measuring device ME according to the invention, the components of a transmission / coupling device SK with an optical transmitter OT1 together with the associated coupling device KV1 (see. Fig. 2), an associated Ansteuervorrich device ASV1, an optical receiver OR1 and an evaluation teeinrichtung AE1 has. These components can together with a dash-dotted framed multiple splicing device MS1 expediently to a Meßkof fer z. B. a fiber optic splicer or an attenuation meter. In addition to this particularly advantageous field of application, the invention can also be used for the selective determination of further optical transmission parameters such as, for. B. of phase delays, impulsive words, path attenuation, etc., and in a variety of other problems of multi-fiber technology such. B. for fiber optic identification, production control and production monitoring of fiber optic ribbons, for quality control, for determining fiber geometries and optical quality properties, etc. are used. For the following explanations, reference is made in each case to the transmission or splice loss measurement for optical fiber splicers.

In Fig. 1 are in the multiple splicer MS1 a first ribbon cable BL1 (optical fiber tapes Chen) with optical fibers LW1 to LWn and a second, to be welded ribbon cable BL2 with optical fibers LW1 * to LWn *. The optical fibers LW1 to LWn of the ribbon cable BL1 are almost parallel embedded in a flat, approximately rectangular in cross-section, outer envelope AH1 (made of plastic material), which is indicated in the left part of FIG. 1 and in the remaining figures part has been omitted for the sake of clarity . Correspondingly, the optical fibers LW1 * to LWn * of the ribbon cable BL2 are surrounded by a similarly designed outer sheath AH2, which is indicated in the right part of FIG. 1 and then omitted. An at least partially optically transparent material is expediently chosen for the outer envelopes AH1 and AH2 in order to ensure that light is coupled in and / or out largely without loss.

In order to couple light into the optical waveguide LW1 to LWn to be measured on the transmission side, the transmission / coupling device SK is coupled to an arbitrarily predeterminable section of the strip line BL1 in the left part of FIG. 1. For light coupling, the optical waveguides LW1 to LWn, as can be seen from FIG. 2, are guided in the coupling device KV1 in an approximately arcuate or curved manner. For this purpose, an approximately cylindrical bending mandrel ZT1 of a bending coupler BK1 is provided in the present exemplary embodiment. The bending coupler BK1 has a guide groove FN1 on the circumference of its cylinder ZT1 for lateral securing of position or for guiding the ribbon cable BL1, the width of which corresponds approximately to the width of the ribbon cable inserted therein or the fiber optic ribbon BL1.

The optical transmitter OT1 has at least one transmission element TE, for example a laser diode or a laser, which, in the exemplary embodiment shown, has an almost parallel light beam or a parallel beam LB in the direction of a rotatable or pivotable mirror BS provided as a deflection device with a transmission power TP emits. For the sake of clarity, only three light beams LS1 to LSk of the light bundle LB are shown in FIG. 2.

The light bundle LB strikes in the optical transmitter OT1 on the rotatable mirror BS which is transverse to the main radiation direction or tilted. From its mirrored surface VO, the light beams LS1 to LSk are re fl ected and almost parallel to one another on a coupling optics EO, in particular a lens system, between the optical transmitter OT1 and the coupling device KV1. The coupling-in optics EO bundles, that is focused, the light beams LS1 to LSk to form a transmission radiation field SF, the light spot LF of which is imaged in a coupling area or curvature area KB1 of the bending coupler BK1. The coupling area KB1, in which the optical waveguides LW1 to LWn are curved, is indicated by dash-dotted lines in FIG. 2.

A coupling level is defined in this coupling area KB1 with a y, z coordinate system. The coupling plane spanned by the y and z axes is approximately perpendicular to the drawing plane and thus perpendicular to the direction of propagation x of the respective transmitted radiation field SF. The y-axis identifies a scanning direction for the light spot or light spot LF transverse to the longitudinal direction (axial extent) of the ribbon cable BL1. The light spot LF in the coupling plane y, z preferably has an almost strip-shaped or line-shaped or slim oval shape (cf. FIGS. 9 and 10). To generate the light spot LF, mirrors or suitable diaphragms (for example a slit diaphragm) can advantageously be provided as imaging means for the transmitted radiation field SF in the beam path of the light bundle LB. This allows tolerances in the position of the optical waveguides to be compensated in a reliable manner, preferably in the z direction, as can be caused, for example, by a varying ribbon thickness or differences in the optical waveguide diameters. For this purpose, a spatial extension is selected for the light spot LF in the z-direction at the coupling-in location or in the coupling-in plane, which is advantageously at least half the thickness of the optical waveguide ribbon BL1, in particular between 100 μm and 200 μm. It is generally sufficient for the light spot LF to extend in the z direction at the coupling location in the order of magnitude of the thickness of the optical waveguide or the thickness of the optical waveguide ribbon BL1. The illumination field width of the light spot LF in the scanning direction y is preferably selected smaller at the coupling location than the optical fiber outer diameter (in particular, for example, below about 250 μm), so that light can be coupled into the respective optical fiber core with high light output. The beam width of the light spot LF in the y direction should expediently be selected at the coupling-in location at least equal to the core diameter of the respective optical waveguide, in particular if the transmission radiation field is already aligned with the respective optical waveguide core at the coupling-in location and the transmission radiation field at the respective Einkop pelort is established. In the case of a continuously migrating de radiation field over the respective coupling location, the beam width of the light spot LF in the y direction is advantageously also chosen to be smaller than the core diameter of the respective optical waveguide, so that the preferably linear light spot LF during the beam movement over the coupling location continuously sweeps and illuminates the core of the respective optical waveguide. In this way, radiation losses in the spaces between the core of the optical waveguide and the core of the optical waveguide can be largely avoided. The transmitted radiation field SF expediently has an approximately elongated illumination field at the coupling-in location in three dimensions, the spatial extent of which in the z direction is selected to be greater than in the scanning direction y. Further details on the spatial shape of the light spot LF are described in FIGS. 9 and 10.

Fig. 2 shows an inclined position of the rotatable mirror or deflecting mirror BS, in which the transmitted radiation field SF with its light spot or light spot LF, for example, illuminates a coupling section TC1 along the curved optical waveguide LW1 and is coupled into the core with almost tan potential . The respective coupling section z. B. TC1 and thus the actual coupling location in the core of the respective Lichtwellenlei age z. B. LW1 is expediently lenleiters z in the end region of the curvature of each arc-guided Lichtwel. B. LW1 illuminated at the transition to its rectilinear section, so that radiation losses or undesirable light coupling due to a further curved course of the optical fiber are largely avoided. The actual coupling-in location for the light coupling is advantageously approximately a curvature angle of 8 degrees deviating from that point along the curved optical waveguide z. B. LW1 assigned to which the optical waveguide lifts from the cylindrical mandrel ZT1 of the bending coupler BK1 and leaves it straight.

It expediently extends from Light spot LF hit coupling section z. B. TC1 to to a length of about 1 mm along the respective light waveguide z. B. LW1. The illuminated coupling section TC1 is drawn with an approximately oval, dash-dotted line neten frame indicated. In this coupling position Transmitting radiation field SF with its light spot LF only the optical waveguide LW1 in a clear manner Transmitted radiation field SF1 with a light spot LF1 individual duel assigned.

The inclined deflection mirror BS is now rotated or tilted in the beam path of the light beam LB by means of an actuating device BV about its pivot point DP, ie its angle to the light beams LS1 to LS3 is changed. The actuating device BV (cf. FIG. 1) is operated by a control device ASV1 by means of a control signal AS2 via a control line AL2. The actuation of the actuating device BV takes place playfully in such a way that the deflecting mirror BS, starting from its coupling position for the optical waveguide LW1, is rotated continuously or continuously at least into a coupling position BS * for the optical waveguide LWn, shown in dash-dotted lines. The rotational movement of the mirror BS around the pivot point DP in the beam path of the light beam LB is symbolically indicated by an arrow V. Due to the constant rotational movement of the mirror BS, the light beams LS1 to LS3 are deflected or swiveled and imaged by the coupling optics EO such that their associated transmission radiation field SF sweeps or illuminates the coupling or curvature area KB1 one after the other linearly in time. Also useful can be a rasterized, ie stepwise, rotation of the deflection mirror BS, so that the transmitted radiation field SF with its light spot LF scans the coupling area KB1 step by step, ie step by step. In the case of a step-by-step scanning with the light spot LF, the scanning steps are expediently chosen to be equal to or smaller than the distance between two adjacent light waveguide cores. The transmission radiation field SF moves translationally parallel to the plane in which the optical waveguides LW1 to LWn lie, ie it traverses or scans with its light spot LF one after the other the entire coupling area KB1 in the scanning direction y. The change in angle caused by the rotatable mirror BS is thus converted into a linear displacement of the light spot LF in the y direction. The transmit radiation field SF migrates with its light spot LF, for example in the case of the optical waveguide LW1, gradually or stepwise via the coupling region KB1 in the y direction to the optical waveguide LWn, that is to say clearly in FIG. 2: The transmit radiation field SF probes the rotational movement of the deflecting mirror BS transversely to the axial extent of the curved ge optical fibers LW1 to LWn from bottom to top via the coupling area KB1. The upper coupling position of the transmission radiation field SF is illustrated by means of dash-dotted lines of light rays LS1 * to LSk *, which are assigned to the twisted deflection mirror BS *. The associated transmission radiation field is designated SF and its light spot is designated LF. The transmit radiation field SF * is coupled with its light spot LF * as an individually assigned to the optical waveguide LWn transmit radiation field SFn with associated light spot LFn in its core approximately tangentially.

