Hi,
I need your help regarding my project attached , it just consists of a CW laser , single mode fiber of length 20 KM and PD but when i change the bit rate ,the sequence length and the samples per bit , a strange dispersion appears and only at high frequency although the fiber the length is small , so i dont know what kind of dispersion or noise is this .. and a small note , i say its dispersion because if i turn off the group velocity dispersion this noise disappears completely .. thanks in advance.
