Further analysis shows that it is caused by the enhancement of the threshold current density and threshold carrier density in terms of optical-gain spe.
进一步分析认为，这是因为条宽变窄导致器件阈值电流密度、阈值载流子密度变大造成的。
For a loss modulation where the threshold carrier density may change, the neglected term may become comparable to the retained first order small quantity.
在损耗调制的情况下，系统变化前后的阈值载流子密度不同，被忽略的二阶小量可能会达到与一阶小量可比拟的程度。
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