• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Compact optical multiplexer (1) comprising: first input guides (21a, 22a, 23a) oriented towards a first diffraction grating mirror (3a), and a first output guide (41a) that receives a light signal reflected by said first mirror (3a) of diffraction grating, where the first guides (21a, 22a, 23a) and the first guide (41a) are arranged on a first circle (5a) of Rowland; second input guides (21b, 22b, 23b) oriented towards a second diffraction grating mirror (3b) and a second output guide (41b) receiving a light signal reflected by said second diffraction grating mirror (3b) , wherein the second guides (21b, 22b, 23b) and the second guide (41b) are arranged on a second circle (5b) of Rowland; where the first circle (5a) and second circles (5b) of Rowland overlap at least partially. A similar demultiplexer (1 ') is also defined. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2684177A1
    申请号:ES201730463
    申请日:2017-03-29
    公开日:2018-10-01
    发明作者:Guillermo CARPINTERO DEL BARRIO；Luis Jorge ORBE NAVA
    申请人:Universidad Carlos III de Madrid；
    IPC主号:
    专利说明:

    Multiplexer and compact optical demultiplexer with high number of channels OBJECT OF THE INVENTION
    The present invention pertains in general to the field of devices used in optical communications and spectroscopy sensors.
    The object of the present invention is a novel multiplexing and optical demultiplexing device whose main advantage is a greatly reduced size in relation to current equivalent devices. BACKGROUND OF THE INVENTION
    Fiber optic communications consist of the transmission of information through light signals sent through fiber optics. Each wavelength that is injected into the fiber constitutes a communication channel, whose transmission speed is limited by the bandwidth of the devices. In order to increase the transmission speed, it is usual to inject multiple wavelengths into the fiber. On the other hand, spectroscopy techniques are based on spectral analysis, detecting differences in the absorption of electromagnetic radiation at different wavelengths.
    In this field, devices are required that allow the handling of wavelengths, among which are multiplexers and optical demultiplexers. Figs. 1a and 1b show two generic schemes of a multiplexer and a demultiplexer. In a multiplexer (Fig. 1a), a number of input guides (or channels) are combined in a single output guide, while in a de-multiplexer (Fig. 1b) the reverse operation is performed, separating signals that coexist in a single entry guide in different exit guides.
    There are currently various types of optical multiplexers / demultiplexers, such as Array Waveguide Grating (AWG) devices, diffraction grating devices, and Y-junction devices in Y-junction. cascade, multiplexers in Y-multiple (“forks”), or Mach-Zender type devices. However, they all have the significant disadvantage that they increase the size of the device excessively as the number of channels increases, so that it becomes impractically large for integration into a Photonic Integrated Circuit (PIC).
    Fig. 2a shows a multiplexer (100) based on diffraction networks consisting of several input guides (114) and an output guide (112). The light signal of each of the input guides (114) has a different wavelength (λ1, λ2, λ3, ..., λn). As is known in this field, the inlet (114) and outlet (112) guides are arranged along a circle known as the Rowland circle. In a position tangent to the Rowland circle, a mirror is arranged based on a diffraction network, which has the quality of reflecting wavelengths in different spatial directions. With an appropriate design, light signals with different wavelengths introduced by different input guides (114) can be reflected towards a single output guide (112). Since all the signals introduced by the input guides (114) are reflected in the same direction towards the output guide (112), in this one a light signal is formed where each of the signals introduced by the input guides overlap (114), functioning as a multiplexer.
    Fig. 2b shows a demultiplexer based on a diffraction network with a configuration equivalent to that of the previous multiplexer. This demultiplexer consists of an input guide (112) and several output guides (114). All guides (112, 114) are located along the circumference of Rowland. The light signal introduced through the input guide (112) has a plurality of superimposed wavelengths (λ1, λ2, λ3,…, λn). When this light input signal is reflected in the mirror with diffraction network, it is broken down into a plurality of light signals of different wavelengths emitted in different directions and corresponding to the positions of the output guides (114). Therefore, this device allows to break down an input signal into several output signals of different wavelengths.
