DE2358094A1 - DEVICE FOR A FIBER FIBER ARRANGEMENT FOR TRANSMITTING SIGNALS - Google Patents

Description

Device for an optical fiber arrangement for transmitting signals.

The invention relates to a device for a Optical fiber arrangement for transmitting signals from one signal channel to another. _

There are devices for transmitting signals from a ' Optical fiber known to another * Such a device consists of a fiber optic distributor head, the a movable for this purpose, with; at least one optical ore photoelectric probe element equipped probe head opposite- - stands. Such devices are used, for example, for photoelectric Readers. The optical fibers transmit the light and dark values , which is picked up by the scanning head and from there - possibly with the interposition of an optical fiber - to a photoelectric Element. In a known embodiment, the optical fibers are arranged in a circle in a distributor head; the probe head cyclically at the front ends of the optical fibers is moved past and in each of the individual optical fibers transmits pending signals to the photoelectric element. ; . . "". ": ■" .-.

Optical fibers are also becoming more high-frequency for transmission Signals used, the amplitude-modulated light waves ■ serve as a carrier of information. Different optical fibers can serve as channels for transmitting specific information, e.g. a television program. Desirable is to select one from several optical fibers Channel to a signal converter, e.g. to an evaluation unit, an oscilloscope or on the screen of a television set, transferred to. Here, however, is on one possible exact modulation of the selected channel or the selected one To pay attention to the light guide. Contact damage

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äer end faces of the optical fibers through the probe element as well as mutual influencing of optical fibers arranged adjacent to the selected channel during the selection process must be avoided, as well as excessive damping. The invention has the task based on a device, namely a fiber optic switch, for an optical fiber arrangement for transmission of signals from one signal channel to another, in compliance with the above conditions.

Based on the known device mentioned at the beginning for an optical fiber arrangement for transmitting signals from one channel to another, consisting of an optical fiber distribution head, the one movable for this purpose with at least one optical and / or photoelectric probe element equipped probe head is opposite, the invention consists • in that the probe head by means of notches opposite the distributor head is adjustable in fixed positions, such that the probe or elements arranged in the probe head in each Locking position of the Tastkojjfes the front ends of selected optical fibers face at a distance.

The surface surrounding the probe element, as well as the surface of the distributor head facing the probe head, is preferably anti-reflective. The probe element arranged in the probe head is in each latching position at the end of the selected optical fiber at a distance of at least 10 / µm, but not more than 100 / µm opposite. Through this inventive training of the Channel switch for an optical fiber arrangement, the above conditions are sufficiently met.

Due to the fact that the probe head is provided with notches_. and these notches correspond to the division of the optical fibers in the distribution head, is an exact positioning of the im Probe head arranged probe elements opposite the front ends the optical fibers possible. It is essential here that the probe element or elements be at an optimal distance from the front ends facing the optical fibers. On the one hand VPA 9/710/3134 509821/0595

the front ends of the preferably ground flat Optical fibers from the probe head or the probe elements are not "must be touched; on the other hand, however, a or low-loss signal transition are made possible. If the probe element is too far from the front end of the respective optical fiber removed, the attenuation also increases. To avoid damage to the ends of the optical fibers through contact to avoid, the distance 'should be at least 10 / um, but to Avoid excessive attenuation, should not be more than 100yum. If one takes into account that, depending on the type of material, the light exit angle emanating from the end of the optical fiber 30 to 110 degrees' is due to the existing, even if there is a small gap, there is a risk of the optical fibers or those on the optical fibers influencing one another given guided signals. However, this is made possible by an anti-reflective coating on the surfaces delimiting the gap and the Probe element surrounding surfaces avoided.

The optical fibers, which have only a small diameter of 0.1 to 0.2 mm, for example, are naturally quite sensitive. In order to avoid damage to the fibers in the manifold head, but also to ermögliohen to a sufficiently accurate pitch at the front end of the distributor head, the insertion end of the distribution head is equipped with arranged at a constant pitch of grooves in which the light directing ^x are fibers, by a protective jacket are dressed. Individual groups of tutes. can have incisions of different depths such that the optical fibers are in concentric circles at a constant pitch from one another at the end of the distributor head. However, there is also the possibility, for example in the case of a flat fiber optic cable, to arrange the optical fibers one above the other in several rows. The channel switch can be designed either as a sliding flat switch or as a rotary switch.

In the drawings are two on an enlarged scale Optical fiber channel switches formed in accordance with the invention

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-4-shown schematically with the associated details.

In Figures 1 to 4, a generally designated 1 channel switch is shown, the one by means of a Has handle 2 rotatable probe head 3. The bundle of optical fibers, for example in a pipe or hose, is on a distributor nozzle 4 'of the distributor head 4 is brought up; the individual optical fibers 5, 5 'etc. are - as in particular from the sectional drawing of FIG. 2 it can be seen - located in hats 6 and covered with a protective layer 52. These grooves are at a constant pitch angle t in the distributor nozzle 4 'incised. The distributor stub is connected to a distributor face plate 9 by means of screws 8; latter is provided with bores 10 through which the individual optical fibers 5 etc. passed and at their insertion end are fixed by means of an adhesive introduced into a fillet weld 11. As a connecting element of the distributor nozzle with A cylinder head screw is used for the fiber optic bundle7 (tube or hose) 13. The front plate of the distributor head is cut out in the shape of a plate, with the above probe head 3 protruding plate rim 14 a spring catch 15 is introduced. The end face 16 of the distributor plate is aligned flat, with the front ends 17 of the optical fibers preferably being ground are. There is a spacer between the end face 16 of the distributor head and the end face 18 of the probe head 19 arranged, which has a low thickness of at least 10 / um to a maximum of 100 / um. The probe is wearing here a pushbutton element 20, for example a phototransistor, which by means of a connection coupling 21 via a cable 22 with. a beer registration unit, not shown, e.g. an oscilloscope or a television set.

