Device and method for measuring phase spectrum of comb-shaped spectrum generator

Abstract

The invention relates to a device for measuring a phase spectrum of a comb-shaped spectrum generator. The device comprises a reference signal output end for outputting a first microwave signal and a signal input end for inputting a comb-shaped spectrum signal synchronized with a femtosecond pulse laser beam, and further comprises a first microwave signal source, a second microwave signal source, a GSG microwave probe, a coplanar waveguide, a femtosecond pulse laser, a wave chopper, a polarizer, an optical delay line, a lambda / 2 wave plate, a polarized light compensator, a lambda / 4 wave plate, a polarized light separator, a balanced photoelectric detector, a lock-in amplifier, a control and calculation unit and a function generator. The device has the following advantages: the time-domain waveform of the comb-shaped spectrum generator can be accurately measured based on the photoelectric technology, so that the phase spectrum of the comb-shaped spectrum generator is obtained. The device can theoretically measure the comb-shaped spectrum generator with 110 GHz of band width, and has the advantages such as little correction processing and complete tracing chain compared with the traditional method for measuring the phase spectrum of the comb-shaped spectrum generator.

Description

technical field

[0001] The invention relates to a phase spectrum measuring device, in particular to a device and method for measuring the phase spectrum of a comb spectrum generator. Background technique

[0002] The traditional method to obtain the phase spectrum of the comb spectrum generator is: use an oscilloscope to measure the time domain waveform of the comb spectrum generator, and check the time base distortion, time base jitter and impedance mismatch, and the impact response of the oscilloscope itself in the oscilloscope measurement. The influence is corrected to obtain a more accurate time-domain signal waveform, and then the signal is Fourier transformed to obtain the phase spectrum of the comb spectrum generator. The bottleneck of this measurement device is that a large number of complex corrections are required, the measurable bandwidth of the comb spectrum generator is limited by the bandwidth of the oscilloscope itself, and a complete traceability chain cannot...

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