In order to be able to couple different measurement signals I1 to In (see FIG. 1) into the optical waveguides LW1 to LWn with the greatest possible intensity or light output, the light spot LF of the transmission radiation field of the SF becomes moving during the scanning direction y se sequentially preferably only coupled into one of the optical waveguide cores and not into several. Each optical waveguide LW1 to LWn is thus uniquely assigned a transmission radiation field SF1 to SFn, each with an individual light spot LF1 to LFn, which illuminates the curved optical waveguides LW1 to LWn along associated coupling sections TC1 to TCn.

The axis of rotation of the mirror 85 on the one hand and the Einkop pel range TC1 to TCn on the other hand are expediently each arranged approximately in the focal points of the Einkop peloptik EO in order to achieve a focused light coupling of high power.

Considered overall due to the selective one coupling through the swiveling movement of the transmitted radiation field SF on the transmission side a temporal resolution or selective activation of the individual light waves to be measured conductor LW1 to LWn reached. The actual spatial position of the optical fibers to be measured not matter.  

Instead of the rotatable deflecting mirror BS, a ro animal mirror can be used. Furthermore comes one Beam deflection system with a linearly movable mirror or a movement of the transmitting element itself, which requires an appropriately adapted coupling optics EO different. Likewise, instead of the beam deflector a beam blanking device, for example a translucent one fende slit, can be used. As drive elements suitable for the actuation of the beam deflection device z. B. Natural resonance scanner (torsion bar scanner, gate band scanners), galvanometer scanners, piezoelectric Scanners, etc. During self-resonance scanners a fixed fre have quenz, is with galvanometer scanners and piezo electrical scanners the frequency is variable. The drive elements continue to differ in the wave patterns, with which a scan is possible. Can be advantageous possible malfunctions of the mechanical beam deflection device tion also by using an acousto / electro-optical Deflection element can be avoided.

If necessary, the measurement signals I1 to In can also be fed directly into the cores via the open end faces of the optical waveguides LW1 to LWn, provided that these are accessible. The measurement signals I1 to In can advantageously in Fig. 1 from a dedicated transmitter, such as. B. originate from the transmission element TE, but also message signals from the optical fibers LW1 to LWn. In the optical transmitter OT1 can advantageously be provided for the selective, distinguishable coupling of the measurement signals I1 to In several transmitter elements, which are preferably summarized in the form of a line or an array (transmitter field). A selective measurement signal coupling can then advantageously be achieved by controlling these transmission elements by means of the control device ASV1 in multiplex mode. In this case, the following applies to the number of transmission elements in relation to the number of optical waveguides LW1 to LWn to be measured: the larger the number of transmission elements selected, the greater the temporal resolution that can be achieved, i.e. the greater the approximation to those there Continuous or steady light coupling from FIG. 2 described . For this purpose, at least as many transmitting elements are expediently provided as optical waveguides are to be measured. In general, about two to four times as many transmission elements are sufficient.

In Fig. 1, the coupled measurement signals I1 to In run in the optical fibers LW1 to LWn to be measured via the multiple splicing device MS1 to the receiving end. There is a portion of them in a second coupling device KV2 (constructed analogously to the coupling device KV1) by the optical receiver OR1 z. B. ausekop pelt by means of a second bending coupler BK2 in an approximately tangential direction. For this purpose, the optical waveguides LW1 * to LWn * of the second ribbon cable BL2 are curved in a guide groove FN2 around a cylinder ZT2 analogous to the transmission side. As a result, the transmitted radiation fields SF1 to SFn are assigned receive radiation fields RF1 to RFn, which are each individually assigned to the optical waveguides LW1 to LWn to be measured, from their cores along arcuate outcoupling sections RC1 to RCn into the coupling area KB2 of the bending coupler BK2 out. Since the shifting movement of the light spot LF causes the measurement signals I1 to In selectively in the cores of the optical waveguides LW1 to LWn, they also appear to have their associated receive radiation fields RF1 to RFn in a corresponding chronological order, ie here: the received radiation field RF1 for the optical fiber LW1 is received first. The received radiation fields RF2 to RFn -1 then follow one after the other until finally the received radiation field RFn assigned to the optical waveguide LWn arrives in the coupling area KB2 and exits there. The received radiation fields RF1 to RFn are at least partially detected or recorded in time, that is to say sequentially, by a common, preferably fixedly arranged, light-sensitive element GLE and each converted by this into an electrical measurement signal DS2. With digital signal evaluation, the measurement signal DS2 is transmitted via a signal line DL2 to a digitizer SUH of an evaluation device AE1. This digitizing element SUH samples the electrical measuring signals DS2 arriving one after the other at short time intervals, digitizes these sampling values and transmits digitized measuring signals DS3 via a line DL3 to a measured value memory MEM in the evaluation device AE1. From this measured value memory MEM, the recorded, digitized measurement data via a line DLS as a signal DSS to a display device DSP1, z. B. a display, forwarded and displayed there visually.

When using a large-area receiving element GLE, that covers all optical fibers to be measured, it is not required at the receiving end, e.g. B. the reception element GLE for a selective, distinguishable recording of the Receive radiation fields RF1 to RFn corresponding to Optical fiber LW1 activated one after the other to move LWn. An individual alignment of the Receiving element GLE on the activated light world lenleiter is thus no longer necessary. Nevertheless, it can if necessary for a further spatial resolution of the reception beam fields of application RF1 to RFn can also be advantageous, several Receiving elements, especially in line or array form instead of the common receiving element GLE, preferably two se fixed to attach. Suitable as receiving elements z. B. conventional photodiodes, CCD elements, diodes arrays, diode rows, etc.  

To determine and evaluate the coupling ratios in the measuring device ME, at least one reference measurement is expediently carried out first. For this purpose, the transmission radiation field SF can have a transmission level TP on the transmission side, which shows an arbitrarily predefinable time profile. For example, in FIG. 3 the transmission side is operated with an approximately temporally constant transmission level CTP, ie, while the light spot LF wanders over the coupling area KB1 of the bending coupler BK1, it illuminates the associated coupling-in sections TC1 to TCn along the curved waveguide LW1 to LWn with an almost constant transmission power or an almost constant transmission level CTP. The time-constant intensity or power distribution TP shown in FIG. 3 for the transmitted radiation field SF is during its shifting movement starting at the optical waveguide LW1 at the time tA somewhat above the optical waveguide LWn up to the time tE above that required for this Shift time t continuously recorded. The displacement time t corresponds to the displacement path y. During the time period tE-tA, the light spot LF travels through the coupling area KB1, so that the coupling sections TC1 to TCn each have the light spots LF1 to LFn individually assigned to them with a temporally constant illumination field strength of approximately CTP = 7.5 E ( 1E 1 light unit) are irradiated. The transmission radiation fields SF2 to SFn individually assigned to the optical waveguides LW1 to LWn, ie effective for them, thus have a constant transmission level in the shifting time interval tE-tA.

On the reception side (cf. FIG. 4), an associated temporal intensity or power distribution, ie temporal distribution, RP is recorded in the optical receiver OR1 for the reception radiation fields RF1 to RFn during the period tE-tA, as is the case with sequential transmission-side coupling of the transmission radiation field SF or the individually assigned transmission radiation fields SF1 to SFn arises. The light coupling begins with the optical waveguide LW1 and ends with the optical waveguide LWn, where n = 4. With an almost linear displacement movement of the light spot LF, the temporal distribution RP of the received radiation fields RF1 to RFn approximately corresponds to the local position of the optical waveguides, in particular the optical waveguide cores.

