122results about How to "Controllable output" patented technology

A floating type wave power generation system is characterized in that the system consists of eight sets of lever-type floating bodies and a hydraulic energy accumulation converter with the hydraulic pump function. On a floating workbench 7, eight sets of levers 2 and a floating body 1 are connected through supporting hinge bearers 10 and 11; in this way, the highly undulating displacement caused by waves can be converted to relatively lesser displacement of a piston rod 4, and the minor force that the floating body bears can be converted through the lever to the major force on the piston rod. The piston rod drives a hydraulic tank 3 to switch and transmit the hydraulic energy through a connecting oil pipe5, a high-pressure oil pipe6, a hydraulic oil tank and four no-return valves of each set to a hydraulic motor in a hydraulic power generation control chamber 9; in this way the generator is driven to work. The present system can absorb, convert and accumulate the intermittent unstable wave energy in a highly effective way and can buffer the destructive effect of waves. The floating platform can be suitable to different marine space by adjusting the length of an anchor chain 8. And in various sea conditions, kinetic energy and potential energy possessed by waves in the sea surface can be converted and accumulated as hydraulic mechanical energy by utilization of the wave drop; thus the generator is driven to unremittingly provide electric power.

The invention discloses a high-power direct-current charging machine / pile DCDC conversion device for an electric automobile and a control method of the high-power direct-current charging machine / pile DCDC conversion device. A multiphase interleaving voltage decrease and increase adjustment technology is adopted in the device, the requirements for adjustment of wide voltage input and wide voltage output are met, and through the modularized control structure design, the output of charging energy can be controlled, the output ripples can be reduced, and power and efficiency are improved. The output voltage and the current of the device can both be controlled, and the device has the protection functions of current protection, voltage protection, temperature protection, power protection, drive short circuit protection and the like; and a pre-starting current limiting module, a charging pre-starting and discharging protection module, a hardware overcurrent protection module and a fault signal processing module are additionally arranged, so that the safe reliability of the device is effectively enhanced. The device is small in ripple, high in conversion efficiency, low in cost, simple in structure, small in start current and high in safe reliability, the device can be used for high-power direct-current charging machine / pile DCDC power conversion for the electric automobile and also be used for other power and power supply equipment, and the device is suitable for being used in various power and electronic fields.

The invention provides a method for preparing activated carbon by utilizing direct coal liquefaction residue as a raw material. The method includes the steps as follows: (1) adding smashed direct coal liquefaction residue together with KNO3, KOH and absolute alcohol into water, stirring to be uniform under room temperature, and later drying the obtained mixture to obtain a dry material; (2) placing the prepared dry material in a carbonization furnace, conducting preoxidation in the atmosphere of air, conducting carbonization-activation in the atmosphere of inertia gas, and then obtaining coarse activated carbon; and (3) acid-washing and deashing the prepared coarse activated carbon to obtain finished activated carbon. The method is simple in preparation process route, uses conventional equipment and has universality to the raw material. The obtained activated carbon has not only characteristics of high specific surface area, developed micropores and low ash content, but also controllable output, higher productivity, suitability for production in batches, and better technological and economic benefits.

The invention discloses a kiwi fruit tree form with a single trunk and double main tendrils and a shaping trimming method of the kiwi fruit tree from. The trunk of the tree form is perpendicular to the ground, the height of the trunk ranges from 1.8m to 2.1m, the two main tendrils reversely horizontally extend by 2m to 3m along a row direction after being annularly crossed at a rack surface, 20 to 30 side tendrils are distributed on two sides of each of the double main tendrils like feathers, the pitch between each two side tendrils on the same side ranges from 30 cm to 40 cm, the side tendrils are perpendicular to the main tendrils to horizontal extend, and after the tree form is formed, allowance of full buds of a kiwi fruit tree garden per mu range from 10000 to 12000 after the kiwi fruit tree garden is trimmed in winters. The shaping trimming method of the kiwi fruit tree form is simple, after a tree is cultivated and formed, strong new side tendrils are reserved in summers to be used as fruit mother tendrils to cultivate in the next year, residual sprout tillers and new tendrils are removed, the fruit mother tendrils in the current year are reduced or removed when trimming inthe winter, and are replaced by the new fruit mother tendrils, branches and tendrils are bound in time, operation is easy, the quality of fruit is high, shortcomings that an existing kiwi tree form is messy, trimming is troublesome and the quality of fruit is poor are overcome, and accordingly the method is suitable for simplified trimming for a kiwi fruit tree garden by low labor intensity.

