CN115712171A - Optical add drop multiplexer - Google Patents

Optical add drop multiplexer Download PDF

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Publication number
CN115712171A
CN115712171A CN202110968203.XA CN202110968203A CN115712171A CN 115712171 A CN115712171 A CN 115712171A CN 202110968203 A CN202110968203 A CN 202110968203A CN 115712171 A CN115712171 A CN 115712171A
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CN
China
Prior art keywords
light
output
input
assembly
wavelength
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CN202110968203.XA
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Chinese (zh)
Inventor
乔雨
赵臻青
欧阳奎
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202110968203.XA priority Critical patent/CN115712171A/en
Priority to PCT/CN2022/108683 priority patent/WO2023024819A1/en
Publication of CN115712171A publication Critical patent/CN115712171A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/27—Optical coupling means with polarisation selective and adjusting means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Abstract

The application provides an optical add-drop multiplexer, which belongs to the technical field of optical communication. The optical add-drop multiplexer comprises an input assembly, a filtering diaphragm, an output assembly and a transmission loopback assembly. In the process of adjusting the lower wave wavelength or the upper wave wavelength to the target wavelength, the input assembly receives first input light, adjusts the incident angle of the output light of the first input light incident to the filtering diaphragm, and the transmission loopback assembly receives the transmission light of the output light of the first input light on the filtering diaphragm and outputs the transmission light to the output assembly. The output assembly receives the reflected light and the transmitted light of the output light of the first input light on the filtering membrane and directly outputs the reflected light and the transmitted light. Therefore, the lower wave wavelength or the upper wave wavelength can be automatically adjusted, and in the process of adjusting the lower wave wavelength or the upper wave wavelength, the reflected light and the transmitted light of the input light on the filter membrane can be directly output, so that the loss of the input light can be reduced.

Description

Optical add drop multiplexer
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to an optical add/drop multiplexer.
Background
As county-rural wavelength division demands increase, resulting in the metro core aggregation network sinking, optical add/drop multiplexers need to be used. An optical add/drop multiplexer is an optical wavelength division multiplexing device that can add or drop single wavelength light to or from multiple wavelength light.
In the related art, a fixed optical add/drop multiplexer is generally used, in which a single wavelength light can be fixedly dropped or added. Therefore, when the wavelength of the outgoing light or the wavelength of the incoming light is adjusted, the optical fiber needs to be manually plugged and pulled for operation, so that the optical add/drop multiplexer has poor flexibility.
Disclosure of Invention
The application provides an optical add-drop multiplexer, can change the light of separating out automatically or add into the light for optical add-drop multiplexer is more nimble.
In a first aspect, the present application provides an optical add/drop multiplexer that includes an input assembly, a filter diaphragm, a transmissive loopback assembly, and an output assembly. And the input assembly is used for receiving first input light and adjusting the incident angle of the output light of the first input light incident to the filtering diaphragm in the process of adjusting the lower wave wavelength or the upper wave wavelength to the target wavelength. And the transmission loopback component is used for receiving first transmission light of the output light of the first input light on the filtering diaphragm and outputting the first transmission light to the output component. And the output assembly is used for receiving first reflected light and first transmitted light of the output light of the first input light on the filtering diaphragm and directly outputting the first reflected light and the first transmitted light.
According to the scheme, the lower wavelength or the upper wavelength of the optical add-drop multiplexer is adjusted by adjusting the incident angle of the first input light incident to the filter diaphragm. In the process of adjusting the lower wavelength or the upper wavelength of the optical add-drop multiplexer to the target wavelength, the reflected light and the transmitted light of the first input light on the filter membrane can be directly output, and the first input light cannot be lost. Therefore, the lower wavelength or the upper wavelength can be automatically adjusted, and in the process of adjusting the lower wavelength or the upper wavelength, the reflected light and the transmitted light of the input light on the filter membrane can be directly output, so that the loss of the input light can be reduced.
In a possible implementation manner, the optical add/drop multiplexer is a wavelength division device, and after adjusting the incident angle to a target value corresponding to the target wavelength, the optical add/drop multiplexer transmits the loopback component to receive the second transmission light of the output light of the first input light on the filter membrane and transmit and output the second transmission light. And the output assembly is used for receiving second reflected light of the output light of the first input light on the filtering diaphragm and directly outputting the second reflected light.
According to the scheme, when the optical add-drop multiplexer is used as a wavelength division device, after the incident angle is adjusted to the target value corresponding to the target wavelength, the first input light is incident to the filter diaphragm, and the filter diaphragm transmits the light with the target wavelength. The transmission loopback component transmits the light with the target wavelength and outputs the light to realize the down wave. The output assembly outputs the output light of the first input light in a straight-through manner through the reflected light of the filtering diaphragm. Thus, the optical add/drop multiplexer implements the drop function.
In a possible implementation manner, the optical add/drop multiplexer is a multiplexer, and after adjusting the incident angle to a target value corresponding to the target wavelength, the optical add/drop multiplexer transmits the loopback component to receive the second input light, and the second input light is incident to the filter membrane according to the incident angle as the target value, and the wavelength of the second input light is the target wavelength; and the output assembly is used for receiving second reflected light of the output light of the first input light on the filtering diaphragm and third transmitted light of the second input light on the filtering diaphragm, and carrying out through output on the second reflected light and the third transmitted light.
According to the scheme, when the optical add-drop multiplexer is used as a wave combining device, after the incident angle is adjusted to the target value corresponding to the target wavelength, first input light is incident to the filter diaphragm, the filter diaphragm transmits light of the target wavelength, the first input light does not include light of the target wavelength, and the first input light is incident to the filter diaphragm and then does not have transmission light. The transmission loopback component enables the upwave input light (namely the second input light) to be incident to the filtering diaphragm according to the incidence angle as a target numerical value, and transmission of the second input light on the filtering diaphragm is achieved. The output assembly directly outputs the reflected light of the output light of the first input light on the filtering diaphragm and the transmitted light of the second input light on the filtering diaphragm. Thus, the optical add/drop multiplexer realizes the function of wave-up.
In a possible implementation manner, the input assembly includes a first movable mirror, and in the process of adjusting the lower wavelength or the upper wavelength to the target wavelength, the first movable mirror is configured to receive the first input light, and adjust an incident angle at which the output light of the first input light is incident to the filter membrane by rotating; after the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable reflector is used for receiving the first input light and making the output light of the first input light incident to the filter diaphragm. Thus, the movable mirror can adjust the incident angle by rotating, and the control can be simplified.
In one possible implementation, the input assembly further comprises a first fixed mirror; the first movable reflector is arranged on a light path between the first fixed reflector and the filter membrane; the first fixed reflector is used for receiving the first input light and reflecting the first input light to the first movable reflector. Therefore, the transmission direction of the first input light can be changed through the first fixed reflecting mirror, and the size of the optical add/drop multiplexer can be smaller.
In one possible implementation, the output assembly includes a second movable mirror; the second movable reflector is used for receiving the first reflected light and the first transmitted light and outputting the first reflected light and the first transmitted light in a straight-through manner through rotation in the process of adjusting the lower wavelength to the target wavelength; and after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector is used for receiving the second reflected light and directly outputting the second reflected light. Thus, the movable reflector can realize the through output of the optical add/drop multiplexer through rotation, and the control can be simple and convenient.
In one possible implementation, the output assembly further comprises a second fixed mirror, the second fixed mirror being configured to: the light reflected by the second movable mirror is output in a straight-through manner. In this way, the transmission direction of the light reflected by the second movable mirror can be changed by the second fixed mirror, and the optical add/drop multiplexer can be made smaller in size.
In one possible implementation, the transmissive loopback assembly includes a third movable mirror and a fourth movable mirror; the third movable reflector and the fourth movable reflector are used for receiving the first transmitted light and outputting the first transmitted light to the output component through rotation in the process of adjusting the lower wavelength to the target wavelength; and the third movable reflector is used for receiving the second transmitted light and transmitting and outputting the second transmitted light through rotation after the incident angle is adjusted to a target value corresponding to the target wavelength.
According to the scheme, under the condition that the optical add-drop multiplexer is a wavelength division device, in the process of adjusting the lower wavelength of the optical add-drop multiplexer, the movable reflecting mirror can directly output the transmitted light through rotation, and the control is simple and convenient. And after the lower wavelength of the optical add-drop multiplexer is adjusted to the target wavelength, the first input light is incident to the filter diaphragm according to the incident angle of the target value, and the filter diaphragm transmits the light with the target wavelength in the first input light. The third movable mirror transmits and outputs light of a target wavelength by rotating. Thus, when the wavelength of the optical add/drop multiplexer is adjusted to the target wavelength, the light of the target wavelength can be subjected to the wavelength dropping process.
In one possible implementation, the optical add/drop multiplexer is a wavelength division device, the input module includes a first polarization beam splitting module, the output module includes a first polarization beam combining module, and the transmission loopback module includes a second polarization beam combining module. And the first polarization beam splitting component is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the filtering diaphragm to form single polarization light. And the first polarization beam combination component is used for carrying out polarization beam combination on the light which is output through the first polarization beam combination component and is output through the second polarization beam combination component to form dual-polarization light. And the second polarization beam combination component is used for carrying out polarization beam combination on the light transmitted and output into dual-polarization light before the light is transmitted and output.
According to the scheme, when the optical add-drop multiplexer is a wavelength division device, the first polarization beam splitting assembly converts the first input light into the single polarized light, and the single polarized light is incident to the filtering diaphragm, so that the first input light is identical to the optical filtering bandwidth of the same wavelength when passing through the filtering diaphragm. Finally, when the straight-through output is carried out, the single polarized light is converted into the polarized combined light (also called dual polarized light) through the first polarized beam combining component, so that the straight-through output light is the polarized combined light. And finally, when transmission output is carried out, the single polarized light is converted into polarized combined light through the second polarized beam combining component, so that the transmitted and output light is the polarized combined light.
In one possible implementation, the optical add/drop multiplexer further includes a first movable half-wave plate disposed on the optical path between the filtering diaphragm and the first polarization beam splitting assembly. And the first movable half-wave plate is used for changing the polarization state of the first input light after polarization beam splitting through rotation. In this way, the polarization state of the single polarized light after the first input light is subjected to polarization splitting can be continuously changed through the first movable half-wave plate, and the filtering bandwidth of the single polarized light on the filtering diaphragm can be continuously changed.
In a possible implementation manner, the output assembly includes a second movable reflecting mirror, and in the process of adjusting the upper-wave wavelength to the target wavelength, the second movable reflecting mirror is used for receiving the first reflected light and the first transmitted light and carrying out through output on the first reflected light and the first transmitted light through rotation. And the second movable reflector is used for receiving the second reflected light and the third transmitted light and outputting the second reflected light and the third transmitted light in a straight-through manner after the incident angle is adjusted to a target value corresponding to the target wavelength. Thus, the movable reflector can realize the through output of the optical add/drop multiplexer through rotation, and the control can be simple and convenient.
In one possible implementation, the transmission loopback module comprises a third movable mirror and a fourth movable mirror, and the third movable mirror and the fourth movable mirror are used for receiving the first transmission light and outputting the first transmission light to the output module through rotation in the process of adjusting the upper wavelength to the target wavelength. And after the incident angle is adjusted to a target value corresponding to the target wavelength, the third movable reflector is used for receiving second input light and enabling the second input light to be incident to the filter membrane according to the incident angle serving as the target value.
According to the scheme, under the condition that the optical add-drop multiplexer is a wave combination device, in the process of adjusting the wavelength of the upper wave of the optical add-drop multiplexer, the movable reflecting mirror can directly output the transmitted light through rotation, and the control is simple and convenient. And when the incident angle is adjusted to a target value, the wavelength of the upper wave of the optical add-drop multiplexer is adjusted to a target wavelength, and the wavelength of the second input light is the target wavelength. And controlling the third movable reflector to rotate, inputting the light with the target wavelength to the filter diaphragm, and transmitting the light with the target wavelength through the filter diaphragm. Thus, when the wavelength of the add/drop multiplexer is adjusted to the target wavelength, the add can be realized.
In one possible implementation, the input component includes a first polarization beam splitting component, the output component includes a first polarization beam combining component, and the transmissive loopback component includes a second polarization beam splitting component. The first polarization beam splitting component is used for carrying out polarization beam splitting on the first input light before the first input light enters the filtering membrane to be changed into single polarization light. And the second polarization beam splitting component is used for carrying out polarization beam splitting on the second input light before the second input light enters the filtering film to be converted into single polarization light. The first polarization beam combining component is used for carrying out polarization beam combination on the light output by the filtering membrane to obtain dual-polarization light before outputting.
In the scheme shown in the application, when the optical add/drop multiplexer is a wave combination device. The second polarization beam splitting assembly converts the second input light into single polarized light, and the single polarized light is incident to the filtering diaphragm, so that the filtering bandwidths of the second input light for the light with the same wavelength are the same when the second input light passes through the filtering diaphragm. And finally, when the straight-through output is carried out, the single polarized light is converted into the polarized beam combining light through the first polarized beam combining component, so that the straight-through output light is the polarized beam combining light.
In one possible implementation, the optical add/drop multiplexer further includes a second movable half-wave plate disposed on the optical path between the filtering diaphragm and the second polarization beam splitting assembly. And the second movable half-wave plate is used for changing the polarization state of the second input light after polarization beam splitting through rotation.
According to the scheme, the second movable half-wave plate can continuously change the polarization state of the single polarized light of the second input light after polarization beam splitting through rotation, and then the filtering bandwidth of the single polarized light on the filtering membrane can be continuously changed.
In a second aspect, the present application provides an optical add/drop multiplexer comprising a first input assembly, a fully inverted diaphragm, at least one first filtering diaphragm, and a first output assembly; the filter bandwidth of each first filter diaphragm is different; the first input assembly is used for receiving first input light, and adjusting the incident angle of the output light of the first input light incident to the total reflection diaphragm in the process of adjusting the lower wave wavelength or the upper wave wavelength to the target wavelength; after the incident angle is adjusted to a target value corresponding to the target wavelength, the target filtering diaphragm in the at least one first filtering diaphragm moves into an output light path of the first input assembly, and the total reflection diaphragm moves out of the output light path of the first input assembly; the first filtering diaphragm is used for transmitting light with a target wavelength in the output light of the first input light; the first output assembly is used for outputting the light output by the total reflection diaphragm and the target filtering diaphragm.
The scheme shown in the application adjusts the lower wavelength or the upper wavelength of the optical add-drop multiplexer by adjusting the incident angle of the first input light to the spliced membrane. In the process of adjusting the lower wavelength or the upper wavelength of the optical add-drop multiplexer to the target wavelength, the total reflection diaphragm is arranged on the output light path of the first input assembly, the first input light is totally reflected on the total reflection diaphragm to carry out through output, and the first input light is not lost. When the incident angle is adjusted to a target value, the first filter diaphragm moves into the output light path of the first input assembly, and the total reflection diaphragm moves out of the output light path of the first input assembly, so that light with a target wavelength can be transmitted and output to realize a down wave function, or light with the target wavelength can be input in an up wave mode to realize an up wave function. Therefore, the lower wavelength or the upper wavelength can be automatically adjusted, and the input light is directly output in the process of adjusting the lower wavelength or the upper wavelength, so that the loss of the input light can be reduced.
In one possible implementation, the optical add/drop multiplexer is a wavelength division device, and the first input assembly includes a first movable mirror. And in the process of adjusting the lower wavelength to the target wavelength, the first movable reflector is used for receiving the first input light and adjusting the incident angle of the output light of the first input light to the total reflection membrane through rotation. After the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable reflector is used for receiving the first input light and making the output light of the first input light incident to the target filtering diaphragm. Thus, the movable mirror can adjust the incident angle by rotating, and the control can be simplified.
