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A low-cost, fan assisted cooling device is disclosed. The cooling device includes a narrow bottom and broad top shape to optimize a material versus performance ratio. A plurality of vanes surround a central heat mass and an inside surface of the vanes define a chamber that surrounds the heat mass. A

A low-cost, fan assisted cooling device is disclosed. The cooling device includes a narrow bottom and broad top shape to optimize a material versus performance ratio. A plurality of vanes surround a central heat mass and an inside surface of the vanes define a chamber that surrounds the heat mass. A portion of each vane is split into a plurality of fins and both the vanes and the fins have a surface area that increase in a radially outward direction from an axis of the heat mass. The heat mass includes a boss that is surrounded by a groove. Both the boss and the grove have arcuate surface profiles. The vanes, the fins, the boss, and the groove efficiently dissipate heat when a fan or the like forces air into the chamber thereby producing air flows in three different directions. In a first direction, the air flows out of the chamber through the vanes. In a second direction, a low pressure region in the chamber induces air from outside the chamber to flow through the fins. In a third direction, the low pressure region induces an airflow over the groove and boss. Openings between the vanes are angled and offset from an orientation of the fans blades to minimize the airflow shock losses thereby reducing fan noise. The vanes and the fins can be homogeneously formed with the heat mass.

대표청구항 ▼

A low-cost, fan assisted cooling device is disclosed. The cooling device includes a narrow bottom and broad top shape to optimize a material versus performance ratio. A plurality of vanes surround a central heat mass and an inside surface of the vanes define a chamber that surrounds the heat mass. A

