一种新型高速光保持模块

A Novel High-Speed Optical Hold Module

针对光电混合模数转换系统中采样光脉冲很窄,高速积分保持电路实现较困难这一问题,本文提出了一种新型的高速光保持模块.通过使用多个耦合器组成的无源结构,将采样后的超窄光脉冲转换成一族脉冲簇,再经过光电转换和电低通滤波,得到了顶部较平、脉宽较宽的脉冲,有助于降低后续处理电路的复杂度.实验结果表明,这种结构能够较好地实现将超窄脉冲展宽成平顶宽脉冲的功能.

In an optoelectronic hybrid analog-to-digital conversion system, the duration of the optical sampling pulses was so short that high-speed ＂ integrate-hold＂ electrical circuits were comparatively difficult to realize. In order to deal with this problem, a novel high-speed ＂ Optical Hold Module＂ was proposed in this paper. By using a passive structure that consists of multiple optical couplers, the postsampling ultra-short optical pulses were converted to pulse clusters, which were further converted to broader pulses with a relatively flat top after photo-electrical conversion and electrical low-pass filtering. This was helpful to reduce the complexity of the following electrical processing. The experiment shows that this structure was capable of converting the ultra-short pulses to broader pulses with flat top.