In a possible implementation manner, the first input assembly further includes a first fixed mirror, the first movable mirror is disposed on a light path between the first fixed mirror and the splicing membrane, and the first fixed mirror is configured to reflect the first input light to the first movable mirror. Therefore, the transmission direction of the first input light can be changed through the first fixed reflecting mirror, and the size of the optical add/drop multiplexer can be smaller.
In one possible implementation, the first output component includes a first sub-output component and a second sub-output component. And the first sub-output assembly is used for carrying out through output on the reflected light output by the total reflection diaphragm in the process of adjusting the down wave wavelength to the target wavelength. After the incident angle is adjusted to a target value corresponding to the target wavelength, the first sub-output assembly is used for directly outputting the reflected light output by the target filtering diaphragm, and the second sub-output assembly is used for transmitting and outputting the transmitted light output by the target filtering diaphragm. Therefore, when the optical add-drop multiplexer is a wave-division device, the first sub-output assembly can realize through output, and the second sub-output assembly can realize transmission output.
In one possible implementation, the first sub-output assembly includes a second movable mirror. And a second movable reflector for outputting the reflected light output from the total reflection diaphragm through rotation in the process of adjusting the down wavelength to the target wavelength. And after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector is used for directly outputting the reflected light output by the target filter membrane. Thus, the movable reflector can realize the through output of the optical add/drop multiplexer through rotation, and the control can be simple and convenient.
In one possible implementation, the second sub-output assembly includes a third movable mirror. And after the incident angle is adjusted to a target value corresponding to the target wavelength, the third movable reflector is used for transmitting and outputting the transmitted light output by the target filter membrane through rotation. Thus, the movable mirror can realize transmission output by rotating, and the control can be simplified.
In one possible implementation, the first input assembly includes a first polarization beam splitting assembly, the first sub-output assembly includes a first polarization beam combining assembly, and the second sub-output assembly includes a second polarization beam combining assembly. And the first polarization beam splitting component is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the target filtering film sheet to obtain single polarization light. And the first polarization beam combining component is used for carrying out polarization beam combination on the reflected light output by the target filtering diaphragm before the reflected light is directly output to be dual-polarization light. And the second polarization beam combining component is used for carrying out polarization beam combination on the transmission light output by the target filtering membrane to change the transmission light into dual-polarization light before transmission output.
According to the scheme, when the optical add-drop multiplexer is a wavelength division device, the first polarization beam splitting assembly converts first input light into single polarized light, and the single polarized light is incident to the filtering diaphragm, so that the optical filtering bandwidth of the first input light with the same wavelength is the same when the first input light passes through the filtering diaphragm. And finally, when the straight-through output is carried out, the single polarized light is converted into the polarized combined light through the first polarized beam combining component, so that the straight-through output light is the polarized combined light. And finally, when transmission output is carried out, the single polarized light is converted into the polarized beam combination light through the second polarized beam combination component, so that the light output by transmission is the polarized beam combination light.
In one possible implementation, the optical add/drop multiplexer is a wave combiner, and the first input module includes a first sub-input module and a second sub-input module. In the process of adjusting the upper wavelength to the target wavelength, the first sub-input assembly is used for receiving first input light and adjusting the incident angle of the output light of the first input light incident to the total reflection diaphragm. After the incident angle is adjusted to a target value corresponding to the target wavelength, the first sub-input assembly is used for receiving first input light and inputting output light of the first input light to the target filtering diaphragm, the second sub-input assembly is used for receiving second input light and inputting output light of the second input light to the target filtering diaphragm by taking the incident angle as the target value, and the wavelength of the second input light is the target wavelength.
According to the scheme, when the optical add-drop multiplexer is a wave combination device, the first sub-input assembly can achieve through input, and the second sub-input assembly can achieve wave output.
In one possible implementation, the first sub-input assembly includes a first movable mirror. And the first movable reflector is used for adjusting the incidence angle of the output light of the first input light to the total reflection membrane through rotation. After the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable reflector is used for receiving the first input light and making the output light of the first input light incident to the target filter diaphragm. Thus, the movable mirror can adjust the incident angle by rotating, and the control can be simplified.
In one possible implementation, the second sub-input assembly includes a third movable mirror. And the third movable reflector is used for receiving the second input light, and enabling the output light of the second input light to be incident to the target filtering diaphragm according to the incident angle as a target value through rotation. Thus, the movable mirror can control the incident angle by rotating, and the control can be simplified.
In one possible implementation, the first output assembly includes a second movable mirror. And the second movable reflector is used for directly outputting the reflected light output by the total reflection diaphragm through rotation in the process of adjusting the upper wave wavelength to the target wavelength. And after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector is used for directly outputting the reflected light and the transmitted light output by the target filter membrane. Thus, the through output in the combined wave can be realized by the movable mirror, and the control can be simplified.
In one possible implementation, the first sub-input assembly includes a first polarization beam splitting assembly, the second sub-input assembly includes a second polarization beam splitting assembly, and the first output assembly includes a first polarization beam combining assembly. The first polarization beam splitting component is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the target filtering film sheet so as to change the first input light into single polarization light. And the second polarization beam splitting component is used for carrying out polarization beam splitting on the second input light before the second input light is incident to the target filtering film sheet to be changed into single polarization light. And the first polarization beam combination component is used for carrying out polarization beam combination on the directly output light to obtain dual-polarization light before outputting.
In the scheme shown in the application, when the optical add-drop multiplexer is a wave-combining device, the second polarization beam splitting assembly converts the second input light into the single polarized light, and the single polarized light is incident to the filtering diaphragm, so that the second input light has the same optical filtering bandwidth for the same wavelength when passing through the filtering diaphragm. And finally, when the straight-through output is carried out, the single polarized light is converted into the polarized combined light through the first polarized beam combining component, so that the straight-through output light is the polarized combined light.
Drawings
FIG. 1 is a graphical representation of transmitted wavelength versus angle of incidence provided by an exemplary embodiment of the present application;
FIG. 2 is a schematic diagram of a filter membrane according to an exemplary embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 4 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 6 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 7 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 8 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 9 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 10 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
FIG. 11 is a schematic diagram of a polarization beam splitting assembly provided by an exemplary embodiment of the present application;
FIG. 12 is a schematic diagram of a polarization beam combiner assembly provided in an exemplary embodiment of the present application;
fig. 13 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength multiplexing device according to an exemplary embodiment of the present application;
fig. 14 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength multiplexing device according to an exemplary embodiment of the present application;
fig. 15 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength multiplexing device according to an exemplary embodiment of the present application;
fig. 16 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength multiplexing device according to an exemplary embodiment of the present application;
fig. 17 is a schematic structural diagram of an optical add/drop multiplexer as a wave combiner according to an exemplary embodiment of the present application;
fig. 18 is a schematic structural diagram of an optical add/drop multiplexer as a wave combiner according to an exemplary embodiment of the present application;
fig. 19 is a schematic structural diagram of an optical add/drop multiplexer as a wave combiner according to an exemplary embodiment of the present application;
fig. 20 is a schematic structural diagram of an optical add/drop multiplexer as a wave combiner according to an exemplary embodiment of the present application;
fig. 21 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 22 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 23 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 24 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 25 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 26 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength division device according to an exemplary embodiment of the present application;
fig. 27 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength multiplexing device according to an exemplary embodiment of the present application;
fig. 28 is a schematic structural diagram of an optical add/drop multiplexer as a wavelength multiplexing device according to an exemplary embodiment of the present application;
fig. 29 is a schematic structural diagram of an optical add/drop multiplexer as a wave combiner according to an exemplary embodiment of the present application;
fig. 30 is a schematic structural diagram of an optical add/drop multiplexer as a wave combiner according to an exemplary embodiment of the present application;
FIG. 31 is a graph of rotation angle of a movable half-wave plate versus filter bandwidth provided by an exemplary embodiment of the present application.
Description of the figures
11. An input component; 12 a filtering diaphragm; 13. a transmission loopback component; 14. an output component; 15. a first movable half-wave plate; 16. a second movable half-wave plate; 111. a first movable mirror; 112. a first fixed mirror; 113. a first polarization beam splitting assembly; 114. a lens; 131. a third movable mirror; 132. a fourth movable mirror; 133. a second polarization beam combining component; 134. a second polarization beam splitting assembly; 135. a third fixed mirror; 136. a fourth fixed mirror; 137. a fifth fixed mirror; 141. a second movable mirror; 142. a first polarization beam combining component; 143. a second fixed mirror; 21. a first input assembly; 22. a total reflection diaphragm; 23. a first filter diaphragm; 24. a first output assembly; 211. a first sub-input component; 212. a second sub-input assembly; 241. a first sub-output assembly; 242. and a second sub-output assembly.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
To facilitate understanding of the embodiments of the present application, the following first introduces some concepts of the terms involved for explanation:
1. an optical add/drop multiplexer is an optical wavelength division multiplexing device which can separate single wavelength light from multiple wavelength light or add single wavelength light into multiple wavelength light.
2. The filtering diaphragm is a diaphragm with different incident angles so that transmission wavelengths are different, namely, each transmission wavelength corresponds to one incident angle. The incident angle is the angle at which light is incident on the filter membrane. Fig. 1 shows the transmission wavelength of the filter membrane as a function of the angle of incidence. In fig. 1, the horizontal axis represents the incident angle, and the vertical axis represents the transmission wavelength. The solid-line curve and the dashed-line curve in fig. 1 represent the transmission wavelength versus the angle of incidence for the two filter diaphragms, respectively.
Fig. 2 also shows the structure of the filter diaphragm, which includes a filter surface, which may also be referred to as a reflection surface, a glass substrate, and an anti-reflection surface, which may also be referred to as a transmission surface. The function of the filter surface is to allow light of a certain wavelength to pass through while allowing light of other wavelengths to reflect, and the function of the antireflection surface is to allow light of various wavelengths to transmit. The upper surface of the glass substrate is alternately plated with a plurality of layers of filtering surfaces, and the lower surface of the glass substrate is plated with an anti-reflection surface.
The structure shown in fig. 2 is only one possible structure, and any diaphragm for realizing the function of the filter diaphragm provided in the embodiment of the present application can be applied to the embodiment of the present application. The filter diaphragms shown in fig. 2 are the filter diaphragm 12 and the first filter diaphragm 23 mentioned later.
3. The movable reflector is a rotatable reflector in the light path. Illustratively, the movable mirror is implemented by fixing a micro-electro-mechanical system (MEMS) mirror, and the fixing manner may be bonding or the like. Illustratively, the movable mirror may also be implemented using a liquid crystal on silicon (LCoS), which is a display technology using an active-matrix reflective liquid crystal.
In the embodiments of the present application, the change of the transmission direction of light in the light transmission plane can be controlled by controlling the rotation of the movable mirror.
4. The fixed reflector is a non-rotatable reflector in the light path.
5. The movable half-wave plate is a half-wave plate with an adjustable optical axis. Illustratively, the movable half-wave plate is realized by fixing the half-wave plate with the MEMS, and the fixing mode can be pasting or the like.
The concept of the present application is described below.
In the related art, a fixed optical add/drop multiplexer is generally used, in which a single wavelength light can be fixedly dropped or added. Thus, when adjusting the wavelength of the split light (which may be referred to as a lower wavelength) or the wavelength of the add light (which may be referred to as an upper wavelength), the optical fiber needs to be manually inserted and pulled for operation, which results in poor flexibility of the optical add/drop multiplexer.
In this application, through the incident angle's of input light incidence to the filtering diaphragm change, change the transmission wavelength of input light at the filtering diaphragm, and then can realize that automatic adjustment descends the ripples wavelength and goes up ripples wavelength. In the incident angle changing process, the reflected light and the transmitted light of the input light on the filtering diaphragm are directly output, so that the input light is not lost. Or the transmission wavelength of the input light on the filter diaphragm is changed by changing the incident angle of the input light to the filter diaphragm, so that the lower wave wavelength and the upper wave wavelength can be automatically adjusted. In the incident angle changing process, input light is incident to the total reflection diaphragm instead of the filtering diaphragm, and the total reflection diaphragm totally reflects the input light to be directly output, so that the input light cannot be lost.
Application scenarios of embodiments of the present application are described below. The optical add/drop multiplexer in the embodiment of the present application can be applied to a scene of light add/drop, that is, a lower wave scene or an upper wave scene. The method can be applied to county and county wavelength division scenes and metropolitan access network scenes.
The embodiments of the present application relate to an optical add/drop multiplexer based on two principles, as briefly described below.
A first principle optical add/drop multiplexer: when the optical add/drop multiplexer is used as a wavelength division device, the straight-through input light is incident to the filter membrane before the incident angle is adjusted to a target value (i.e. in the incident angle changing process), and the straight-through input light (hereinafter referred to as first input light) is subjected to straight-through output both in reflected light and transmitted light of the filter membrane without loss of the straight-through input light, wherein the incident angle is the incident angle of the straight-through input light on the filter membrane. After the incident angle is changed to a target value, the incident angle of the straight-through input light on the filtering membrane is the target value, the transmission light of the straight-through input light on the filtering membrane is light with a lower wave wavelength, the reflected light of the straight-through input light on the filtering membrane is light except the light with the lower wave wavelength, the reflected light of the straight-through input light on the filtering membrane is subjected to straight-through output, the transmission light of the straight-through input light on the filtering membrane is subjected to transmission output, and the lower wave function of the wave splitter is achieved.
When the optical add-drop multiplexer is used as a wave-combining device, the straight-through input light is incident to the filtering diaphragm before the incident angle is adjusted to a target value, the reflected light and the transmitted light of the straight-through input light on the filtering diaphragm are both subjected to straight-through output, and the straight-through input light cannot be lost. After the incident angle is changed to the target value, the through input light does not transmit through the filter membrane because the through input light does not include light with the wavelength corresponding to the target value. The direct output is carried out on the reflected light of the direct input light on the filtering diaphragm, the upper wave input light (hereinafter referred to as second input light, the wavelength of the second input light is upper wave wavelength) is incident to the filtering diaphragm according to the incidence angle as a target numerical value, the upper wave input light is not reflected on the filtering diaphragm, the direct output is carried out on the upper wave input light on the transmission light of the filtering diaphragm, and the upper wave function of the wave combining device is realized.
The optical add/drop multiplexer of the second principle: when the optical add/drop multiplexer is used as a wavelength division device, before the incident angle is adjusted to a target value (namely, in the incident angle changing process), the total reflection diaphragm is moved into the optical path, so that the straight-through input light is incident to the total reflection diaphragm, the incident angle of the straight-through input light on the total reflection diaphragm is adjusted, and the reflected light of the straight-through input light on the total reflection diaphragm is directly output. After the incident angle is changed to a target value, the total reflection diaphragm is moved out of the light path, and the filter diaphragm is moved into the light path, so that the incident angle of the straight-through input light on the filter diaphragm is also the target value. The transmitted light of the straight-through input light at the filtering diaphragm is light with a lower wave wavelength, the reflected light of the straight-through input light at the filtering diaphragm is light except the light with the lower wave wavelength, the reflected light of the straight-through input light at the filtering diaphragm is subjected to straight-through output, the transmitted light of the straight-through input light at the filtering diaphragm is subjected to transmission output, and the lower wave function of the wave splitter is realized.
When the optical add-drop multiplexer is used as a wave-combining device, before the incident angle is adjusted to a target value, the total reflection diaphragm is moved into the optical path, so that the straight-through input light is incident to the total reflection diaphragm, the incident angle of the straight-through input light on the total reflection diaphragm is adjusted, and the reflected light of the straight-through input light on the total reflection diaphragm is subjected to straight-through output. After the incident angle is changed to a target value, the total reflection diaphragm is moved out of the light path, and the filter diaphragm is moved into the light path, so that the incident angle of the straight-through input light on the filter diaphragm is also the target value. And because the through input light does not include the light with the wavelength corresponding to the target value, the through input light is not transmitted through the filtering diaphragm. The direct input light is directly output in reflected light of the filter diaphragm, the upper wave input light is incident into the filter diaphragm according to an incidence angle serving as a target value, the upper wave input light is not reflected by the filter diaphragm, the upper wave input light is directly output in transmitted light of the filter diaphragm, and the upper wave function of the wave combining device is achieved.