    The article "Mid-infrared wavelength multiplexer in InGaAs / InP waveguides using a Rowland circle grating", by Gilles et al, Optics Express, Vol 23, Issue 16, pp 20288-20296, 2015 describes such a demultiplexer. Patent documents US 8462338, US 2016018595, and US 9369201 also describe examples of mirror-based multiplexers and demultiplexers a diffraction network.
    As previously mentioned, a major drawback of this type of device is its large size. For reasons of space, there is a maximum number of channels that a single multiplexer / demultiplexer can support. Therefore, to increase the number of channels of a multiplexer / demultiplexer it is also necessary to increase the diameter of the Rowland circle on which they are implemented. Alternatively, to increase the number of channels of a multiplexer / demultiplexer it is possible to arrange two or more of these devices in parallel. That is, two or more individual submultiplexers / demultiplexers can be arranged next to each other, so that the total space occupied would be double or more than the space occupied by each individual submultiplexer / demultiplexer. Note that, in the context of the design of PICs for optical telecommunications applications, size is a critical factor.
    As an example, Fig. 3 shows an enlarged image of such a multiplexer integrated in an Integrated Photonic Circuit (PIC). This multiplexer has 15 input channels and 5 output channels. It can be seen how the surface occupied by the Rowland circle is empty of any additional element, constituting a free propagation zone for electromagnetic radiation. This area consumes a large amount of surface in the PIC.
    In addition, this type of multiplexers / demultiplexers have another drawback related to crosstalk between channels. Indeed, the optical signals transmitted through the plurality of input guides (114) in a multiplexer and the plurality of guides
    (114) output on a demultiplexer actually correspond to different wavelength bands. For example, as shown in Fig. 4, the wavelength bands can be (∆λ1, ∆λ2, ∆λ3, ∆λ4, ∆λ5). In the current multiplexers / demultiplexers formed by a single diffraction network mirror, being these input or output guides (114) arranged next to each other, an undesired crosstalk can occur between adjacent channels. This crosstalk is due to the physical proximity between channels destined for adjacent wavelengths in the spectrum. In this situation, a small part of the light signal destined for a channel can enter the immediately adjacent channels. If the wavelength bands of these channels overlap at the ends, this crosstalk could affect causing interference. Therefore, the selectivity of this type of multiplexers / demultiplexers is negatively affected. Furthermore, although this can be minimized by increasing the selectivity of the filter, this also contributes to increasing the size of the multiplexing / demultiplexing device. DESCRIPTION OF THE INVENTION
    The present invention solves the above problems thanks to a novel multiplexer / demultiplexer formed by the superposition of several submultiplexers / demultiplexers of the type described. That is, each sub-multiplexer / demultiplexer will have their respective input guides, output guides, and corresponding diffraction network mirror, but the respective Rowland circles of both will overlap at least partially. Thus, to obtain a multiplexer / demultiplexer with a certain total number of input / output channels, several sub-multiplexers are used that share at least partially the free propagation area (i.e., the Rowland circles are at least partially overlapped) and each of which has a smaller number of input / output guides that, added together, result in the total number of the multiplexer / demultiplexer.
    An important advantage of this configuration is that the space occupied by the new multiplexer / demultiplexer is greatly reduced. In an extreme case, the Rowland circles of the sub-multiplexers / demultiplexers completely overlap, that is, they share a Rowland circle, thus obtaining maximum space savings: the space occupied by the entire multiplexer / demultiplexer is equal to the space occupied by each of the sub-multiplexers / demultiplexers that comprise it. Another advantage of this configuration is that nearby wavelength input / output channels can be arranged in physically separate multiplexer / demultiplexer input / output guides. This allows to increase the selectivity of the multiplexer / demultiplexer and decrease the crosstalk.