A low-cost, fan assisted cooling device is disclosed. The cooling device includes a narrow bottom and broad top shape to optimize a material versus performance ratio. A plurality of vanes surround a central heat mass and an inside surface of the vanes define a chamber that surrounds the heat mass. A portion of each vane is split into a plurality of fins and both the vanes and the fins have a surface area that increase in a radially outward direction from an axis of the heat mass. The heat mass includes a boss that is surrounded by a groove. Both the boss and the grove have arcuate surface profiles. The vanes, the fins, the boss, and the groove efficiently dissipate heat when a fan or the like forces air into the chamber thereby producing air flows in three different directions. In a first direction, the air flows out of the chamber through the vanes. In a second direction, a low pressure region in the chamber induces air from outside the chamber to flow through the fins. In a third direction, the low pressure region induces an airflow over the groove and boss. Openings between the vanes are angled and offset from an orientation of the fans blades to minimize the airflow shock losses thereby reducing fan noise. The vanes and the fins can be homogeneously formed with the heat mass. ving first and second ends, said first end being optically coupled to said input port, said second end being optically coupled to said output port, said signal light propagating in said first optical fiber from said first end to said second end; and an optical circulator portion comprising first and second 3-port optical circulators, said first and second 3-port optical circulators each having first, second, and third ports, wherein light from the first port passes to the second port, and light from the second port passes to the third port; wherein the first port of said first 3-port optical circulator is coupled to the input terminal; wherein the second port of said first 3-port optical circulator is coupled to the input of said optical amplification portion; wherein the first port of said second 3-port optical circulator is coupled to the output terminal; wherein the third port of said first 3-port optical circulator is coupled to the second port of said second 3-port optical circulator; and wherein the third port of said second 3-port optical circulator is coupled to the output port of said optical amplification portion. 3. The amplifier according to claim 1, further comprising a pump light source for generating the pumping light. 4. The amplifier according to claim 1, wherein said optical fiber device further includes second optical fiber, wherein said first and second optical fiber is provided in series between the input port and the output port, wherein the second end of said first optical fiber is optically coupled to the first end of said second optical fiber so as to receive said signal light, wherein the received signal light propagates in said second optical fiber from the first end thereof to the second end thereof, and wherein said second end of said second optical fiber is optically coupled to said third port of said optical circulator portion so as to provide said third port with said signal light, said second optical fiber being doped with at least erbium. 5. The amplifier according to claim 4, wherein said optical amplification portion further comprises an optical isolator provided between said first and second optical fibers. 6. The amplifier according to claim 5, wherein a length L1 of said first optical fiber and a length L2 of said second optical fiber satisfy 0.25≤L1/(L1+L2)≤0.85. 7. An optical fiber amplifier having an input terminal and an output terminal, comprising: an optical amplification portion having an input port provided so as to receive pumping light, an output port, and an optical fiber device doped with erbium and provided between the input port and the output port; and an optical circuit device provided between said input and output terminals and said optical amplification portion, said optical circuit device being capable of transmitting light in a 1,580-nm band between the input terminal and the input port of said optical amplification portion, said optical circuit device being capable of transmitting light in the 1,580-nm band between the output port of said optical amplification portion and the output terminal, and said optical circuit device being capable of blocking light in the 1,580-nm band and transmitting light in a 1,550-nm band between the input port and the output port of said optical amplification portion. 8. The amplifier according to claim 7, wherein said optical circuit device has first and second optical filter portions; wherein said first optical filter portion comprises a first port optically coupled to the input port of said optical amplification portion, a second port, and a third port, and said third port of said first optical filter portion is optically coupled to the input terminal; wherein said second optical filter portion has a first port optically coupled to the output port of said optical amplification portion, a second port optically coupled to the second port of said first optical filter portion, and a third port optically coupled to the o utput terminal; and wherein each of said first and second optical filter portions comprises means for filtering light, said means being provided between the first port and the second and third ports. 9. The amplifier according to claim 8, wherein said means for filtering light comprises a dielectric multilayer filter. 10. The amplifier according to claim 8, wherein said means for filtering light is capable of reflecting light in one band of the 1,550-nm band and the 1,580-nm band and transmitting light in the other band of the 1,550-nm band and the 1,580-nm band. 11. The amplifier according to claim 7, further comprising a light source for generating the pumping light. 12. The amplifier according to claim 7, wherein said optical fiber device comprises first and second optical fibers connected in series between the input port and the output port, said first and second optical fibers being doped with at least erbium. 13. The amplifier according to claim 12, wherein said optical amplification portion further comprises an optical isolator provided between said first and second optical fibers. 14. The amplifier according to claim 13, wherein a length L1 of said first optical fiber and a length L2 of said second optical fiber satisfy the following condition: 0.25≤L1/(L1+L2)≤0.85. 15. A method of optically amplifying signal light using an optical fiber device, said optical fiber device including first and second optical fibers, each of the first and second optical fibers having first and second ends, the second end of the first optical fiber being optically coupled to the first end of the second optical fiber, and the first and second optical fibers being doped with erbium, comprising the steps of: providing the signal light and pumping light to the first end of the first optical fiber, wherein the signal light propagates in a first direction from the first end of the first optical fiber to the second end of the second optical fiber; obtaining ASE light from the first end of the first optical fiber; providing the ASE light to the second end of the second optical fiber; and obtaining amplified signal light from the second end of the second optical fiber. 16. The method according to claim 15, wherein the step of obtaining the ASE light from the first end of the first optical fiber comprises the step of obtaining first ASE light, propagating in a second direction different from said first direction, from said first end of the first optical fiber; wherein the step of providing the ASE light to the second end of the optical fiber comprises the step of providing the first ASE light to the second end of the second optical fiber. 17. The method according to claim 16, further comprising the steps of: obtaining second ASE light, propagating in said first direction, from the second end of the first optical fiber; and providing the second ASE light to the first end of the second optical fiber. 18. An optical communications system for transmitting an optical signal having one or a plurality of wavelength components from an optical transmitter to an optical receiver, comprising: an optical fiber amplifier according to claim 1, provided between the optical transmitter and the optical receiver; a first optical transmission line having one terminal optically coupled to the input terminal of said optical fiber amplifier so as to supply optical signal from the optical transmitter to said optical fiber amplifier; and a second optical transmission line having one terminal optically coupled to the output terminal of said optical fiber amplifier so as to supply optical signal from said optical fiber amplifier to the optical receiver. 19. An optical communications system for transmitting an optical signal having one or a more wavelength components from an optical transmitter to an optical receiver, comprising: an optical fiber amplifier according to claim 1, provided between the optical transmitter and the optical receiver