The optical add/drop multiplexer of the first principle is described below.
The optical add/drop multiplexer comprises an input module 11, a filter membrane 12, a transmissive loopback module 13 and an output module 14.
Illustratively, the input module 11, the transmission loopback module 13 and the output module 14 cooperate with each other to implement the function of an optical add/drop multiplexer. When the input module 11, the transmission loopback module 13 and the output module 14 are matched with each other, the input module, the transmission loopback module and the output module are independently controlled according to a certain rule. For example, the input module 11, the transmission loopback module 13 and the output module 14 periodically execute preset logic respectively, and the mutual matching is realized. Alternatively, the control is performed by a control unit when they are coordinated with each other.
Illustratively, the control component is integrated with either the input assembly 11, the transmissive loopback assembly 13, or the output assembly 14. For example, the control part is provided inside the input module 11 as a separate controller, or in the first movable mirror 111 included in the input module 11. Alternatively, the control unit is an independent device inside the optical add/drop multiplexer, such as a Central Processing Unit (CPU), a chip, a field-programmable gate array (FPGA), a Complex Programmable Logic Device (CPLD), a Micro Controller Unit (MCU), and the like. Alternatively, the control means is a controller external to the optical add/drop multiplexer.
The control component is respectively connected with the input component 11, the output component 14 and the transmission loopback component 13. Illustratively, the connection may be an electrical connection. In the embodiment of the present application, the control of the input module 11, the transmissive loopback module 13, and the output module 14 by the control unit is taken as an example for explanation.
The structure of the optical add/drop multiplexer as a wavelength division device will be described first.
The optical add/drop multiplexer includes a pass-through input, a pass-through output, and a transmission output. The through input end, the through output end and the transmission output end are respectively connected with optical fibers. The through input end is used for inputting first input light, and the first input light is input light transmitted by other equipment. The through output end is used for outputting through light to the optical fiber, namely, for transmitting the through light to other equipment. The transmission output end is used for outputting transmission light to the optical fiber, namely for down wave. The transmissive output can also be referred to as a down wave output.
Fig. 3 shows a structure of the optical add/drop multiplexer as a wavelength division device. In the structure shown in fig. 3, the input module 11 is disposed on the light path between the through input end and the filtering diaphragm 12, the filtering diaphragm 12 is disposed on the output light path of the input module 11, the output module 14 is disposed on the reflection light path of the filtering diaphragm 12, and the transmission loopback module 13 is disposed on the transmission light path of the filtering diaphragm 12.
In the configuration shown in fig. 3, the case of adjusting the wavelength of the lower wavelength of the optical add/drop multiplexer to the target wavelength will be described. For example, assuming that the wavelength of the optical add/drop multiplexer is the first wavelength, the wavelength of the optical add/drop multiplexer is adjusted from the first wavelength to the target wavelength, so that the wavelength of the optical add/drop multiplexer is the target wavelength. Or, assuming that the present optical add/drop multiplexer does not have a drop output (i.e. there is no transmission output), adjusting the drop wavelength of the optical add/drop multiplexer to the target wavelength. Hereinafter, the following description will be given taking an example of adjusting the wavelength of the lower wave of the optical add/drop multiplexer from the first wavelength to the target wavelength.
In the process of adjusting the lower wavelength of the optical add/drop multiplexer to the target wavelength, the first input light is input from the through input end. The input member 11 outputs the output light of the first input light to the filter diaphragm 12. The input module 11 adjusts an incident angle of the first input light on the filter diaphragm 12, so that the incident angle of the first input light on the filter diaphragm 12 is adjusted to an incident angle corresponding to the target wavelength, that is, the incident angle is adjusted to a target value. For example, the control unit controls the input module 11 to output the output light of the first input light to the filter diaphragm 12, and adjusts the incident angle of the first input light on the filter diaphragm 12, so that the incident angle of the output light of the first input light on the filter diaphragm 12 is adjusted to the incident angle corresponding to the target wavelength. When the incident angle is the target value, the light of the target wavelength is transmitted entirely through the filter film 12. The output light of the first input light herein refers to the light of the first input light output from the input member 11.
In the incident angle changing process, after the output light of the first input light passes through the filtering diaphragm 12, the reflected light (i.e., the first reflected light) of the output light of the first input light on the filtering diaphragm 12 and the transmitted light (i.e., the first transmitted light) of the output light of the first input light on the filtering diaphragm 12 are obtained. The first reflected light is output to the output module 14, and the first transmitted light is output to the transmission loopback module 13. The output component 14 receives the first reflected light and outputs the first reflected light to the through output terminal. The transmission loopback component 13 receives the first transmission light and outputs the first transmission light to the output component 14, and the output component 14 also outputs the first transmission light to the through output end. For example, the control section controls the output assembly 14 to output the first reflected light to the through output terminal. The control section controls the transmission loopback module 13 to output the first transmitted light to the output module 14, and the output module 14 also outputs the first transmitted light to the through output terminal. Thus, the first transmitted light is also output to the through output terminal without being output to the transmission output terminal, and in fig. 3, the dotted line with an arrow indicates that there is no light output from the transmission output terminal. Similarly, for fig. 4 to 7 and fig. 9 described later, the dotted line with an arrow indicates that there is no light output at the transmission output end.
Thus, the down wavelength can be automatically adjusted by changing the incident angle. In addition, by the transmission loopback module 13 and the output module 14, the reflected light and the transmitted light of the output light of the first input light in the filtering diaphragm 12 during the adjustment process of the wavelength of the lower wave can be both output to the through output end, and the transmitted light cannot be output from the through output end, so that the loss of the first input light cannot be caused.
It should be noted here that the reason why the transmitted light exists on the filtering diaphragm 12 during the incident angle changing process for the output light of the first input light is that: the incident angle of the output light of the first input light incident on the filtering diaphragm 12 is always changed, and the change of the incident angle can change the transmission wavelength of the filtering diaphragm 12; if there is light with exactly the transmission wavelength in the first input light, when the output light of the first input light is incident to the filter diaphragm 12, the light with the transmission wavelength is transmitted through the filter diaphragm 12.
It should be further noted that, since the reflected light of the output light of the first input light at the filtering diaphragm 12 can be already output to the through output end when the incident angle is changed to the target value, the input module 11 and the output module 14 can output the reflected light of the output light of the first input light at the filtering diaphragm 12 to the through output end without readjustment after the incident angle is changed to the target value until the wavelength of the down wave is adjusted next time.
For example, the optical add/drop multiplexer may change the wavelength of the lower wave when receiving the message of changing the wavelength of the lower wave, or may change the wavelength of the lower wave periodically.
Illustratively, in the structure shown in fig. 3, the input module 11 includes a first movable mirror 111, and the first movable mirror 111 is disposed on the optical path between the through input terminal and the filter diaphragm 12. In the incident angle changing process, the first movable mirror 111 receives the first input light, and the first movable mirror 111 changes the incident angle of the output light of the first input light at the filter diaphragm 12 to a target value by rotating. The target value is the incident angle of the first input light when the transmission wavelength of the filter diaphragm 12 is the target wavelength. Illustratively, when the transmission wavelength of the filter diaphragm 12 is a first wavelength, the incident angle of the first input light is a first value, and the first movable mirror 111 rotates at a constant speed to change the incident angle of the output light of the first input light on the filter diaphragm 12 from the first value to a target value.
Alternatively, the control unit controls the first movable mirror 111 to rotate, so as to change the incident angle of the output light of the first input light on the filter diaphragm 12 from the first value to the target value.
After the incident angle is changed to the target value, the first movable mirror 111 stops rotating, the first movable mirror 111 receives the first input light, the first movable mirror 111 makes the output light of the first input light incident on the filter membrane 12, and the incident angle is the target value.
By way of example, FIG. 4 provides a schematic illustration of another input assembly 11. In the configuration shown in fig. 4, the input assembly 11 further includes a first fixed mirror 112. The first fixed mirror 112 is disposed on the optical path between the pass-through input end and the first movable mirror 111. The first movable reflecting mirror 111 is disposed on the optical path between the first fixed reflecting mirror 112 and the filter diaphragm 12.
The first input light enters the optical add/drop multiplexer through the straight input end and then enters the first fixed mirror 112. The first fixed mirror 112 reflects the first input light to the first movable mirror 111. The first movable mirror 111 receives the first input light. In the incident angle changing process, the control section controls the first movable mirror 111 to rotate, and changes the incident angle of the output light of the first input light on the filter diaphragm 12 from the first value to the target value. After the incident angle changes to the target value, the first movable mirror 111 stops rotating, the first movable mirror 111 enters the output light of the first input light to the filter diaphragm 12, and the incident angle is the target value.
In this way, in the structures shown in fig. 3 and 4, the input module 11 includes the first movable mirror 111, and is capable of changing the incident angle at which the output light of the first input light is incident on the filter diaphragm 12, thereby realizing a change in the transmission wavelength of the output light of the first input light at the filter diaphragm 12. After entering the optical add/drop multiplexer, the first input light first passes through the first fixed mirror 112, rather than directly entering the first movable mirror 111, so that the transmission direction of the first input light can be changed, and the size of the optical add/drop multiplexer can be relatively small.
Illustratively, the input assembly 11 further includes at least one lens 114, and referring to fig. 5, fig. 5 is a schematic structural diagram of the input assembly 11 including two lenses 114. The two lenses 114 are disposed in the optical path scanning range between the first movable mirror 111 and the filter diaphragm 12. Illustratively, the at least one lens 114 may be a convex lens, and the at least one lens 114 is configured to converge the first input light. In the embodiment of the present application, the optical path scanning range is composed of a plurality of optical paths formed by the rotation of the movable mirror.
It should be noted that, in the above-mentioned fig. 5, the input assembly 11 includes a movable mirror, a fixed mirror and two lenses, which is only an exemplary implementation, and there may be other implementations in practical application of the input assembly 11. For example, the input assembly 11 includes a plurality of movable mirrors and a lens. As another example, the input assembly 11 includes one movable mirror and a plurality of fixed mirrors. As another example, the input module 11 includes one movable mirror and a plurality of fixed mirrors, and the like.
By way of example, fig. 3 provides a schematic diagram of the output assembly 14. In the structure shown in fig. 3, the output assembly 14 includes a second movable mirror 141. The second movable mirror 141 is disposed on the optical path between the through output end and the filter diaphragm 12.
During the change of the incident angle, the second movable mirror 141 rotates to output the reflected light (i.e., the first reflected light) of the output light of the first input light on the filter diaphragm 12 to the through output terminal. For example, the control unit controls the second movable mirror 141 to rotate, and the second movable mirror 141 outputs the first reflected light of the output light of the first input light on the filter diaphragm 12 to the through output terminal. In addition, the transmission loopback component 13 outputs the first transmission light to the second movable mirror 141, and the second movable mirror 141 outputs the first transmission light to the through output end as well.
After the incident angle is changed to the target value, the second movable mirror 141 stops rotating, and the reflected light (i.e., the second reflected light) of the output light of the first input light at the filter diaphragm 12 is output to the second movable mirror 141. The second movable mirror 141 reflects the second reflected light to output to the through output terminal. Since the second reflected light can be output to the through output terminal when the incident angle is changed to the target value, the second movable mirror 141 can output the second reflected light to the through output terminal without rotating, starting when the incident angle is changed to the target value.
By way of example, FIG. 6 provides another schematic of the output assembly 14. In the structure shown in fig. 6, the output assembly 14 includes a second movable mirror 141 and a second fixed mirror 143. The second movable reflecting mirror 141 is provided on the optical path between the second fixed reflecting mirror 143 and the filter diaphragm 12. The second fixed mirror 143 is disposed on the optical path between the through output end and the second movable mirror 141.
In the incident angle changing process, the control unit controls the second movable reflecting mirror 141 to rotate, and the second movable reflecting mirror 141 reflects and outputs the first reflected light to the second fixed reflecting mirror 143. The second fixed mirror 143 reflects and outputs the first reflected light to the through output terminal. After the incident angle changes to the target value, the second movable reflecting mirror 141 stops rotating, the second movable reflecting mirror 141 reflects the second reflected light to the second fixed reflecting mirror 143, and the second fixed reflecting mirror 143 reflects the second reflected light to the direct output end.
Thus, the output unit 14 includes the second movable mirror 141, and is capable of outputting the reflected light of the first input light at the filter diaphragm 12 to the through output end. And the output module 14 further comprises a second fixed mirror 143, which can change the transmission direction of the reflected light, so that the volume of the optical add/drop multiplexer is small.
It should be noted that, in the above fig. 6, the output assembly 14 includes a movable mirror and a fixed mirror, which is only an exemplary implementation manner, and in practical applications, the output assembly 14 may have other implementation manners. For example, the output assembly 14 includes a plurality of movable mirrors. As another example, the output assembly 14 includes a movable mirror and a plurality of fixed mirrors. As another example, the output assembly 14 includes a plurality of movable mirrors, a fixed mirror, and the like.
Illustratively, in the structure shown in fig. 3, the transmissive loopback assembly 13 includes a third movable mirror 131 and a fourth movable mirror 132. The third movable mirror 131 is disposed in the optical path scanning range between the filter diaphragm 12 and the fourth movable mirror 132. The fourth movable mirror 132 is disposed in the optical path scanning range between the third movable mirror 131 and the filter diaphragm 12.
In the incident angle changing process, the third movable mirror 131 rotates to reflect the first transmission light of the output light of the first input light at the filter diaphragm 12 to the fourth movable mirror 132. The fourth movable mirror 132 receives the first transmitted light, and outputs the first transmitted light to the output unit 14 by rotating. For example, the control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 outputs the first transmitted light to the fourth movable mirror 132 by reflection. The control unit controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 outputs the first transmitted light to the filter film 12 by reflection. The filter membrane 12 outputs the first transmitted light in transmission to the output assembly 14. The output assembly 14 outputs the first transmitted light to the through output terminal.
Illustratively, in the case where the output assembly 14 includes the second movable reflecting mirror 141 and the second fixed reflecting mirror 143, the first transmitted light is output to the through output terminal through the second movable reflecting mirror 141 and the second fixed reflecting mirror 143 in this order.
Here, the reason why the output light of the first input light can also be output to the through output end by the first transmitted light of the filter diaphragm 12 is as follows: the third movable mirror 131 and the fourth movable mirror 132 cooperate to coincide the first transmitted light with the reflected light of the first input light on the filter diaphragm 12 after passing through the filter diaphragm 12 again, and the incident angle when the first transmitted light passes through the filter diaphragm 12 again is the incident angle when the first transmitted light is transmitted.
In this way, in the incident angle changing process, the first transmission light of the output light of the first input light at the filtering diaphragm 12 can also be output to the through output end, so that the first input light is completely output to the through output end, and the loss of the first input light is reduced.
Illustratively, fig. 7 shows another configuration of the transmissive loop back assembly 13. In the configuration shown in fig. 7, the transmissive loop back assembly 13 further includes a third fixed mirror 135. The third fixed mirror 135 is provided in the optical path scanning range between the fourth movable mirror 132 and the filter diaphragm 12.