In the display device DSP1 of the evaluation device AE1 and in the associated enlarged representation of FIG. 4, the temporal distribution or the reception level RP of the received radiation fields RF1 to RFn is plotted with n = 4. When the transmission radiation field SF is passed on the transmission side, selective, distinguishable reception levels RH1 to RH4 appear in the display device DSP1 one after the other, each of which is individually assigned to the optical waveguide LW1 to LW4. The selective reception levels RH1 to RH4 each represent envelopes or interpolated for the digitized, sampled measurement signals in the case of digital signal evaluation, ie they correspond to the temporal distribution of the received radiation fields RF1 to RF4 in the case of a continuous or continuous transmission-side coupling. For example, the reception level RH1 assigned to the optical waveguide LW1 surrounds three discrete reception values DP1, DP2 and DP3, indicated by dash-dotted lines. Corresponding to the four optical fibers LW1 to LW4 or LW1 * to LW4 * provided in the ribbon cables BL1 and BL2, the four different envelopes RH1 to RH4, each with three discrete reception values, result, with the maxima of the envelopes RH1 to RH4 are designated with RM1 to RM4.

The four envelopes or reception levels RH1 to RH4 un differ in their temporal position or Position to each other as well as by their different large maxima RM1 to RM4, d. H. due to their level fluctuation The maxima RM1 to RM4 show the reception level RH1 to RH4, for example, the following values at times tM1 up to tM4 on the reception performance scale for the temporal Distribution RP on.

RM1 = 4 units
RM2 = 6 units
RM3 = 2 units
RM4 = 7.5 E (limit case with 100% coupling and decoupling)
(1E 1 light unit)

The receive beam assigned to the optical waveguide LW3 RF3 shows the reception level RH3 with the never third maximum RM3 while the light waves receive radiation field RF4 assigned to the conductor LW4 highest reception level RH4 with RM4 = 7.5 E within the group of four light waves to be measured conductor LW1 to LW4. While in the light waves conductor combination LW4 / LW4 * light almost ideal, d. H. without Attenuation losses, coupled in, guided and uncoupled the pair of optical fibers (LW3 / LW4 * has the greatest damping. So there are differences in the Level of the reception levels RH1 to RH4 or their maxima RM1 up to RM4, whereby for the Maxima RM4 and RM3 a maxi male level fluctuation by the factor RM4 / RM3 = 3.75 results.

From the snapshot of the temporal distribution RP of FIG. 4 it can also be seen that the reception level or the intensity / power distribution RH3 is shifted somewhat to the left to the reception level RH2 and is not in the middle between the two reception levels RH2 and RH4. Since, in the case of an ideally time-linear beam movement, the temporal distribution RP of the received radiation fields RF1 to RF4 largely corresponds to the local distribution or location of the cores of the optical waveguides LW1 to LW4, that is to say the location of maximum light guidance as shown, can from the temporal Distribution RP can be concluded that the optical waveguide LW3 or LW3 * is spatially shifted somewhat to the optical waveguide LW2. This relationship between the time and the local position of the optical waveguide is also given with step-by-step scanning with the same scanning steps. Even non-linear scanning movements of the transmission beam are possible as long as there is a defined relationship between the transmission-side coupling and the receiving-side coupling.

The different highs RM1 to RM4 as well as the non-equidistant position of the power or reception spec gel RH1 to RH4 can have different causes:

On the one hand, the coupling factors on the transmission side, on the Alignment point in the MS1 multiple splicer, as well as on the receiving side for each individual to be measured Fiber optics individually different from each other his. For example, different colors the optical waveguide in the ribbon cable BL1 or BL2 as e.g. B. red, green, yellow, blue or different colors orders as well as different coatings (Coat ings) different coupling factors, d. H. difference Coupling in and out coupling for each light wave head, result. Differences in the coupling factor Ren can also arise, for example, that Optical fibers from different manufacturing or Drawing process batches and thus, if necessary, from each other  different light guiding properties and fiber geometry trien combined into an optical fiber ribbon become. In addition, the coupling conditions are also through the positional tolerances of the optical fibers in the curvatures affects the bending coupler. The level differences or Level fluctuations (typically 10 dB) would be received tig in the optical receiver OR1 of optical fibers Different reinforcements necessary do. Switching to individual gain factor Ren for each individual optical fiber would therefore egg additional, high electronic and temporal Mean effort. In addition, due to the fluctuation according to the reception level or the temporal distribution RP on the receiver side only a relatively bad signal / / Noise ratio result because an optimal control only for one of the fiber optic combinations can be carried out and transmission side due to the ge wrinkle dimensions of the fiber optic cores in the right gel only relatively small light outputs in the light waves conductor cores can be coupled in and guided there.

On the other hand, the time distribution RP is also through the local position of the optical fibers LW1 to LW4 in the stripline BL1 or by the local location of the Optical fibers LW1 * to LW4 * in the ribbon cable BL2 and by assigning them to each other in the multiple Splicer MS1 affected.

To make, for example, subsequent actual measurements on the optical fibers LW1 to LWn or LW1 * to LWn * of these coupling ratios in the measuring device ME according to the invention largely independent, the time distribution RP of the received radiation fields RF1 is expedient to RFn z. B. evaluated by means of a computing unit CPU in the evaluation device AE1 of FIG. 1 and used for subsequent actual measurements for optimum transmission-side coupling. For this purpose, the receiving-end computing unit CPU is connected to the transmission-side control device ASV1 for the transmission / coupling device SK via a line SL3, that is to say the transmission side is "fed back" with the reception side (cf. FIG. 1). The control device ASV1 receives control signals SS3 via the line SL3 from the computing unit CPU, converts them into control signals AS1 and thus controls the optical transmitter OT1, preferably its transmission element TE, via a line AL1.

To improve the transmission-side coupling, several control criteria come into consideration, which can be obtained from the temporal distribution RP from FIG. 4 as information about the state of the optical waveguides LW1 to LWn or LW1 * to LWn *, in particular via their coupling ratios.

1. From the temporal distribution RP of FIG. 4, it follows that light is not irradiated into the cores of the optical waveguides LW1 to LWn with n = 4 at all times t in the time interval tE-tA during the displacement movement of the transmission radiation field of the SF . For this reason, it can be determined from the temporal distribution RP at which coupling times or at what time intervals light output in the optical waveguide cores is carried out at all.

To determine the coupling times, for example, rising edges of the reception level RH1 to RH4 are sought in the time distribution RP of FIG. 4. Their distances from the start time tA of the coupling on the transmission side thus determine those coupling times t1, t2, t3 and t4 from which light is actually coupled into the cores of the optical fibers LW1 to LW4. For this reason, it is sufficient for the operation of the measuring device ME to use the control device ASV1 to sense the transmission element TE in accordance with the reception sequence in time of the received radiation fields RF1 to RFn (see FIG. 5), ie only at the coupling times t1 , t2, t3 and t4 to switch on, emit the light LB for a certain period of time or during a coupling-in time interval T1 to T4 and then switch it off again. The transmission-side temporal sequence for light coupling is thus adapted to the previously recorded, temporal sequence or distribution of the received radiation fields at the receiving end. The coupling-in time intervals T1 to T4 are preferably selected only as long as light actually hits or falls on the coupling sections TC1 to TC4 (ie the cores) of the optical waveguides LW1 to LW4. The transmission radiation field SF is expediently coupled during coupling-in time intervals (for example T1) between 1 and 10% of the duration tE-tA of the movement of the light spot LF into the optical waveguides LW1 to LWn to be measured. For the successive coupling-in points t1 to t4 of the transmitted radiation field SF, time intervals such as e.g. B. t2-t1 between 3% and 30% of the total duration tE-tA egg nes passage of the light spot LF selected.

Fig. 5 illustrates this pulse-like switching on and off of the transmission element TE by means of the Ansteuervor direction ASV1 (see. Fig. 1). The time profile TP of the transmission radiation field SF thus has a transmission pause during its displacement movement over the free space between two adjacent optical fibers. The duration of the coupling-in time intervals T1 to T4, during which the transmission element TE is switched on and thus couples the radiation field SF light into the light waveguides LW1 to LW4, depends on the speed at which the beam deflection device emits the beam with a steady light spot movement steers over the individual fibers, and thus with an expedient periodic actuation of their frequency and amplitude, but also from the geometry of the light spot LF. If the size of the light spot and the amplitude are selected appropriately, the transmitted radiation field SF is coupled into the optical waveguides LW1 to LWn to be measured with n = 4 during the coupling-in time intervals T1 to T4 at an assumed repetition frequency of, for example, 1 kHz , whereby there are time intervals between 30 and 300 microseconds for the coupling times t1, t2, t3, t4.

Through the targeted control, d. H. Activation or Deactivation of the transmission element TE is achieved in that the performance of the transmission element TE much better can be exploited. While with common broadcasting stations elements such as B. light emitting diodes or semiconductor lasers mainly thermal effects of their maximum usable Limit performance, the transmission element TE by the Pulse operation, d. H. the transmission element TE is only during the short launch time intervals T1 to T4 turned on, far less stressed, so it while the short duty cycles T1 to T4 with increased current operated and thus a higher light output in the Optical fiber cores can be coupled. There the optical transmitter OT1 does not light off in continuous operation radiates, can advantageously be less on average Light output are given, so that in particular Problems with using a laser as a transmission element Eye safety can advantageously be defused.  