    A first aspect of the present invention is directed to a new multiplexer that essentially comprises at least the following elements:
    a) First sub-multiplexer
    This first sub-multiplexer comprises a first input waveguide comprising a plurality of first adjacent input guides whose ends are oriented towards a first diffraction network mirror, and a first output waveguide comprising at least a first output guide whose end is arranged to receive a light signal reflected by said first diffraction network mirror from a plurality of light signals emitted by said plurality of first input guides. In addition, as is customary in this type of device, the ends of the plurality of first entry guides and the end of the first exit guide are arranged on a first Rowland circle.
    b) Second sub-multiplexer This second sub-multiplexer comprises a second input waveguide comprising a plurality of adjacent second input guides whose ends are oriented towards a second diffraction network mirror and a second output waveguide that it comprises at least a second output guide whose end is arranged to receive a light signal reflected by said second diffraction network mirror from a plurality of light signals emitted by said plurality of second input guides. In addition, as is customary in this type of device, the ends of the plurality of second input guides and the end of the second exit guide are arranged on a second Rowland circle.
    This novel multiplexer has the particularity that the first Rowland circle of the first sub-multiplexer and the second Rowland circle of the second sub-multiplexer at least partially overlap. This new configuration discovered by the inventors of the present application makes it possible to achieve significant space savings in multiplexers formed by at least two sub-multiplexers, thus allowing multiplexing a greater number of input guides in the same space. Note that, although the simplest configuration of a multiplexer consisting of two sub-multiplexers is described here, it would be possible to superimpose a larger number of sub-multiplexers according to each particular application. This would allow the designer to choose the size of each of the multiplexer devices based on the number of input or output channels and the number of devices needed.
    Indeed, as mentioned above, until now when it was necessary to implement a multiplexer from several sub-multiplexers, these were arranged in parallel next to each other. That is, each individual sub-multiplexer was physically separated and completely independent of the rest of the sub-multiplexers, so that the space occupied by a multiplexer consisting of n sub-multiplexers was at least n times greater than the volume of a sub- individual multiplexer In the present invention, since the sub-multiplexers of the present invention are at least partially superimposed, a greater space saving is achieved, the greater the area common to the Rowland circles of the sub-multiplexers.
    According to an especially preferred embodiment of the invention, the first Rowland circle and the second Rowland circle completely overlap. Thus, the possible space saving is achieved by sharing at least two sub-multiplexers in the same Rowland circle.
    On the other hand, a multiplexer according to the present invention can be configured in different ways depending on the relative position of the input and output guides of the respective sub-multiplexers. This configuration can be selected according to each particular application as long as the positions that the corresponding diffraction network mirrors of each sub-multiplexer must occupy in each case do not interfere with each other.
    For example, according to a preferred embodiment of the invention, the ends of the plurality of first input guides and the end of the first output guide of the first sub-multiplexer are located in positions adjacent to the ends of the plurality of second input guides and the end of the second output guide of the second submultiplexer. With this configuration, the input and output guides of the first and second submultiplexers are located close to each other, so it is easy to connect them to implement a single multiplexer for all purposes.
    In another example, the ends of the plurality of first input guides and the end of the first output guide of the first sub-multiplexer are located in opposite positions to the ends of the plurality of second input guides and the end of the second output guide of the second sub-multiplexer. With this configuration, the input and output guides of the first and second sub-multiplexers are far from each other, thus the multiplexer can be used as two independent sub-multiplexers with inputs and outputs located in different positions.
    A further advantage of the present invention is the greater selectivity of a multiplexer formed by several sub-multiplexers that share at least a part of the surface of the respective Rowland circles. In fact, when the input light signals are introduced into the multiplexer through at least two input waveguides that can be physically separated from each other, it is possible to distribute the light signals of nearby wavelengths into input guides that are as far apart as possible. For example, in a preferred embodiment of the invention, luminous signals of adjacent wavelengths are arranged in non-contiguous input guides. More preferably, luminous signals of adjacent wavelengths are arranged are alternatively arranged in input guides belonging to different waveguides. This makes it possible to significantly increase the selectivity of the multiplexer.
    A second aspect of the present invention is directed to a new demultiplexer configured in accordance with the same principles as the previous multiplexer, and therefore has the same advantages. All explanations and descriptions made with reference to the previous multiplexer are equally valid for this demultiplexer except when the context clearly indicates otherwise.