In the incident angle changing process, the control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects the first transmission light of the output light of the first input light on the filter film 12 to the fourth movable mirror 132. The control unit controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 reflects and outputs the first transmitted light to the third fixed mirror 135. The third fixed mirror 135 reflects the first transmitted light to the filter membrane 12. The filter membrane 12 outputs the first transmitted light in transmission to the output assembly 14. The output assembly 14 outputs the first transmitted light to the through output terminal. Here, the control means controls the third movable mirror 131 and the fourth movable mirror 132 to rotate synchronously. Thus, the third fixed mirror 135 is provided so that the transmission direction of the transmitted light is changed, so that the optical add/drop multiplexer is small in size.
Illustratively, after the incident angle is changed to the target value, the optical add/drop multiplexer will output the light with the lower wavelength from the transmission output end, and the structure of the optical add/drop multiplexer is shown in fig. 8 accordingly. When the incident angle is changed to a target value, the transmission wavelength of the filter diaphragm 12 is a target wavelength (i.e., a lower wavelength). The transmitted light (i.e., the second transmitted light) of the output light of the first input light on the filter diaphragm 12 is incident on the third movable mirror 131. The third movable mirror 131 rotates to output the second transmitted light to the transmission output terminal. For example, the control part controls the third movable mirror 131 to rotate, and the third movable mirror 131 outputs the second outgoing light to the transmission output end. Thus, the optical add/drop multiplexer can also output the light with the lower wavelength from the transmission output end, namely, realize the lower wavelength.
Illustratively, in the structure shown in fig. 8, a fourth fixed mirror 136 is optionally disposed on the optical path between the third movable mirror 131 and the transmission output end. The fourth fixed mirror 136 belongs to the transmissive loop back assembly 13. The second transmitted light is reflected by the third movable mirror 131 to the fourth fixed mirror 136, and the fourth fixed mirror 136 reflects the second transmitted light to the transmission output end. Thus, the fourth fixed mirror 136 is disposed so that the transmission direction of the second transmitted light is changed, so that the volume of the optical add/drop multiplexer is small.
Illustratively, the transmissive loopback assembly 13 further includes at least one lens 114. The lens 114 is optionally disposed between the third fixed mirror 135 and the filtering diaphragm 12, and the lens 114 is configured to converge the light of the first input light on the filtering diaphragm 12, so that the light spot is relatively good.
It should be noted that the transmission loopback assembly 13 includes a movable mirror and a fixed mirror, where the number and arrangement of the movable mirror and the fixed mirror may be set according to practical applications, and the number and arrangement are not limited in the embodiment of the present application.
Illustratively, the filtering diaphragm 12 has different filtering bandwidths (the filtering bandwidths can also be referred to as transmission bandwidths) for the lights with the same wavelength and different polarization states, and in order to make the filtering bandwidths of the lights with the same wavelength in the first input light the same, the first input light is converted into the single-polarization light. Accordingly, the structure of the optical add/drop multiplexer shown in fig. 9 is provided.
In the optical add/drop multiplexer shown in fig. 9, the input module 11 further includes a first polarization beam splitting module 113, and the output module 14 further includes a first polarization beam combining module 142. Illustratively, when the input assembly 11 includes a first movable mirror 111 and a first fixed mirror 112, a first polarization beam splitting assembly 113 is disposed on the optical path between the pass-through input end and the first fixed mirror 112. Alternatively, first polarization beam splitting element 113 is disposed on the optical path between first movable mirror 111 and first fixed mirror 112.
Illustratively, when the output assembly 14 includes the second movable mirror 141, the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end. Illustratively, when the output assembly 14 includes the second movable mirror 141 and the second fixed mirror 143, the first polarization beam combining assembly 142 is disposed on the optical path between the second fixed mirror 143 and the through output end. Alternatively, the first polarization beam combiner 142 is disposed on the optical path between the second movable mirror 141 and the second fixed mirror 143.
When the first input light passes through the first polarization beam splitting assembly 113, the first polarization beam splitting assembly 113 performs polarization beam splitting on the first input light to obtain first single-polarization light. The first single polarized light comprises two beams of light which have the same polarization state and are parallel to each other, and the distance between the two beams of light which are included in the first single polarized light is narrower.
In the incident angle changing process, the control part controls the first movable reflecting mirror 111 to rotate, the first movable reflecting mirror 111 reflects the first single polarized light to the filter film 12, and the incident angle of the first single polarized light at the filter film 12 is changed to a target value. The control unit can also control the second movable mirror 141 to rotate, and the second movable mirror 141 outputs the first reflection light of the first single-polarization light on the filter film 12 to the first polarization beam combining assembly 142.
The control component also controls the transmission loopback component 13, and the transmission loopback component 13 outputs the first transmission light of the first single polarization light on the filtering diaphragm 12 to the filtering diaphragm 12. The filter film 12 outputs the first transmitted light to the second movable mirror 141. The second movable mirror 141 outputs the first transmitted light to the first polarization beam combining assembly 142. Illustratively, the control unit controls the third movable mirror 131 and the fourth movable mirror 132 to rotate, and outputs the first transmission light of the first single-polarized light on the filter film 12 to the first polarization beam combining assembly 142 through the third movable mirror 131, the fourth movable mirror 132, the filter film 12 and the second movable mirror 141.
The first polarization beam combining assembly 142 performs polarization beam combining on the first reflected light to obtain a first polarization beam combining light, and outputs the first polarization beam combining light to the through output end. And the first polarization beam combining component 142 performs polarization beam combining on the first transmission light to obtain a second polarization beam combining light, and outputs the second polarization beam combining light to the through output end. In this way, the first input light is converted into a single polarized light and enters the filtering diaphragm 12, so that the filtering bandwidths for the same wavelength of light when the first input light passes through the filtering diaphragm 12 are the same. And finally, when the light is output to the through output end, the single polarized light is converted into the polarized beam combining light (also called dual polarized light), so that the light output by the through output end is the polarized beam combining light.
Illustratively, where the optical add/drop multiplexer will also include a transmissive output, the transmissive loopback assembly 13 also includes a second polarization beam combining assembly 133, see fig. 10. The second polarization beam combiner 133 is disposed on the light path between the third movable mirror 131 and the transmission output end. For example, in the presence of the fourth fixed mirror 136, the second polarization beam combining component 133 may be disposed on the optical path between the fourth fixed mirror 136 and the transmissive output end.
After the incident angle is changed to the target value, the first input light is input from the through input end, and the first polarization beam splitting assembly 113 performs polarization beam splitting on the first input light to obtain first single polarization light. The first single polarized light is output to the filter membrane 12. The filter film 12 transmits and reflects the first single-polarization light to obtain a second reflected light and a second transmitted light. The second reflected light is output to the first polarization beam combining assembly 142, and the first polarization beam combining assembly 142 performs polarization beam combining on the first reflected light to obtain first polarization beam combining light, and outputs the first polarization beam combining light to the through output end. The second transmitted light is output to the third movable mirror 131. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 outputs the second transmission light of the first single polarized light on the filter film 12 to the second polarization beam combining assembly 133. The second polarization beam combining assembly 133 performs polarization beam combining processing on the second transmission light to obtain third polarization beam combining light, and outputs the third polarization beam combining light to the transmission output end. Thus, for light of the target wavelength, the polarization state is the same when the light enters the filter film 12, the filter bandwidth is the same, and the output light at the transmission output end is also a polarized combined beam light.
Illustratively, the polarization beam splitting and combining components may be birefringent crystals.
Illustratively, fig. 11 also provides a schematic diagram of the structure of the polarization beam splitting assembly. The polarization beam splitting assembly comprises a polarization beam splitting prism, a half-wave plate and a reflecting mirror. The first input light is incident to the polarization beam splitter prism and is divided into two beams of light with vertical polarization states. One of the two beams of light with vertical polarization states passes through a reflector, and the other beam of light passes through a half-wave plate to adjust the polarization state, so that the polarization states of the two beams of light are the same, the two beams of light are parallel, and the distance between the two beams of light is narrow.
Fig. 12 also provides a schematic structural diagram of the polarization beam combiner, as an example. The polarization beam combination assembly comprises a polarization beam combination prism, a half-wave plate and a reflecting mirror. The reflected light of the first single polarization light or the transmitted light of the first single polarization comprises two beams of light, the polarization states of the two beams of light are the same, the two beams of light are parallel, and the distance between the two beams of light is narrow. One beam of light passes through a mirror to change the direction of transmission to be perpendicular to the other beam. And then one of the two beams of light passes through a half-wave plate, so that the polarization states of the two beams of light are vertical, and the two beams of light with the vertical polarization states are combined into a polarization beam combination light through a polarization beam combination prism.
In this way, although the input light is divided into two single polarized lights having the same polarization state after being polarized and split by the polarization splitting means, the two single polarized lights are parallel to each other and have a relatively narrow pitch, and thus it can be considered that one single polarized light enters the filter film 12.
It should be noted that, only two examples of the polarization beam splitting assembly and the polarization beam combining assembly are given here, and in actual application, the polarization beam splitting assembly and the polarization beam combining assembly may be selected according to actual needs, which is not limited in the embodiment of the present application.
For example, the filtering bandwidths of the filtering diaphragms 12 of different polarization states of light with the same wavelength are different, and fig. 13 shows a schematic structural diagram of another optical add/drop multiplexer in order to continuously change the filtering bandwidth of the first input light at the filtering diaphragms 12. In the configuration shown in fig. 13, the optical add/drop multiplexer further includes a first movable half-wave plate 15. The first movable half-wave plate 15 is a half-wave plate whose optical axis is adjustable. The first movable half-wave plate 15 is disposed on the optical path between the first polarization beam splitting assembly 113 and the filter membrane 12, and exemplarily, the first movable half-wave plate 15 is disposed on the optical path between the first polarization beam splitting assembly 113 and the first movable mirror 111 in fig. 13. The control member is connected to the first movable half-wave plate 15. Or the first movable half-wave plate 15 is controlled according to the control logic preset by itself. For example, rotation is performed periodically, etc.
The control means controls the first movable half-wave plate 15 to rotate, and changes the polarization state of the first single-polarized light when the first single-polarized light passes through the first movable half-wave plate 15. Illustratively, when the transmission wavelength of the filter diaphragm 12 is the target wavelength, the control part determines the rotation angle corresponding to the target wavelength, and the control part controls the first movable half-wave plate 15 to rotate by the rotation angle. Here, the control unit determines the rotation angle corresponding to the target wavelength by: the control unit determines the rotation angle corresponding to the target wavelength from the correspondence relationship between the rotation angle and the wavelength, and the correspondence relationship may be stored in a memory of the control unit or a storage accessible to the control unit. Thus, the first movable half-wave plate 15 is controlled to rotate, so that the polarization state of the first single polarized light can be adjusted, and the filter bandwidth can be changed.
Illustratively, when the optical add/drop multiplexer is used as a wavelength division device, the optical add/drop multiplexer may also be used as a wavelength combination device, and the optical add/drop multiplexer further includes an add input terminal to which the second input light is input. The second input light is light with a single wavelength, the second input light input from the upwave input end is incident on the second movable mirror 141, and the second movable mirror 141 reflects the second input light to the through output end.
Thus, when the optical add/drop multiplexer is used as a wavelength division device, the lower wavelength can be automatically adjusted. In the process of automatically adjusting the down wave wavelength, the transmission loopback component 13 is arranged, so that the reflected light and the transmitted light of the straight-through input light on the filtering diaphragm 12 can be output from the straight-through output end, and the transmitted light cannot be output from the transmission output end, so that the loss of the input light of the straight-through input end can be reduced. Moreover, since the movable half-wave plate is provided, the filter bandwidth of the light with the lower wave length on the filter diaphragm 12 can be continuously changed.
It should be noted that, when the optical add/drop multiplexer is used as a wavelength division device, in the process of changing the incident angle, whether the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 exist or not is not affected, that is, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 are not provided. Therefore, during the incident angle changing process, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 are moved out of the optical path, and after the incident angle is changed to the target value, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 are moved into the optical path. Of course, in order to simplify the control, it can also be that after the optical add/drop multiplexer is produced, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 are always located in the optical path.
The structure of the optical add/drop multiplexer as a multiplexer will be described.
Fig. 14 shows a structure of an optical add/drop multiplexer as a multiplexing device. In the structure shown in fig. 14, the input module 11 is disposed on the light path between the through input end and the filter diaphragm 12, the filter diaphragm 12 is disposed on the output light path of the input module 11, the output module 14 is disposed on the reflection light path of the filter diaphragm 12, and the transmission loopback module 13 is disposed on the transmission light path of the filter diaphragm 12.
The optical add/drop multiplexer includes a through input terminal, a through output terminal, and an add input terminal. The straight-through input end, the straight-through output end and the up-wave input end are respectively connected with optical fibers. The through input end is used for inputting first input light, and the first input light is input light transmitted by other equipment. The straight-through output end is used for outputting straight-through light to the optical fiber. The upwave input end is used for inputting light with single wavelength.
In the configuration shown in fig. 14, the case of adjusting the wavelength of the add/drop multiplexer to the target wavelength will be described. For example, assuming that the add wavelength of the current optical add/drop multiplexer is the first wavelength, the add wavelength of the optical add/drop multiplexer is adjusted from the first wavelength to the target wavelength, so that the add wavelength of the optical add/drop multiplexer is the target wavelength. Or, assuming that the existing optical add/drop multiplexer does not have an add input, adjusting the add wavelength of the optical add/drop multiplexer to be the target wavelength. In the following description of the wavelength multiplexing device, the wavelength up-conversion of the optical add/drop multiplexer from the first wavelength to the target wavelength will be described as an example.
The processing procedure in the process of adjusting the upper wavelength of the optical add/drop multiplexer to the target wavelength is described with reference to fig. 3, and is not described herein again. In fig. 14, a dotted line with an arrow indicates that the upwave input end is not upwave input light input. Similarly, in fig. 15 to 17 described later, the dotted line with an arrow also indicates that the upwave input end is not upwave input light input. As can be seen from fig. 14, the wavelength of the upper wave can be automatically adjusted by changing the incident angle. In addition, in the adjustment process of the upper wavelength, the reflected light and the transmitted light of the output light of the first input light at the filtering diaphragm 12 can be output to the through output end through the transmission loopback component 13 and the output component 14, and the transmitted light cannot be lost, so that the loss of the first input light cannot be caused.
For example, the optical add/drop multiplexer may change the wavelength of the add wavelength when receiving the change message of the wavelength of the add wavelength, or may change the wavelength of the add wavelength periodically.
Illustratively, in the structure shown in fig. 14, the input module 11 includes a first movable mirror 111, and the first movable mirror 111 is disposed on the optical path between the feed-through terminal and the filter diaphragm 12. The description of the light transmission process during the incident angle change and after the change to the target value refers to the description of fig. 3, which is not repeated herein.
By way of example, FIG. 15 provides a schematic illustration of another input assembly 11. In the structure shown in fig. 15, the input assembly 11 further includes a first fixed mirror 112. The first fixed reflecting mirror 112 is disposed on the optical path between the direct input end and the first movable reflecting mirror 111, and the first movable reflecting mirror 111 is disposed on the optical path between the first fixed reflecting mirror 112 and the filtering diaphragm 12. The first input light enters the optical add/drop multiplexer through the straight input end and then enters the first fixed mirror 112. The first fixed mirror 112 reflects the first input light to the first movable mirror 111.
In this way, the input unit 11 includes the first movable mirror 111, and can change the incident angle of the output light of the first input light incident on the filter diaphragm 12, thereby realizing the change of the transmission wavelength of the first input light at the filter diaphragm 12. After the first input light enters the optical add/drop multiplexer, the first input light firstly passes through a fixed reflector instead of being directly incident to the first movable reflector 111, so that the transmission direction of the first input light can be changed, and the size of the optical add/drop multiplexer can be smaller.
It should be noted that, in the above-mentioned fig. 15, the input assembly 11 includes one movable mirror and one fixed mirror, which is only an exemplary implementation. In practical applications, the input component 11 may have other implementations. For example, the input assembly 11 includes a plurality of movable mirrors. As another example, the input assembly 11 includes one movable mirror and a plurality of fixed mirrors. As another example, the input module 11 includes one movable mirror and a plurality of fixed mirrors, and the like.
