MEASUREMENT OF SPECTRAL PHASE USING COHERENT LIGHT SPECTRUM ANALYZER OF VARIOUS PHASES

摘要

PROBLEM TO BE SOLVED: To provide a system and a method for complex light spectrum analysis.;SOLUTION: This invention provides a light spectrum analyzer. The light spectrum analyzer (100) contains a receiver (130) for receiving both a local oscillator light signal (110) and an unknown light signal (120). The receiver (130) outputs three or more heterodyne signals of different phases. These signals of different phases are combined with a quadrature generator (140). The quadrature generator (140) generates 1st and 2nd quadrature signals dephased by 90° each other. These 1st and 2nd quadrature signals are combined with a complex signal generator (150). The complex signal generator (150) generates a complex signal having positive and negative images. A measurement processing unit (160) computes the phase of a unknown light signal from a relative difference in phase between the positive and negative images of the complex signal.;COPYRIGHT: (C)2005,JPO&NCIPI