What is claimed:
1. An optical switch comprising:
a first optical transmission line for transmitting a first optical signal;
an optical reflectivity variable mirror capable of varying a reflectivity in a range of 0% to 100% for reflecting said first optical signal, said optical reflectivity variable mirror being connected with said first optical transmission line;
a second optical transmission line connected through said optical reflectivity variable mirror to said first optical transmission line;
an optical transmitter connected through said second optical transmission line to said optical reflectivity variable mirror for transmitting a second optical signal,
wherein if said optical reflectivity variable mirror sets said reflectivity at less than 100%, then said first optical signal is reflected by said optical reflectivity variable mirror so that said first optical signal is outputted from said first optical transmission line,
wherein if said optical reflectivity variable mirror sets said reflectivity at 100%, then said first optical signal is transmitted through said optical reflectivity variable mirror, whilst said second optical signal transmitted from said optical transmitter is also transmitted through said optical reflectivity variable mirror to be outputted from said first optical transmission line.
2. An optical loop-structured circuit having at least a plurality of looped optical transmission lines having at least a plurality of optical transmission line junctions from which at least three optical transmission lines extend,
wherein at least one of said plurality of optical transmission line junctions has an optical device having at least any one of wavelength multiplexing and demultiplexing functions, which is connected to said at least three optical transmission lines, so that said optical device having at least any one of multiplexing and demultiplexing functions serves as a same roll as an optical coupler so as to reduce an optical power loss when said optical signal is transmitted through said optical transmission line junction structure.
3. The optical loop-structured circuit as claimed in claim 2, wherein all of said plurality of optical transmission line junctions have said optical devices.
4. The optical loop-structured circuit as claimed in claim 2, wherein at least one of said plurality of looped optical transmission lines has at least a single set of an optical amplifier and an optical isolator so that said optical loop-structured circuit has a function of an optical amplifier.
5. The optical loop-structured circuit as claimed in claim 4, wherein said at least one of said plurality of looped optical transmission lines is further connected to at least two set of an optical receiver and an optical transmiter so that said optical loop-structured circuit has a function of an optical add-drop multiplexer.
6. The optical loop-structured circuit as claimed in claim 2, wherein at least one of said plurality of looped optical transmission lines has at least a single set of an optical attenuator and an optical isolator so that said optical loop-structured circuit has a function of an optical equalizer.
7. The optical loop-structured circuit as claimed in claim 2, wherein at least two of said plurality of looped optical transmission lines are connected to an optical multiplexerdemultiplexer, whilst a single looped optical transmission line is separated by said at least two of said plurality of looped optical transmission lines from said optical multiplexerdemultiplexer, so that optical signals are individually transmitted along said plurality of looped optical transmission lines, and wherein all of said plurality of optical transmission line junctions have said optical devices.
8. The optical loop-structured circuit as claimed in claim 7, wherein each of said plurality of looped optical transmission lines has at least a single set of an optical amplifier and an optical isolator so that said optical loop-structured circuit has a function of an optical amplifier.
9. The optical loop-structured circuit as claimed in claim 8, wherein each of said plurality of looped optical transmission lines is further connected to at least two set of an optical receiver and an optical transmitter so that said optical loop-structured circuit has a function of an optical add-drop multiplexer.
10. The optical loop-structured circuit as claimed in claim 7, wherein each of said plurality of looped optical transmission lines has at least a single set of an optical attenuator and an optical isolator so that said optical loop-structured circuit has a function of an optical equalizer.
11. The optical loop-structured circuit as claimed in claim 2, wherein said optical device comprises an optical multiplexerdemultiplexer.
12. The optical loop-structured circuit as claimed in claim 2, wherein said optical device comprises an optical multiplexer.
13. The optical loop-structured circuit as claimed in claim 2, wherein said optical device comprises and optical demultiplexer.
14. An optical loop-structured circuit having at least a plurality of looped optical transmission lines having at least a plurality of optical transmission line junctions from which at least three optical transmission lines extend,
wherein at least one of said plurality of optical transmission line junctions has an optical circulator, which is connected to said at least three optical transmission lines, so that said optical circulator serves as a same roll as an optical coupler so as to reduce an optical power loss when said optical signal is transmitted through said optical transmission line junction structure.