As is particularly apparent from Figure 4, the probe head 3 has on its peripberen surface 23 of detent notches 24, the pitch angle ^{"t! L} the pitch of the optical fibers in the header corresponds. Henceforth carries the probe a stop 25, which prevents over-rotation of the probe. A with the

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Handle 2 provided actuating shaft 26 is in connection with the probe head and protrudes through a central bore 27 of the distributor plate. Spring washers 28- ″ cause a sufficient Pressing the probe head against the spacer 19.

¥ ie can be seen in particular from Figure 3, has the Distribution plate, lateral planes 29 for attachment to a device part. There is a groove 30 in the stirrup plate of the manifold introduced into which the collar 31 of the probe head protrudes. This constructive training is intended to avoid that contaminants, e.g. dust, get into the narrow gap 32 between the distributor head plate and the probe head. A guide groove 33 is used to guide the stop 25 according to Figure 4. » each limited by the counter stop 34 on both sides is. * ■■. ,;

The end faces 16 and 18 according to Figures 3 and 4 are like shown hatched here at 16 'and 18' - in the critical area of the optical fiber ends and the probe element anti-reflective coating by blackening the material. «This makes one mutual influence of the individual optical fibers avoided. ;

In Figures 5 and 6, a manifold 4 'is shown, of the grooves 6 and 6 'opposite the manifold of Figure 1 having different depths. The arrangement is like this taken that at the end 35 of the support body, the optical fibers 5, 5 'etc. lie in concentric circles 51, 51' to one another. The pitch angle t is as for the inner one constant for the outer pitch circle. Correspondingly to this the probe elements are also arranged on the probe head.

In Figures 7 and 8 is a channel switch with a sliding Probe shown. The distributor head is here designed as a box-shaped housing 36 ·; he owns one Plate 36 »through which the optical fibers 5, 5 'etc. passed are. The optical fibers ^ are in an optical fiber

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band 37 formed. A shaft flanged to the housing 36 ' 38 holds the Lieh tie iterband on the distributor head. The one in the case 36 ′ guided probe head 39 carries two probe elements 40 here and 41, which are arranged at a pitch ■ t from one another. ■ The probe head is designed as a slide; it has a base plate 42 in which a spring catch 43 is inserted. One base plate 44 provided with locking notches 45 serves as a counter-lock for the spring lock 43; the distance between the individual notches from each other "is either t · or 2t a handle 46 or adjustable by means of the button 47 fastened thereon, shown here only in dashed lines. That Cable leading from the photodiodes 40, 41 is passed through a slot 49. A cover plate 53 protects the switch housing against ingress of contaminants. The buttons

or photodiodes 40 and 41 are here also at a distance from Front end 16 · of the distributor plate arranged. In the area of the photodiodes, the probe head has an anti-reflective surface Groove 50 provided, which prevents the front ends of the optical fibers come into contact with the probe head and through Mirroring a mutual influence takes place.

The base plate 44 or the housing 36 'can have connecting flanges 54 for attaching the channel switch to the device, not shown here.

The invention can be modified in many ways within the framework of the features mentioned and shown. This is how it is, for example possible to control the probe head by an automatic selector switch. Align the shape and design of the selector switch according to the intended use. The probe elements can be arranged next to one another or one above the other without this the scope of the invention is left.

8 claims
8 figures

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Claims (8)

Claims J Device for an optical fiber arrangement for the transmission of signals from one channel to another, consisting of a fiber optic distributor head which is opposite a probe head equipped with at least one optical and / or photoelectric probe element which is movable for this purpose, thereby geke η η ζ calibrated η et that the probe head (3; 39) can be adjusted in fixed positions by means of notches relative to the distributor head (4), such that the probe element or elements (20, 40, 41) arranged in the probe head is selected in each latching position of the probe head Optical fibers (5, 5 ^! ) Face each other at a distance (32). 2. Apparatus according to claim 1, characterized in that the probe element (20 or 40, 4I) surrounding surface (18 ¹ ) as well as the surface facing the probe head (3) - (16.V) of the distributor head (16) anti-reflective coating are. 3 · Device according to claims 1 and 2, characterized in that g e k e. η η draws that the distance (32) of the probe element (20) in each latching position from the front end (17) of the respective optical fibers (5, 5 ') is at least 10 / µm, but not more than 100 / µm. 4. Device according to claims 1 to 3 »characterized in that the probe element (20 or 40, 41) in one introduced into the end face (18) of the probe head (3) Cavity is held. 5. Device according to claims 1 to 4, characterized in that the distributor head (9) in the constant pitch (t) arranged grooves (6) in which the optical fibers (5, 5 ^f ) are located and surrounded by a protective jacket (52) are. . VPA 9 / 7IO / 3134 509821/0595 6. Apparatus according to claims 1 "to 5, characterized in that the end face (16) of the fiber optic ends having Y Teilerkopfes (9) is planarized, the preferably ground forehead eyes (17) of the optical fibers (5, 5 ')" flush with the end face of the divider head (4). 7. Device according to claims 1. to 6, characterized in that the probe head (3 or 39) with a
Handle (2 or 46) is equipped. 8. Device according to claims 1 to 7 »characterized in that the handle (2 or 47) has a pointer or is a scale handbabe. TPA 9/710/3134 509821/0595 Lee rs e i t e