1. A cover plate for electrical apparatus comprising:
at least one opening intended to provide access to at least one functional part of the electrical apparatus, the cover plate is formed by superimposing a rear mounting plate fitted at the back with means for mounting on an apparatus support and a front finish plate giving said cover plate an aesthetic appearance, wherein said rear mounting plate includes on its front side a recessed housing which is delimited between an inner peripheral edge (25) bordering said opening (22, 32; 122) and an outer peripheral edge (26) and which completely houses said front finish plate such that the front side of said front finish plate extends flush with or is slightly back from the front side of said rear mounting plate.
2. The cover plate according to claim 1, wherein the rear mounting plate is formed from a single piece.
3. The cover plate according to claim 1, wherein the rear mounting plate is formed by superimposing an intermediate plate and a sub-plate, the intermediate plate being equipped with a recessed housing to house said front finish plate and the sub-plate including said mounting means on the rear side.
4. The cover plate according to claim 3, wherein the sub-plate and the intermediate plate are undetachably fastened to each other.
5. The cover plate according to claim 1, wherein the inner and outer peripheral edges are covered by a coating giving said cover plate an aesthetic appearance.
6. The cover plate according to claim 5, wherein said coating is made from chromium.
7. The cover plate according to claim 1, wherein the front finish plate and the rear mounting plate are undetachably fastened to each other.
8. The cover plate according to claim 1, wherein the front finish plate and the rear mounting plate are detachably fastened to each other.
9. The cover plate according to claim 1, wherein the front finish plate has a thickness of between 0.5 and 2 millimeters, preferably between 1 and 1.5 millimeters.
10. The cover plate according to claim 1, wherein the front finish plate includes a rigid core and a skin which covers at least the front side of the rigid core to give said cover plate an aesthetic appearance.
11. The cover plate according to claim 1, wherein the front finish plate and the rear mounting plate are made from different materials.
12. The cover plate according to claim 1, wherein the rear mounting plate is made by one or more moulding operations.
13. The cover plate according to claim 1, wherein the front finish plate is made by laser cutting.
14. Electrical apparatus including an apparatus support supporting an apparatus mechanism with on the front side at least one functional part, wherein the electrical apparatus includes the cover plate according to claim 1, whose opening borders the functional part of the apparatus mechanism and whose means for mounting the rear mounting plate are mounted in arrangements of the apparatus support.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical multiplexer, configured to multiplex at least four optical signals into one optical signal, and comprising:
a first polarization state adjusting component;
a second polarization state adjusting component;
a first optical path changing component;
a second optical path changing component;
a polarization beam combiner; and
a beam combiner,
wherein:
the first polarization state adjusting component is configured to adjust a polarization state of a first optical signal in the at least four optical signals before the first optical signal is input into the polarization beam combiner;
the second polarization state adjusting component is configured to adjust a polarization state of a second optical signal in the at least four optical signals before the second optical signal is input into the polarization beam combiner;
the first optical path changing component is configured to change a propagation direction of a third optical signal in the at least four optical signals, the third optical signal in a different polarization state than the polarization state of the first optical signal, and a propagation direction of a fourth optical signal in the at least four optical signals, the fourth optical signal in a different polarization state than the polarization state of the second optical signal, so that the third and fourth optical signals in the different polarization states than the polarization states of the first and second optical signals are input into the polarization beam combiner;
the polarization beam combiner is configured to combine the first and third optical signals that are received in the different polarization states to obtain a fifth optical signal, and is further configured to combine the second and fourth optical signals that are received in the different polarization states to obtain a sixth optical signal;
the second optical path changing component is configured to change a propagation direction of the fifth optical signal or a propagation direction of the sixth optical signal output by the polarization beam combiner, so that the fifth optical signal and the sixth optical signal are combined by the beam combiner into one optical signal after being input into the beam combiner; and
the beam combiner is configured to combine the fifth optical signal and the sixth optical signal that are received into one optical signal.
2. The optical multiplexer according to claim 1, wherein the first polarization state adjusting component and the second polarization state adjusting component are half-wave plates.
3. The optical multiplexer according to claim 1, wherein the optical multiplexer further comprises a third polarization state adjusting component and a fourth polarization state adjusting component, wherein
the third polarization state adjusting component is configured to adjust a polarization state of the third optical signal to a different polarization state than the polarization state of the first optical signal before the third optical signal is input into the polarization beam combiner, so that the third optical signal in the adjusted polarization state and the first optical signal in the adjusted polarization state are combined into one optical signal in the polarization beam combiner; and
the fourth polarization state adjusting component is configured to adjust a polarization state of the fourth optical signal to a different polarization state than the polarization state of the second optical signal before the fourth optical signal is input into the polarization beam combiner, so that the fourth optical signal in the adjusted polarization state and the second optical signal in the adjusted polarization state are combined into one optical signal in the polarization beam combiner.
4. The optical multiplexer according to claim 3, wherein the first polarization state adjusting component and the second polarization state adjusting component are \xbc-wave plates, and the third polarization state adjusting component and the fourth polarization state adjusting component are \xbe-wave plates.
5. The optical multiplexer according to claim 1, further comprising:
a first collimating component, configured to collimate the first optical signal before the first optical signal is input into the polarization beam combiner;
a second collimating component, configured to collimate the second optical signal before the second optical signal is input into the polarization beam combiner;
a third collimating component, configured to collimate the third optical signal before the third optical signal is input into the polarization beam combiner; and
a fourth collimating component, configured to collimate the fourth optical signal before the fourth optical signal is input into the polarization beam combiner.