For the operation of the measuring device ME, it is therefore sufficient that the temporal distribution of the transmission level TP during the movement of the light spot LF over the coupling region KB1, ie during the period tE - tA, is only limited in time in coupling-in time intervals T1 to T4 the coupling-in sections TC1 to TCn are illuminated with individual transmission levels DTP1 to DTP4, DTP1 to DTP4 = 7.5 E = being constant in order to approximately obtain the reception levels RH1 to RH4 of FIG. 4. For approximately equal core diameters Lichtwel lenleiter LW1 to LW4, as they are approximately in the Bandlei device BL1 or BL2, the coupling time intervals T1 to T4 are expediently also chosen to be of approximately the same length, ie T1 = T2 = T3 = T4.

The optical waveguides LW1 to LW4 are assigned individual transmission radiation fields SF1 to SF4 with the same transmission levels DTP1 to DTP4 (= 7.5 E) during the illumination or coupling time intervals T1 to T4 at the coupling times t1 to t4 . The light spot LF of the transmitted radiation field SF is controlled by means of the temporal or the corresponding local position (cf. FIG. 4) of the received radiation fields RF1 to RF4 measured at the receiving end. On the reception side, the same temporal distribution RP of the reception radiation fields RF1 to RF4 then results, as is shown in FIG. 4 for the case of a continuously migrating, continuously radiating light spot LF. The pulsed operation can advantageously also be realized by the fact that the deflecting mirror BS ( FIG. 1) is abruptly (step by step) rotated so that only the coupling-in locations identified by the coupling-in times t1 to t4 are scanned with the light spot LF.

2. Fig. 6 shows another, with the help of the Ansteuervor device ASV1 controlled transmission level TP in the time interval tE-tA. From the temporal distribution RP of the reception level of FIG. 4, the computing unit CPU each determines its light outputs. The respective reception value of the maxima RM1 to RM4 can serve, for example, as a measure of the light output. The area under the selective reception levels RH1 to RH4 can also be used to determine the light output. By means of these light powers, the control device ASV1 controls the intensity or transmit power of the light spot LF on the transmission side in such a way that the reception side for the optical waveguides LW1 to LW4 is at approximately the same level of reception level, for example with maxima at about 8E. For this purpose, the computing unit CPU calculates z. B. from the differently sized maxima RM1 to RM4 of FIG. 4 individually for each fiber or for each optical waveguide, that transmission power in assigned time intervals TF1 to TF4 of FIG. 6, for the associated desired reception maxima (for example from 8E on the Receiving light power scale of Fig. 4) is required. The centers of the time intervals TF1 to TF4 shown as coherent each correspond approximately to the positions in which light is coupled into the cores of the optical waveguides LW1 to LW4. Instead of a constant scanning movement, the light spot LF can be operated in pulsed mode analogously to FIG. 5. Then the rectangles according to FIG. 6 have the same amplitude but with time periods only from T1 to T4.

To control the transmission level TP according to FIG. 6, the control device ASV1 receives the command from the computing unit CPU via the control line SL3 to control the transmission element TE in such a way that the light spot LF moved over the coupling area KB1 from the start time tA, ie starting with the coupling in at Optical waveguide LW1, during the coupling-in time interval TF1, radiates with an illumination field strength of approximately 11 E. This leads on the receiving side for the optical waveguide LW1 to a receiving level OH1 (cf. FIG. 8) with a maximum OM1 just below the desired receiving level of 8 E. In the time interval TF2, the computing unit CPU instructs the control device ASV1, the transmitting element TE to operate the lower transmission level TP = 9 E. On the reception side, a reception level OH2 with a desired maximum OM2 of approximately 8 E is then registered for the associated reception radiation field RF2 (cf. FIG. 8). If the CPU finds the received level RH3 for the received radiation field RF3 with the smallest maximum RM3 = 2 E in the group when searching through the time distribution RP, the transmitting side is instructed by the feedback on the receiving side, the light spot LF with a in the time interval TF3 to supply a higher light output of approx. 13 E. In the time interval TF4, the transmission level TP is finally reduced to approximately 7.5 E on the transmission side. On the reception side, the step-like control of the transmission level TP for all four reception radiation fields RF1 to RF4 approximately results in reception levels OH1 to OH4 with maxima OM1 to OM4 as shown in FIG. 8. The switching of the transmission level TP to the different transmission stages or power levels takes place approximately in the middle between two adjacent optical fibers, that is to say at the times

The transmission level TP is thus by means of the light outputs RH1 to RH4 of the received radiation fields RF1 to RF4 corrected or controlled in such a way that on the receiving side ge desired or specified light outputs for the received radiation fields RF1 to RF4 approximately ge can be measured. The sending side is thus by means of a kind of "feedback loop" from the receiving side operated under power control. Thereby one achieves that the coupling ratios in the measurement according to the invention direction ME to a certain extent independent of external Influencing factors for subsequent measurements are how e.g. B. of different color applications (e.g. red, green, yellow, blue) on the light waveguide to be measured tern LW1 bis LW4. The transmission power becomes individual set and optimized for each optical fiber that on the receiving side approximately the same, Emp catch level of about 8 E, so this can especially the signal / noise behavior of light waves conductors with unfavorable coupling conditions considerably be improved. For example, the Lichtlei the received radiation field SF3 for the light waveguide combination LW3 / LW3 * approximately to the level level of the least attenuated radiation field SF4 aligned. It will also be faster or more accurate measurement. Because by the attitude the same high reception level is not necessary dige, complex switching of amplifier stages in optical receiver OR1 because the individual light waves usually with very different coupling factors are applied. The transmission level TP can partially adjusted so that just enough light performance is available, as with the respective Optical fiber for optimal evaluation in the opti the OR1 receiver and in the subsequent evaluations facilities (e.g. SUH) is required.  

3. The two control variables presented according to 1) or 2) can be used independently of one another and with a particular advantage in combination to control the light spot LF. From the temporal distribution RP of the received radiation fields RF1 to RF4 to one another, the computing unit CPU determines both the temporal (corresponds to the local) position of the received radiation fields RF1 to RF4 and their associated light outputs, e.g. B. characterized by the maxima RM1 to RM4 (see FIG. 4).

As shown in Fig. 7, the transmission level TP is controlled such that the light spot LF is only switched on at the location of the light-guiding fiber core, that is, only in accordance with the reception-side sequence obtained from the reference measurement of Fig. 4 from light-guiding Coupling time intervals t1 to t1 + T, t2 to t2 + T, t3 to t3 + T, t4 to t4 + T.

The light spot LF only illuminates the coupling-in sections TC1 to TC4 of the optical waveguides LW1 to LW4 to be measured only during these specific coupling-in time intervals, while it is switched off in the remaining times of its movement. At the coupling times t1, t2, t3 and t4, the light spot LF with respect to its light output or illumination field strength changes due to the light outputs RM1 to RM4 obtained in the reference measurement (cf. FIG. 4) in such a way that reception levels OH1 to OH4 change as shown in Fig. 8. The light spot LF1 assigned to the optical waveguide LW1 (or its assigned transmission radiation field SF1) is therefore approximately assigned a maximum transmission power DM1 = 11 E in order to receive approximately a maximum reception power OM1 of 8 E on the reception side. The light spots LF2 to LF4 individually assigned to the other three light waveguides LW2 to LW4 (or their associated transmission radiation fields SF2 to SF4) are set as follows with regard to their maximum transmission powers DM2 to DM4:

TM2 = 9 units
TM3 = 13 units
TM4 = 7.5 U

The temporal or local distribution of the total sensor level TP thus has selective transmission levels DH1 to DH4 during the movement of the light spot LF in the time interval tE-tA, which have been supplemented to a certain extent inversely to the reception levels RH1 to RH4 of FIG. 4 in order to obtain the desired, approximately equal reception levels OH1 to OH4 of FIG. 8. The resulting maxima OM1 to OM4 of these reception levels OH1 to OH4 differ only slightly, mainly due to the measurement errors in the reference measurement, from one another, ie the reception levels OH1 to OH4 are associated with a small initial error from the reference measurement.

In the transmitter control according to FIG. 7, an amplitude modulation and additionally a pulse frequency modulation of the transmission pulses TH1 to TH4 are carried out.