Additionally, the input assembly 11 may also include at least one lens 114.
Illustratively, in the structure shown in fig. 14, the output assembly 14 includes a second movable mirror 141. The second movable mirror 141 is disposed on the optical path between the through output end and the filter diaphragm 12. In the incident angle changing process, the second movable mirror 141 rotates to reflect the first reflected light and the first transmitted light of the output light of the first input light on the filter diaphragm 12 to the through output end. For example, the control unit controls the second movable mirror 141 to rotate, and the second movable mirror 141 reflects and outputs the first reflected light and the second transmitted light to the through output terminal. After the incident angle changes to the target value, the second movable mirror 141 stops rotating, and reflects the second reflected light of the first input light on the filter diaphragm 12 to the through output end.
Illustratively, on the basis of fig. 14, the output assembly 14 further includes a second fixed mirror 143, see fig. 16. The second fixed reflecting mirror 143 is disposed on the optical path between the through output end and the second movable reflecting mirror 141, and the second movable reflecting mirror 141 is disposed on the optical path between the second fixed reflecting mirror 143 and the filter diaphragm 12. A description of a specific optical transmission process is made with reference to the description of fig. 6.
Thus, the output unit 14 includes the second movable mirror 141, and the reflected light of the first input light passing through the filter diaphragm 12 is output to the through output terminal. And the output module 14 further comprises a second fixed mirror 143, which can change the transmission direction of the reflected light, so that the volume of the optical add/drop multiplexer is small.
It should be noted that, in the foregoing fig. 16, the output assembly 14 includes a movable mirror and a fixed mirror, which is only an exemplary implementation manner, and in practical applications, the output assembly 14 may have other implementation manners, and the embodiment of the present application is not limited thereto.
Illustratively, the output assembly 14 may further include at least one lens 114, and the at least one lens 114 is disposed in the optical path scanning range between the filtering diaphragm 12 and the second movable mirror 141. The at least one lens 114 is for converging the first input light and the subsequently mentioned second input light.
Illustratively, in the structure shown in fig. 14, the transmissive loopback assembly 13 includes a third movable mirror 131 and a fourth movable mirror 132. The third movable mirror 131 is disposed in the optical path scanning range between the filter diaphragm 12 and the fourth movable mirror 132, and the fourth movable mirror 132 is disposed in the optical path scanning range between the third movable mirror 131 and the filter diaphragm 12.
During the incident angle changing process, the first transmitted light of the output light of the first input light at the filter diaphragm 12 is incident to the fourth movable mirror 132. The fourth movable mirror 132 rotates to output the first transmitted light to the third movable mirror 131 by reflection. The third movable mirror 131 rotates to reflect and output the first transmitted light to the filter diaphragm 12. For example, the control unit controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 outputs the first transmitted light to the third movable mirror 131 by reflection. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects and outputs the first transmitted light to the filter diaphragm 12. The filter membrane 12 outputs the first transmitted light in transmission to the output assembly 14. The output assembly 14 outputs the first transmitted light to the through output. Here, it is necessary to control the third movable mirror 131 and the fourth movable mirror 132 to rotate synchronously. In this way, in the incident angle changing process, the transmitted light of the output light of the first input light at the filtering diaphragm 12 can also be output to the through output end, so that the first output end is completely output to the through output end, and the first input light is not lost.
Illustratively, fig. 17 shows another configuration of the transmissive loop back component 13. In the configuration shown in fig. 17, the transmissive loopback assembly 13 further includes a fourth fixed mirror 136. The fourth fixed mirror 136 is disposed in the optical path scanning range between the fourth movable mirror 132 and the filter diaphragm 12.
In the incident angle changing process, the first transmission light of the output light of the first input light at the filtering diaphragm 12 is incident to the fourth fixed mirror 136, and the fourth fixed mirror 136 reflects the first transmission light to the fourth movable mirror 132. The fourth movable mirror 132 rotates to output the first transmitted light to the third movable mirror 131 by reflection. The third movable mirror 131 rotates to reflect and output the first transmitted light to the filter film 12. For example, the control unit controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 outputs the first transmitted light to the third movable mirror 131 by reflection. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects and outputs the first transmitted light to the filter diaphragm 12. The filter membrane 12 outputs the first transmitted light in transmission to the output assembly 14. The output assembly 14 outputs the first transmitted light to the through output.
Thus, the fourth fixed mirror 136 is disposed so that the transmission direction of the transmitted light is changed, so that the volume of the optical add/drop multiplexer is small.
It should be noted that, in fig. 17, the number and arrangement of the movable mirrors and the fixed mirrors in the transmission loopback assembly 13 may be adjusted according to practical applications, and the embodiment of the present application is not limited. In addition, a lens 114 can be included in the transmissive loopback component 13 for converging the first input light, etc.
Illustratively, the optical add/drop multiplexer further includes an add input end, see fig. 18, for inputting the added light, referred to as a second input light, which in the embodiment of the present application has a target wavelength. After the incident angle is changed to the target value, the transmission wavelength of the filter diaphragm 12 is the target wavelength. The second input light is input to the third movable mirror 131. The control unit controls the third movable mirror 131 to rotate, the third movable mirror 131 reflects the second input light to the filter diaphragm 12, and the incident angle is a target value. The transmitted light of the second input light at the filtering diaphragm 12 (referred to as third transmitted light) is output to the output assembly 14. The output assembly 14 outputs the third transmitted light to the through output. The reflected light (referred to as the second reflected light) of the output light of the first input light at the filter diaphragm 12 is output to the output element 14, and the output element 14 outputs the second reflected light to the through output end.
In this way, the second input light is output to the through output terminal through the third movable mirror 131, the filter diaphragm 12, and the output assembly 14, so that the optical add/drop multiplexer can realize the up-wave. After the output light of the first input light enters the filter diaphragm 12, the light transmitted by the filter diaphragm 12 should be light with the target wavelength, but the light with the target wavelength is not included in the first input light, so that the output light of the first input light is only reflected but not transmitted when entering the filter diaphragm 12, and the loss of the first input light is not caused. The reason why the first input light does not include light of the target wavelength here is: the wavelength of the upper wave cannot be the same as the wavelength of the through input light, and the data cannot be distinguished when the wavelengths are the same.
Illustratively, in the structure shown in fig. 18, a fifth fixed mirror 137 is optionally disposed on the optical path between the third movable mirror 131 and the upper wave input end, and the fifth fixed mirror 137 belongs to the transmissive loopback module 13. The second input light is incident to the fifth fixed mirror 137. The fifth fixed mirror 137 reflects the second input light to the third movable mirror 131. Thus, the fifth fixed mirror 137 is disposed such that the transmission direction of the second input light is changed, so that the optical add/drop multiplexer has a small volume.
Illustratively, the filtering diaphragms 12 have different filtering bandwidths for the light with the same wavelength and different polarization states, and in order to make the filtering bandwidth of the light with the same wavelength in the first input light the same at the filtering diaphragms 12, the first input light is converted into the light with single polarization, and accordingly, the structure of the optical add/drop multiplexer shown in fig. 19 is provided.
In the optical add/drop multiplexer shown in fig. 19, the input module 11 further includes a first polarization beam splitting module 113, and the output module 14 further includes a first polarization beam combining module 142. Illustratively, where input assembly 11 includes first movable mirror 111 and first fixed mirror 112, first polarizing beam splitting assembly 113 is disposed on the optical path between the pass-through input and first fixed mirror 112. Alternatively, the first polarization beam splitting element 113 is disposed on the optical path between the first movable mirror 111 and the first fixed mirror 112.
Illustratively, when the output assembly 14 includes the second movable mirror 141, the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end. Illustratively, when the output assembly 14 includes the second movable mirror 141 and the second fixed mirror 143, the first polarization beam combining assembly 142 is disposed on the optical path between the second fixed mirror 143 and the through output end. Alternatively, the first polarization beam combining assembly 142 is disposed on the light path between the second movable reflecting mirror 141 and the second fixed reflecting mirror 143.
When the first input light passes through the first polarization beam splitting assembly 113, the first polarization beam splitting assembly 113 performs polarization beam splitting on the first input light to obtain first single-polarization light.
In the incident angle changing process, the description of the light transmission process refers to the description of fig. 9, and is not repeated here.
Illustratively, the transmissive loopback assembly 13 further includes a second polarization beam splitting assembly 134, see fig. 19, the second polarization beam splitting assembly 134 is disposed on the optical path between the upper wave input end and the third movable mirror 131. Illustratively, in the presence of the fifth fixed mirror 137, the second polarization beam splitting assembly 134 is disposed on the optical path between the upwave input end and the fifth fixed mirror 137.
After the incident angle is changed to the target value, the first input light does not include light with the target wavelength, the first input light is input from the through input end, and the first polarization beam splitting assembly 113 performs polarization beam splitting on the first input light to obtain first single polarization light. The first single polarized light is output to the filter membrane 12. The filtering diaphragm 12 reflects the first single polarized light to obtain a second reflected light, the second reflected light passes through the second movable mirror 141 and is output to the first polarization beam combining assembly 142, and the first polarization beam combining assembly 142 performs polarization beam combining on the second reflected light and outputs the second reflected light to the through output end.
The second input light is input from the upwave input end and enters the second polarization beam splitting assembly 134. The second polarization beam splitting assembly 134 performs polarization beam splitting on the second input light to obtain second single-polarization light. The second polarization beam splitting assembly 134 outputs the second single-polarized light to the third movable mirror 131. The second single polarized light is two beams of light which have the same polarization state and are parallel to each other, and the distance between the two beams of light included in the second single polarized light is relatively narrow. The control unit controls the third movable mirror 131 to rotate, the third movable mirror 131 reflects the second input light to the filter membrane 12, and the incident angle is the target value, at this time, the filter membrane 12 transmits the second single polarized light, and the third transmitted light is obtained. Thus, the second single polarized light is output to the first polarization beam combining assembly 142 through the third movable mirror 131, the filter diaphragm 12, and the second movable mirror 141. The first polarization beam combining component 142 performs polarization beam combining on the third transmission light to obtain a fourth polarization combined beam, and outputs the fourth polarization combined beam to the through output end.
In this way, the light of the target wavelength input at the upstream input end can also be polarization split and polarization combined, so that the output is not affected and the filter bandwidth at the filter diaphragm 12 is not affected by the polarization state.
It should be noted here that after the incident angle is changed to the target value, the first input light does not include the light with the target wavelength, so the first input light is not transmitted on the filter diaphragm 12. The transmission of the first input light through the filter film 12 is not affected by the presence or absence of the first polarization beam splitting assembly 113, but the first polarization beam splitting assembly 113 is still provided for the reasons: since the first input light is finally outputted through, and is polarization-combined by the first polarization beam-combining component 142, polarization beam splitting is performed before the first input light is outputted.
Illustratively, the filtering bandwidths of the filtering diaphragms 12 of different polarization states of light with the same wavelength are different, and fig. 20 shows a schematic structural diagram of another optical add/drop multiplexer in order to continuously change the filtering bandwidth of the second input light at the filtering diaphragms 12. In the configuration shown in fig. 20, the optical add/drop multiplexer further includes a second movable half-wave plate 16. The second movable half-wave plate 16 is disposed on the optical path between the second polarization beam splitting assembly 134 and the third movable mirror 131.
The control means controls the second movable half-wave plate 16 to rotate, and changes the polarization state of the second single-polarized light when the second single-polarized light passes through the second movable half-wave plate 16. Illustratively, when the transmission wavelength of the filter diaphragm 12 is the target wavelength, the control part determines the rotation angle corresponding to the target wavelength, and the control part controls the second movable half-wave plate 16 to rotate by the rotation angle. Here, the control unit determines the rotation angle corresponding to the target wavelength by: the control unit determines the rotation angle corresponding to the target wavelength from the correspondence relationship between the rotation angle and the wavelength, and the correspondence relationship may be stored in a memory of the control unit or a storage accessible to the control unit. In this way, the second movable half-wave plate 16 can be controlled to rotate to adjust the polarization state of the second single polarized light, so that the filter bandwidth can be adjusted.
Thus, when the optical add/drop multiplexer is used as a wave combining device, the wavelength of the upper wave can be automatically changed. In the process of automatically changing the upper wave wavelength, the transmission loopback component 13 is arranged, so that the reflected light and the transmitted light of the straight-through input light on the filtering diaphragm 12 can be output from the straight-through output end, the transmitted light cannot be lost, and the loss of the input light of the straight-through input end can be reduced. Moreover, due to the arrangement of the movable half-wave plate, the polarization state of the upwave input light can be continuously changed by controlling the movable half-wave plate, and further, the filtering bandwidth of the upwave input light on the filtering membrane 12 can be continuously changed.
When the optical add/drop multiplexer is a wavelength division device or a wavelength combination device, the control unit controls the first movable mirror 111 to rotate and controls the second movable mirror 141, the third movable mirror 131, and the fourth movable mirror 132 to rotate synchronously during the change of the incident angle. The rate, direction and magnitude of rotation of each movable mirror may be pre-configured, and the control means may control the respective movable mirrors by reading the pre-stored rate and direction. For example, the control unit controls the first movable mirror 111 to rotate counterclockwise by 1 degree at a constant speed, and the control unit controls the second movable mirror 141, the third movable mirror 131, and the fourth movable mirror 132 to rotate clockwise by 1 degree at a constant speed. After the incident angle is changed to the target value, the first movable mirror 111 and the second movable mirror 141 are both rotated to the corresponding positions, and rotation is not required, and the control means controls the third movable mirror 131 in accordance with the rate, direction, and magnitude of rotation of the third movable mirror 131.
It should be noted that, during the incident angle changing process, whether the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 exist or not is not affected, that is, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 are not disposed. Therefore, during the incident angle changing process, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 are moved out of the optical path, and after the incident angle is changed to the target value, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 are moved into the optical path. Of course, in order to simplify the control, it can also be that after the optical add/drop multiplexer is produced, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 are always located in the optical path.
The optical add/drop multiplexer of the second principle is described below.
The optical add/drop multiplexer comprises a first input block 21, a totally-reflective diaphragm 22, at least one first filtering diaphragm 23 and a first output block 24.
Alternatively, the total reflection diaphragm 22 and the at least one first filter diaphragm 23 may be provided separately or integrated together. When integrated together, the total reflection diaphragm 22 and the at least one first filter diaphragm 23 constitute a spliced diaphragm, in which the total reflection diaphragm 22 and each first filter diaphragm 23 are parallel.
Illustratively, when the fully-reflective film 22 and the at least one first filtering film 23 form a spliced film, the fully-reflective film 22 and the at least one first filtering film 23 are stacked together side by side, the surfaces of the fully-reflective film 22 and each first filtering film 23 are not overlapped, and the surfaces of any two first filtering films 23 are also not overlapped. Here, the surface is an incident surface or an exit surface of light, that is, a surface perpendicular to the thickness direction, and the side surface is a surface in the thickness direction in the hologram 22 and the first filter film 23. Illustratively, the total reflection diaphragm 22 and each of the first filter diaphragms 23 are parallel, but not in the same plane. Alternatively, the total reflection diaphragm 22 and each of the first filter diaphragms 23 are parallel and located on the same plane.
Illustratively, the total reflection diaphragm 22 is a diaphragm that reflects all wavelengths of light involved in the embodiments of the present application. The filter bandwidth of each first filter diaphragm 23 is different. For example, the at least one first filter diaphragm 23 is two filter diaphragms, and the filter bandwidths are 100G and 200G, respectively. In the embodiment of the present application, the arrangement of the total reflection diaphragm 22 and the first filter diaphragm 23 in the spliced diaphragm is not limited. For example, the fully reflective diaphragm 22 is located to the left of at least a first one of the first filtering diaphragms 23, or to the right, or between any two of the first filtering diaphragms 23, etc. In the embodiment of the present application, a spliced diaphragm composed of the total reflection diaphragm 22 and the at least one first filter diaphragm 23 is taken as an example for explanation. In the following drawings, the spliced membrane is described as an example.