The invention relates to an amphiphilic chitosan material prepared by grafting lipophilic micro-molecular lithocholic acid on chitosan molecules and having good biocompatibility and degradability. Under catalysis of catalysts EDC and NHS, Mv64-230KDa amphiphilic macromolecular chitosan and lipophilic micro-molecular lithocholic acid are subjected to amidation reaction to form the amphiphilic chitosan material with good biocompatibility and degradability; in acidic solution with pH of less than 6.5, the amphiphilic chitosan material can rapidly form uniformly-distributed nanometer micelle with granularity of between 200 and 400 nm based on a molecule self-assembling principle under the ultrasonic condition; and an internal amphiphilic structure of the amphiphilic chitosan material is favorable for improving solubility of fat-soluble medicaments and further the bioavailability of the medicament in human body is expected to be improved..

A composite fruit juice and its processing method belong to the deep processing field of fruits. The invention aims to solve the technical problem that lipid in present fruit juice drinks is not easy to absorb. The composite fruit juice is mainly prepared by processing blackcurrant, raspberry, cherry, sea-buckthorn, Actinidia arguta, blueberry, blackberry, lingonberry, strawberry, pomegranate, mulberry, Rosa davurica, lonicera edulis and Acanthopanax Sessiliflorus. The processing method is to adopt technologies of fermentation, alcohol extraction, crushing, mixing, ultra-high temperature sterilization and the like. The composite fruit juice has a good capability of removing hydroxyl radicals and the clearance reaches up to 96.9%.

The invention discloses a robot automatic welding system for a car body and relates to the technical field of robot spot welding automation. The robot automatic welding system for the car body comprises a robot walking mechanism, an electrode dresser, a robot control cabinet, a robot, a C-shaped servo electrode holder placing rack, a C-shaped medium-frequency servo electrode holder, an X-shaped servo electrode holder placing rack, an X-shaped medium-frequency servo electrode holder and a latticed fence, wherein the robot walking mechanism comprises a walking mechanism base assembly, a movable sliding table and a support assembly, the movable sliding table is slideably arranged on the walking mechanism base assembly, the support assembly is installed on one side of the movable sliding table, the robot is fixedly installed on the movable sliding table, the electrode dresser and the robot control cabinet are installed on the support assembly, the robot control cabinet is connected with the robot, and the C-shaped medium-frequency servo electrode holder and the X-shaped medium-frequency servo electrode holder are connected with the robot through tool changers. The robot automatic welding system for the car body has the advantages that the acting stability is reliable, the repetitive accuracy is high, the labor conditions of operating workers are improved and the welding quality and labor productivity are improved.

The invention discloses a preparation method of an amphipathic gama-polyglutanmic acid nanodrug carrier. The preparation method comprises the steps of grafting hydrophobicity group on gama--polyglutanmic acid serving as a main chain, thus obtaining amphipathic gama-polyglutanmic acid derivates with good biocompatibility and degradability, and self assembling in water medium to form nano micelle with particle size of 200-1000nm. The hydrophobic nuclei-hydrophilic shell structure is beneficial to improvement of solubility of hydrophobic drug in water medium, further possibly improves the bioavailability of drugs in the body, and also can be used for load of protein and DNA. The preparation method of the amphipathic gama-polyglutanmic acid nanodrug carrier is simple and practicable, all raw materials can be industrially produced; reproducibility is good; and the amphipathic gama-polyglutanmic acid nanodrug carrier has high drug loading rate, good sustained release effect and intelligent environment response (pH-enzyme complex sensitivity) and other corresponding characteristics, as well as good popularization and application values.

The invention discloses preparation and stripping methods of lamellar zinc hydroxide and zinc oxide nanocones. A lamellar zinc hydroxide nanocone with a uniform shape is obtained through mixing metal zinc salt, an alkali source and an anionic surfactant, carrying out water bath heating in a pure water system and reacting. The lamellar zinc hydroxide nanocone is put into a reaction system and then is heated and stripped to obtain a single-layer zinc hydroxide nano-sheet; meanwhile, the lamellar zinc hydroxide nanocone is calcined at high temperature to obtain a porous zinc oxide nanocone. The preparation and stripping methods disclosed by the invention have the advantages of simple process, safety in operation and wide applicability; the problems of an existing synthetic route that sizes of prepared grains are not uniform, a synthetic process is uncontrollable and cost and energy consumption are relatively high and the like are overcome. Products prepared by the preparation and stripping methods have a novel shape and a uniform size, have a good lamellar structure, and have a wide application prospect in the aspects of organic pollutant adsorption, photocatalysis and the like.

