[ Huaqiang Security Network News ] The above describes some important performance indicators of optical transceivers . Let us introduce some other video performance indicators of optical transceivers. 
G. Differential Gain Distortion (DG)
Since the amplitude of the image brightness signal causes distortion of the amplitude of the chrominance signal, the magnitude of the distortion is expressed in percentage (%), and the smaller the absolute value, the better.
H. Differential phase distortion (dp)
Due to the amplitude variation of the image brightness signal, the phase of the chrominance signal is distorted. The magnitude of the distortion is expressed in degrees, and there is positive and negative, and the absolute value is as small as possible. The effect of differential phase distortion and differential gain distortion on the image: color saturation distortion under different brightness backgrounds, affecting the color effect, such as wearing bright red clothes from dark to bright, bright red clothes become thicker or lighter.
L. Chromaticity - the brightness gain difference, the unit is decibel (dB), the value is positive and negative, the closer to 0, the better, the effect on the image: the value is too large to cause the image saturation change.
M. Chromaticity - the brightness delay difference, the unit is ns, the value is positive and negative, the closer to O, the better, the value is too large to cause image color striing, which is extremely damaging to the image;
0. The unit of the group delay is nS, the value is positive and negative, the closer to 0, the more the distortion affects the image quality performance: such as the deterioration of the definition, color edging and other undesirable phenomena.
The definition of the PK coefficient is a systematic method for measuring image damage based on different evaluations of various waveform distortions. Expressed as a percentage, the smaller the absolute value, the better.
The effect of the K system value on the image is too large:
1 image out of multiple contours, causing ghosting, which reduces the sharpness; 2 image adjustment fades, edge contour is unclear;
3 The brightness of the vertical direction of the image is not uniform, the background brightness is not true; 4 images flash:
5 The image is unclear in the horizontal direction, causing horizontal smearing when it is severe.
Since the amplitude of the image brightness signal causes distortion of the amplitude of the chrominance signal, the magnitude of the distortion is expressed in percentage (%), and the smaller the absolute value, the better.
H. Differential phase distortion (dp)
Due to the amplitude variation of the image brightness signal, the phase of the chrominance signal is distorted. The magnitude of the distortion is expressed in degrees, and there is positive and negative, and the absolute value is as small as possible. The effect of differential phase distortion and differential gain distortion on the image: color saturation distortion under different brightness backgrounds, affecting the color effect, such as wearing bright red clothes from dark to bright, bright red clothes become thicker or lighter.
L. Chromaticity - the brightness gain difference, the unit is decibel (dB), the value is positive and negative, the closer to 0, the better, the effect on the image: the value is too large to cause the image saturation change.
M. Chromaticity - the brightness delay difference, the unit is ns, the value is positive and negative, the closer to O, the better, the value is too large to cause image color striing, which is extremely damaging to the image;
0. The unit of the group delay is nS, the value is positive and negative, the closer to 0, the more the distortion affects the image quality performance: such as the deterioration of the definition, color edging and other undesirable phenomena.
The definition of the PK coefficient is a systematic method for measuring image damage based on different evaluations of various waveform distortions. Expressed as a percentage, the smaller the absolute value, the better.
The effect of the K system value on the image is too large:
1 image out of multiple contours, causing ghosting, which reduces the sharpness; 2 image adjustment fades, edge contour is unclear;
3 The brightness of the vertical direction of the image is not uniform, the background brightness is not true; 4 images flash:
5 The image is unclear in the horizontal direction, causing horizontal smearing when it is severe.
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