    The demultiplexer of the invention essentially comprises at least the following elements:
    a) First sub-demultiplexer
    The first demultiplexer comprises a first input waveguide comprising at least a first input guide whose end is oriented towards a first diffraction network mirror, and a first output waveguide comprising a first plurality of output guides adjacent whose ends are arranged to receive light signals reflected by said first diffraction network mirror from a light signal emitted by said first input guide. In addition, as is customary in this type of device, the end of the first entry guide and the ends of the plurality of first exit guides are arranged on a first Rowland circle.
    b) Second demultiplexer
    The second sub-demultiplexer comprises a second input waveguide comprising at least a second input guide whose end is oriented towards a second diffraction net mirror, and a second output waveguide comprising a second plurality of output guides adjacent whose ends are arranged to receive light signals reflected by said second diffraction network mirror from a light signal emitted by said second input guide. In addition, as is customary in this type of device, the end of the entry guide and the ends of the plurality of second exit guides are arranged on a second Rowland circle.
    Like the previous multiplexer, this novel demultiplexer has the peculiarity that the first Rowland circle of the first sub-demultiplexer and the second Rowland circle of the second sub-demultiplexer are at least partially overlapped. More preferably, the first Rowland circle and the second Rowland circle overlap completely. This results in significant space savings in relation to the usual arrangement of two or more sub-demultiplexers in parallel.
    The demultiplexer of the invention can be configured in different ways depending on the relative position of the input and output guides of the respective sub-multiplexers. For example, in a preferred embodiment of the invention the end of the input guide and the ends of the plurality of first exit guides of the first sub-multiplexer are located in positions adjacent to the end of the second input guide and to the ends of the plurality of second output guides of the second demultiplexer. In another preferred embodiment of the invention, the end of the input guide and the ends of the plurality of first exit guides of the first sub-demultiplexer are located in positions opposite the end of the second input guide and the ends of the plurality of second output guides of the second sub-demultiplexer.
    A further advantage of the present invention is the greater selectivity of a demultiplexer formed by several sub-demultiplexers that share at least a part of the surface of the respective Rowland circles. In fact, when the luminous output signals of the demultiplexer are extracted through at least two output waveguides that can be physically separated from each other, it is possible to distribute the light signals of nearby wavelengths into output guides that are as separate as possible. In a preferred embodiment, luminous signals of adjacent wavelengths are arranged in non-contiguous output guides. In an even more preferred embodiment, light signals of adjacent wavelengths are alternatively arranged in output guides located on different waveguides. This makes it possible to significantly increase the selectivity of the demultiplexer. BRIEF DESCRIPTION OF THE FIGURES
    Figs. 1a and 1b respectively show a generic scheme of a multiplexer and a demultiplexer.
    Figs. 2a and 2b respectively show a multiplexer and a demultiplexer of the diffraction grating type.
    Fig. 3 shows a microscope image of a multiplexer with 15 input channels and 5 output channels.
    Fig. 4 shows a schematic image of the arrangement of the wavelengths of the light signals introduced through several adjacent input guides in a multiplexer according to the prior art.
    Fig. 5 shows an example of a multiplexer according to the present invention formed by two sub-multiplexers whose Rowland circles are partially overlapping.
    Fig. 6 shows another example of a multiplexer according to the present invention formed by two sub-multiplexers sharing Rowland's circle.
    Fig. 7 shows an example of a demultiplexer according to the present invention formed by two sub-demultiplexers whose Rowland circles are partially overlapping.
    Fig. 8 shows another example of demultiplexer according to the present invention formed by two sub-demultiplexers that share Rowland's circle.
    Figs. 9a-9d show various examples of multiplexers / demultiplexers according to the invention.
    Fig. 10 shows an example of the arrangement of the light signals in the input guides of a multiplexer according to the invention so that adjacent wavelength signals are arranged separately in different waveguides. PREFERRED EMBODIMENT OF THE INVENTION
    A particular example according to the present invention is described below with reference to Figs. 5 onwards, showing various embodiments of multiplexers / demultiplexers (1, 1 ’) according to the present invention.
