Measurement of spectral response of group retardation in optical frequency with fixed optical carrier involves performing optical spectral sweeping on frequency of electrical signal enclosed in amplitude of fixed optical carrier

摘要

The method involves measuring group retardation characteristic of an optical frequency of an optical device. The frequency of an electrical signal, enclosed in the amplitude of a fixed optical carrier, is swept through optical spectral sweeping. The phase of the detected signal is measured and divided into units in the middle of a general purpose interface bus (GPIB) or analog bus. The optical device has a fiber or network of Bragg diffraction and a tunable optical source which are required in general and based on an actual standard method. In combination with the measurement of the phase of the detected signal at the frequency of a modulated signal with continuous level, a modulator is used for canceling the detected signal at each of the modulated frequency in the effected barrier.