On the one hand, this allows better utilization of the Light output of the transmission element TE. By the pulsbe can drive much higher light outputs into the ker ne the optical waveguide are coupled, since ther mix effects such as z. B. with LEDs or Semiconductor lasers occur are reduced. Thereby  can be on the receiving end, especially when hiring same high reception level, an improved signal / Noise ratio can be achieved. This enables before partly a faster or more precise measurement of the Measuring signals I1 to In in the optical fibers LW1 to LWn, because a time-consuming switchover is otherwise necessary ger amplifier stages in the optical receiver OR1 ent falls. This leads to a cost saving on the Sen on the receiving side and on the receiving side, since on the sending side common light emitting diodes (LEDs) with medium light output as well as light-sensitive elements on the receiving side without subordinate, complex amplifier stages used can be. On the other hand, through the individu Powerful transmission control for every light waveguide LW1 to LWn just as much light service provided, as with the respective Optical fiber for optimal evaluation in the opti OR1 receiver is required. Otherwise it could only through a complex switchover from amplifier stage can be achieved in the OR1 receiver, which is technical Problems, e.g. B. different offset voltages with would bring himself. On average, one is enough lower overall light output for operating the inventions measuring device according to the invention, so that in particular problems when using a laser as a transmission element eye safety can be defused. In the Application of the invention in portable, battery operated The devices also save energy weight, significantly reduced by the medium power requirement of the transmitting element light becomes. It can be used as a power supply use a lighter, lighter and cheaper battery be det.  

With the reception levels OH1 to OH4 recorded in FIG . B. the alignment process for the two ribbon lines BL1 and BL2 in the multiple splice direction MS1 (see FIG. 1). Two actuators SG1 and SG2 are provided in the multiple splicing device MS1 for moving the two ribbon lines BL1 and BL2 against one another. These can be actuated by the computing unit CPU via control lines SL1 or SL2 by means of control signals SS1 or SS2 or moved relative to one another. The computing unit CPU can advantageously based on the data in the memory MEM sequentially arriving data sets DS3 on the dependence of the transmission loss at the transition between the ribbon lines BL1 and BL2 (in the multiple splicer MS1) on the movement of the actuators SG1 and SG2. Since this dependency is measured individually for each fiber, it can be used advantageously for optimal alignment of the fibers. Furthermore, the measured values can expediently be used for controlling the splicing process and for determining the splice attenuation achieved.

According to the explanations of FIGS. 1 to 8, the method according to the invention can be used in particular to optimize the individual coupling power for each optical waveguide to be measured, in particular in an optical waveguide ribbon. This is achieved by first coupling any desired level in at least one reference measurement or in a type of calibration process into the optical waveguides to be measured, and receiving and recording the characteristic temporal distribution of the associated received radiation fields on the receiving side. From this temporal distribution, various criteria can be used to control the control criteria for the transmission-side coupling light spot, such as, for. B. its lighting field strength, be ne size and shape, its switch-on and / or its switching times, etc. can be determined. Through this type of "feedback" of the transmitting side with the receiving side, the coupling ratios for each light waveguide to be measured can be individually influenced to a certain extent, so that certain reception levels can be predetermined and can also be approximately maintained. It can also be advantageous to largely eliminate initial errors from the reference measurement by deration, ie by averaging several reference measurements.

The control of the light spot LF can also be supplemented to form a control loop, the control variables of which are determined and provided in a manner analogous to FIGS. 1 to 8 from the time distribution. The control device for the transmission / coupling device SK then expediently has a control circuit with internal feedback.

In addition, the method according to the invention and the associated measuring device according to the invention can also be used to solve a large number of further problems of single-fiber and multi-fiber technology. For example, the measuring device ME in FIG. 1 can also be part of a production line for optical waveguide ribbons and can be used for production control or production monitoring of the optical waveguide ribbons. The optical waveguides LW1 to LWn are withdrawn coming from the left to the right through the measuring device ME and in addition pass through an extruder in front of the transmitting / coupling device SK. This extruder surrounds the optical waveguides LW1 to LWn, which are guided almost parallel to one another, only with an outer sheath AH1, as indicated for illustration in the left part of FIG. 1. The fiber optic ribbon BL1 thus produced then runs in the transmitting / coupling device SK in the coupling device KV1 over the cylindrical mandrel ZT1 of the bending coupler BK1, which as z. B. movable role is formed. When passing through the coupling device KV1, a test light LB (continuously or at certain time intervals) is coupled into the optical waveguides LW1 to LWn according to FIGS . 1 and 2 one after the other by means of the optical transmitter OT1. After passing through a predeterminable test section (the multiple splicing device MS1 is to be omitted here) of the light waveguide ribbon BL1, light components from the test light or measurement signals I1 to In are taken with the optical receiver OR1 from FIG. 1 and fed to the evaluation device AE1. For this purpose, the optical fiber ribbon Chen BL1 analog to the transmission side also via a z. B. trained as a movable roller cylinder ZT2 in the bending coupler BK2, so that by means of the light-sensitive element GLE of the optical receiver OR1, the temporal distribution RP of the decoupled received radiation fields RF1 to RFn is detected and recorded in the measured value memory MEM of the evaluation device AE1 or can be filed. In addition, the time distribution RP is visually shown in the display device DSP1 of the evaluation device AE1. In this way, the temporal distribution RP is provided for evaluation. Statements and information about various states of the optical fibers LW1 to LWn in the optical fiber ribbon BL1 can now be obtained from the recorded temporal distribution RP of the received radiation fields of the RF1 to RFn:

1. From the time distribution RP z. B. the local position of the optical fibers LW1 to LWn with n = 4 in the optical fiber ribbon BL1 can be determined. The reception levels RH1 to RH4 are individually assigned to the optical fibers LW1 to LW4 in the optical fiber ribbon BL1 in a unique manner. Their maxima RM1 to RM4 each characterize the locations of maximum light guidance in the optical fibers LW1 to LWn with n = 4, that is, their core positions. From the moment recording of the display device DSP1 of FIG. 1, it thus follows that the optical waveguide LW3 is set to the left on the optical waveguide LW2 in the outer envelope AH1, so that the optical waveguides LW1 to LWn with n = 4 are not equi are distant embedded in the outer envelope AH1.

The computing unit CPU detects this deviating state of the optical waveguide LW3 and then instructs the control device ASV1 via the control line SL3 to correct the extrusion process in the extruder via a specially provided control line (not shown in FIG. 1). Because of it is possible to produce an optical fiber ribbon, in the outer covering of which the optical fibers can be inserted precisely in predefinable positions. At the same time, the local distribution of the optical waveguide cores can be specified precisely, which plays a role, for example, for quality assurance measures and simplifies handling with the optical waveguide ribbons, particularly during splicing processes.

2. In order to ensure that the optical fibers LW1 to LWn with n = 4 are surrounded by the extrusion process with a uniformly thick outer shell AH1, the maxima RM1 to RM4 of the measured reception levels RH1 to RH4 from FIG. 4 are analyzed. It can be concluded from the differently high reception levels RH1 to RH4 in the snapshot of the display device DSP1 that the optical waveguide ribbon thickness transversely to the longitudinal axis of the optical waveguides LW1 to LWn is different or fluctuates with n = 4. The received radiation field RF3, which is assigned to the optical waveguide LW3, has the lowest reception level RH3 in the snapshot. It can be concluded from this that the optical waveguide LW3 experiences the greatest attenuation on the transmission side. This indicates a thicker coating at the location of the LW3 fiber. To control and control the coating process, the computing unit CPU determines the power level. B. the maxima RM1 to RM4, from the time distribution RP. The computing unit CPU controls the coating process by means of the control device ASV1 in such a way that the power levels RH1 to RH4 are approximately the same, that is to say are within a predeterminable tolerance range. In this way, the optical fibers LW1 to LWn are embedded transversely to their longitudinal axis by an outer sheath AH1 of the same thickness, even if the optical fibers should have different diameters from one another. In addition, the performance maxima RM1 to RM4 can be recorded and registered for quality assessment of the manufacturing process for the respective fiber optic ribbon.

3. Originate the optical fibers LW1 to LWn with n = 4 different production batches, that means she knows different fiber geometries and fiber properties up, so these can be determined by means of the temporal Distribution RP can be precisely documented and for the Fer of the fiber optic ribbon BL1 and for subsequent manufacturing steps or further applications be recycled. In particular, marks and re presents the temporal distribution RP the individu The state of the optical fibers LW1 to LWn in the Band line BL1 or a group of loose side by side  single fiber optic cable LW1 to LW4. Out the time distribution RP can therefore be advantageous Reference values and reference values for subsequent measurements tasks with the BL1 or the group of optical fibers.

In addition, the method according to the invention can, for. B. also in a dye line and in other coating or coating method for optical fibers be set. The coating process for each individual fiber optic individually the measurement information from the temporal distribution taken, assessed and controlled.