Illustratively, the first input module 21, the total reflection diaphragm 22, the at least one first filtering diaphragm 23 and the first output module 24 cooperate to perform the function of an optical add/drop multiplexer. When mutually matched, the first input assembly 21, the total reflection diaphragm 22, the at least one first filtering diaphragm 23 and the first output assembly 24 are independently controlled according to a certain rule respectively. For example, the first input assembly 21, the total reflection diaphragm 22, the at least one first filtering diaphragm 23 and the first output assembly 24 periodically execute preset logic respectively, and achieve mutual cooperation and the like. Alternatively, the control is performed by a control unit when they are coordinated with each other.
Illustratively, the control component is integrated with any of the first input assembly 21, the total reflection diaphragm 22, the at least one first filtering diaphragm 23 and the first output assembly 24. For example, the control part is provided inside the first input module 21 as a separate controller, or in the first movable mirror 111 included in the first input module 21. Alternatively, the control component is a separate device within the optical add/drop multiplexer.
The control unit is connected to the first input assembly 21, the total reflection diaphragm 22, the at least one first filter diaphragm 23 and the first output assembly 24, respectively. Illustratively, the connection may be an electrical connection.
In the embodiment of the present application, the control of the first input assembly 21, the total reflection diaphragm 22, the at least one first filtering diaphragm 23, and the first output assembly 24 by the control means is taken as an example for explanation.
The structure of the optical add/drop multiplexer as a wavelength division device will be described below.
An optical add/drop multiplexer as described hereinbefore comprises a through input, a through output and a transmissive output. The first input assembly 21 is disposed on a light path between the through input end and the splicing diaphragm, and the splicing diaphragm is disposed on an output light path of the first input assembly 21.
Fig. 21 shows a structure of an optical add/drop multiplexer as a wavelength division device. In the configuration shown in fig. 21, the case of adjusting the wavelength of the lower wavelength of the optical add/drop multiplexer to the target wavelength will be described. During the adjustment of the lower wavelength of the optical add/drop multiplexer to the target wavelength, the all-reflection diaphragm 22 is moved into the output optical path of the first input module 21 (this step is performed when the all-reflection diaphragm 22 is not on the output optical path), and the first input light is input from the through input end. The first input assembly 21 outputs the first input light to the transflective film 22, and changes the incident angle of the output light of the first input light on the transflective film 22 to a target value, which corresponds to the target wavelength as described above. For example, the control unit controls the splicing diaphragm to move, and moves the total reflection diaphragm 22 into the output optical path of the first input module 21. The control part controls the first input module 21 to output the output light of the first input light to the total reflection diaphragm 22, and changes the incident angle of the output light of the first input light on the total reflection diaphragm 22 to a target value. The output light of the first input light is light output by the first input light through the first input assembly 21.
The first output assembly 24 outputs the reflected light output from the total reflection diaphragm 22 through, i.e., to the through output terminal. For example, the control section controls the first output assembly 24, and the first output assembly 24 outputs the reflected light output from the total reflection diaphragm 22 to the through output terminal. It should be noted here that the output light of the first input light is not transmitted through the total reflection film 22, in fig. 21, the dotted line with an arrow indicates that there is no light output at the transmission output end, and similarly, for fig. 22 and fig. 23, the dotted line with an arrow also indicates that there is no light output at the transmission output end. Since the total reflection diaphragm 22 is parallel to the first filter diaphragm 23, it is equivalent to adjust the incident angle of the first input light on the first filter diaphragm 23.
After the incident angle is changed to the target value, the transmission wavelength of the first filter diaphragm 23 is the target wavelength, and a certain first filter diaphragm 23 (hereinafter referred to as the target filter diaphragm) is moved into the output optical path of the first input assembly 21, and the total reflection diaphragm 22 is moved out of the output optical path. For example, the control unit controls the movement of the splicing diaphragm to move the target filter diaphragm into the output optical path of the first input assembly 21 and to move the total reflection diaphragm 22 out of the output optical path, the target filter diaphragm being moved into the position of the total reflection diaphragm 22 that was originally in the output optical path. The target filter diaphragm is a first filter diaphragm 23 corresponding to the target wavelength. The filter bandwidth of the target filter diaphragm is the same as the filter bandwidth required for the target wavelength. The first input light is reflected to the target filtering diaphragm through the first input assembly 21. The target filtering diaphragm transmits light of a target wavelength in the output light of the first input light and reflects light of other wavelengths. The reflected light of the first input light is output to the first output element 24 for through output (i.e., output to the through output), and the transmitted light of the first input light is output to the first output element 24 for transmission output (i.e., output to the transmission output). It should be noted here that, by selecting the target filtering diaphragm based on the target wavelength, the filtering bandwidth required by the target wavelength can be made to be close to the filtering bandwidth of the target filtering diaphragm, so that the performance of the optical add/drop multiplexer is better.
In this way, the down wave wavelength can be automatically adjusted during the change of the incident angle, and the total reflection diaphragm 22 is disposed so that the input light is not lost.
Illustratively, in the configuration shown in fig. 21, the first input assembly 21 includes a first movable mirror 111, and the first movable mirror 111 is disposed on the optical path between the feed-through input end and the spliced diaphragm. During the incident angle change, the first movable mirror 111 receives the first input light. The first movable mirror 111 changes the incident angle of the output light of the first input light on the total reflection diaphragm 22 to a target value by rotating. Illustratively, the control unit controls the first movable mirror 111 to rotate, and the first movable mirror 111 changes the incidence angle of the output light of the first input light on the total reflection diaphragm 22 to a target value. For example, the control unit can control the first movable mirror 111 to rotate at a constant speed, and change the incident angle of the output light of the first input light on the total reflection diaphragm 22 to a target value. After the incident angle changes to the target value, the first movable mirror 111 stops rotating, the target filtering diaphragm moves into the output optical path of the first input assembly 21, and the first movable mirror 111 receives the first input light and emits the output light of the first input light to the target filtering diaphragm. Since the target filter diaphragm is parallel to the total reflection diaphragm 22, the incident angle of the output light of the first input light incident on the target filter diaphragm is the target value.
By way of example, fig. 22 provides another schematic structure of the first input assembly 21. In the configuration shown in fig. 22, the first input assembly 21 further includes a first fixed mirror 112. The first fixed reflecting mirror 112 is disposed on the light path between the direct input end and the first movable reflecting mirror 111, and the first movable reflecting mirror 111 is disposed on the light path between the first fixed reflecting mirror 112 and the spliced membrane.
The first input light enters the optical add/drop multiplexer through the straight input end and then enters the first fixed mirror 112. The first fixed mirror 112 reflects the first input light to the first movable mirror 111.
In this way, in the structures shown in fig. 21 and 22, the first input assembly 21 includes the first movable mirror 111, and the incident angle of the first input light to the total reflection diaphragm 22 can be changed, so that the change of the transmission wavelength of the first input light at the target filter diaphragm is realized. After the first input light enters the optical add/drop multiplexer, the first input light first passes through the first fixed mirror 112, rather than directly entering the first movable mirror 111, so that the transmission direction of the first input light can be changed, and the size of the optical add/drop multiplexer can be smaller.
Illustratively, the first input assembly 21 further includes at least one lens 114, and fig. 23 is a schematic structural diagram of the first input assembly 21 including the at least one lens 114. At least one lens 114 is disposed in the optical path scanning range between the first movable mirror 111 and the spliced membrane. The at least one lens 114 is a convex lens, and the at least one lens 114 is configured to focus the first input light.
It should be noted that the structure of the first input assembly 21 described above is only an exemplary structure, and the number of the movable mirror, the fixed mirror and the lens included in the first input assembly 21 is not limited in the embodiment of the present application.
Illustratively, the first output assembly 24 includes a first sub-output assembly 241 and a second sub-output assembly 242, see fig. 24. The first sub-output element 241 is disposed on the optical path between the total reflection diaphragm 22 (or the target filter diaphragm) and the through output terminal. The second sub-output assembly 242 is disposed on the optical path between the total reflection diaphragm 22 (or the target filter diaphragm) and the transmission output end.
During the incident angle changing process, the first sub-output element 241 receives the reflected light of the output light of the first input light at the total reflection diaphragm 22, and reflects and outputs the reflected light to the through output end. After the incident angle changes to the target value, the first sub-output element 241 receives the reflected light of the output light of the first input light on the target filter, and reflects and outputs the reflected light to the through output end. The second sub-output assembly 242 receives the transmitted light of the output light of the first input light at the target filtering diaphragm. The control part controls the second sub-output assembly 242, and the second sub-output assembly 242 outputs the transmitted light to the transmission output end.
Illustratively, in the structure shown in fig. 24, the first sub-output assembly 241 includes a second movable mirror 141, and the second movable mirror 141 is disposed on the optical path between the target filtering diaphragm and the through output terminal.
During the incident angle change, the second movable mirror 141 rotates to reflect the reflected light of the output light of the first input light on the total reflection film 22 to the through output end. For example, the control unit controls the second movable mirror 141 to rotate, and the second movable mirror 141 reflects the output light of the first input light reflected by the total reflection diaphragm 22 to output the reflected light to the through output terminal. Thus, since the transmission direction of the reflected light is changed by the rotation of the first movable reflecting mirror 111, the rotation of the second movable reflecting mirror 141 is matched with the first movable reflecting mirror 111.
After the incident angle is changed to the target value, the second movable mirror 141 stops rotating. The second movable mirror 141 receives the reflected light of the output light of the first input light on the target filtering diaphragm, and reflects and outputs the reflected light of the output light of the first input light on the target filtering diaphragm to the through output end.
Illustratively, in the structure shown in fig. 24, the second sub-output assembly 242 includes a third movable mirror 131, and the third movable mirror 131 is disposed on the optical path between the target filter diaphragm and the transmission output end. After the incident angle is changed to the target value, the transmitted light of the output light of the first input light at the target filter film is output to the third movable mirror 131. The third movable mirror 131 reflects and outputs the transmitted light to the transmission output end by rotating. For example, the control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 outputs the transmitted light to the transmission output terminal by reflection.
Illustratively, on the basis of fig. 24, the second sub-output assembly 242 further includes a second fixed mirror 143, see fig. 25. The second fixed reflecting mirror 143 is disposed on the optical path between the third movable reflecting mirror 131 and the transmission output end, and the third movable reflecting mirror 131 is disposed on the optical path between the second fixed reflecting mirror 143 and the target filter diaphragm. After the incident angle is changed to the target value, the transmitted light of the output light of the first input light at the target filter film is output to the third movable mirror 131. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects and outputs the transmitted light to the second fixed mirror 143. The second fixed mirror 143 reflects the transmitted light to the transmission output terminal.
It should be noted that the structure of the first sub-output assembly 241 and the second sub-output assembly 242 described above is only an exemplary structure. The number of movable mirrors included in the first sub-output assembly 241 is not limited in the embodiment of the present application. For example, the first sub-output assembly 241 may be implemented by using a plurality of movable mirrors, or may be implemented by using one movable mirror and one fixed mirror. The number of the movable mirrors and the fixed mirrors included in the second sub-output assembly 242 is not limited in the embodiment of the present application. For example, the second sub-output assembly 242 may be implemented using a plurality of movable mirrors and a plurality of fixed mirrors.
For example, the target filtering diaphragm has different filtering bandwidths for the light with the same wavelength and different polarizations, and in order to make the filtering bandwidth of the light with the same wavelength in the first input light the same at the target filtering diaphragm, the first input light is converted into the light with a single polarization, and accordingly, the structure of the optical add/drop multiplexer shown in fig. 26 is provided.
In the optical add/drop multiplexer shown in fig. 26, the first input module 21 further includes a first polarization beam splitting module 113, the first sub-output module 241 further includes a first polarization beam combining module 142, and the second sub-output module 242 further includes a second polarization beam combining module 133.
Illustratively, when the first input assembly 21 includes the first movable mirror 111 and the first fixed mirror 112, the first polarization beam splitting assembly 113 is disposed on the optical path between the pass-through input end and the first fixed mirror 112.
Illustratively, when the first sub-output assembly 241 includes the second movable mirror 141, the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end.
Illustratively, when the second sub-output assembly 242 includes the third movable reflecting mirror 131 and the second fixed reflecting mirror 143, the second polarization beam combining assembly 133 is disposed on the optical path between the third movable reflecting mirror 131 and the transmission output end. For example, the second polarization beam combiner 133 is disposed on the optical path between the second fixed mirror 143 and the transmission output end.
It should be noted that when the transflective film 22 is located in the output light path of the first input module 21, the existence of the first polarization beam splitting element 113, the first polarization beam combining element 142 and the second polarization beam combining element 133 has no influence, that is, the first polarization beam splitting element 113, the first polarization beam combining element 142 and the second polarization beam combining element 133 are not provided. The control component can therefore move the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 out of the optical path when the transflective film 22 is in the output optical path of the first input assembly 21, and move the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam combining assembly 133 into the optical path when the target filtering film is in the output optical path of the first input assembly 21. Of course, for simplifying the control, the movement may not be performed, and when the total reflection diaphragm 22 or the target filtering diaphragm is located in the output optical path of the first input module 21, the first polarization beam splitting module 113, the first polarization beam combining module 142 and the second polarization beam combining module 133 are all in the optical path.
The example is described here with the target filter diaphragm in the output optical path of the first input assembly 21 (when the total reflection diaphragm 22 is in the output optical path, there is no transmitted light). After the incident angle is changed to the target value, when the first input light passes through the first polarization beam splitting assembly 113, the first polarization beam splitting assembly 113 performs polarization beam splitting on the first input light to obtain first single polarization light. The first movable mirror 111 reflects the first single polarized light to the target filter film. The target filter film transmits and reflects the first single polarized light. The reflected light of the first single polarization is output to the second movable mirror 141, and the second movable mirror 141 reflects the reflected light and outputs the reflected light to the first polarization beam combining element 142. The first polarization beam combining component 142 performs polarization beam combining on the reflected light to obtain a first polarization combined beam, and outputs the first polarization combined beam to the through output end.
The transmitted light of the first single polarization is output to the third movable mirror 131. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects and outputs the transmitted light to the second polarization beam combiner 133. The second polarization beam combining assembly 133 performs polarization beam combining on the transmission light to obtain a second polarization beam combining light, and outputs the second polarization beam combining light to the transmission output end.
Therefore, the first input light is converted into the single polarized light and enters the target filtering diaphragm, so that the first input light has the same optical filtering bandwidth for the same wavelength when passing through the target filtering diaphragm. And finally, when the polarized light is output to the through output end, the single polarized light is converted into the polarized beam combination light, so that the light output by the through output end is the polarized beam combination light. And finally, when the polarized light is output to the transmission output end, the single polarized light is converted into polarized combined light, so that the light output by the transmission output end is the polarized combined light.
Illustratively, the different polarization states of light of the same wavelength differ in the filter bandwidth of the filter diaphragm, and in order to continuously vary the filter bandwidth of the output light of the first input light at the target filter diaphragm, the optical add/drop multiplexer further comprises a first movable half-wave plate 15. The first movable half-wave plate 15 is disposed on the optical path between the first polarization beam splitting assembly 113 and the target filter membrane. The control member is connected to the first movable half-wave plate 15. Optionally, the first movable half-wave plate 15 may be moved out of the optical path when the total reflection diaphragm 22 is in the output optical path of the first input assembly 21, and the first movable half-wave plate 15 may be moved into the optical path again when the target filtering diaphragm is in the output optical path.
