Optical communication apparatus and correcting method
AssigneeFujitsu Optical Components Limited
InventorToshio Ishii
Life of this patent
Estimating the term…
Abstract
An optical communication apparatus includes a level detector, an FIR filter, and a adjustor. The level detector detects level information that discriminates a change in a multi-value level based on an input signal used in a multi-value amplitude modulation system. The FIR filter compensates a signal band of the input signal in accordance with tap coefficients of a plurality of multipliers. The adjustor corrects the tap coefficient of each of the multipliers included in the FIR filter based on the level information detected in the level detector.
Claims9
An optical communication apparatus comprising:
- a level detector that detects level information that discriminates a change in a multi-value level based on an input signal used in a multi-value amplitude modulation system;
- an FIR filter that compensates a signal band of the input signal in accordance with tap coefficients of a plurality of multipliers;
- a digital to analog converter that performs analog conversion on an output signal of the FIR filter;
- a driver that outputs a driving signal in accordance with the output signal that has been subjected to analog conversion;
- an optical modulator that performs optical conversion on the output signal in accordance with the driving signal of the driver;
- and
- an adjustor that corrects, based on the level information detected in the level detector, the tap coefficient of each of the multipliers included in the FIR filter so as to compensate nonlinear static characteristics of the digital to analog converter, the driver, and the optical modulator.
A correcting method performed by an optical communication apparatus, the correcting method comprising:
- detecting level information that discriminates a change in a multi-value level based on an input signal used in a multi-value amplitude modulation system;
- compensating a signal band of the input signal in accordance with tap coefficients of a plurality of multipliers included in an FIR filter;
- performing analog conversion on an output signal of the FIR filter;
- outputting a driving signal in accordance with the output signal that has been subjected to analog conversion;
- performing optical conversion on the output signal in accordance with the driving signal of the outputting;
- and
- correcting the tap coefficient of each of the multipliers included in the FIR filter based on the detected level information so as to compensate nonlinear static characteristics of the performing analog conversion, the outputting, and the performing optical conversion.
An optical communication apparatus comprising:
- a level detector that detects level information that discriminates a change in PAM-N symbol levels based on an input signal used in a N-level pulse amplitude modulation system, where N is any integer that is the nth power of 2;
- an FIR filter that compensates a signal band of the input signal in accordance with tap coefficients of a plurality of multipliers;
- a digital to analog converter that performs analog conversion on an output signal of the FIR filter;
- a driver that outputs a driving signal in accordance with the output signal that has been subjected to analog conversion;
- an optical modulator that performs optical conversion on the output signal in accordance with the driving signal of the driver;
- and
- an adjustor that corrects, based on the level information detected in the level detector, the tap coefficient of each of the multipliers included in the FIR filter so as to compensate nonlinear static characteristics of the digital to analog converter, the driver, and the optical modulator.
A correcting method performed by an optical communication apparatus, the correcting method comprising:
- detecting level information that discriminates a change in PAM-N symbol levels based on an input signal used in a N-level pulse amplitude modulation system, where N is any integer that is the nth power of 2;
- compensating a signal band of the input signal in accordance with tap coefficients of a plurality of multipliers included in an FIR filter;
- performing analog conversion on an output signal of the FIR filter;
- outputting a driving signal in accordance with the output signal that has been subjected to analog conversion;
- performing optical conversion on the output signal in accordance with the driving signal of the outputting;
- and
- correcting the tap coefficient of each of the multipliers included in the FIR filter based on the detected level information so as to compensate nonlinear static characteristics of the performing analog conversion, the outputting, and the performing optical conversion.
Dependencies are inferred from the claim text.