1. A wireless power transmission system comprising:
a power transmitting device including a power transmitting coil; and
a power receiving device including a power receiving coil,
wherein using magnetic field coupling between the power transmitting coil and the power receiving coil, electric power is wirelessly transmitted from the power transmitting device to the power receiving device,
wherein the power transmitting device includes a power transmitting circuit configured to generate an electric signal used for transmitting electric power, a first power transmitting coil compatible with a first transmission method, a second power transmitting coil compatible with a second transmission method, a first magnetic substance on which the first power transmitting coil is placed, a second magnetic substance on which the second power transmitting coil is placed, and a power feeding surface on which the power receiving device is to be placed,
and wherein the first magnetic substance includes a first attachment surface on which the first power transmitting coil is placed, the second magnetic substance includes a second attachment surface on which the second power transmitting coil is placed, and the first attachment surface and the second attachment surface are located on a lower side of the power feeding surface and arranged on a same plane surface parallel to the power feeding surface.
2. The wireless power transmission system according to claim 1, wherein the first power transmitting coil is a coil compatible with an electromagnetic induction method, and
the second power transmitting coil is a coil compatible with a magnetic resonance method.
3. The wireless power transmission system according to claim 2, wherein a coil diameter of the second power transmitting coil is larger than a coil diameter of the first power transmitting coil, and the second power transmitting coil is arranged so as to surround the first power transmitting coil when viewed from above.
4. The wireless power transmission system according to claim 3, wherein the first attachment surface and the second attachment surface are ring-shaped surfaces each including a predetermined width, the second attachment surface is arranged so as to surround the first attachment surface when viewed from above, the first power transmitting coil is arranged so as to occupy a substantially intermediate position between an inner circumference and an outer circumference of the first attachment surface, and the second power transmitting coil is arranged so as to occupy a substantially intermediate position between an inner circumference and an outer circumference of the second attachment surface.
5. A wireless power transmission system comprising:
a power transmitting device including a power transmitting coil; and
a power receiving device including a power receiving coil, wherein using magnetic field coupling between the power transmitting coil and the power receiving coil, electric power is wirelessly transmitted from the power transmitting device to the power receiving device,
wherein the power receiving device includes a first power receiving coil compatible with a first transmission method, a second power receiving coil compatible with a second transmission method, a power receiving circuit to which the first power receiving coil and the second power receiving coil are connected, a third magnetic substance placed on the first power receiving coil, a fourth magnetic substance placed on the second power receiving coil, and a power receiving surface to be placed on the power transmitting device,
and wherein the third magnetic substance includes a third attachment surface in contact with the first power receiving coil, the fourth magnetic substance includes a fourth attachment surface in contact with the second power receiving coil, and the third attachment surface and the fourth attachment surface are located on an upper side of the power receiving surface and arranged on a same plane surface parallel to the power receiving surface.
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 amplifier, comprising:
a demultiplexer which separates a broadband optical signal into a plurality of banded optical signals;
a plurality of ports, each of which is adapted to output a selected one of said plurality of banded optical signals; and
an amplifier section coupled to one of said plurality of ports.
2. An optical amplifier as recited in claim 1, wherein said amplifier section includes a dispersion compensator.
3. An optical amplifier as recited in claim 2, wherein said dispersion compensator is a reflective optical grating.
4. An optical amplifier as recited in claim 3, wherein said reflective optical grating is a Bragg grating.
5. An optical amplifier as recited in claim 1, wherein said amplifier section does not include a gain-flattening device.
6. An optical amplifier as recited in claim 1, wherein each of said banded optical signals has a finite wavelength range that is a segment of a wavelength range of said broadband optical signal.
7. An optical amplifier as recited in claim 6, wherein said amplifier section includes a gain medium chosen to provide substantially flat gain across said finite wavelength range.
8. An optical amplifier as recited in claim 1, wherein at least one other amplifier section is coupled to a another of said ports.
9. An optical amplifier as recited in claim 1, wherein an amplified output signal is output from the optical amplifier substantially free of gain tilt and gain ripple.
10. An optical amplifier as recited in claim 1, wherein at least two of said ports are coupled to a ribboned optical fiber, which has a plurality of gain fibers, each of which is chosen to provide substantially flat gain across a wavelength range of a respective one of said plurality of banded optical signals.
11. An optical amplifier as recited in claim 1, further comprising a plurality of amplifier sections, each of which is coupled to a respective one of said ports.
12. An optical amplifier as recited in claim 11, wherein each of said plurality of amplifiers sections has a gain medium chosen to provide a substantially flat gain across a wavelength range of a respective one of said plurality of banded optical signals.
13. An optical amplifier as recited in claim 1, wherein said broadband optical signal includes n optical channels, and said plurality of optical ports equals m, where n and m are integers.
14. An optical amplifier as recited in claim 13, wherein said plurality of banded optical signals equals nm.
15. An optical amplifier as recited in claim 1, wherein each of said plurality of banded optical signals includes at least two channels having a channel spacing chosen from the group consisting essentially of: 12.5 GHz, 25 GHz, 50 GHz, 100 GHz, 200 GHz and 400 GHz.
15. An optical amplifier as recited in claim 14, where n40 and m4.
16. An optical amplifier as recited in claim 13, wherein said plurality of banded optical signals does not equal nm.
17. An optical amplifier as recited in claim 2, wherein said dispersion compensator includes a coupled fiber structure.
18. An optical amplifier as recited in claim 1, wherein the amplifier output an amplified signal that has substantially no chromatic dispersion or dispersion slope.
19. An optical amplifier as recited in claim 1, wherein said amplifier section further comprises a pump multiplexer.
20. A method of amplifying a optical signal, the method comprising:
separating a broadband optical signal into a plurality of banded optical signals;
providing a plurality of ports, each of which outputs a selected one of said plurality of banded optical signals; and
coupling an amplifier section to one of said plurality of ports.
21. A method as recited in claim 20, further comprising providing a dispersion compensator in said amplifier section.
22. A method as recited in claim 20, wherein the method further comprises not providing a gain flattening device.
23. A method as recited in claim 20, wherein each of said banded optical signals has a finite wavelength range that is a segment of a wavelength range of said broadband optical signal.
24. A method as recited in claim 20, further comprising providing a plurality of amplifier sections, each of which is coupled to a respective one of said ports.
25. A method as recited in claim 24, wherein each of said plurality of amplifiers sections has a gain medium chosen to provide a substantially flat gain across a wavelength range of a respective one of said plurality of banded optical signals.
26. A method as recited in claim 20, wherein said broadband optical signal includes n optical channels, and said plurality of optical ports equals m, where n and m are integers.
27. A method as recited in claim 26, wherein said plurality of banded optical signals equals nm.
28. A method as recited in claim 26, wherein said plurality of banded optical signals does not equal nm.