Method and apparatus for detecting chromatic dispersion, and method and apparatus for compensating chromatic dispersion

摘要

A method of monitoring chromatic dispersion when transmitting an optical signal includes: applying, to an optical signal in which the symbol rate is f, a dip in optical intensity for every n symbols by means of pseudo-RZ modulation where n is an integer equal to or greater than 2, and transmitting the optical signal to which dips have been applied to a transmission path; receiving the optical signal that is transmitted in by the transmission path and detecting the intensity of a frequency component of k*f/n from the received signal where k is an integer equal to or greater than 1; and based on the detected intensity, generating a monitor signal that represents the chromatic dispersion amount.

主权项

1. A method of monitoring chromatic dispersion when transmitting an optical signal, the method comprising:
applying, to an optical signal in which a symbol rate is f, a dip in optical intensity for every n symbols where n is an integer equal to or greater than 2; transmitting the optical signal to which dips have been applied to a transmission path; receiving said optical signal that is transmitted on said transmission path and detecting intensity of a frequency component of k*f/n from the received signal where k is an integer equal to or greater than 1; and based on said detected intensity, generating a monitor signal that represents a chromatic dispersion amount, wherein an optical intensity at the applied dips is lower than an optical intensity of any of the symbols of said optical signal, and wherein a time width of each of the applied dips is sufficiently short, such that optical amplitudes of central parts of said symbols of said optical signal are not modified.