In addition, the method according to the invention also offers the possibility of automatically recognizing the number of individual light waveguides LW1 to LWn from the temporal distribution RP of the received radiation fields RF1 to RFn. This can be important for example with fiber optic bundles with a larger number of more or less loose optical waveguides. It is particularly advantageous that the state of each individual optical waveguide or each individual optical fiber can be unambiguously taken from the time distribution. Due to the measured reception level in the temporal distribution and their assignment to each other, it is advantageously possible to uniquely identify each individual optical waveguide within this group. This plays a role, for example, in the case of spatially distant ends of two groups with a plurality of optical fibers, the optical fibers of which are to be connected to one another in a unique manner to correspond to pairs of optical fibers. Furthermore, an alignment of the two ribbon lines BL1 and BL2 in FIG. 1 can also be monitored and controlled using the measuring method according to the invention. For this purpose, the two ribbon lines BL1 and BL2 are expediently moved back and forth against each other (jitter movement), so that by means of the temporal change in the reception level in the temporal distribution RP information about the mutual position of the optical waveguide or combinations of optical waveguides correspond , such as B. LW1 / LW1 * can be obtained.

Furthermore, the inventive method can some of the information about lighting routing features and fiber geometries of the optical fibers or deliver optical fibers themselves. For example can from the temporal distribution of the measured Emp capture radiation fields each the location of maximum light leadership in the assigned optical fibers, the is called their core locations, uniquely localized become. From the power levels in the temporal ver division, various transmission parameters can be used for Optical fibers, such as phase delays, Through loss, transmission loss, splice Damping, eccentricities of the fiber core, etc. be be true.

FIGS. 9 and 10 illustrate the spatial Ge Stalt of the light spot LF. Fig. 9 applies analogously to FIG. 2, a scan or scanning plane x and y with the coordinate axes fixed. The x-axis identifies the beam direction or direction of propagation of the transmitted radiation field SF. The y-axis points in the scanning or displacement direction of the transmitted radiation field SF transversely to the longitudinal axis of the optical waveguides LW1 to LWn to be measured in the coupling area KB1. In FIG. 9, only a curved section of the optical waveguide LW1 is shown for illustration, while the remaining optical waveguides LW2 to LWn to be measured have been omitted. The transmitted radiation field SF, which is indicated in a schematic manner by dash-dotted lines in this drawing plane, enters with its light spot almost tangentially into the core of the curved optical waveguide LW1 at the coupling-in location in the region of the coupling-in section TC1 shown in dash-dotted lines. The coupling-in section TC1 is expediently illuminated by the light spot up to approximately 1 mm along the optical waveguide LW1. If necessary, the light spot can also directly open the front face z. B. illuminate the optical fiber LW1 if it is accessible.

Fig. 10 shows a schematic view of the light spot together with the ribbon cable BL1 in a sectional plane, which is obtained by a cut perpendicular to the drawing plane of Fig. 9 along the section line S1, S2 at the point of coupling of the transmission radiation field SF into the optical waveguide LW1. FIG. 10 shows an imaginary coupling-in plane with the coordinate axes y and z perpendicular to the propagation or beam direction x of the emitting radiation field SF for better illustration of the spatial shape of the light spot LF. The optical waveguides LW1 to LWn have different diameters from each other and are combined in the ribbon cable BL1. The cores C1 to Cn of the optical waveguides LW1 to LWn are not arranged exactly along a straight line parallel to the scanning direction y at the respective coupling-in location, but are somewhat offset from one another in different spatial positions in the outer jacket AH1 of the ribbon cable BL1. The cores C1 to Cn may also have non-equidistant distances from one another in the scanning direction y. The reason for the positioning of the cores deviating from the ideal distribution in the z and / or in the y direction can be e.g. B. be that the cores C1 to Cn each in their outer coating envelope (coating) CT1 to CTn eccentric, ie not in the center (z. B. in single-mode optical fibers, the core eccentricities are of the order of about 2 to 3 µm). In addition, fluctuations in the application thickness of their common outer sheath AH1 can result, in particular, when combining the differently thick optical waveguides LW1 to LWn to form the ribbon BL1, so that the optical waveguides LW1 to LWn occupy different spatial positions, preferably in the z direction. The light spot LF is now advantageously designed in terms of its spatial shape in such a way that it illuminates only one of the cores C1 to Cn of the optical waveguides LW1 to LWn during the movement of the transmitted radiation field in the scanning direction y, wherein in each case largely avoided coupling of light into adjacent optical waveguides is.

In Fig. 10 is advantageous for the light spot LF in the Einkoppelebe ne y, z at the coupling location of the optical waveguide LW1. B. an approximately slim oval or elliptical, approximately strip-shaped or linear cross-sectional shape with orientation of its longitudinal axis in the z-Rich direction selected. The light spot LF thus has an uneven cross-sectional shape, which at the coupling point is perpendicular to the propagation direction x and shows a preferred direction in the z direction. Its spatial extent in the z-direction, that is, perpendicular to the direction of propagation x, is selected before ge ge larger than in the scan or scanning direction. The transmit radiation field SF in FIG. 10 is aligned, for example, to the core C1 of the optical waveguide LW1, so that the associated light spot LF illuminates the core C1 approximately symmetrically with respect to its center. It has a spatial expansion in the z direction, which ensures that the cores C1 to Cn are also scanned in an arrangement in different z spatial positions in the strip line BL1 by the light spot LF of the transmitting radiation field SF traveling in the y direction and reliably illuminated in the z direction. The spatial extent of the light spot LF in the z-direction at the coupling location is expediently chosen so that expected positional tolerances of the optical fiber cores C1 to Cn, which can also be achieved in particular through the use of ribbons of different thicknesses in the bending coupler BK1, are thus compensated . In practice, band tolerances can be expected, the sum of which will preferably reach about ± 50 µm. In this way, the light coupling of fluctuations or tolerances in the optical fiber ribbon thickness (such as the unevenly thick or inhomogeneous application thickness of the outer sheath AH1), as well as the fiber geometries of the optical fibers LW1 to LWn (such as the core eccentricities and different fiber optic diameters due to different production batches), the different radii of curvature of the light waveguides LW1 to LWn, the light spot imaging itself, etc. are advantageously made independent. If a thin outer sheath AH1, that is to say one that is not heavily applied to the outer envelopes CT1 to CTn, the light spot LF expediently has a spatial extent in the z-direction at the coupling-in location that is at least half the light waveguide ribbon thickness or approximately half the outside diameter of the respective optical waveguide, preferably between 100 µm and 200 µm. In the case of thick optical waveguide tapes or optical waveguides with larger outside diameters, the length of the light spot LF in the z direction is expediently chosen to be correspondingly larger. In this case, it is generally sufficient for the light spot LF to extend in the z direction at the coupling-in location in the order of magnitude of the thickness or outer diameter of the respective optical waveguide or the respective thickness of the optical waveguide ribbon BL1. The longitudinal extent of the light spot LF is thus expediently adapted to the type in the z direction that during the scanning movement of the transmitted radiation field SF a 10952 00070 552 001000280000000200012000285911084100040 0002004235313 00004 10833 focused coupling into the cores C1 to C1 to the light waveguide L to the light waveguide LF is also largely largely ensured if the cores C1 to Cn in the z direction take up different spatial positions or spatial positions at the coupling location in the ribbon cable BL1.

The transmission radiation field SF is in particular by a beam deflection device, such as. B. the pivotable mirror BS of Fig. 2, laterally in the y-direction, ie transversely, to the longitudinal extent (axial extent) of the ribbon cable BL1 or to the optical fibers LW1 to LWn, so that it is sequential, ie successively, each is directed onto the curved optical waveguides LW1 to LWn at the respective coupling-in location in the coupling area KB1 (cf. FIG. 1). The movement of the transmitted radiation field SF can advantageously be carried out in various ways:

A1) The transmission radiation field SF is moved continuously, ie continuously in particular linearly, over the coupling area KB1 (cf. FIG. 1), so that the coupling area KB1 and thus the coupling-in locations of the optical fibers LW1 to LWn are continuously covered.

A2) The transmission radiation field SF is gradually or ge grids, d. H. in sampling steps or jumps in on coupling positions brought the light to be measured waveguides are each assigned. Aligned at the respective coupling locations of the fiber optic core ne C1 to Cn is fixed there.  

Regardless of the radiation field movement type the transmitted radiation field SF advantageously distinguished activated or switched:

B1) The transmission radiation field SF is continuously removed shines so that a continuously shining light spot LF in the coupling plane y, z during the beam field motion is formed.

B2) The transmitted radiation field SF is switched on and off in a predeterminable sequence, ie keyed, or operated in pulsed fashion with switch-on and dead times, so that a pulsed or keyed light spot LF in the coupling plane y, z for specifiable coupling positions tion of the transmitted radiation field SF is formed in particular in the area of the coupling-in locations of the curved light waveguides LW1 to LWn. For example, the transmission level TP or the course of the intensity distribution of the transmission radiation field SF can be keyed according to FIGS. 5, 6 or 7.

