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

Claim 0:
1. A distorter coefficient updating apparatus 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:
a processor configured to:
perform a non-linear re-distortion processing on the signal after decision according to a first distorter coefficient to generate a first reference signal; and
calculate 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 fed back to the processor as the first distorter coefficient 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 by the processor is a same coefficient as the predistortion coefficient adopted by the non-linear predistorter.