The control part controls the first movable half-wave plate 15 to rotate, and changes the polarization state of the first single-polarized light when the first single-polarized light passes through the first movable half-wave plate 15. Illustratively, when the transmission wavelength of the target filter diaphragm is the target wavelength, the control part determines the rotation angle corresponding to the target wavelength, and the control part controls the first movable half-wave plate 15 to rotate the rotation angle. Here, the control unit determines the rotation angle corresponding to the target wavelength by: the control unit determines the rotation angle corresponding to the target wavelength from the correspondence between the rotation angle and the wavelength, and the correspondence may be stored in a memory of the control unit or a storage accessible to the control unit. Thus, the polarization state of the first single polarized light can be adjusted by controlling the rotation of the first movable half-wave plate 15, and the continuous change of the filtering bandwidth can be realized.
In this way, in the process of adjusting the lower wavelength, the total reflection diaphragm 22 moves into the output optical path of the first input assembly 21, the first input light is incident to the total reflection diaphragm 22 and is totally reflected, and is output to the through output end, so that not only can the lower wavelength be automatically adjusted, but also the loss of the first input light can be reduced. After the lower wavelength is adjusted to the target wavelength, the target filtering diaphragm moves into the output optical path of the first input module 21, the first input light is incident to the target filtering diaphragm, light with the target wavelength in the first input light is transmitted through the target filtering diaphragm and output to the transmission output end, and light with other wavelengths in the first input light is reflected by the target filtering diaphragm and output to the through output end for being received by other devices.
The structure of the optical add/drop multiplexer as a multiplexing device is described below.
Fig. 27 shows a structure of an optical add/drop multiplexer as a multiplexing device. In the configuration shown in fig. 27, the optical add/drop multiplexer comprises a first input block 21, a totally-inverted diaphragm 22, at least one first filtering diaphragm 23 and a first output block 24. The structure shown in fig. 27 is described with reference to fig. 21, and will not be described in detail here. In fig. 27, a dotted line with an arrow indicates that no upwave input light is input at the upwave input end.
An optical add/drop multiplexer as described hereinbefore comprises a through input, a through output and an add input.
Illustratively, in the configuration shown in FIG. 28, the first input assembly 21 includes a first sub-input assembly 211 and a second sub-input assembly 212. The first sub-input assembly 211 is disposed on the light path between the through input end and the splicing membrane, and the second sub-input assembly 212 is disposed on the light path between the upwave input end and the splicing membrane.
In the exemplary configuration shown in fig. 28, the case of adjusting the wavelength of the upper wave of the optical add/drop multiplexer from the first wavelength to the target wavelength will be described. In the process of adjusting the wavelength of the add/drop multiplexer to the target wavelength, the wavelength of the add/drop multiplexer is adjusted by adjusting the incident angle, which is the target value corresponding to the target wavelength as described above.
During the change of the incident angle, the total reflection diaphragm 22 moves into the output optical path of the first sub-input assembly 211. For example, the control component controls the splicing diaphragm to move, moving the total reflection diaphragm 22 into the output optical path of the first sub-input assembly 211. The through input end inputs the first input light, the first sub-input assembly 211 receives the first input light, outputs the output light of the first input light to the total reflection membrane 22, and the incident angle is changed to a target value. The total reflection diaphragm 22 totally reflects the output light of the first input light to the first output assembly 24. The first output assembly 24 reflects light reflected by the totally reflecting diaphragm 22 out to the through output. This process is realized by the control section performing synchronous control of the first sub-input block 211 and the first output block 24, for example.
After the incident angle is changed to a target value, first input light is input into the through input end, the first input light does not include light with a target wavelength, second input light is input into the upwave input end, and the wavelength of the second input light is the target wavelength. The control component controls the splicing diaphragms to move, and a target filtering diaphragm in at least one first filtering diaphragm 23 is moved into an output optical path of the first sub-input assembly 211, wherein the target filtering diaphragm is the first filtering diaphragm 23 corresponding to the target wavelength. The target filter membrane totally reflects the first input light, and the reflected light of the first input light is output to the first output assembly 24. The control unit controls the second sub-input module 212, and the second sub-input module 212 outputs the output light of the second input light to the target filtering diaphragm, and the incident angle is a target value. At this point, the target filter diaphragm transmits the second input light, and the transmitted light of the second input light is output to the first output assembly 24. The first output assembly 24 outputs the transmitted light and the reflected light of the first input light to the through output terminal.
Illustratively, in the configuration shown in fig. 28, the first sub-input assembly 211 includes a first movable mirror 111, and the first movable mirror 111 is disposed on the optical path between the feed-through input end and the spliced diaphragm. In the incident angle changing process, the control section controls the first movable mirror 111 to rotate, and the first movable mirror 111 changes the incident angle of the output light of the first input light at the total reflection diaphragm 22 to a target value. For example, the control unit can control the first movable mirror 111 to rotate at a constant speed, so as to change the incident angle of the output light of the first input light on the total reflection diaphragm 22 to a target value. After the incident angle changes to the target value, the first movable mirror 111 stops rotating, the first movable mirror 111 makes the output light of the first input light incident on the target filter membrane, and the incident angle is the target value.
Illustratively, in the structure shown in fig. 28, the second sub-input assembly 212 includes a third movable mirror 131, and the third movable mirror 131 is disposed on the optical path between the add input end and the spliced diaphragm. After the incident angle is changed to the target value, the second input light is input from the upwave input end, and the third movable mirror 131 receives the second input light. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects the second input light to the target filter membrane, and the incident angle is the target value. The target filter diaphragm is fully transmissive to the second input light and outputs to the first output component 24.
Illustratively, the second sub-input assembly 212 further includes a third fixed mirror 135, see fig. 28. The third fixed reflecting mirror 135 is disposed on the optical path between the third movable reflecting mirror 131 and the upper wave input end, and the third movable reflecting mirror 131 is disposed on the optical path between the third fixed reflecting mirror 135 and the patch film. The second input light is incident on the third fixed mirror 135. The third fixed mirror 135 reflects the second input light to the third movable mirror 131. The control unit controls the third movable mirror 131 to rotate, and the third movable mirror 131 makes the second input light incident on the target filter membrane at the target angle. The transmitted light of the second input light, after passing through the target filter diaphragm, is transmitted to the first output assembly 24. The first output assembly 24 outputs the transmitted light to a through output. Thus, the up wave function is realized.
In this way, in the structure shown in fig. 28, the first sub-input assembly 211 includes the first movable mirror 111, and can change the incident angle of the first input light to the target filtering diaphragm, thereby realizing the adjustment of the transmission wavelength of the first input light at the target filtering diaphragm. The second sub-input assembly 212 includes a third movable mirror 131, and enables adjustment of the up-wavelength.
It should be noted that the structure of the first sub-input assembly 211 and the second sub-input assembly 212 described above is only an exemplary structure. The number of movable mirrors included in the first sub-input assembly 211 is not limited in the embodiments of the present application. For example, the first sub-input assembly 211 may be implemented using a plurality of movable mirrors. For another example, the first sub-input assembly 211 may be implemented using a plurality of movable mirrors and a plurality of fixed mirrors. The second sub-input assembly 212 includes no limitation on the number of movable mirrors and fixed mirrors. For example, the second sub-input assembly 212 may be implemented using a plurality of movable mirrors and a plurality of fixed mirrors.
Illustratively, the first output assembly 24 includes a second movable mirror 141, see fig. 27, the second movable mirror 141 being disposed on the optical path between the spliced membranes and the pass-through output.
During the incident angle changing process, the control unit controls the second movable mirror 141 to rotate, and the second movable mirror 141 reflects the first input light reflected by the total reflection diaphragm 22 to the through output end. Thus, since the transmission direction of the reflected light of the first input light on the total reflection film 22 is changed by the rotation of the first movable mirror 111, the rotation of the second movable mirror 141 is matched with the first movable mirror 111.
After the incident angle changes to the target value, the second movable mirror 141 stops rotating, and the second movable mirror 141 outputs the reflected light of the first input light on the target filter diaphragm to the through output end. If the second input light is input at the up-wave input end, the second movable mirror 141 outputs the transmission light of the second input light on the target filter diaphragm to the through output end.
Illustratively, the first output member 24 further includes a second fixed mirror 143, see fig. 28. The second fixed mirror 143 is disposed on the optical path between the second movable mirror 141 and the through output terminal. In the process of changing the incident angle, the control unit controls the second movable reflecting mirror 141 to rotate, and the second movable reflecting mirror 141 outputs the reflected light of the output light of the first input light on the total reflection diaphragm 22 to the second fixed reflecting mirror 143. The second fixed mirror 143 reflects the light reflected by the second movable mirror 141 to the through output terminal. After the incident angle is changed to the target value, the second movable mirror 141 outputs the reflected light of the first input light on the target filter diaphragm to the second fixed mirror 143. The second fixed mirror 143 reflects the reflected light to the through output terminal. If the second input light is inputted at the up wave input end, the second movable mirror 141 reflects the transmission light of the second input light on the target filter diaphragm to output to the second fixed mirror 143. The transmitted light is reflected by the second fixed mirror 143 to the through output.
Illustratively, the first output component 24 further includes at least one lens 114, see fig. 29, where the at least one lens 114 is disposed within the optical path scanning range between the second movable mirror 141 and the spliced membranes. The at least one lens 114 is a convex lens, the at least one lens 114 being configured to focus the first input light and to focus the second input light.
It should be noted that the structure of the first output member 24 described above is only an exemplary structure, and the number of movable mirrors, fixed mirrors, and lenses included in the first output member 24 is not limited in the embodiments of the present application.
For example, the target filtering diaphragm has different filtering bandwidths for the light with the same wavelength and different polarizations, and in order to make the filtering bandwidth of the light with the same wavelength in the first input light the same at the target filtering diaphragm, the first input light is converted into the light with a single polarization, and accordingly, the structure of the optical add/drop multiplexer shown in fig. 30 is provided.
In the optical add/drop multiplexer shown in fig. 30, the first sub-input block 211 includes the first polarization beam splitting block 113, the first output block 24 further includes the first polarization beam combining block 142, and the second sub-input block 212 further includes the second polarization beam splitting block 134.
Illustratively, when the first sub-input assembly 211 includes the first movable mirror 111, the first polarization beam splitting assembly 113 is disposed on the optical path between the pass-through input end and the first movable mirror 111.
Illustratively, when the second output assembly 24 includes the second movable mirror 141, the first polarization beam combining assembly 142 is disposed on an optical path between the second movable mirror 141 and the through output end.
Illustratively, when the second sub-input assembly 212 includes the third movable mirror 131, the second polarization beam splitting assembly 134 is disposed on the optical path between the upwave input end and the third movable mirror 131. When the second sub-input assembly 212 includes the third movable mirror 131 and the third fixed mirror 135, the second polarization beam splitting assembly 134 is disposed on the optical path between the upper wave input end and the third fixed mirror 135.
It is noted that when the total reflection film 22 is located in the output optical path of the first input assembly 21, whether the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam splitting assembly 134 exist or not is not affected, that is, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam splitting assembly 134 are not provided. The control component can therefore move the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 out of the optical path when the total reflection diaphragm 22 is in the output optical path of the first input assembly 21, and move the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142, and the second polarization beam splitting assembly 134 into the optical path when the target filtering diaphragm is in the output optical path of the first input assembly 21. Of course, for simplicity of control, the movement can also be omitted, and when the total reflection diaphragm 22 or the target filtering diaphragm is located in the output optical path of the first input assembly 21, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam splitting assembly 134 are all located in the optical path.
The example is described here where the target filter diaphragm is in the output optical path of the first input element 21 (when the total reflection diaphragm 22 is in the output optical path, there is no transmitted light). After the incident angle is changed to the target value, when the first input light passes through the first polarization beam splitting assembly 113, the first polarization beam splitting assembly 113 performs polarization beam splitting on the first input light, and a first single polarization light is obtained. The first movable mirror 111 reflects the first single-polarized light to the target filter film. The target filter film reflects the first single polarized light. The reflected light of the first single polarization is output to the second movable mirror 141, and the second movable mirror 141 outputs the reflected light to the first polarization beam combiner 142. The first polarization beam combining component 142 performs polarization beam combination on the reflected light to obtain a first polarization beam combination light, and outputs the first polarization beam combination light to the through output end.
When the second input light passes through the second polarization beam splitting assembly 134, the second polarization beam splitting assembly 134 performs polarization beam splitting on the second input light to obtain second single-polarization light. The third movable mirror 131 reflects the second single polarized light to the target filter film, and the incident angle is the target value. The target filtering diaphragm transmits the second single polarized light. The transmitted light of the second single polarization is incident on the second movable mirror 141, and the second movable mirror 141 outputs the transmitted light to the first polarization beam combiner 142. The first polarization beam combining component 142 performs polarization beam combination on the transmission light to obtain a third polarization beam combination light, and outputs the third polarization beam combination light to the through output end.
In this way, the second input light is converted into single-polarization light and is incident to the target filtering diaphragm, so that the optical filtering bandwidths for the same wavelength are the same when the second input light passes through the target filtering diaphragm. And the light output by the direct output end is also the polarized combined light, so that the transmission is not influenced.
It should be noted here that after the incident angle is changed to the target value, the first input light does not include the light of the target wavelength, so the first input light is not transmitted through the target filter film. The existence of the first polarization beam splitting assembly 113 does not affect the transmission of the first input light on the target filtering film, but the first polarization beam splitting assembly 113 is still arranged, because: since the first input light is finally outputted through, and is polarization-combined by the first polarization beam-combining component 142, polarization beam splitting is performed before the first input light is outputted.
Illustratively, different polarization states of light of the same wavelength are different at the filter bandwidth of the target filter diaphragm, and the optical add/drop multiplexer further includes a second movable half-wave plate 16 in order to continuously change the filter bandwidth of the second input light at the target filter diaphragm. The second movable half-wave plate 16 is disposed on the optical path between the second polarization beam splitting assembly 134 and the third movable mirror 131.
The control means controls the second movable half-wave plate 16 to rotate, and changes the polarization state of the second single-polarized light when the second single-polarized light passes through the second movable half-wave plate 16. Illustratively, when the transmission wavelength of the target filter diaphragm is the target wavelength, the control component determines a rotation angle corresponding to the target wavelength, and the control component controls the second movable half-wave plate 16 to rotate by the rotation angle. Here, the control section determines the rotation angle in such a manner that: the control unit determines the rotation angle corresponding to the target wavelength from the correspondence between the rotation angle and the wavelength, and the correspondence may be stored in a memory of the control unit or a storage accessible to the control unit. Thus, the polarization state of the second single polarized light can be adjusted by controlling the second movable half-wave plate 16 to rotate, and the continuous adjustment of the filter bandwidth can be realized.
Thus, when the optical add/drop multiplexer is used as a wave-combining device, the wave-up wavelength can be automatically adjusted. In addition, in the process of automatically adjusting the upper wave wavelength, the total reflection diaphragm 22 is arranged, so that the loss of the input light which is directly transmitted to the input end can be reduced. When the target wavelength is adjusted, the target filtering diaphragm is arranged, so that the upper wave input end can be subjected to upper wave processing. And because the half-wave plate is arranged, the filtering bandwidth of the upwave input light on the filtering diaphragm can be continuously changed.
