经过实例证明，在单个换热器热负荷被限制的情况下，原有的超结构级数不再符合优化的要求，因此建立了超结构级数的设定方法。
Some examples prove the original way to determine the number of stages is inapplicable if the heat load of heat exchanger is limited, so a new way to determine the number of stages is established.
同时给出了一个非线性直接优化算法，该算法避开了常规的台劳级数线性展开的方法，易于在计算机上实现。
A nonlinear direct optimization algorithm is given. The algorithm is diferent from the Talor expansion methods and easy to be realized by computer.
并对波导芯尺寸、相邻阵列波导间距、衍射级数、阵列波导数等参量进行了优化，得到了器件实际设计所需要的相应的参数值，从而达到优化器件设计的目的。
Some parameters, such as the core width, pitch of adjacent waveguides, diffraction order, number of arrayed waveguides, and propagating wavelength are optimized for the purpose of actual design.
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