| Summary: | 碩士 === 大同大學 === 機械工程研究所 === 90 === The content of this thesis is focus on the optimization of cooling of an EDFA (Erbium Doped Fiber Amplifier). The simulation geometry of EDFA is same as far as possible with the prototype to be studied for the optimum cooling condition. The CFD analytical software, FLOTHERM, is used to do the simulations in this thesis in order to find out the optimum cooling design of EDFA. Six groups are built to be compared each other.
The results show that change of direction of gravity (i.e. how EDFA is put) influences the temperature of lasers greatly, and the position of the additional slot is an important factor for the temperature of lasers, too. The temperature of lasers is obviously varied when the direction of gravity and the position of the additional slot change even though these cases have the same area of slots. Changes of the thickness of the case of EDFA are relatively not so important for decreasing the temperature of lasers.
Cases which the top of lasers attaches the bottom surface of the EDFA top cover directly or via pure aluminum thermal pads get lower temperature of lasers. This phenomenon shows that heat sources of portable devices without fans like EDFA should conduct the heat to the case directly because conduction delivers the most of heat than those of convection or radiation. The temperature of lasers of the best case without fins in this thesis decreases almost 15℃ from the original design.
Finally, an EDFA with fins is built, and temperature of lasers decreases again, and the temperature of lasers decreases about 21.6℃ from the original design. So, only after the internal optimum design of EDFA collocating the external optimum design of EDFA comes the most decrease of temperature of lasers.
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