到后来，他能放大胆逐渐靠近那条板凳了。
光在光纤中传输，能量会逐渐衰退，造成远距离信号的消失，因此就要对光在中间进行放大和提高光注入光纤的能力。
With light propagating in the optic fiber, energy will decline gradually and the remote signal will disappear. Thus, signal should be enlarged and the ability of light - coupling will be improved.
随着设计技术的不断进步，D类功率放大器的性能指标也逐渐接近AB类放大器。
With the continuous advancement of technology, design, D-type power amplifier performance is also moving into the Class AB amplifier.
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