15. The optical loop-structured circuit as claimed in claim 14, wherein all of said plurality of optical transmission line junctions have said optical circulators.
16. The optical loop-structured circuit as claimed in claim 14, wherein at least one of said plurality of looped optical transmission lines has at least a single set of an optical amplifier and an optical isolator so that said optical loop-structured circuit has a function of an optical amplifier.
17. The optical loop-structured circuit as claimed in claim 16, wherein said at least one of said plurality of looped optical transmission lines is further connected to at least two set of an optical receiver and an optical transmitter so that said optical loop-structured circuit has a function of an optical add-drop multiplexer.
18. The optical loop-structured circuit as claimed in claim 14, wherein at least one of said plurality of looped optical transmission lines has at least a single set of an optical attenuator and an optical isolator so that said optical loop-structured circuit has a function of an optical equalizer.
19. The optical loop-structured circuit as claimed in claim 14, wherein at least two of said plurality of looped optical transmission lines are connected to an optical multiplexerdemultiplexer, whilst a single looped optical transmission line is separated by said at least two of said plurality of looped optical transmission lines from said optical multiplexerdemultiplexer, so that optical signals are individually transmitted along said plurality of looped optical transmission lines, and wherein all of said plurality of optical transmission line junctions have said optical circulators.
20. The optical loop-structured circuit as claimed in claim 14, wherein each of said plurality of looped optical transmission lines has at least a single set of an optical amplifier and an optical isolator so that said optical loop-structured circuit has a function of an optical amplifier.
21. The optical loop-structured circuit as claimed in claim 20, wherein each of said plurality of looped optical transmission lines is further connected to at least two set of an optical receiver and an optical transmitter so that said optical loop-structured circuit has a function of an optical add-drop multiplexer.
22. The optical loop-structured circuit as claimed in claim 14, wherein each of said plurality of looped optical transmission lines has at least a single set of an optical attenuator and an optical isolator so that said optical loop-structured circuit has a function of an optical equalizer.
23. An optical gate switch comprises:
a main optical transmission line;
first and second optical multiplexerdemultiplexers provided on said main optical transmission line so that said first and second optical multiplexerdemultiplexers are separated from each other, and said first and second optical multiplexerdemultiplexers being connected with first and second subordinate optical transmission lines respectively;
an impurity doped fiber provided on said main optical transmission line and positioned between said first and second optical multiplexerdemultiplexers; and
an excitation light source connected through said first subordinate optical transmission line to said first optical multiplexerdemultiplexer so that said excitation light source emits an excitation light which is transmitted through said first subordinate optical transmission line and said first optical multiplexerdemultiplexer to said impurity doped fiber,
whereby said second optical multiplexerdemultiplexer transmits said optical signal onto said main optical transmission line and also transmits a leaked part of said excitation light onto said second subordinate optical transmission line.
24. The optical gate switch as claimed in claim 23, further comprising an optical reflecting mirror provided on said second subordinate optical transmission line for reflecting said leaked part of said excitation light to said impurity doped fiber.
25. The optical gate switch as claimed in claim 23, further comprising a secondary excitation light source on said second subordinate optical transmission line.
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. A flexible swimming pool, comprising a pool wall, a base sheet and an inflatable ring, said pool wall being formed by connecting the sidewalls which are made of flexible PVC plastic material sheets and provided with a reinforcing net therein, the inflatable ring being mounted on top of the pool wall to support the pool wall, characterized in that said sidewall is a continuous sidewall, that is, without a welding seam in a vertical direction from the top, on which the inflatable ring is connected, to the bottom; the sidewall is connected directly with the base sheet through a welding seam; the pool wall is formed by connecting a plurality of continuous sidewalls at both sides of them with each other into a loop; the pool wall formed of the sidewalls connected into a loop is connected with the inflatable ring at its top to support the pool wall in a vertical direction; at least one notch is cut out in the lower edge of each continuous sidewall; and a sidewall bottom ring folding inwards which is formed by overlapping and bonding the material sheets of both sides of each notch is connected directly with the base sheet.
2. The flexible swimming pool according to claim 1, wherein the notch cut out in the lower edge of each continuous sidewall is a notch of equilateral triangle, and a reinforcing sheet is provided on top of the portion where the material sheets of both sides of the notch are overlapped.