Patent ID: 11901951
Assignee: FUJITSU LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A distorter coefficient updating method applied at an optical receiver side where an optical receiver comprises a decider configured to decide a signal before decision to generate a signal after decision, comprising:
performing non-linear re-distortion processing on the signal after decision according to a first distorter coefficient to generate a first reference signal; and
calculating a second distorter coefficient according to the first reference signal and a the signal before decision, or according to the first reference signal, the signal after decision, and the signal before decision, and
wherein the second distorter coefficient is used as the first distorter coefficient of the non-linear re-distortion processing in a next update, and the second distorter coefficient is fed back to a non-linear predistorter on an optical transmitter side as a predistortion coefficient of the non-linear predistorter,
wherein the first distorter coefficient adopted in the non-linear re-distortion processing is a same coefficient as the predistortion coefficient adopted by the non-linear predistorter.