A flywheel energy storage system for preventing power interruptions to a load from interruptions of primary power includes a flywheel supported for rotation about an axis on a bearing system, and a motor-generator having a rotor coupled with the flywheel, and having a stator with multiple armature windings and a field coil. The field coil generates flux that passes through the armature windings as the rotor rotates to produce torque for accelerating the flywheel during charging, and produces electrical power from the flywheel during discharge. The armature windings are energized by a DC buss that is supplied by a rectifier connected to primary power. The flywheel system provides instantaneous full power capability along with output control for extracting more energy from the flywheel. The field coil is oversized and is powered in standby operation to produce an armature back emf that is at least 75% of the DC buss voltage. The current to the field coil remains substantially constant during a period including immediately before an interruption and immediately after and interruption of primary power. The flywheel system uniquely utilizes an extremely large field coil, which is preferably 25-50% of the weight of the flywheel. The increased field coil size allows for both full standby energization without overheating and also reduces the armature reaction such that full power is available during a power interruption without requiring instantaneous increasing of the field coil current. In one embodiment, the field controller has a speed sensor for monitoring rotational speed of the flywheel and for varying electrical power to the field coil, without monitoring the primary power for interruptions. The field controller varies electrical current to the field coil approximately inverse linearly with the rotational speed of the flywheel during both standby and discharging operation to govern power to the field coil during standby operation such that the back emf of the armature remains substantially constant during an interruption of power.

The invention discloses a crystal grape slope TU shape pruning technology. Seedlings in the current year are planted, and short seedling segments are reserved. After sprouting, two young sprouts are selected and remained; after the two sprouts grow up, one strong branch serves as the main vine and is guided to spread onto a trellis through an inserted rod in a stretched mode, the weak branch is removed, pinching is carried out on the main vine after the main vine grows up to form a trunk, two accessory buds are cultivated on two upper knots and used as main branches after pinching, the other accessory buds are removed, and grape tendrils are removed too. The two main branches grow towards the two sides in the horizontal direction of a slope, then are guided upwards along the slope in the direction perpendicular to the horizontal line of the slope, are subjected to binding cultivation, and then are subjected to pinching. Secondary accessory buds growing at knot axils of the main branches are all reserved, leaf remaining and pinching are carried out on all the secondary accessory buds, and the secondary accessory buds are bound. Crystal grape branches and tendrils in a mountainous region do not overlap or overlap slightly after pruning, the steps of pruning, branch binding, pinching, bud removing, bagging, picking and the like are simple and fast, labor and time are saved, tree vigor is strong, the tree form is stable and standard, fruit clusters are large and orderly, products are high in commodity, and the yield is easy to control.

The invention provides a method for manufacturing an intelligent transparent and conductive fabric based on composite modification of nanoparticles and nanowires. The method comprises the following steps: putting ethylene glycol into polyvinylpyrrolidone of a high molecular weight, stirring violently till the polyvinylpyrrolidone is completely dissolved, adding copper chloride, sealing, performinga heating reaction, further adding a silver nitrate solution, shielding light, stirring violently, heating in an oven, and cleaning so as to obtain a mixed solution of silver nanowires and silver nanoparticles; putting a conductive polymer, silicon nanowires and graphene into the mixed solution of the silver nanowires and the silver nanoparticles, and uniformly mixing so as to obtain a transparent conductive solution; pretreating and cleaning the surface of a fabric, performing waterproof coating treatment, further coating the fabric with the transparent conductive solution, and finally performing surface treatment, namely spraying sodium borohydride, so as to obtain a transparent conductive coating modified fabric; adhering a Fe-N-C porous particle layer to the transparent conductive coating modified fabric, thereby obtaining the intelligent transparent and conductive fabric based on composite modification of nanoparticles and nanowires.

