摘要:
An optical fiber coupler for optical fiber amplifier use in the field of optical communications is provided. The optical fiber coupler comprises: a rare earth-doped fiber as an optical amplifying element; a quasi rare earth-doped fiber for entrance of input signal light; a fused-stretch fiber portion as a multiplexing element which connects a part of the rare earth-doped fiber and a parts the quasi rare earth-doped fiber, wherein the fused-stretch fiber portion formed by stretched a fused mixture of parts of the rare earth-doped fiber and the quasi rare earth-doped fiber; and a single mode fiber which is jointed at a fused joint portion to another shortened rare earth-doped fiber connected to the fused-stretch fiber portion on a side connected by the quasi rare earth-doped fiber. The quasi rare earth-doped fiber has substantially equal propagation constant to the rare earth-doped fiber without substantially containing rare earth elements. The optical fiber coupler is fabricated by the steps of jointing a single mode fiber with a rare earth-doped fiber by fusing abutted end faces of both fibers to form a combined fiber; and fusing parallel contact parts of a quasi rare earth-doped fiber and of the rare earth-doped fiber of the combined fiber and then elongating the fused parts in a desired diameter to form a fused-stretch fiber portion.
摘要:
The power line communications system of the present invention comprises a power line L that has a plurality of branch lines LB1 to LBn branched at a branch point; communications devices T1 to Tn that are connected to the branch lines LB1 to LBn and perform sending and receiving of data via the branch lines LB1 to LBn; and a relay device 1 that is disposed at the branch point and relays sending of the data. It is also provided with a branching device Y that consists of a plurality of couplers K1 to Kn that couple the relay device 1 and the plurality of branch lines LB1 to LBn and have different resonance frequencies for each of the respective branch lines LB1 to LBn, with the relay device 1 performing sending of data by changing the communication frequency to the resonance frequency of the branch lines LB1 to LBn through which the data are sent.
摘要:
The present invention is directed to decrease the impact sound of the ratchet mechanism generated at the time of piston retraction. The tensioner includes a piston 3 slidable in the piston bore 2a of the housing 2 and an expandable circlip member 5 engageable with the engagement groove 3a of the piston 3. The piston bore 2a has a guide groove 20 formed therein that has front and rear stop surfaces 20a, 20b adapted to contact the circlip member 5. The engagement groove 3a is formed by a round seat portion S0 that the circlip member 5 is adapted to seat, a piston-retraction restricting portion S0S1 that is formed on front side of the round scat portion S0 and a piston-advance permitting portion S0S2 that is formed on the front side of the round seat portion S0. The piston-retraction restricting portion S0S1 permits the circlip member 5 to travel a short distance toward the front side along the rear side stop surface 20b to allow for an enlargement of the circlip member 5 and to restrict retraction of the piston 3 when the piston 3 retracts and the circlip member 5 contacts the rear side stop surface 20b of the guide groove 20.
摘要:
A connection end portion of a PC fiber 10 is fused by heating to provide a sealing portion 15 which seals holes 12a of a cladding 12. Length L of the sealing portion 15 is determined by calculation based on the conditions such as an incident angle θ [°] of signal light 22 with respect to the PC fiber 10, an outer diameter D [μm] of the fiber, a diameter a [μm] of the core of the fiber and a refractive index n of the sealing portion 15.
摘要:
The invention provides a cleaning method comprising:a step of immersing the object of cleaning first in a first tank to wash roughly by bubbling from beneath, and showering with purified water from above when lifting the object,a step of immersing the object coming from the first tank in a second tank to wash preliminarily with ultrasonic waves, and showering with purified water from above when lifting the object,a step of immersing the object coming from the first tank or second tank successively in a third tank to wash thoroughly with ultrasonic waves and water jet, and showering with purified water from above when lifting the object, anda step of immersing the object coming from the third tank finally into a fourth tank to finish with water jet, and lifting. In this cleaning method, only purified water harmless to human and environment is used as cleaning fluid, and the same cleanliness as in conventional cleaning with chlorofluorocarbons or trichloroethane is obtained, while there is no side effect such as discoloring of work surface.