    Fig. 5 shows an example of a multiplexer (1) formed by two sub-multiplexers (1a, 1b) implemented in two respective Rowland circles (5a, 5b) that partially overlap. In this particular example, sub-multiplexers (1a, 1b) have both three inputs and one output, although it should be understood that any other combination is possible. In addition, it is not necessary that the first sub-multiplexer (1a) be the same as the second submultiplexer (1b).
    The first sub-multiplexer (1a) has an input waveguide (2a) that conducts three input guides (21a, 22a, 23a) whose ends are located on the corresponding Rowland circle (5a) and oriented towards a mirror ( 3a) diffraction grating. The light signals transmitted through the waveguide (2a), which have the wavelengths (∆λ1, ∆λ3, ∆λ5), affect the mirror (3a) diffraction grating. In a known manner, the result of the reflection is a single signal in which the three incoming light signals are superimposed and directed towards one end of an output guide (41a) conducted in an output waveguide (4a).
    Similarly, the second sub-multiplexer (1b) has an input waveguide (2b) that conducts three input guides (21b, 22b, 23b) whose ends are located on the corresponding Rowland circle (5b) and oriented towards a mirror (3b) diffraction grating. The light signals transmitted through the waveguide (2b), which have the wavelengths (∆λ2, ∆λ4, ∆λ6), affect the mirror (3b) diffraction grating. In a known manner, the result of the reflection is a single signal in which the three incoming light signals are superimposed and which is directed towards one end of an output guide (41b) conducted in an output waveguide (4b).
    Since the two Rowland circles (5a, 5b) of the respective sub-multiplexers (1a, 1b) are partially superimposed, it is evident that a space saving is obtained in relation to the conventional configuration in which the two sub- would be arranged multiplexers (1a, 1b) completely separated from each other. In addition, it is possible to distribute the input light signals in the multiplexer (1) so that those having contiguous wavelengths are in different wavelengths (2a, 2b) and physically separated. In this example, the light signals with wavelength bands denoted here with odd numbers are transmitted through the input waveguide (2a) of the first submultiplexer (1a) and the light signals with wavelength bands denoted here even numbers are transmitted through the input waveguide (2b) of the second sub-mutiplexer (1b). This can either reduce the size of the multiplexer device, relaxing the diffraction network selectivity, or decrease the probability of crosstalk between channels, thereby improving the selectivity of the multiplexer (1).
    Fig. 6 also shows a multiplexer (1) formed by two sub-multiplexers (1a, 1b) according to the present invention, although in this case the respective Rowland circles (5a, 5b) completely overlap. This configuration allows to achieve the maximum possible space savings.
    Fig. 7 shows an example of a demultiplexer (1 ’) formed by two sub-demultiplexers (1’a, 1’b) implemented in two respective Rowland circles (5’a, 5’b) that partially overlap. In this specific example, sub-demultiplexers (1’a, 1’b) both have one input and three outputs, although it should be understood that any other combination is possible. In addition, it is not necessary that the first sub-demultiplexer (1’a) be the same as the second sub-demultiplexer (1’b).
    The first sub-demultiplexer (1'a) has an input waveguide (2'a) that drives an input guide (21'a) whose end is located on the corresponding and oriented Rowland circle (5'a) towards a mirror (3'a) diffraction grating. The light signal transmitted through the waveguide (2’a) affects the mirror (3a) diffraction grating. In a known manner, the result of the reflection is the decomposition of the light signal into three wavelength signals (∆λ1, ∆λ3, ∆λ5) respectively directed to the ends of the output guides (41'a, 42 ' a, 43'a) conducted in the output waveguide (4'a).
    Similarly, the second sub-demultiplexer (1'b) has an input waveguide (2'b) that drives an input guide (21'b) whose end is located on the Rowland circle (5'b ) corresponding and oriented towards a mirror (3'b) diffraction grating. The light signal transmitted through the waveguide (2’b) affects the mirror (3b) diffraction grating. In a known manner, the result of the reflection is the decomposition of the light signal into three wavelength signals (∆λ2, ∆λ4, ∆λ6) respectively directed to the ends of the output guides (41'b, 42 ' b, 43'b) conducted in the output waveguide (4'b).