The light spot LF advantageously has a beam or illumination field width LFB in all four operating modes A1, A2, B1, B2 in the scanning or scanning direction y such that during the translational, lateral movement of the transmitted radiation field SF In the optical waveguides LW1 to LWn to be measured, measurement signals I1 to In assigned (cf. FIG. 1) are selectively activated and in each case a light coupling in neighboring optical waveguides is avoided as far as possible. For this purpose, the beam width LFB of the light spot LF in the scanning direction y is in each case advantageously smaller than the distance KB between two adjacent light waveguide cores (for example C1, C2). Taking into account the tolerances of the fiber geometries, in particular the core eccentricities (e.g. KE1, KE2), two adjacent optical fibers (e.g. LW1, LW2) results in an upper limit for the beam-wide LFB, the core radii with KR1, KR2 are designated:

OG = KB - (KR1 + KR2) - (KE1 + KE2) LFB

For single-mode optical fibers in a tightly packed package The following fiber optic ribbon applies approximately:

KB = 250 µm, KR1≈KR2≈10 µm, KE1≈KE2≈2.5 µm and thus OG ≈225 µm.

In this way it is advantageously ensured that the received radiation received at the receiving end fields RF1 to RFn largely selective, i. H. Cut from each other, so that a selective, indi visual evaluation of the time distribution RP of the Receiving radiation fields RF1 to RFn becomes possible.

The beam width or spatial extension LFB of the Light spots LF in the scanning direction y can expediently sometimes at the respective coupling-in location for the measuring optical fiber under consideration of the respective fiber optic core diameter KD can be set as follows:

a) LFB≈KD
b) LFB <KD
c) LFB <KD

Depending on the respective operating mode of the Transmitting radiation field SF or combinations of the Operating modes A1, A2, B1, B2 becomes the beam width LFB advantageously according to a), b) or c) under consideration adjustment of the upper limit upper floor adjusted:

I. The transmission radiation field SF is operated according to A2) and B2), that is: the transmission radiation field SF is gradually moved into its local coupling positions for the coupling locations of the curved light waveguides LW1 to LWn, and is there on the Cores C1 to Cn of the optical fibers LW1 to LWn are aligned. While the transmission radiation field SF is fixed there, it is switched on for a predefinable time period or a coupling time interval (for example T1 in FIG. 5).

In this case, one at the coupling location standing light spot LF a reliable light To be able to ensure coupling becomes the jet pulp te LFB for the light spot LF expediently ent speaking selected a) or b).

With a selected beam width according to c) would be a goal exact meeting of the respective core based on the ge wrestle extension of the light spot LF in the scanning direction y under the given tolerances of the movement process may be difficult. In case a), d. H. LFB≈KD, is a far less exact compared to case c) Alignment required to the respective Lichtwel to meet core conductor core, d. H. the light spot LF and each core approximately to cover bring. Case b), d. H. LFB <KD, because then even with an inexact stop direction of the transmission radiation field SF on each dwelling core in the y direction this core of light fleck LF can be fully illuminated. In  that as the lower barrier UG for the beam width LFB expediently at least equal to the core knife KD plus the sum of all y tolerances of each because optical fiber is chosen, the Light coupling also independent in the scanning direction y of tolerances and fluctuations during the scan process are made, such as. B. from Kernzentrzentri non-equidistant light waves conductors in y direction, imprecise guidance and alignment device of the transmission radiation field SF, etc. . . . For the Beam width LFB therefore applies:

OG <LFB <UG

II. The transmission radiation field SF is according to A2) and B1) driven, d. h .: the transmission radiation field SF jumps "point by point" from coupling position to coupling Position of the optical fibers LW1 to LWn and stands there for a predefinable coupling time interval. During this raster movement over the entire head The range KB1 remains the transmitted radiation field SF constantly on. The beam width LFB is then appropriately selected according to (I).

III. The transmitted radiation field SF is operated according to A1) and B1), ie the curved waveguides LW1 to LWn are continuously swept by the transmitted radiation field SF, the light spot LF being continuously (continuously) illuminated. For reliable light coupling, the beam width LFB of the light spot LF can expediently be selected in accordance with c), ie the light spot LF is particularly advantageously mapped as linearly as possible in the coupling plane y, z. The beam width LFB is al so smaller than the respective core diameter KD ge selected, so that LFB <KD applies. As a result, light can be optimally coupled into the respective core and with a particularly high time resolution ( FIG. 4) who couples it into the respective optical waveguide or its core. By continuously moving the linear light spot LF over the core of the respective optical waveguide at the coupling location, it is reliably ensured that the respective core is hit regardless of tolerances and fluctuations in the scanning direction y. For the sweeping time UT, which the light spot LF needs at a speed LFV for sweeping over the respective coupling-in location, in particular the optical fiber core diameter KD, approximately applies

With a scan frequency of 20 Hz for the whole Coupling area KB1 with four to a ribbon cable summarized optical fibers thus result approximately a sweep time of UT = 500 µsec for the respective fiber optic core. Reception on the one hand, neglecting the An Talk time of the optical receiver OR1 and / or Evaluation device AE1 is approximately rectangular Impulse approximately the duration UT for the respective against optical fiber.

IV. The transmission radiation field SF is operated according to A1) and B2), ie the transmission radiation field SF is moved continuously over the coupling area KB1, whereby it is switched on and off, ie keyed, in a predeterminable sequence. For example, it can be pulsed accordingly with 7 of FIG. 5.

The transmit radiation field SF is therefore not stopped in the respective coupling position, ie while the transmitter is activated - T1 to T4 in FIG. 5 - but is continuously moved on. The transmitter radiation field SF is expediently switched on before reaching the respective coupling location, so that the light spot LF can run over the respective optical fiber core, and switched off again after leaving the Einkoppelor tes or optical fiber core. The respective fiber optic core C1 to Cn is advantageous with a light spot LF accordingly III. scanned, the spatial extent LFB in the scanning direction y can be chosen smaller than the respective core diameter KD. It is chosen with advantage for the beam width LFB <KD accordingly case c).

The launch time intervals for a selective launch development of measurement signals in cases I. and II largely through the response times or settling time th of the elements in the optical receiver OR1 (e.g. the ge common light-sensitive element GLE) and / or in the receiving device AE1 (e.g. Di gitalizing member SUH).

Claims (46)