摘要:
A fluidity improver for a PC resin that improves the melt fluidity during molding without impairing the excellent properties of the PC resin, and also yields a molded product in which external appearance defects are unlikely. The fluidity improver for an aromatic polycarbonate resin according to the present invention is including a first polymer obtained by polymerizing 0.5 to 99.5 parts by mass of a monomer first mixture including 0.5 to 99.5% by mass of styrene and 0.5 to 99.5% by mass of phenyl (meth)acrylates, in the presence of a second polymer obtained by polymerizing 0.5 to 99.5 parts by mass of a second monomer mixture containing 0.5 to 50% by mass of α-methylstyrene, 0.5 to 99% by mass of styrene and 0.5 to 99% by mass of phenyl (meth)acrylates, wherein the combined total of both monomer mixtures is 100 parts by mass.
摘要:
The present invention is directed to decrease the impact sound of the ratchet mechanism generated at the time of piston retraction. The tensioner includes a piston 3 slidable in the piston bore 2a of the housing 2 and an expandable circlip member 5 engageable with the engagement groove 3a of the piston 3. The piston bore 2a has a guide groove 20 formed therein that has front and rear stop surfaces 20a, 20b adapted to contact the circlip member 5. The engagement groove 3a is formed by a round seat portion S0 that the circlip member 5 is adapted to seat, a piston-retraction restricting portion S0S1 that is formed on the front side of the round scat portion S0 and a piston-advance permitting portion S0S2 that is formed on the front side of the round seat portion S0. The piston-retraction restricting portion S0S1 permits the circlip member 5 to travel a short distance toward the front side along the rear side stop surface 20b to allow for an enlargement of the circlip member 5 and to restrict retraction of the piston 3 when the piston 3 retracts and the circlip member 5 contacts the rear side stop surface 20b of the guide groove 20.
摘要:
A fluidity improver for a PC resin that improves the melt fluidity during molding without impairing the excellent properties of the PC resin, and also yields a molded product in which external appearance defects are unlikely. The fluidity improver for an aromatic polycarbonate resin according to the present invention is including a first polymer obtained by polymerizing 0.5 to 99.5 parts by mass of a monomer first mixture including 0.5 to 99.5% by mass of styrene and 0.5 to 99.5% by mass of phenyl (meth)acrylates, in the presence of a second polymer obtained by polymerizing 0.5 to 99.5 parts by mass of a second monomer mixture containing 0.5 to 50% by mass of α-methylstyrene, 0.5 to 99% by mass of styrene and 0.5 to 99% by mass of phenyl (meth)acrylates, wherein the combined total of both monomer mixtures is 100 parts by mass.
摘要:
It is intended to provide a carbonated beverage excelling in function as thirst-quenching beverage and taste through strengthening or sustaining of carbonated feel peculiar to carbonated beverage (brisk intense stimulation and sensation at pass through the throat, brought about by carbon dioxide gas, and sensation of coolness (refreshing sensation) produced by a combination of carbon dioxide gas and flavor) which after opening, rapidly drops depending upon a combination of employed raw materials, such as fruit juice, sweetener, color additives and flavoring, and upon evaporation of carbon dioxide gas. The drop of carbonated feel brought about depending upon a combination of raw materials, such as fruit juice and sweetener, can be relieved by adding to a carbonated beverage an additive for carbonated beverage comprising spilanthol or a spilanthol-containing plant extract or plant essential oil as an active ingredient. Further, the addition would help inhibit drop of carbonated feel brought about depending upon evaporation of carbon dioxide gas after opening and would help retain the taste and function as function as thirst-quenching beverage inherently to be had by carbonated beverage even after opening.
摘要:
A connection end portion of a PC fiber 10 is fused by heating to provide a sealing portion 15 which seals holes 12a of a cladding 12. Length L of the sealing portion 15 is determined by calculation based on the conditions such as an incident angle θ [°] of signal light 22 with respect to the PC fiber 10, an outer diameter D [μm] of the fiber, a diameter a [μm] of the core of the fiber and a refractive index n of the sealing portion 15.