Device for digital data transmission via a waveguide optical network

p0001The invention relates to an arrangement for transmitting digital data over an existing from optical waveguides optical network, wherein the optical waveguide forming at their junctions passive nodes which cause a division of the data transmitted in the form of light data in the merged optical waveguide.

p0002The transmission of digital data representing light signals over an optical medium is known. The topology of these networks, ie the doctrine of the position and arrangement of such geometric figures in space, is mostly done from point to point. In the case of long transmission paths exchanger or amplifiers are used to amplify the light signals in the arrangements described above.

p0003An alternative is the ring architecture of an optical network, wherein each node in an existing signal from digital data is regenerated before it is transmitted to the next node. Such arrangements, because of the amplifier to be used and active nodes at substantially higher cost compared to an initially described busbar topology with passive nodes.

p0004A bus topology is only possible with a reduced number of passive nodes, because in a passive node of two optical waveguides about 50% of a fiber optic transmitted data is distributed to the other optical waveguide. Thus, according to this hub about the same light output is transmitted in the two optical waveguides. This fact is apparent from Fig. 1, where a passive Y-junction is shown.

p0005The invention is therefore based on the object to provide an arrangement of the type mentioned, with the improvement of the transmitted optical power and therefore a substantially increased number of passive nodes is made possible in an optical network.

p0006The object is achieved in that the nodes each having at the entrance of an associated optical waveguide coupling surfaces to a maximum precisely defined reflection of light and thus to transfer a maximum light output to a subsequent node and for separating a defined minimum light output for with coupling surfaces provided optical waveguides of the individual nodes perform.

p0007An essential advantage of the invention is to be seen in that the arrangement for the transfer of digital data without the use of any of these amplifiers is realized.

p0008Two embodiments of the invention are that either a visually-optically formed node or an optical-electrical-trained node is provided.

p0009According to a development of the invention is attached to a coupling surface of an optically-optically formed a junction a smooth surface and a prism structure having Direction coupling body yet. The invention is characterized in that the smooth surface of the coupling body to the shows the maximum light output transmitting optical waveguide and the prism structure in the direction of the separated defined minimum optical power receiving optical waveguide.

p0010A further embodiment of the invention is that an optical coupling body is used with a downstream optical coupler as an optically-electrically trained node.

p0011According to the invention arranged at the nodes of the coupling body may be made of polycarbonate and / or each have lens systems.

p0012In the drawing, embodiments of the invention are shown schematically. Show it:<dl id="dl0001"><dt>Fig. 1:</dt><dd>a passive Y-junction according to the prior art;</dd><dt>Fig. 2:</dt><dd>an optical-optical node designed with a coupling surface;</dd><dt>Fig. 3:</dt><dd>. A provided with a coupling body hub according to FIG 2, wherein the coupling body is increased in a section is shown;</dd><dt>Fig. 4:</dt><dd>the coupling body shown in Figure 3 with enlarged illustrated prismatic structure. and</dd><dt>Fig. 5:</dt><dd>an optical-electrical constructed node.</dd></dl>

p0013From Fig. 1 it is seen that the optical fibers 1 and 2 are brought together at a passive Y-junction the third At this juncture the information transmitted in the optical waveguide 1 and in the form of light particles (photons) is split light output symbolically represented. As already mentioned, thus about 50% of the transmitted in the optical waveguide 1 light output to the optical waveguide 2 is delivered to the node. 3

p0014By in Fig. 2 represented optical-optical node 4, a significant improvement in performance is made possible. This node includes a specially designed coupling surface 5, which is arranged in the immediate vicinity of the merged optical waveguide 1 and 2. FIG. The coupling surface 5 is formed so that a precisely defined maximum reflection of the light is obtained at the node. There is thus transmitted in the optical waveguide 1, a maximum light output to a subsequent node, during a defined minimum optical power is coupled into the coupling surface 5 is provided with the optical waveguide second

p0015In FIGS. 3 and 4, a coupling body 6 and 8, arranged on the coupling face 5 each. The coupling body has a smooth and a surface provided with a prism structure. Here, the smooth surface 7 and 9 shows the coupling body 6 and 8 at which the maximum light output transmitting optical fiber 1 and the prism structure 10 in the direction of the separated defined minimum optical power receiving optical waveguide second

p0016Fig. 5 shows an example of an optical-electrical formed hub 11 consisting of an optical coupling body 12 and an opto-coupler 13 arrangement.

p0017The components are arranged in the immediate vicinity of the node in the optical waveguide 2, wherein the coupling body 12 to the optical waveguide 1 is closest. This coupling body can - just like the coupling body 6 and 8 described above - be made of polycarbonate. In addition, the coupling body can be equipped with not graphically illustrated lens systems. This is a realization of a larger dimension of the nodes is possible.

