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This paper introduces the influence of the frequency response of the optical eye diagram analyzer on the test results, and the common methods of the frequency response calibration of the optical eye diagram analyzer. The principle of using femtosecond laser to calibrate the filter frequency response of the optical eye diagram analyzer is analyzed. The femtosecond laser is approximated to the impact function, and the impulse response of the filter can be obtained. The frequency response of the filter is calculated by Fourier transform. A scheme of calibrating filter frequency response of optical eye diagram analyzer with femtosecond laser is proposed. The pulse width and repetition frequency of femtosecond laser are tested. The influence of the stability of femtosecond laser repetition frequency on the test results is analyzed. At the same time, this paper introduces the test results of the frequency response of calibrating the optical eye diagram analyzer by the optical heterodyne method, and comparatively analyzes the optical heterodyne method and the femtosecond laser method. The experimental results show that it is feasible to calibrate the frequency response of the photoelectric module of Oscilloscope by femtosecond laser, and the repeatability of 3dB bandwidth is less than 6%.
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