The invention discloses a broadband controllable photon millimeter wave noise signal generator and a signal generation method thereof. A hyperspectral density chaotic laser is used as a photo-generated millimeter wave noise of an entropy source, high-power and broadband-adjustable millimeter wave noise is generated, compared with an existing millimeter wave noise generator, the electron bandwidthbottleneck is broken through, the generated noise bandwidth is wider, the power is higher, the noise spectrum is flatter, and the super-noise ratio is adjustable in a large range. Test requirement ofa to-be-tested device of which the upper limit of the working frequency reaches 325GHz can be met; and through combination of the optical amplifier and the optical attenuator, the optical power of thetwo paths of chaotic light can be regulated and controlled, so that real-time controllable output of millimeter wave noise power is realized. According to the invention, the problem that the existingnoise generator is difficult to meet the power required by the existing radar, communication device and the like is solved.

A pressure pad (1) has two sets of cells (11, 12) with a sensor pad (8) positioned under the pad (1). During inflation, part of the low goes to the sensor pad (8) to exhaust and the rest fills the cells (11 or 12). Any change in patient position / weight causing a change in airflow in tube (10) will alter the differential pressure measured at the pressure transducer (16). Based on this feedback the microprocessor directly controls the power level to the pump (6) thus adjusting the airflow to the cells to prevent bottoming or to rung at a minimum pressure. The pressure pad (1) is segmented into a heel section, upper leg section, torso section, and a head section. The heel, head and upper leg sections are maintained at a lower pressure P1 and the torso section at a higher pressure P2. A control module (50) to control the flow in the segments is provided inside the pressure pad (1). The pressure pad (1) can be an alternating or static pad.

The invention belongs to the scientific and technical field of carbon materials, and provides a method for preparing metal or metal oxide / carbon composite materials by asphaltine. The method takes the by-product asphaltine in the coal liquefaction process as a carbon source, takes a pyrolytic polymer as a pore-forming agent, and takes easily-pyrolytic metal salt as a metal precursor; and then the metal or the metal oxide / carbon composite materials are prepared by one step after the physical blending and carbonizing reductive treatment. The metal or the metal oxide / carbon composite materials prepared by the method have the controllable appearance that the metal or the metal oxide is uniformly dispersed in a carbon carrier with the grain diameter of 3-50nm. The preparation process has simple routes, mild conditions, conventional equipment, low cost, and controllable output of products, and is suitable for mass production. The prepared metal or the prepared metal oxide / carbon composite materials can be used as a highly-active catalyst, an adsorbent, a magnetic separation material, an electrode material and the like.

The invention relates to a cationic amphiphilic chitosan nano drug carrier and a preparation method and application thereof. The preparation method is characterized in that lipophilic micromolecular deoxidized bile acid and hydrophilic micromolecular glycidyl trimethyl ammonium chloride are respectively grafted on chitosan molecules, thus obtaining a degradable amphiphilic chitosan material with good biocompatibility; in a wide pH solution, the amphiphilic chitosan material can quickly form a nano micelle which has a grain size of 150-350nm and is uniformly distributed through the principle of molecular self assembly under ultrasound conditions; and the inner lipophilic structure of the nano micelle is beneficial to improvement of the solubility of fat-soluble drugs in the aqueous solution, thus being expected to improve the in-vivo bioavailability of the drugs. The method has the advantages of simple requirements for instruments and equipment, simple and controllable preparation process and easy realization of large scale, so that the method is suitable for preparing nano carrier release systems of antitumor drugs with high price and poor water solubility and bioavailability such as paclitaxel, doxorubicin, camptothecin, vincaleucoblastine and the like. As a new dosage form of the antitumor drugs, the drug carrier has wide market prospects and potential clinical tumor treatment values.

The invention relates to a method for preparation of graphene fibers. The method includes the following steps that a microfluidic chip is used for microfluidic spinning of a graphene oxide aqueous solution to obtain graphene oxide fibers; the graphene oxide fibers react under the action of a reducing agent at a reaction temperature of 90 DEG C to obtain the graphene fibers; the microfluidic chip includes an internal phase channel and an external phase channel, the internal phase channel is provided with an internal phase channel outlet, and the internal phase channel is in fluid communicationwith the external phase channel through the internal phase channel outlet; a method for microfluidic spinning includes the steps that the graphene oxide aqueous solution and coagulation liquid are introduced into the internal phase channel and the external phase channel respectively, and the graphene oxide aqueous solution flows into the external phase channel through the internal phase channel outlet, and solidifies under the action of the coagulation liquid to obtain the graphene oxide fibers. By adopting the method, controlled preparation of the graphene fibers is achieved by using a microfluidic technology; the method can be used for preparing the graphene fibers with an ordered microstructure arrangement and good mechanical properties and continuous properties.

