Coherent light is the most popular carrier of a signal in an optical information processing system. The matched filtering system (Van Der Lugt 1965) is a prominent example. However, coherent optics is experimentally delicate, not well suited for unfriendly environments. As a reaction to this dilemma some new systems, that use totally incoherent light, have been presented recently. Those systems work reasonably well. But they can handle only real-valued non-negative signal, directly.
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机译：相干光是光学信息处理系统中最流行的信号载体。匹配的过滤系统（Van Der Lugt 1965）是一个突出的例子。然而，相干光学在实验上是微妙的，不适用于不友好的环境。作为对这种困境的一种反应，最近已经提出了一些使用完全不相干光的新系统。这些系统运行良好。但是它们只能直接处理实值的非负信号。
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