1. An optical wavelength multiplexing device comprising:
a multiplexing portion that outputs an optical multiplex signal by multiplexing optical signals;
an optical band-pass filter that receives an optical multiplex signal output by the multiplexing portion and lets the received optical multiplex signal pass therethrough, the optical band-pass filter being capable of changing a center wavelength and a band width;
a storage portion that stores wavelength band control information specifying the center wavelength and the band width; and
a control portion that controls the center wavelength and the band width of the optical band-pass filter based on the wavelength band control information.
2. The optical wavelength multiplexing device according to claim 1, wherein the storage portion stores wavelength band control information specifying the center wavelength and the band width based on a type of the multiplexing portion.
3. The optical wavelength multiplexing device according to claim 1, wherein the control potion detects that the wavelength band control information has an uncertain value, and makes the optical band-pass filter close a gate.
4. The optical wavelength multiplexing device according to claim 2, wherein the control potion detects that the wavelength band control information has an uncertain value, and makes the optical band-pass filter close a gate.
5. The optical wavelength multiplexing device according to claim 3, further comprising:
a branching portion to branch an optical multiplex signal output from the multiplexing portion; and
an input shutoff detection portion that receives the branched optical signal and detects input shutoff;
wherein when at least one of a situation where the input shutoff is detected and a situation where the input shutoff is not detected and the wavelength band control information has an uncertain value occurs, the control portion closes the gate and notifies the abnormal state.
6. The optical wavelength multiplexing device according to claim 4, further comprising:
a branching portion to branch an optical multiplex signal output from the multiplexing portion; and
an input shutoff detection portion that receives the branched optical signal and detects input shutoff;
wherein when at least one of a situation where the input shutoff is detected and a situation where the input shutoff is not detected and the wavelength band control information has an uncertain value occurs, the control portion closes the gate and notifies the abnormal state.
7. An optical wavelength multiplexing device comprising a plurality of optical wavelength multiplexing devices according to claim 1,
wherein the optical wavelength multiplexing device further comprises a block multiplexing portion that further multiplexes a plurality of optical multiplex signals having different wavelength bands output from the plurality of optical wavelength multiplexing devices.
8. The optical wavelength multiplexing device according to claim 7, wherein the storage portion stores wavelength band control information specifying the center wavelength and the band width based on a type of the multiplexing portion.
9. The optical wavelength multiplexing device according to claim 7, wherein the control potion detects that the wavelength band control information has an uncertain value, and makes the optical band-pass filter close a gate.
10. The optical wavelength multiplexing device according to claim 8, wherein the control potion detects that the wavelength band control information has an uncertain value, and makes the optical band-pass filter close a gate.
11. The optical wavelength multiplexing device according to claim 9, further comprising:
a branching portion to branch an optical multiplex signal output from the multiplexing portion; and
an input shutoff detection portion that receives the branched optical signal and detects input shutoff;
wherein when at least one of a situation where the input shutoff is detected and a situation where the input shutoff is not detected and the wavelength band control information has an uncertain value occurs, the control portion closes the gate and notifies the abnormal state.
12. The optical wavelength multiplexing device according to claim 10, further comprising:
a branching portion to branch an optical multiplex signal output from the multiplexing portion; and
an input shutoff detection portion that receives the branched optical signal and detects input shutoff;
wherein when at least one of a situation where the input shutoff is detected and a situation where the input shutoff is not detected and the wavelength band control information has an uncertain value occurs, the control portion closes the gate and notifies the abnormal state.
13. An optical wavelength dividing device comprising:
an optical band-pass filter capable of changing a center wavelength and a band width;
a storage portion that stores wavelength band control information specifying the center wavelength and the band width; and
a control portion that controls the center wavelength and the band width of the optical band-pass filter based on the wavelength band control information; and
a dividing portion that receives an optical multiplex signal output from the optical band-pass filter.
14. The optical wavelength dividing device according to claim 12, wherein:
the control potion detects that the wavelength band control information has an uncertain value; and
the optical band-pass filter, when the detection is notified, closes a gate.
15. An optical wavelength dividing device comprising a plurality of optical wavelength dividing devices according to claim 13,
wherein the optical wavelength dividing device further comprises a block dividing portion that divides an optical multiplex signal into a plurality of optical multiplex signals having different wavelength bands and outputs the plurality of optical multiplex signals to the plurality of optical wavelength dividing devices.
16. The optical wavelength dividing device according to claim 15, wherein:
the control potion detects that the wavelength band control information has an uncertain value; and
the optical band-pass filter, when the detection is notified, closes a gate.
17. An optical wavelength dividing multiplexing device comprising:
an optical wavelength multiplexing device according to claim 1; and
an optical wavelength dividing device according to claim 13.
18. The optical wavelength dividing multiplexing device according to claim 17, further comprising a plurality of the optical wavelength multiplexing devices and the optical wavelength dividing devices,
wherein the optical wavelength dividing multiplexing device further comprises:
a block multiplexing portion that multiplexing optical signals of the plurality of optical wavelength multiplexing devices; and
a block dividing portion that receives an optical multiplex signal from the block multiplexing portion, divides the optical multiplex signal, and outputs the divided optical multiplex signals to their respective ones of the plurality of optical wavelength dividing devices.
19. A method of controlling an optical band-pass filter installed in at least one of an optical wavelength multiplexing device and an optical wavelength dividing device, the method comprising:
determining wavelength band control information specifying a center wavelength and a band width of the optical band-pass filter capable of changing the center wavelength and the band width; and
controlling the center wavelength and the band width of the optical band-pass filter based on the wavelength band control information.
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 sweat absorbent strip for attachment inside headwear, comprising:
a self-adhesive strip formed of an absorbent foam core enveloped in opposing porous layers, said strip being substantially elongate and rectangular and coated with temporary adhesive on one side.
2. A sweat absorbent fabric strip for attachment inside a hat according to claim 1 wherein one of said porous layers is coated with a hydrophobic coating, and another of said porous layers is hydrophilic.
3. A sweat absorbent strip for attachment inside a hat according to claim 2 wherein both of said porous layers comprise woven paper.
4. A sweat absorbent strip for attachment inside a hat according to claim 2 wherein both of said porous layers comprise fabric.
5. A sweat absorbent strip for attachment inside a hat according to claim 2 wherein said hydrophobic coating is perfluoromethylcyclohexane (PFMCH).
6. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said strip is approximately 7 inches long.
7. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said temporary adhesive is covered with a removable protective paper backing that is removed from said temporary adhesive before said strip is used.
8. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said temporary adhesive attaches lengthwise to brow of said hat.
9. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said hat is a personal ball cap.
10. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said hat is a construction hard hat.
11. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said hat is a sports helmet.
12. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said strip may be discarded after every use of said strip.
13. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein said strip is packaged in plastic.
14. A sweat absorbent strip for attachment inside a hat according to claim 1 wherein a plurality of said fabrics strips are dispensed from a box dispenser.