The invention discloses a Laval nozzle utilized wind power generation method which is implemented by the aid of one or multiple Laval nozzles. One end of each Laval nozzle is used as an inlet end while the other end thereof is used as an outlet end. A wind power generation unit is arranged in an internal pipe of each Laval nozzle. By means of multiple combinations, on the basis of the Laval nozzles and the air as a running carrier, abnormal running is realized. By means of wind-air conversion, light-air conversion, water-air conversion and heat-air conversion, and through an air reservoir system, continuously stable running is realized, problems of inconsequent and unstable power supply in existing wind power generation are solved, a stable, continuous, speedy, efficient, cheap and controllable green power generation system is realized finally, low-price high-efficiency energy output is achieved, and the Laval nozzle utilized wind power generation method meets requirements in reality and has high social and economic values.

A wideband light source is disclosed. The wideband light source includes a first optical amplifier for generating and amplifying a C-band spontaneous emission light, a second optical amplifier for generating C-band and L-band spontaneous emission lights which is pumped by the C-band spontaneous emission light to amplify an L-band spontaneous emission light, and a reflector positioned between the first and second optical amplifiers to reflect the C-band spontaneous emission light provided from the first optical amplifier back to the first optical amplifier and the C-band and L-band spontaneous emission lights provided from the second optical amplifier back to the second optical amplifier.

The invention discloses robot welding equipment for a barbecue oven. The robot welding equipment for the barbecue oven comprises a robot, a PLC (Programmable Logic Controller), a video monitoring feedback system, a safety protecting device, welding equipment, a revolving working platform and a demonstrator, wherein the PLC is connected with the robot, the welding equipment, the revolving working platform, the safety protecting device, the video monitoring feedback system and the demonstrator, so as to realize receiving a feedback signal or sending out a control signal. The robot welding equipment for the barbecue oven has the advantages that the welding performance is reliable, the quality of a weld seam is excellent, welding parameters are conveniently adjusted, and the efficiency is high; the robot is used for sequentially carrying out welding according to a programmed program; the production efficiency is increased; the labor condition of a worker is improved; the welding is carried out by adopting the robot; the worker is only used for loading and unloading the barbecue oven, and keeps away from welding arc light, smog, splashing and the like; the worker is free from high-intensity physical labor; the robot is not tired, and can be used for continuous production for 24 hours in one day; the efficiency is increased more obviously; the product cycle is clear; and the product equality is easily controlled.

The invention provides a picosecond-controllable dual-wavelength fiber laser. The output of mode locking pulse laser with different wave lengths is realized by using a plurality of mode locking devices to share a gain fiber, the picosecond output is controllable through the polarization characteristic, and the laser output or the oscillation inhibition is realized through modulating two polarization controllers in different resonant cavities.

The invention relates to a device for automatically outputting e-liquid. The device comprises a shell, a driving part, a controller, a battery assembly, an e-liquid storage bin, a piston assembly, a fixing base and an ejector-pin-type one-way valve; the driving part and the controller are fixed in the shell; the driving part is electrically connected with the battery assembly; the driving part isconnected to the piston assembly; the controller is electrically connected with the driving part and controls the driving part to drive the piston assembly to move in the e-liquid storage bin in the axis direction of the piston assembly; the e-liquid storage bin is located in the shell and provided with an e-liquid inlet and an e-liquid outlet; the fixing base is fixed to the top of the shell andlocated at the top of the e-liquid storage bin; a through hole is formed in the middle of the fixing base and internally provided with the ejector-pin-type one-way valve; the ejector-pin-type one-wayvalve can be converted to be communicated with or close the e-liquid outlet of the e-liquid storage bin. The invention further provides an electronic cigarette. By means of the device for automatically outputting the e-liquid, the output amount of the e-liquid can be controlled, and the electronic cigarette is prevented from e-liquid leakage at the same time.