p0018With the coupling bodies to improve the transmitted light power initially described is achieved due to physical laws of optics. While in the embodiment according to the prior art, at each successive node shown in FIG. 1 approximately 50% of the transmitted light power are separated, it is possible, for example, with the technology of the present invention to separate only 2% of the data transmitted in an optical fiber light output. In the example it is assumed that 0.8% of the source light power is required in a system to detect a signal. A comparison of this example with the prior art shown in the following table.<tables id="tabl0001" num="0001"><table frame="all"><tgroup cols="3" colsep="1" rowsep="0"><colspec colnum="1" colname="col1" colwidth="52.50mm" /><colspec colnum="2" colname="col2" colwidth="52.50mm" /><colspec colnum="3" colname="col3" colwidth="52.50mm" /><thead valign="top"><row><entry namest="col1" nameend="col1" rowsep="0" align="center">Nearest number</entry><entry namest="col2" nameend="col3" align="center">separated light output [%]</entry></row><row><entry namest="col1" nameend="col1" /><entry namest="col2" nameend="col2" align="center">State of the art</entry><entry namest="col3" nameend="col3" align="center">invention</entry></row></thead><tbody valign="top"><row><entry namest="col1" nameend="col1" align="right">1</entry><entry namest="col2" nameend="col2" align="right">50.00%</entry><entry namest="col3" nameend="col3" align="left">2.00%</entry></row><row><entry namest="col1" nameend="col1" align="right">2</entry><entry namest="col2" nameend="col2" align="right">25.00%</entry><entry namest="col3" nameend="col3" align="left">1.96%</entry></row><row><entry namest="col1" nameend="col1" align="right">3</entry><entry namest="col2" nameend="col2" align="right">12.50%</entry><entry namest="col3" nameend="col3" align="left">1.92%</entry></row><row><entry namest="col1" nameend="col1" align="right">4</entry><entry namest="col2" nameend="col2" align="right">6.25%</entry><entry namest="col3" nameend="col3" align="left">1.88%</entry></row><row><entry namest="col1" nameend="col1" align="right">5</entry><entry namest="col2" nameend="col2" align="right">3.13%</entry><entry namest="col3" nameend="col3" align="left">1.84%</entry></row><row><entry namest="col1" nameend="col1" align="right">6</entry><entry namest="col2" nameend="col2" align="right">1.56%</entry><entry namest="col3" nameend="col3" align="left">1.80%</entry></row><row><entry namest="col1" nameend="col1" align="right">7</entry><entry namest="col2" nameend="col2" align="right">0.78%</entry><entry namest="col3" nameend="col3" align="left">1.76%</entry></row><row><entry namest="col1" nameend="col1" align="right">8th</entry><entry namest="col2" nameend="col2" align="right">...</entry><entry namest="col3" nameend="col3" align="left">1.72%</entry></row><row><entry namest="col1" nameend="col1" align="right">,</entry><entry namest="col2" nameend="col2" align="right">...</entry><entry namest="col3" nameend="col3" align="left">...</entry></row><row><entry namest="col1" nameend="col1" align="right">30</entry><entry namest="col2" nameend="col2" align="right">...</entry><entry namest="col3" nameend="col3" align="left">0.84%</entry></row><row><entry namest="col1" nameend="col1" align="right">31</entry><entry namest="col2" nameend="col2" align="right">...</entry><entry namest="col3" nameend="col3" align="left">0.80%</entry></row></tbody></tgroup></table></tables>

p0019From the table it can be seen that with the previously existing technology, a series connection of a maximum of 7 nodes is possible, while the inventive technology enables a series connection of a total of 31 nodes.

p0020Assuming in another example, assume that at each node only 1% of the source light power is coupled out and 0.4% are sufficient to detect the data, so the ratio of the maximum cascaded node 8 is to 61st

LIST OF REFERENCE NUMBERS

p0021<dl id="dl0002" compact="compact"><dt>1</dt><dd>optical fiber</dd><dt>2</dt><dd>optical fiber</dd><dt>3</dt><dd>passive node</dd><dt>4</dt><dd>optical-optical node</dd><dt>5</dt><dd>coupling surface</dd><dt>6</dt><dd>coupling body</dd><dt>7</dt><dd>smooth surface of the coupling body 6</dd><dt>8th</dt><dd>coupling body</dd><dt>9</dt><dd>smooth surface of the coupling body 8</dd><dt>10</dt><dd>Prismatic structure of the coupling body 6 or 8</dd><dt>11</dt><dd>optical-electrical node</dd><dt>12</dt><dd>optical coupling body</dd><dt>13</dt><dd>Opto-couplers</dd></dl>