    Therefore, in a manner equivalent to that described above in relation to the multiplexer (1), the partial overlapping of the two Rowland circles (5a, 5b) of the respective sub-multiplexers (1a, 1b) allows space savings in relation to the conventional configuration in which the two sub-demultiplexers (1a, 1b) would be completely separated from each other. In addition, also in a manner similar to that described in relation to the multiplexer (1), it is possible to distribute the output luminous signals of the demultiplexer (1) so that those having contiguous wavelengths are in waveguides (2'a, 2 'b) different. In this case, the light signals with wavelength bands denoted here with odd numbers are transmitted through the output waveguide (4'a) of the first sub-demultiplexer (1'a) and the light signals with bands Wavelengths denoted here with even numbers are transmitted through the output waveguide (4'b) of the second sub-demutiplexer (1'b). Therefore, it is possible to reduce the probability of crosstalk between channels, thereby improving the selectivity of the demultiplexer (1 ’).
    Figs. 9a-9d show various possible configurations of a multiplexer (1) / demultiplexer (1 ’) according to the relative position of the respective input and output guides.
    Fig. 9a shows an example where the Rowland circles (5) overlap completely and where the input and output guides of the sub-multiplexers (1a, 1b) / subdemultiplexers (1'a, 1'b) are arranged in almost diametrically opposite positions.
    Fig. 9b shows an example where the Rowland circles (5) partially overlap and where the input and output guides of the first sub-multiplexer (1st) / subdemultiplexer (1b) are arranged in separate positions but oriented in similar directions although slightly divergent.
    Fig. 9c shows an example where the Rowland circles (5) partially overlap and where the input and output guides of the sub-multiplexers (1a, 1b) / subdemultiplexers (1'a, 1'b) are arranged in contiguous and oriented positions according to similar but slightly divergent directions.
    Fig. 9d shows an example where the Rowland circles (5) partially overlap and where the input and output guides of the sub-multiplexers (1a, 1b) / subdemultiplexers (1'a, 1'b) are arranged in contiguous and oriented positions according to similar but slightly convergent directions.
    Fig. 10 schematically shows the relationship between the wavelength bands of the light signals transmitted in a multiplexer (1) / demultiplexer (1) according to the present invention through the respective guides of each sub-multiplexer (1) / sub -demultiplexer (1 ') that constitute it. As mentioned above, adjacent light signals are arranged in separate input or output guides, so that the probability of crosstalk occurring is minimized. This is clear when comparing Fig. 10 with Fig. 4 which shows the situation in the multiplexers (1) / demultiplexers (1 ’) of the prior art. Striped bands indicate areas where crosstalk can occur between channels if the input or output guides in question are located too close to each other.
    权利要求:
    Claims (10)
    [1]
    1. Compact optical multiplexer (1) of high number of channels comprising:
    - a first input waveguide (2a) comprising a plurality of adjacent first input guides (21a, 22a, 23a) whose ends are oriented towards a first mirror (3a) of diffraction network, and a first guide (4a) output wave comprising at least a first output guide (41a) whose end is arranged to receive a light signal reflected by said first diffraction network mirror (3a) from a plurality of light signals emitted by said plurality of first entry guides (21a, 22a, 23a) and, where the ends of the plurality of first entry guides (21a, 22a, 23a) and the end of the first exit guide (41a) are arranged on a first circle ( 5a) of Rowland;
    - a second input waveguide (2b) comprising a plurality of adjacent second input guides (21b, 22b, 23b) whose ends are oriented towards a second diffraction net mirror (3b) and a second guide (4b) of output wave comprising at least a second output guide (41b) whose end is arranged to receive a light signal reflected by said second diffraction network mirror (3b) from a plurality of light signals emitted by said plurality of seconds input guides (21b, 22b, 23b) and, where the ends of the plurality of second input guides (21b, 22b, 23b) and the end of the second output guide (41b) are arranged on a second circle (5b ) from Rowland;
    characterized in that - the first circle (5a) of Rowland and the second circle (5b) of Rowland overlap at least partially.
