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1·String.sign Gets absolute, minimum, maximum and sign of string value -1.abs returns 1.

string . sign得到字符串值的绝对、最小、最大和sign值- 1 . abs返回1。

2·And it decreases also with the increase of absolute value of the initial pulse chirp coefficient, but has no relation with the sign of chirping coefficient.

系统的输出信号的偏振度还随着信号原始啁啾系数绝对值的增大而减小，但与啁啾系数的符号无关。