Back to results
US 2015/0086216 A1Published application
Level Spacing For M-PAM Optical Systems With Coherent Detection
AssigneeAlcatel-Lucent USA Inc.
InventorsChongjin Xie, Po Dong, Peter Winzer
Life of this patent
Estimating the term…
Abstract
An apparatus includes an optical transmitter configured to provide an optical signal amplitude-modulated among M different levels. A constellation control module is configured to provide a drive signal to control the optical signal. A feedback module is configured to receive a measure of spacing between amplitude peaks of a symbol constellation of the optical signal. The feedback module is further configured to regulate the constellation control module to adjust the optical signal in response to the measure of spacing.
Claims20
An apparatus, comprising:
- an optical transmitter configured to provide an optical signal amplitude-modulated among M different levels;
- a constellation control module configured to provide a drive signal to control the optical signal;
- and
- a feedback module configured to receive a measure of spacing between amplitude peaks of a symbol constellation of the optical signal and to regulate the constellation control module to adjust the optical signal in response to the measure of spacing.
1 more element
An apparatus, comprising:
- an optical receiver configured to demodulate a received optical signal and to produce a symbol constellation therefrom;
- an constellation characterization module configured to determine a spacing between amplitude peaks of the symbol constellation, and to provide a measure of the spacing.
An method, comprising:
- configuring an optical transmitter to provide an optical signal amplitude-modulated among M different levels;
- configuring a constellation control module to control a drive signal to control the optical signal;
- and
- configuring a feedback module to receive a measure of spacing between amplitude peaks of a symbol constellation of the optical signal and to regulate the constellation control module to adjust the optical signal in response to the measure of spacing.
1 more element
Dependencies are inferred from the claim text.