The present invention discloses a method for improving the rice yield through OsGRF6 gene, and applications thereof, and belongs to the technical field of crop genetic engineering. According to the present invention, after the GRF6 gene is subjected to overexpression in rice, the secondary rachis branch number and the number of grains per ear of the rice are increased, and after the GRF6 gene is subjected to knocking-out, deactivation or activity reducing in rice, the secondary rachis branch number per ear and the number of grains per ear are significantly reduced, such that it is indicated that the gene can control the rice yield; the GRF6 gene is introduced into the rice through the expression vector to make the GRF6 be subjected to overexpression so as to increase the rice yield; the GRF6 gene can further be used as the molecular marker used in the crop breeding; and the GRF6 gene provides the powerful means and tool for the new high yield rice variety by using the molecular marker-assisted breeding and the genetic engineering method, and has great application potential.

The invention discloses a switch power supply device compatible with various power supply modes for a base station, relates to power supply technologies of communication base stations, and aims to provide the switch power supply device compatible with various power supply modes of new energy, power frequency alternating current, high frequency alternating current and the like for the base station. According to the technical key points of the switch power supply device, the switch power supply device comprises a power frequency / high frequency switching device, a switch power supply monitoring unit, an alternating-current power distribution unit, a rectifying module, a direct-current distribution power supply, a storage battery and a high-frequency power generator, wherein the power frequency / high frequency switching device is provided with a power frequency alternating current input end, a high frequency alternating current input end and an alternating current output end; the high frequency alternating current input end is connected with the alternating current output end of the high-frequency power generator; the power frequency alternating current input end is connected to a commercial power supply; the power frequency / high frequency switching device, the alternating-current power distribution unit and the rectifying module are connected with a direct-current power distribution unit in sequence; the direct-current power distribution unit is connected with the storage battery, base station electric equipment and the like respectively.

The invention discloses a method for reducing acrylamide in starch-type fried food. The method comprises the following steps: firstly, immersing a starch-type food raw material in a natural extract aqueous solution for a period of time at a given temperature; removing water on the surface of the processed food raw material, and frying the food raw material at a certain vacuum degree; cooling the fried food to a room temperature, encapsulating the cooled fried food by using a polyethylene composite packaging bag filled with nitrogen with a volume percentage content of 70 to 99.9 percent, the packaged fried food is radiated by adopting electron beams / X rays generated by an electronic accelerator with an energy of 5 to 10 MeV, a beam current of 0.3 to 20 mA and beam power of 10 to 20 kW, and the radiation dosage is controlled at 1 to 5 kGy. When in work, the ambient humidity is limited at less than or equal to 60 percent. The method has the characteristics that the pretreatment of natural products is used to inhibit the radiation-induced odor, and the low-temperature vacuum frying is used to control a generation amount of the acrylamide, so that the content of the acrylamide in the starch-type fried food can be significantly reduced by utilizing low-dosage radiation, the nutritional quality and sensory quality of the food can be maintained, the sterilization can be realized, the sanitation is improved, and the food quality and security can be ensured.

The invention discloses a powder compressing machine facilitating fixing of a mold. The powder compressing machine comprises an upper beam and a base. A shell and four vertical columns are fixed to the top of the base, and the shell is located in the middle of the four vertical columns. A hydraulic pump is mounted at the bottom end of the interior of the shell, and the top of the hydraulic pump isconnected with a hydraulic telescopic rod. The end, away from the hydraulic pump, of the hydraulic telescopic rod is connected with a working table, and the working table is located on the shell. A static clamping block is fixed to the right end of the top of the working table, and two sliding grooves are formed in the top side face of the working table. The two sliding grooves are both located on the same side of the static clamping block. A positioning block is fixed to the end, away from the static clamping block, of the top of the working table. The powder compressing machine is providedwith a clamp assembly facilitating fixing of the compressing mold, the clamp assembly comprises a threaded rod, a movable clamping block and the static clamping block, the threaded rod is rotated to drive the movable clamping block to move in the direction close to and away from the static clamping block, and thus the distance between the movable clamping block and the static clamping block is changed.

A wideband light source is disclosed. The wideband light source includes a first optical amplifier for generating and amplifying a C-band spontaneous emission light, a second optical amplifier for generating C-band and L-band spontaneous emission lights which is pumped by the C-band spontaneous emission light to amplify an L-band spontaneous emission light, and a reflector positioned between the first and second optical amplifiers to reflect the C-band spontaneous emission light provided from the first optical amplifier back to the first optical amplifier and the C-band and L-band spontaneous emission lights provided from the second optical amplifier back to the second optical amplifier.