6. The optical multiplexer according to claim 1, further comprising an optical isolator, wherein the optical isolator is located behind the beam combiner and located on an optical path of an optical signal output by the beam combiner.
7. An optical multiplexer, configured to multiplex at least four optical signals into one optical signal, and comprising at least:
a first polarization state adjusting component,
a second polarization state adjusting component,
a first optical path changing component,
a second optical path changing component,
a third optical path changing component,
a first polarization beam combiner,
a second polarization beam combiner, and
a beam combiner,
wherein:
the first polarization state adjusting component is configured to adjust a polarization state of a first optical signal in the at least four optical signals before the first optical signal is input into the polarization beam combiner;
the second polarization state adjusting component is configured to adjust a polarization state of a third optical signal in the at least four optical signals before the third optical signal is input into the polarization beam combiner;
the first optical path changing component is configured to change a propagation direction of a second optical signal in the at least four optical signals, the second optical signal in a different polarization state than the polarization state of the first optical signal, so that the signal is input into the first polarization beam combiner;
the second optical path changing component is configured to change a propagation direction of the fourth optical signal in the at least four optical signals, a fourth optical signal in a different polarization state than the polarization state of the third optical signal, so that the signal is input into the second polarization beam combiner;
the first polarization beam combiner is configured to combine the first optical signal and the second optical signal that are received in different polarization states, and output a fifth optical signal;
the second polarization beam combiner is configured to combine the third optical signal and the fourth optical signal that are received in different polarization states, and output a sixth optical signal;
the third optical path changing component is configured to change a propagation direction of the fifth optical signal or a propagation direction of the sixth optical signal, so that the fifth optical signal and the sixth optical signal are combined by the beam combiner into one optical signal after being input into the beam combiner; and
the beam combiner is configured to combine the fifth optical signal and the sixth optical signal that are received into one optical signal.
8. The optical multiplexer according to claim 7, wherein the first polarization state adjusting component and the second polarization state adjusting component are half-wave plates.
9. The optical multiplexer according to claim 7, wherein the optical multiplexer further comprises a third polarization state adjusting component and a fourth polarization state adjusting component;
the third polarization state adjusting component is configured to adjust a polarization state of the second optical signal to a different polarization state than the polarization state of the first optical signal before the second optical signal is input into the polarization beam combiner, so that the second optical signal in the adjusted polarization state and the first optical signal in the adjusted polarization state are combined into one optical signal in the first polarization beam combiner; and
the fourth polarization state adjusting component is configured to adjust a polarization state of the fourth optical signal to a different polarization state than the polarization state of the third optical signal before the fourth optical signal is input into the polarization beam combiner, so that the fourth optical signal in the adjusted polarization state and the third optical signal in the adjusted polarization state are combined into one optical signal in the second polarization beam combiner.
10. The optical multiplexer according to claim 9, wherein the first polarization state adjusting component and the second polarization state adjusting component are \xbc-wave plates, and the third polarization state adjusting component and the fourth polarization state adjusting component are \xbe-wave plates.
11. The optical multiplexer according to claim 7, further comprising:
a first collimating component, configured to collimate the first optical signal before the first optical signal is input into the polarization beam combiner;
a second collimating component, configured to collimate the second optical signal before the second optical signal is input into the polarization beam combiner;
a third collimating component, configured to collimate the third optical signal before the third optical signal is input into the polarization beam combiner; and
a fourth collimating component, configured to collimate the fourth optical signal before the fourth optical signal is input into the polarization beam combiner.
12. The optical multiplexer according to claim 7, further comprising an optical isolator, wherein the optical isolator is located behind the beam combiner and located on an optical path of an optical signal output by the beam combiner.
13. An optical signal multiplexing method to multiplex at least four optical signals into one optical signal, comprising:
adjusting a polarization state of a first optical signal in the at least four optical signals to be in a different polarization state than a second optical signal in the at least four optical signals, so that the polarization state of the second optical signal is mutually orthogonal to the polarization state of the first optical signal in the adjusted polarization state, before combining the first optical signal in the adjusted polarization state and the second optical signal in the adjusted polarization state through polarization multiplexing in the different polarization states into one optical signal;
adjusting a polarization state of a third optical signal in the at least four optical signals to be in a different polarization state than a fourth optical signal in the at least four optical signals, so that the polarization state of the fourth optical signal is mutually orthogonal to the polarization state of the third optical signal in the adjusted polarization state, before combining the third optical signal in the adjusted polarization state and the fourth optical signal in the adjusted polarization state through polarization multiplexing in the different polarization states into one optical signal;
combining the first optical signal and the second optical signal through the polarization multiplexing of the first and second optical signals in the different polarization states to output a fifth optical signal;
combining the third optical signal and the fourth optical signal through the polarization multiplexing of the third and fourth optical signals in the different polarization states to output a sixth optical signal; and
changing a propagation direction of the fifth optical signal or a propagation direction of the sixth optical signal, so that the fifth optical signal and the sixth optical signal are combined into one optical signal.
14. The method according to claim 13, further comprising:
collimating the first optical signal and the second optical signal before combining the first optical signal in the adjusted polarization state and the second optical signal through polarization multiplexing; and
collimating the third optical signal and the fourth optical signal before combining the third optical signal in the adjusted polarization state and the fourth optical signal through polarization multiplexing.