通过对前后两段铒光纤的长度优化，使得增益均衡滤波器的谱特性易于实现。

The length of two EDFs is optimized to make the transmission spectrum of gain equalization filter easy to be realized.

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前置放大器与均衡器或滤波器跟在雪崩二极管检测器的后面以获得增益，线性信号处理及噪声宽带的抑制。

The avalanche photodiode detector is followed by a front-end amplifier and equalizer or filter to provide gain as well as linear signal processing and noise bandwidth redution.

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结合不使用增益平坦技术条件下增益特性曲线的特点，设计了一种由三个LPG组成的均衡滤波器。

Given the amplifier's gain curve without using any gain flattening techniques, the gain flattening filter consisting of three LPGs is designed.

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