DE7808787U1 - FIBER OPERATING DEVICE - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT Our reference: Berlin and Munich · VPA 78 6 6 5 8 O BRO

Optical fiber branching device

The innovation relates to a fiber optic branching device with one incoming and several outgoing optical fibers, with the outgoing and the incoming optical waveguide with end faces at a certain distance are arranged from each other and the axes of all optical waveguides directed at right angles to the end faces run in a plane in which also between the end face of the incoming and the end faces the outgoing light waveguide an optical intermediate medium is provided and essentially the End faces of the outgoing optical waveguides arranged directly adjacent to one another and symmetrically are distributed to the extended axis of the incoming optical fiber.

In wireline communications technology, instead of using over Wires of flowing alternating currents of fiber optic cables

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transported light is used as a means of communication. Here it is desirable, among other things, the light emitted via a fiber optic cable to be able to distribute signals to several other fiber optic cables with as little loss as possible.

The task of the innovation is therefore to develop a device of the type mentioned above so that with With the help of this device, a loss-free feed of the incoming fiber optic cable is possible incoming light signals can be made in several outgoing optical fibers.

Innovation According to the solution of this object \ 'j> results from the fact that the outgoing light waveguide arranged with the end face intersecting points of their axes at an equal distance from the end surface of intersection of the axis of the incoming optical waveguide and with their extended over the front faces addition axes on the end face intersection of the axis of the incoming optical waveguide are aligned. ·

In this way, the end faces of the outgoing optical waveguides are symmetrical to the axis of the incoming fiber optic cable positioned KreäDogen, because the individual end faces with their Axis intersections are tangential to a circle as points of contact, which is the end face axis intersection of the incoming fiber optic cable as the center Has. The light transported by the incoming fiber optic cable is not exactly parallel to the axis this optical waveguide-s from its end face off, but in a certain angular range symmetrical to the axis, which is caused by the so-called acceptance angle is determined. If you measure the radius of the circular arc, on the periphery of which the end faces of the

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giving optical waveguides are arranged, depending on the number of outgoing optical waveguides, i.e. depending on the extent of the circular arc, the is "occupied" by the end faces of the outgoing optical waveguide, it can be achieved that in ^ eden the outgoing optical waveguide Light components of the light transported via the incoming optical waveguide be radiated.

In a further embodiment of the innovation, a transparent material is provided as the intermediate medium, the has essentially the same refractive index as the optical waveguide.

In this way, optical joints between the end faces of the optical waveguides and are advantageous the intermediate medium avoided.

With such a fiber optic branching device it is then advantageously possible to measure the distance a between the end face intersections of the incoming Fiber optic cable and those of the outgoing fiber optic () waveguide can be derived from the following relationship:

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where χ is the number of outgoing optical waveguides', d is the diameter of an optical waveguide and oc indicates the acceptance angle of the optical waveguides used.

An embodiment of the innovation is shown below explained in more detail with reference to a figure, the figure showing the optical waveguide expansion device from above seen shows (in a schematic representation, under path

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- 4 - VPA 78 G 6 5 8 O BRD all details that are not absolutely necessary for understanding the innovation and enlarged) with sectional images attached on both sides along the sectional planes indicated in the figure. 5

In detail, it can be seen from the figure that the optical waveguide branching device is arranged as a substantially planar structure on a plate-shaped substrate 1. Here are the incoming Optical waveguide 2 and the outgoing optical waveguide 3 with end-side sections in a foil section 4 embedded, the one shown in the execution example has a rectangular outline and is fixed on the substrate 1. The end sections of the optical fibers Adapted film cutouts ensure the appropriate positioning of the optical waveguide end panels in the film section 4. The thickness of the film section 4 corresponds to the diameter d the optical waveguide 2 or 3. The film section 4 forms between the end faces 5 of the incoming light waveguide 2 and those of the outgoing Optical waveguide 3 a transparent optical intermediate medium, which by suitable selection of the film has the same refractive index as the optical waveguide itself. The substrate 1 on the underside of the Foil section 4 and a material surrounding the foil section 4 on its other side surfaces on the other hand, have such a refractive index that that from the end face 5 de; "incoming optical fiber 2, light exiting the film section 4 at right angles to the planar structure of the LichtwellenJeiter branching device can not leave.

