Accurate spectral measurement and wavelength determination are fundamental and vital for many fields. A compact spectrum analyzer with high performance is expected to meet the growing requirements, and speckle-based spectrum analyzer is a potential solution. The basic principle is based on using the random medium to establish a speckle-to-wavelength mapping relationship for spectrum reconstruction. This article introduces current speckle-based spectrum analyzers with different schemes and reviews recent advances in this field. Besides, some applications by using speckle-based spectrum analyzers are also introduced. Finally, the existing challenges and the future prospects of using speckle for spectrum recovery are discussed.

准确的光谱测量和波长确定对于许多领域来说都是至关重要的。高性能的紧凑型频谱分析仪有望满足不断增长的需求，基于斑点的频谱分析仪是一种潜在的解决方案。基本原理是基于使用随机介质建立斑点到波长的映射关系以进行光谱重建的。本文介绍了具有不同方案的当前基于斑点的频谱分析仪，并回顾了该领域的最新进展。此外，还介绍了使用基于斑点的频谱分析仪的一些应用。最后，讨论了使用散斑进行频谱恢复的现有挑战和未来前景。