    [2]
    2. Optical multiplexer (1) according to claim 1, wherein the first circle (5a) of Rowland and the second circle (5b) of Rowland completely overlap.
    [3]
    3. Optical multiplexer (1) according to any one of the preceding claims, wherein the ends of the plurality of first input guides (21a, 22a, 23a) and the end of the first output guide (41a) are located in positions adjacent to the ends of the plurality of second input guides (21b, 22b, 23b) and the end of the second output guide (41b).
    [4]
    Four. Optical multiplexer (1) according to any one of claims 1-2, wherein the ends of the plurality of first input guides (21a, 22a, 23a) and the end of the first output guide (41a) are located in positions opposite to the ends of the
    plurality of second input guides (21b, 22b, 23b) and the end of the second output guide (41b).
    [5]
    5. Optical multiplexer (1) according to any of the preceding claims, wherein luminous signals of adjacent wavelengths are arranged in non-contiguous input guides (21a, 22a, 23a, 21b, 22b, 23b).
    [6]
    6. Optical multiplexer (1) according to claim 5, wherein luminous signals of adjacent wavelengths are alternatively arranged in input guides (21a, 22a, 23a, 21b, 22b, 23b) belonging to guides (2a, 2b) of different wave.
    [7]
    7. Compact optical demultiplexer (1 ’) with a high number of channels comprising:
    - a first input waveguide (2'a) comprising at least a first input guide (21'a) whose end is oriented towards a first mirror (3'a) diffraction grating, and a first guide (4'a ) an output wave comprising a first plurality of adjacent output guides (41'a, 42'a, 43'a) whose ends are arranged to receive light signals reflected by said first mirror (3'a) diffraction grating a starting from a light signal emitted by said first input guide (21'a), and where the end of the first input guide (21'a) and the ends of the plurality of first guides (41'a, 42'a , 43'a) of exit are arranged on a first circle (5'a) of Rowland;
    - a second input waveguide (2'b) comprising at least a second input guide (21'b) whose end is oriented towards a second mirror (3'b) diffraction grating, and a second guide (4'b ) an output wave comprising a second plurality of adjacent output guides (41'b, 42'b, 43'b) whose ends are arranged to receive light signals reflected by said second mirror (3'b) diffraction grating a starting from a light signal emitted by said second input guide (21'b), and where the end of the input guide (21'b) and the ends of the plurality of second guides (41'b, 42'b, 42'b) of exit are arranged on a second circle (5'b) of Rowland;
    characterized in that -the first circle (5’a) of Rowland and the second circle (5’b) of Rowland overlap at least partially.
    [8]
    8. Optical demultiplexer (1 ’) according to claim 7, wherein the first circle (5a) of Rowland and the second circle (5b) of Rowland completely overlap.
    [9]
    9. Optical demultiplexer (1 ’) according to any of claims 7-8, wherein the end of the input guide (21’a) and the ends of the plurality of first guides (41’a,
    42'a, 43'a) of exit are located in positions adjacent to the end of the second inlet guide (21'b) and to the ends of the plurality of second guides (41'b, 42'b, 43'b) output
    10. Optical demultiplexer (1 ') according to any of claims 7-8, wherein the end of the input guide (21'a) and the ends of the plurality of first guides (41'a, 42'a , 43'a) of exit are located in opposite positions to the end of the second input guide (21'b) and to the ends of the plurality of second guides (41'b, 42'b, 43'b) of exit.
    [11]
    11. Optical demultiplexer (1 ') according to any of claims 7-10, wherein luminous signals of adjacent wavelengths are arranged in guides (41'a, 42'a, 43'a, 41'b, 42' b, 43'b) output not contiguous.
    12. Optical demultiplexer (1 ') according to claim 11, wherein luminous signals of adjacent wavelengths are alternatively arranged in guides (41'a, 42'a, 43'a, 41'b, 42' b, 43'b) output belonging to different waveguides (4'a, 4'b).
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    同族专利:
    公开号 | 公开日
    ES2684177B1|2019-07-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN104914509A|2015-06-29|2015-09-16|西安交通大学|Double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer|
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