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The very high transmission rates currently in use in optical communication systems make optical spectrum measurement one of the most useful tools for the diagnostic and monitoring of transmitted signals, with modulation frequencies approaching values that may be resolved by optical methods. Also, the generalization of wavelength-division-multiplexing techniques for greater bandwidth in optical communication systems demands improved optical spectrum measurements. These must combine both high-resolution and broad ranges in the spectral domain as well as high sensitivity and dynamic range in the optical power domain.