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The end faces 5 of the outgoing optical waveguides are arranged so that they are opposite the end face 5a of the incoming optical waveguide 2 at a certain distance. The axes 6 of all Optical waveguides are located in the area of the optical waveguide branching device in one plane. In addition, the outgoing optical waveguides are aligned with their end sections so that the over the end faces 5 of these optical waveguides extended axes 6 to the intersection 8 of the axis aim with the end face 5a of the incoming optical waveguide 2. Here is the distance between each intersection 7 of the axis 6 of an outgoing optical waveguide with its end face 5 from The intersection point 8 of the axis 6 of the incoming optical waveguide 2 and its end face 5a are dimensioned to be the same size. This distance a is based on the assumption that the film section 4, the optical intermediate medium between the end faces of the incoming and outgoing the optical waveguide forms the same refractive index how the optical waveguide has to be determined so that that is below the acceptance angle <* - to the axis 6 from the end face 5a of the incoming optical waveguide emerging light over the end faces 5 of the two

² ^ outermost outgoing optical waveguide 3 is radiated into this, ie the distance a is to be dimensioned so that, depending on the number χ of the outgoing optical waveguides from their end faces 5 a symmetrical to the over the end face 5a addition ver elongated axis 6 of the incoming optical fiber running circular arc is occupied, which corresponds to the angle 2ei is equivalent to. This results in the design rule for a

_a "

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- 6 - VPA 78 G 6 5 8 O RO where χ is the Ατι number of outgoing optical waveguides and d is the diameter of these optical waveguides and λ indicates the acceptance angle. The acceptance angle is the critical angle below the one
Optical waveguides can still be transported essentially without loss of light. For example, the value for a is 1.27 mm if 5 outgoing optical waveguides are provided and the optical waveguides are one

Have a diameter of 0.1mm and the acceptance 10

angle is 9 °.

3 claims for protection
1 figure

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Claims (3)

j - 1 - VPA 78 G 6 5 8 O BRD protection claims. 1. Optical waveguide branching device with one incoming and several outgoing optical waveguides, ] 5 in which the outgoing and incoming optical waveguides are arranged with end faces at a certain distance from one another and the axes of all optical waveguides directed at right angles to the end faces run in one plane in which In addition, Q 10, an optical intermediate medium is provided between the end face of the incoming and the end face of the outgoing optical waveguide and essentially the end faces of the outgoing optical waveguide are arranged directly adjacent to one another and are distributed symmetrically to the extended axis of the incoming optical waveguide, characterized in that the outgoing optical waveguides ( 3) with the end face intersections (7) of their axes (6) at the same distance from the end face clmitt point (8) of the axis (6) of the incoming optical waveguide (2) and with their over forehead-, . surfaces (5) also extended axes on the end face intersection (δ) of the axis (6) of the incoming optical fiber (3) are aligned. 25th 2. Optical fiber branching device according to claim 1, characterized in that that a transparent material is provided as the intermediate medium (4), which is essentially the same Refractive index, as the optical waveguide has. 7808787 07/06/78 -2- VPA 78G6580BRO 3. Optical waveguide branching device according to claim 2, characterized in that that the distance a between the end face intersections of the incoming optical waveguide (2) and those of the outgoing fiber optic cable (3) is derived from the following condition: _ ~ (x-1) d . % £
^a V OC where χ is the number of outgoing optical fibers, Q d is the diameter of an optical waveguide and oc the acceptance angle of the optical waveguide used indicates. 7808787 07/06/78