Method for measuring electro-optic phase modulator modulation factor

An electro-optical phase modulation and modulation coefficient technology, applied in the field of optoelectronics, can solve the problems of separate calibration of photodetector frequency response, etc., to avoid the influence of photodetector response, improve stability, and realize the effect of self-calibration measurement

Active Publication Date: 2014-07-16
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the frequency response of the photodetector needs to be calibrated separately in the electrical domain measurement method of the modulation coefficient of the electro-optical phase modulator, the purpose of the present invent

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  • Method for measuring electro-optic phase modulator modulation factor
  • Method for measuring electro-optic phase modulator modulation factor
  • Method for measuring electro-optic phase modulator modulation factor

Examples

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Example Embodiment

[0062] Example 1

[0063] Set the output wavelength of laser 1 to λ 0 =1553.60nm (corresponding to frequency f 0 =193.1THz), taking one of the measurement frequency points as an example, the frequency f of the sinusoidal signal output by the first signal source 8 1 =10GHz, the frequency f of the sinusoidal signal output by the second microwave signal source 9 2 =4.97GHz, the frequency f of the sinusoidal signal output by the third signal source 11 s =0.07GHz, the frequency in the signal of the output signal of the optical fiber interferometer under the action of the above three sinusoidal signals recorded by the sampling circuit 10 is 4.96GHz (f 1 -f 2 -f s ), 5.1GHz (f 1 -f 2 +f s ), 4.9GHz (f 2 -f s ), 5.04GHz (f 2 +f s ), denoted as i(f 1 -f 2 +f s ), i(f 1 -f 2 -f s ), i(f 2 +f s ), i(f 2 -f s ); figure 2 In this embodiment, the amplitude values ​​of the above-mentioned four frequencies recorded on the sampling circuit 10 are obtained by using the m...

Example Embodiment

[0068] Example 2

[0069] Set the output wavelength of laser 1 to λ 0 =1551.19nm (corresponding to frequency f 0 =193.4THz), taking one of the measurement frequency points as an example, the frequency f of the sinusoidal signal output by the first signal source 8 1 =20GHz, the frequency f of the sinusoidal signal output by the second microwave signal source 9 2 =9.9GHz, the frequency f of the sinusoidal signal output by the third signal source 11 s =0.08GHz, the frequency in the signal of the output signal of the optical fiber interferometer under the action of the above three sinusoidal signals recorded by the sampling circuit 10 is 9.82GHz (f 2 -f s ), 9.98GHz (f 2 +f s ), 10.02GHz (f 1 -f 2 -f s ), 10.18GHz (f 1 -f 2 +f s ), denoted as i(f 2 -f s ), i(f 2 +f s ), i(f 1 -f 2 -f s ), i(f 1 -f 2 +f s ); Figure 4 In this embodiment, the amplitude values ​​of the above-mentioned four frequencies recorded on the sampling circuit 10 are obtained by using th...

Example Embodiment

[0074] Example 3

[0075] Set the output wavelength of laser 1 to λ 0 =1550.55nm (corresponding to frequency f 0 =193.48THz), taking one of the measurement frequency points as an example, set the frequency f of the sinusoidal signal output by the first signal source 8 1 =15GHz, the frequency f of the sinusoidal signal output by the second microwave signal source 9 2 =7.46GHz, the frequency f of the sinusoidal signal output by the third signal source 11 s =0.1GHz, the frequency in the signal of the output signal of the optical fiber interferometer under the action of the above three sinusoidal signals recorded by the sampling circuit 10 is 7.44GHz (f 1 -f 2 -f s ), 7.64GHz (f 1 -f 2 +f s ), 7.36GHz (f 2 -f s ), 7.56GHz (f 2 +f s ), denoted as i(f 1 -f 2 +f s ), i(f 1 -f 2 -f s ), i(f 2 +f s ), i(f 2 -f s ); Image 6 In this embodiment, the amplitude values ​​of the above-mentioned four frequencies recorded on the sampling circuit 10 are obtained by using ...

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Abstract

The invention discloses a method for measuring an electro-optic phase modulator modulation factor, and relates to the technical field of the photoelectronic technique. In order to solve the problems that phase modulation signals cannot be directly detected on a photoelectric detector and nonlinearity cannot be omitted in PM-IM and FM-IM conversion processes, an optical fiber interferometer is adopted as a measuring device and composed of a beam splitter, an electro-optic phase modulator to be measured, an acousto-optic frequency shifter, an auxiliary electro-optic phase modulator and a beam combiner, wherein the electro-optic phase modulator to be measured is arranged on one interference arm of the optical fiber interferometer, the acousto-optic frequency shifter and the auxiliary electro-optic phase modulator are placed on the other interference arm of the optical fiber interferometer, and sinusoidal signals with different frequencies are loaded to the electro-optic phase modulator to be measured, the acousto-optic frequency shifter and the auxiliary electro-optic phase modulator respectively. Frequency response of the photoelectric detector is eliminated by setting a frequency relation of the loaded sinusoidal signals, self-calibration measurement is achieved, measuring accuracy of the electro-optic phase modulator modulation factor is improved, and the method has good application value.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, and more specifically designs an electro-optic phase modulator modulation coefficient that solves the problem that the phase modulation signal cannot be directly detected on the photodetector and avoids the nonlinear process in the conversion of PM-IM and FM-IM measurement method. Background technique [0002] The electro-optic phase modulator is one of the key devices in the optical fiber communication system. The electro-optical phase modulator has the advantages of no bias and linear modulation. It is used in high-speed optical fiber communication and coherent optical communication systems, especially the optical play an integral role in signal generation. The modulation coefficient of the electro-optic phase modulator is one of the important characteristic parameters of the electro-optic phase modulator, which reflects the modulation efficiency of the electro-optic phase modulator, a...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 张尚剑王恒邹新海尹欢欢张雅丽刘永
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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