1.Procedure for measurements on a plurality of optical fibers (LW1 to LWn), light (LB) being coupled on the transmission side into the respective optical fibers to be measured (LW1 to LWn) and part of this light (LB) being coupled out and evaluated on the receiving side, thereby characterized in that a transmission radiation field (SF) with its light spot (LF) is moved successively in time over coupling-in sections (TC1 to TCn) of the optical waveguides to be measured (LW1 to LWn) and is coupled into them, that on the receiving side is assigned to the coupling-in coupling Receiving radiation fields (RF1 to RFn) of the optical waveguides to be measured (LW1 to LWn) are recorded in their temporal distribution (RP) to one another, and that this temporal distribution (RP) is provided for evaluation. 2. The method according to claim 1, characterized, that from the temporal distribution (RP) of the receive beam fields (RF1 to RFn) the local position of the light world lenleiter (LW1 bis LWn) determined and used for evaluation is provided. 3. The method according to any one of the preceding claims, characterized, that by means of the temporal distribution (RP) of the reception Radiation fields (RF1 to RFn) on the transmission side of the light spot (LF) of the transmission radiation field (SF) is controlled. 4. The method according to claim 2, characterized, that the location of the optical fibers (LW1 to LWn) is represented and / or recorded.   5. The method according to any one of the preceding claims, characterized, that from the temporal distribution (RP) of the receive beam fields (RF1 to RFn) each have their light outputs determined and made available for evaluation. 6. The method according to claim 5, characterized, that by means of these light outputs the light on the transmission side spot (LF) of the transmitted radiation field (SF) is controlled. 7. The method according to any one of claims 5 or 6, characterized, that the light outputs of the individual optical fibers (LW1 to LWn) are shown and / or recorded. 8. The method according to any one of the preceding claims, characterized, that in at least one reference measurement the temporal ver division (RP) of the received radiation fields (RF1-RFn) it is understood that from this the local position of the to be measured Optical fibers (LW1 to LWn) as well as the guided in them th light outputs are determined, and that by means of control variables on the transmission side each coupling time and Transmission power of the transmission radiation field (SF) during ner movement over the coupling sections (TC1-TCn) of the Optical fiber to be measured (LW1-LWn) for follow up measurements can be defined. 9. The method according to any one of the preceding claims, characterized, that the transmission radiation field (SF) during coupling time intervals between 1 and 10% of the duration of the movement of the Light spot in the optical waveguide to be measured (LW1- LWn) is coupled, whereby for the coupling times of  Transmitted radiation field (SF) time intervals between 3 and 30% of the duration of the light spot movement can be selected. 10. The method according to any one of the preceding claims, characterized, that during the movement of the light spot (LF) over the Coupling sections (TC1 to TCn) of the light to be measured waveguide (LW1 to LWn) each its transmission power by means of the temporal distribution (RP) of the receive beam tion fields (RF1 to RFn) is controlled such that em on the trap side, each receive radiation of approximately the same size fields (RF1-RFn) are included. 11. The method according to any one of the preceding claims, characterized, that the light spot (LF) of the transmitted radiation field (SF) on the transmission side by means of the temporal distribution (RP) of the received radiation fields (RF1 to RFn) controlled is that the respective signal / noise ver ratio for the optical fibers to be measured (LW1 bis LWn) is optimized. 12. The method according to any one of the preceding claims, characterized, that the light spot (LF) of the transmitted radiation field (SF) by means of the temporal distribution (RP) of the reception Radiation fields (RF1 to RFn) is controlled in such a way that the average transmit power of the transmit radiation field (SF) while moving over the light to be measured waveguide (LW1 to LWn) is reduced. 13. The method according to any one of the preceding claims, characterized, that the transmit radiation field (SF) is transmitting during its side movement with its light spot (LF) continuous  Lich to measure the coupling sections (TC1-TCn) the optical fiber (LW1 to LWn) is emitted. 14. The method according to any one of claims 1 to 12, characterized, that the transmit radiation field (SF) is transmitting during its sided movement with its light spot (LF) on the one coupling sections (TC1-TCn) of the light waves to be measured conductor (LW1 to LWn) is emitted in pulse mode. 15. The method according to any one of the preceding claims, characterized, that the transmit radiation field (SF) with its light spot (LF) continuously over the optical fibers to be measured (LW1 to LWn) is moved. 16. The method according to any one of claims 1 to 14, characterized, that the transmit radiation field (SF) with its light spot (LF) step by step over the optical waveguide to be measured ter (LW1 to LWn) is moved. 17. The method according to any one of the preceding claims, characterized, that the light to be coupled (LB) abge on the transmission side is directed that it applies to the coupling sections (TC1 to TCn) of the optical fibers to be measured (LW1 to LWn) is mapped sequentially. 18. The method according to any one of the preceding claims, characterized, that the coupling of the light spot (LF) of the transmission Radiation field (SF) according to the bending coupler principle to be led.   19. The method according to claim 18, characterized, that the coupling sections (TC1 to TCn) of the measure the optical fiber (LW1 to LWn) in the end area the curvature of the curved optical fibers (LW1 to LWn) at the transition to their straight lines sections of the light spot (LF) are illuminated. 20. The method according to any one of claims 1 to 17, characterized, that the light spot (LF) of the transmitted radiation field (SF) one after the other over the open ends of the measuring optical fiber (LW1 to LWn) is moved. 21. Device (ME) for measurements on multiple lights waveguides (LW1 to LWn) with an optical transmission / Coupling device (SK), which to the respective to be measured Optical fiber (LW1 to LWn) can be coupled, as well as with an optical receiver (OR1) that has at least one Em pfangselement (GLE), which an evaluation device (AE1) is assigned, characterized, that the transmission / coupling device (SK) is formed in such a way is that a transmission radiation field (SF) with its light spot (LF) over coupling sections (TC1 to TCn) of the optical fibers to be measured (LW1 to LWn) Movable in time and can be coupled into it and that in the optical receiver (OR1) the receiving element ment (GLE) is aligned and designed so that this receive assigned to the coupling on the transmission side Radiation fields (RF1 to RFn) of the light wave to be measured lenleiter (LW1 bis LWn) in their temporal distribution (RP) detected, received signals (DS2) generated, and this feeds an evaluation device (AE1).   22. Device according to claim 21, characterized, that the optical fibers to be measured (LW1 to LWn) me are connected mechanically, preferably in the form an optical fiber ribbon (BL1, BL2). 23. Device according to one of claims 21 or 22, characterized, that in the transmitting / coupling device (SK) a bending coupler (BK1) is provided. 24. Device according to one of claims 21 to 23, characterized, that a display device in the evaluation device (AE1) device (DSP1) for the temporal distribution (RP) of the Receiving radiation fields (RF1 to RFn) is provided. 25. Device according to one of claims 21 to 24, characterized, that in the evaluation device (AE1) a measured value memory (MEM) for recording the time distribution (RP) of the Receiving radiation fields (RF1 to RFn) is provided. 26. Device according to one of claims 22 to 25, characterized, that on the transmission side a control device (ASV1) for the Transmitting / coupling device (SK) is provided. 27. Device according to claim 26, characterized, that the transmission-side control device (ASV1) such ver with the receiving device (AE1) is tied that by means of the temporal distribution (RP) of the received radiation fields (RF1 to RFn) on the transmission side the light spot (LF) of the transmitted radiation field (SF) steu is noticeable.   28. Device according to one of claims 21 to 27, characterized, that in the evaluation device (AE1) a computing unit (CPU) is provided that the temporal distribution (RP) evaluates the received radiation fields (RF1 to RFn). 29. Device according to one of claim 28, characterized, that the computing unit (CPU) is designed such that from the recorded with the receiving element (GLE) men receive signals (DS2) control signals (SS3) for the control device (ASV1) selectively for the measuring optical fibers (LW1 to LWn) can be derived. 30. Device according to one of claims 21 to 29, characterized, that in the transmission / coupling device (SK) a beam steering device for the movement of the transmission radiation field (SF) is provided. 31. Device according to claim 30, characterized, that as a beam deflection device, a rotatable mirror (BS) is provided. 32. Device according to one of claims 21 to 31, characterized, that between the optical transmission / coupling device (SK) and the optical fibers to be measured (LW1 to LWn) Imaging optics (E0) is arranged. 33. Device according to one of claims 21 to 32, characterized, that means (SG1, SG2) for aligning those to be measured Optical fibers (LW1 to LWn; LW1 * to LWn *) in one Multiple splicer (MS1) are provided.   34. Device according to one of claims 21 to 33, characterized, that the device (ME) is part of a light wave conductor splicer. 35. Device according to one of claims 21 to 33, characterized, that the device (ME) is part of a light wave Head attenuation meter is. 36. Device according to one of claims 21 to 35, characterized, that a rule for controlling the light spot (LF) circuit with internal feedback is provided. 37. Method for coupling light (LB) into several Optical fibers to be measured (LW1 to LWn), whereby the Light (LB) one after the other in the measured Optical fiber (LW1 to LWn) is coupled into the special according to one of the preceding claims, characterized, that a transmit radiation field (SF) is spatially reproduced in such a way Det is that a light spot (LF) with a larger space expansion perpendicular to the direction of propagation (x) of the transmit radiation field (SF) than in its scan tion (y) is generated, and that by means of this light spot (LF) coupling sections (TC1 to TCn) of the optical fibers to be measured (LW1 to LWn) be lit. 38. The method according to claim 37, characterized, that in each case the spatial shape of the light spot (LF) Art is adjusted that during the scanning movement of the Light spot (LF) the optical waveguide (LW1 to LWn),  especially their cores (C1 to Cn), also in each other different locations. 39. The method according to any one of claims 37 or 38, characterized, that the transmitted radiation field (SF) is mapped in such a way that an approximately linear light spot (LF) perpendicular to Direction of propagation (x) of the transmitted radiation field (SF) is produced. 40. The method according to any one of claims 37 to 39, characterized, that the light spot (LF) in the scanning direction (y) is smaller than the outer diameter of the respective light wave to be measured lenleiters is selected. 41. The method according to any one of claims 37 to 40, characterized, that the spatial extension of the light spot (LF) in Ab scanning direction (y) depending on the transmitted radiation Field operating mode approximately equal to the core diameter (KD) of the respective optical fiber is selected. 42. The method according to any one of claims 37 to 40, characterized, that the spatial extent of the light spot (LF) in Scanning direction (y) depending on the transmission Radiation field mode larger than the core through knife (KD) of the respective optical fiber selected becomes. 43. The method according to any one of claims 37 to 40, characterized, that the spatial extension of the light spot (LF) in Ab scanning direction (y) depending on the transmitted radiation  field operating mode smaller than the core diameter (KD) of the respective optical fiber is selected. 44. The method according to any one of claims 37 to 43, characterized, that the spatial extent of the light spot (LF) lower right to the direction of propagation (x) of the transmitted radiation field (SF) at least equal to half the outer diameter of the respective optical fiber is selected. 45. Device for coupling light (LB) into several optical fiber to be measured (LW1 to LWn) with a optical transmission / coupling device (SK), which to each because optical fibers to be measured (LW1 to LWn) can be coupled, in particular according to one of the preceding the claims characterized, that in the transmission / coupling device (SK) means for Ab Formation of a transmit radiation field (SF) pre-so can see that the light spot (LF) they created a larger spatial dimension perpendicular to the spread direction (x) of the transmitted radiation field (SF) as in its scanning direction (y) and after each other to measure coupling sections (TC1 to TCn) the optical fiber (LW1 to Lwn) illuminated. 46. Device according to claim 45, characterized, that as a means of mapping the transmit radiation field (SF) a mirror or a slit diaphragm is provided.