When the optical add/drop multiplexer is a wavelength division device or a wavelength combiner, the control unit controls the first movable mirror 111 and the second movable mirror 141 to rotate synchronously during the change of the incident angle. Illustratively, the control section acquires the rate, direction, and magnitude of rotation of the first movable mirror 111 and the second movable mirror 141, and controls the first movable mirror 111 and the second movable mirror 141 in accordance with the rate, direction, and magnitude. After the incident angle is changed to the target value, the first movable mirror 111 and the second movable mirror 141 are both rotated to the corresponding positions, and do not need to be rotated. When the optical add/drop multiplexer is used as a wavelength division device, the first controller 13 may control the third movable mirror 131 to output the transmitted light of the first input light on the target filtering diaphragm to the transmission output end. When the optical add/drop multiplexer is used as the multiplexer, the first controller 13 may control the third movable mirror 131 to input the second input light. Illustratively, the control section acquires the rate, direction, and magnitude of rotation of the third movable mirror 131, and controls the third movable mirror 131 in accordance with the rate, direction, and magnitude.
In addition, in the embodiment of the present application, a relationship curve of the rotation angle of the movable half-wave plate and the filter bandwidth is also provided exemplarily, see fig. 31. In fig. 31, the horizontal axis represents rotation angle in degrees, and the vertical axis represents filter bandwidth in nm. The filter bandwidth here is a 3dB filter bandwidth.
It should be noted that, when the optical add/drop multiplexer is used as a wavelength division device, the through input end, the through output end, and the transmission output end of the optical add/drop multiplexer are all provided with coupling mirrors, and the coupling mirrors are connected with the optical fiber. The coupling mirror of the through input is for coupling the first input light into the optical add/drop multiplexer. The coupling mirror of the through output end is used for coupling the light output by the optical add/drop multiplexer into an optical fiber for transmission. The coupling mirror at the transmission output end is used for coupling the light output by the optical add/drop multiplexer into an optical fiber for transmission.
When the optical add/drop multiplexer is used as a wave combining device, the straight-through input end, the straight-through output end and the wave-up input end of the optical add/drop multiplexer are respectively provided with a coupling mirror, and the coupling mirrors are connected with optical fibers. The coupling mirror of the through input is for coupling the first input light into the optical add/drop multiplexer. The coupling mirror at the through output end is used for coupling the light output by the optical add/drop multiplexer into an optical fiber for transmission. The coupling mirror at the add input is for coupling the second input light to the optical add/drop multiplexer.
It should be noted that, in the embodiments of the present application, the control of the movable mirror is realized by controlling the MEMS on the movable mirror, and the control of the movable half-wave plate can also be realized by controlling the MEMS on the movable half-wave plate. This is only one implementation manner of the embodiment of the present application, and the embodiment of the present application does not limit this.
The above description is only one embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (24)

1. An optical add/drop multiplexer, characterized in that it comprises an input module (11), a filter membrane (12), a transmissive loopback module (13) and an output module (14);
the input assembly (11) is used for receiving first input light, and adjusting the incident angle of the output light of the first input light incident to the filter membrane (12) in the process of adjusting the lower wave wavelength or the upper wave wavelength to a target wavelength;
the transmission loopback component (13) is used for receiving first transmission light of output light of the first input light at the filtering diaphragm (12) and outputting the first transmission light to the output component (14);
the output assembly (14) is used for receiving first reflected light and first transmitted light of output light of the first input light on the filtering diaphragm (12) and carrying out through output on the first reflected light and the first transmitted light.
2. An optical add/drop multiplexer according to claim 1, wherein the optical add/drop multiplexer is a wavelength division device; after the incident angle is adjusted to a target value corresponding to the target wavelength, the transmission loopback component (13) is used for receiving second transmission light of the output light of the first input light on the filtering diaphragm (12) and transmitting and outputting the second transmission light;
the output assembly (14) is used for receiving second reflected light of the output light of the first input light on the filtering diaphragm (12) and outputting the second reflected light in a through mode.
3. An optical add/drop multiplexer according to claim 1, wherein the optical add/drop multiplexer is a wave-combining device; after the incident angle is adjusted to a target value corresponding to the target wavelength, the transmission loopback component (13) is configured to receive second input light, and the second input light is incident to the filter membrane (12) according to the incident angle as the target value, where the wavelength of the second input light is the target wavelength;
the output assembly (14) is used for receiving second reflected light of the output light of the first input light on the filtering diaphragm (12) and third transmitted light of the second input light on the filtering diaphragm (12), and carrying out through output on the second reflected light and the third transmitted light.
4. An optical add/drop multiplexer according to any of claims 1 to 3, wherein the input assembly (11) comprises a first movable mirror (111);
the first movable reflecting mirror (111) is used for receiving the first input light and adjusting the incident angle of the output light of the first input light to the filtering diaphragm (12) through rotation in the process of adjusting the lower wave wavelength or the upper wave wavelength to the target wavelength;
after the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable mirror (111) is configured to receive the first input light and make output light of the first input light incident on the filter membrane (12).
5. An optical add/drop multiplexer according to claim 4, wherein said input assembly (11) further comprises a first fixed mirror (112);
the first movable reflector (111) is arranged on a light path between the first fixed reflector (112) and the filter membrane (12);
the first fixed mirror (112) is configured to receive the first input light and reflect the first input light to the first movable mirror (111).
6. An optical add/drop multiplexer according to claim 2, wherein said output assembly (14) comprises a second movable mirror (141);
the second movable reflecting mirror (141) is used for receiving the first reflected light and the first transmitted light in the process of adjusting the lower wavelength to the target wavelength, and outputting the first reflected light and the first transmitted light in a through way through rotation;
and after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector (141) is used for receiving the second reflected light and outputting the second reflected light in a straight-through manner.
7. An optical add/drop multiplexer according to claim 2 or 6, wherein said transmissive loopback assembly (13) comprises a third movable mirror (131) and a fourth movable mirror (132);
the third movable reflecting mirror (131) and the fourth movable reflecting mirror (132) are used for receiving the first transmitted light and outputting the first transmitted light to the output component (14) through rotation in the process of adjusting the lower wavelength to the target wavelength;
and after the incidence angle is adjusted to a target value corresponding to the target wavelength, the third movable reflector (131) is used for receiving the second transmitted light and transmitting and outputting the second transmitted light through rotation.
8. An optical add/drop multiplexer according to any of claims 1 to 7, wherein the optical add/drop multiplexer is a wavelength division device; the input assembly (11) comprises a first polarizing beam splitting assembly (113); the output assembly (14) comprises a first polarization beam combining assembly (142); the transmissive loopback component (13) comprises a second polarization beam combining component (133);
the first polarization beam splitting component (113) is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the filtering membrane (12) to form single polarization light;
the first polarization beam combination component (142) is used for carrying out polarization beam combination on the light of the through output to form dual-polarization light before the through output;
the second polarization beam combination component (133) is used for carrying out polarization beam combination on the transmitted and output light to form dual-polarization light before the transmitted and output light.
9. An optical add/drop multiplexer according to claim 8, further comprising a first movable half-wave plate (15); the first movable half-wave plate (15) is arranged on an optical path between the filtering diaphragm (12) and the first polarization beam splitting assembly (113);
the first movable half-wave plate (15) is used for changing the polarization state of the first input light after polarization beam splitting through rotation.
10. An optical add/drop multiplexer according to claim 3, wherein said output assembly (14) comprises a second movable mirror (141);
the second movable reflecting mirror (141) is used for receiving the first reflected light and the first transmitted light and outputting the first reflected light and the first transmitted light in a straight-through manner through rotation in the process of adjusting the upper wavelength to a target wavelength;
and after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector (141) is used for receiving the second reflected light and the third transmitted light and outputting the second reflected light and the third transmitted light in a straight-through manner.
11. An optical add/drop multiplexer according to claim 3 or 10, wherein said transmissive loopback assembly (13) comprises a third movable mirror (131) and a fourth movable mirror (132);
the third movable reflecting mirror (131) and the fourth movable reflecting mirror (132) are used for receiving the first transmitted light and outputting the first transmitted light to the output component (14) through rotation in the process of adjusting the upper wavelength to the target wavelength;
after the incident angle is adjusted to a target value corresponding to the target wavelength, the third movable mirror (131) is configured to receive second input light, and the second input light is incident to the filter membrane (12) according to the incident angle serving as the target value.
12. An optical add/drop multiplexer according to claim 10 or 11, wherein said input assembly (11) comprises a first polarization splitting assembly (113); the output assembly (14) comprises a first polarization beam combining assembly (142); the transmissive loopback assembly (13) comprises a second polarizing beam splitting assembly (134);
the first polarization beam splitting component (113) is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the filtering membrane (12) to form single polarization light;
the second polarization beam splitting component (134) is used for carrying out polarization beam splitting on the second input light before the second input light is incident to the filtering diaphragm (12) to form single polarization light;
the first polarization beam combining component (142) is used for carrying out polarization beam combination on the light output by the filtering membrane (12) into dual-polarization light before outputting.
13. An optical add/drop multiplexer according to claim 12, further comprising a second movable half-wave plate (16); the second movable half-wave plate (16) is arranged on the optical path between the filter membrane (12) and the second polarization beam splitting assembly (134);
the second movable half-wave plate (16) is used for changing the polarization state of the second input light after polarization beam splitting through rotation.
14. An optical add/drop multiplexer, characterized in that it comprises a first input block (21), a totally reflecting diaphragm (22), at least one first filtering diaphragm (23) and a first output block (24); the filter bandwidth of each first filter diaphragm (23) is different;
the first input assembly (21) is used for receiving first input light, and adjusting the incident angle of output light of the first input light incident to the total reflection diaphragm (22) in the process of adjusting the lower wave wavelength or the upper wave wavelength to a target wavelength;
after the incident angle is adjusted to a target value corresponding to the target wavelength, a target filtering diaphragm of the at least one first filtering diaphragm (23) moves into an output optical path of the first input assembly (21), and the total reflection diaphragm (22) moves out of the output optical path of the first input assembly (21); the target filtering diaphragm is used for transmitting light with the target wavelength in the output light of the first input light;
the first output assembly (24) is used for outputting the light output by the total reflection diaphragm (22) and the target filtering diaphragm.
15. An optical add/drop multiplexer according to claim 14, wherein the optical add/drop multiplexer is a wavelength division device; the first input assembly (21) comprises a first movable mirror (111);
the first movable reflecting mirror (111) is used for receiving the first input light in the process of adjusting the wavelength of a lower wave to a target wavelength, and adjusting the incidence angle of the output light of the first input light to the total reflection diaphragm (22) through rotation;
after the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable mirror (111) is configured to receive the first input light, and to make the output light of the first input light incident on the target filtering diaphragm.
16. An optical add/drop multiplexer according to claim 15, wherein said first output assembly (24) comprises a first sub-output assembly (241) and a second sub-output assembly (242);
the first sub-output assembly (241) is used for carrying out through output on the reflected light output by the total reflection diaphragm (22) in the process of adjusting the lower wave wavelength to the target wavelength;
after the incident angle is adjusted to a target value corresponding to the target wavelength, the first sub-output assembly (241) is used for directly outputting the reflected light output by the target filtering diaphragm, and the second sub-output assembly (242) is used for transmitting and outputting the transmitted light output by the target filtering diaphragm.
17. An optical add/drop multiplexer according to claim 16, wherein said first sub-output assembly (241) comprises a second movable mirror (141);
the second movable reflector (141) is used for outputting the reflected light output by the total reflection diaphragm (22) in a through way through rotation in the process of adjusting the lower wavelength to the target wavelength;
and after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector (141) is used for directly outputting the reflected light output by the target filter diaphragm.
18. An optical add/drop multiplexer according to claim 16 or 17, wherein the second sub-output assembly (242) comprises a third movable mirror (131);
and after the incident angle is adjusted to a target value corresponding to the target wavelength, the third movable reflector (131) is used for transmitting and outputting the transmission light output by the target filtering membrane through rotation.
19. An optical add/drop multiplexer according to any of claims 16 to 18, wherein the first input block (21) comprises a first polarization splitting block (113); the first sub-output assembly (241) comprises a first polarization beam combining assembly (142); the second sub-output assembly (242) comprises a second polarization beam combining assembly (133);
the first polarization beam splitting component (113) is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the target filtering film sheet to obtain single polarization light;
the first polarization beam combining component (142) is used for carrying out polarization beam combination on the reflected light output by the target filtering diaphragm into dual-polarization light before direct output;
and the second polarization beam combining component (133) is used for carrying out polarization beam combination on the transmission light output by the target filtering diaphragm into dual-polarization light before transmission output.
20. An optical add/drop multiplexer according to claim 14, wherein the optical add/drop multiplexer is a wave-combining device; the first input component (21) comprises a first sub-input component (211) and a second sub-input component (212);
the first sub-input assembly (211) is used for receiving the first input light and adjusting the incidence angle of the output light of the first input light to the total reflection membrane (22) in the process of adjusting the upper wavelength to the target wavelength;
after the incident angle is adjusted to a target value corresponding to the target wavelength, the first sub-input module (211) is configured to receive the first input light and input output light of the first input light to the target filtering diaphragm, the second sub-input module (212) is configured to receive second input light and input output light of the second input light to the target filtering diaphragm according to the incident angle as the target value, and a wavelength of the second input light is the target wavelength.
21. An optical add/drop multiplexer according to claim 20, wherein said first sub-input assembly (211) comprises a first movable mirror (111);
the first movable reflecting mirror (111) is used for receiving the first input light in the process of adjusting the upper wavelength to a target wavelength, and adjusting the incidence angle of the output light of the first input light to the total reflection diaphragm (22) through rotation;
after the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable mirror (111) is configured to receive the first input light, and to make the output light of the first input light incident on the target filtering diaphragm.
22. An optical add/drop multiplexer according to claim 20 or 21, wherein said second sub-input assembly (212) comprises a third movable mirror (131);
and the third movable reflector (131) is used for receiving the second input light, and enabling the output light of the second input light to be incident to the target filtering diaphragm according to the incidence angle as the target value through rotation.
23. An optical add/drop multiplexer according to any of claims 20 to 22, wherein said first output assembly (24) comprises a second movable mirror (141);
the second movable reflector (141) is used for outputting the reflected light output by the total reflection diaphragm (22) in a through way through rotation in the process of adjusting the upper wavelength to the target wavelength;
and after the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable reflector (141) is used for directly outputting the reflected light and the transmitted light output by the target filter membrane.
24. An optical add/drop multiplexer according to any of claims 20 to 23, wherein said first sub-input assembly (211) comprises a first polarization splitting assembly (113); the second sub-input assembly (212) comprises a second polarizing beam splitting assembly (134); the first output assembly (24) includes a first polarization beam combining assembly (142);
the first polarization beam splitting component (113) is used for carrying out polarization beam splitting on the first input light before the first input light is incident to the target filtering membrane to form single polarization light;
the second polarization beam splitting component (134) is used for carrying out polarization beam splitting on the second input light before the second input light is incident to the target filtering membrane to form single polarization light;
the first polarization beam combination component (142) is used for carrying out polarization beam combination on the directly-output light to change the light into dual-polarization light before outputting.
CN202110968203.XA 2021-08-23 2021-08-23 Optical add drop multiplexer Pending CN115712171A (en)

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WO2002086596A1 (en) * 2001-04-20 2002-10-31 Cormack Robert H Polarization insensitive tunable optical filters
KR20040016406A (en) * 2002-08-15 2004-02-21 호야 가부시키가이샤 Optical module
US7062122B2 (en) * 2002-11-05 2006-06-13 Jds Uniphase Corporation Tunable optical add/drop device
US7072540B1 (en) * 2003-04-22 2006-07-04 Raytheon Company Method of assembling a multiplexer/demultiplexer apparatus to account for manufacturing variations in the thin-film optical filters
US7352928B2 (en) * 2006-04-04 2008-04-01 Jds Uniphase Corporation Tunable optical add/drop multiplexer
CN101056153A (en) * 2006-04-14 2007-10-17 上海未来宽带技术及应用工程研究中心有限公司 Wave division multiplexer
US7821712B2 (en) * 2006-06-29 2010-10-26 Accelink Technologies Co., Ltd. Thin film tunable optical filter

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