What is claimed is:
1. A wavelength multiplexing method for use in an optical network that adopts a wavelength multiplexing system comprising the steps of:
driving a semiconductor laser by direct current modulation in response to an input electric signal; and
obtaining at least one signal carrier wavelength by dividing output wavelengths of the multi-mode oscillation semiconductor laser using an optical filter which passes at least one wavelength in said output wavelengths of said semiconductor laser.
2. A wavelength multiplexing method according to claim 1, wherein said wavelength multiplexing method has a function of outputting an optical signal by converting an electric signal introduced into a driving circuit, which is provided for carrying out direct current modulation of said multi-mode oscillation semiconductor laser.
3. A wavelength multiplexing optical transmitter comprising:
a multi-mode oscillation semiconductor laser;
a laser driving circuit for driving said semiconductor laser by an input electric signal; and
an optical filter having at least one passing band in an optical output from said multi-mode oscillation semiconductor laser; wherein at least one or more than one signal carrier wavelength is obtained by filtering the output of said semiconductor laser for slicing the output wavelength region of said semiconductor laser.
4. A wavelength multiplexing optical transmitter according to claim 3, wherein said transmitter has a function of outputting an optical signal by converting the introduced electric signal after the electric signal is subjected to a forward error correction by a forward error correction circuit disposed in front of said laser driving circuit.
5. A wavelength multiplexing optical transmitter according to claim 3, wherein said transmitter outputs an NRZ coded wavelength multiplexing optical signal by use of an NRZ coded electrical signal as the input electric signal
6. A wavelength multiplexing optical transmitter according to claim 3, wherein said transmitter outputs an RZ coded wavelength multiplexing optical signal by use of an RZ coded electrical signal as the input electric signal.
7. A wavelength adjusting apparatus using a wavelength multiplexing optical transmitter according to claim 3, wherein the signal carrier wavelength is changed by changing the transmitting wavelength region of said optical filter.
8. A wavelength adjusting apparatus according to claim 7, wherein said wavelength adjusting apparatus further comprises a laser driving circuit for directly modulating said multi-mode oscillation semiconductor by an electric current and said driving circuit converts the electric signal introduced in said driving circuit into optical signals having more than one signal carrier wavelength, and wherein said driving circuit changes said signal carrier wavelength by changing the transmitting wavelength region of said optical filter.
9. A wavelength adjusting apparatus according to claim 8, wherein said wavelength adjusting apparatus further comprises a forward error correction circuit for applying a correction code to the electric signal introduced into said laser driving circuit, wherein said wavelength adjusting apparatus outputs an optical signal by driving said semiconductor laser after the introduced electric signal is subjected to a forward error correction by said forward error correction circuit.
10. A wavelength adjusting apparatus according to claim 8, wherein said wavelength adjusting apparatus outputs an NRZ coded adjustable wavelength optical signal by introducing the NRZ coded electric signal to said laser driving circuit.
11. A wavelength adjusting apparatus according to claim 9, wherein said wavelength adjusting apparatus outputs an RZ coded adjustable wavelength optical signal by introducing the RZ coded electric signal to said laser driving circuit.
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 curtain airbag device, comprising:
a curtain portion provided at a window, the curtain portion being configured so as to be fixed to at least a window side at a portion thereof, accommodated at a peripheral portion of the window in a folded state thereof and cover the window in an inflated state thereof; and
a gas supply device operative to supply gas to an inflatable portion of said curtain portion to inflate said curtain portion in a specified condition,
wherein said curtain portion includes a tip side portion that is located at a tip of a side portion thereof and a tension portion that is located at the side portion thereof away from the tip side portion, said curtain portion in the folded state is accommodated in such a manner that the tip side portion is positioned near a support portion that is provided at a window edge and the tension portion is positioned near said window side to which the curtain portion is fixed, and said curtain portion is configured such that when the curtain portion is inflated with the inflation of the inflatable portion, the tip side portion is moved in an inflation direction and the tension portion is moved to the support portion so as to engage with the support portion,
wherein said curtain portion is configured so as to be fixed to a first window side at a portion thereof and accommodated at the first window side, a second window side and a third window side, the second and third window sides being located at both sides of the first window side, said curtain portion includes a second-window-side tip side portion that is located at a tip of a side portion thereof located at a side of the second window side and a third-window-side tip side portion that is located at a tip of a side portion thereof located at a side of the third window side, and a second-window-side tension portion that is located at the side portion thereof at the side of the second window side away from the second-window-side tip side portion and a third-window-side tension portion that is located at the side portion thereof at the side of the third window side away from the third-window-side tip side portion, said curtain portion in the folded state is accommodated in such a manner that the second-window-side tip side portion is positioned near a second-window-side support portion that is provided at the second window side and the third-window-side tip side portion is positioned near a third-window-side support portion that is provided at the third window side, and the second-window-side tension portion and the third-window-side tension portion are positioned near the first window side, and said curtain portion is configured such that when the curtain portion is inflated with the inflation of the inflatable portion, the second-window-side and third-window-side tip side portions are moved in the inflation direction, respectively, and the second-window-side and third-window-side tension portions are moved to the second-window-side and third-window-side support portions so as to engage with the second-window-side and third-window-side support portions, respectively.
2. The curtain airbag device of claim 1, wherein an angle formed between said window side to which the curtain portion is fixed and an adjacent window side is configured to be obtuse.
3. The curtain airbag device of claim 1, wherein said tip side portion and said tension portion are interconnected by a band, and the band is provided so as to become away from said window side to which the curtain portion is fixed.
4. The curtain airbag device of claim 3, wherein said band is provided at an outer side of said curtain portion in the folded state.
5. The curtain airbag device of claim 1, wherein said curtain portion has a lobe portion at which a slot is formed, and said tip side portion and said tension portion are connected by said lobe portion and said support portion engages with the slot.
6. The curtain airbag device of claim 1, wherein said window is a vehicle window, and said specified condition includes at least a vehicle-crash detection, a vehicle-crash prediction, or a vehicle-rollover detection.
7. The curtain airbag device of claim 6, wherein said support portion forms a tension line at the curtain portion when the curtain portion is inflated, and the tension line is formed at a location in which a center of an occupant’s head is located at a side of said window side to which the curtain portion is fixed relative to the tension line.
8. The curtain airbag device of claim 1, wherein said inflatable portion is formed near said tension portion.
9. The curtain airbag device of claim 1, wherein said inflatable portion is formed on a tension line of the curtain portion that is formed by said tension portion.
10. The curtain airbag device of claim 1, wherein said inflatable portion has a tip portion, and when the curtain portion is inflated, the tip portion of the inflatable portion extends beyond a window side other than said first, second and third window sides.
11. The curtain airbag device of claim 10, wherein an angle formed between said window side to which the curtain portion is fixed and an adjacent window side is configured to be obtuse.
12. The curtain airbag device of claim 10, wherein said inflatable portion is configured so as to be inflated in a substantially pole shape, extending beyond said window side.
13. The curtain airbag device of claim 12, wherein said inflatable portion is inflated in the substantially pole shape so as to be located close to either one of said second and third window sides.
14. The curtain airbag device of claim 10, wherein said window is a side window provided at a vehicle side, said specified condition includes at least a vehicle-crash detection, a vehicle-crash prediction, or a vehicle-rollover detection, and said inflatable portion is configured so as to be inflated, extending from the first window side located at an upper side of the vehicle beyond a belt line of a lower window side of the side window, in such a manner that the inflatable portion in the inflated state overlaps with a vertically-extending window pillar of the vehicle.