Method for generating duobinary signal and optical transmitter using the same method
AssigneeNEC Corporation
InventorsTakashi Ono, Yutaka Yano
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for generating a duobinary signal which has the step of: modulating individually an intensity and a phase of a carrier wave. Also disclosed is a duobinary-manner optical transmitter which has: a laser device which outputs signal light; an optical intensity modulator which intensity-modulates the signal light according to a first data signal generated by dividing a data signal into two signals; a precoder which inputs a second data signal generated by dividing the data signal into two signals; and an optical phase modulator which phase-modulates the intensity-modulated signal light according to a signal which is obtained delaying 0.5 bit an output signal of the precoder.
Claims15
A method for generating a duobinary signal, comprising the steps of:
- dividing a binary data signal into a first binary data signal and a second binary data signal;
- inputting said first binary data signal into an optical intensity modulator;
- inputting said second binary data signal into an optical phase modulator;
- and
- modulating individually an intensity of a carrier wave, using said optical intensity modulator, and a phase of said carrier wave, using said optical phase modulator, and outputting a duobinary signal for transmission on said carrier wave.
A duobinary-manner optical transmitter, comprising:
- a laser device which outputs signal light;
- an optical intensity modulator which intensity-modulates said signal light according to a first binary data signal;
- a precoder which inputs a second binary data signal;
- and
- an optical phase modulator which phase-modulates said intensity-modulated signal light according to a binarm signal which is obtained by delaying by 0.5 bit an output binary signal of said precoder.
A duobinary-manner optical transmitter, comprising:
- a laser device which outputs signal light;
- an optical intensity modulator which intensity-modulates said signal light according to a first binary data signal;
- a precoder which inputs a second binary data signal;
- and
- an optical phase modulator which phase-modulates said intensity-modulated signal light according to a binary signal which is obtained by delaying by 0.5 bit an output binary signal of said precoder;
- wherein a waveform of said signal light is varied by changing an operating point of said optical intensity modulator.
A duobinary-manner optical transmitter, comprising:
- a laser device which outputs signal light;
- an optical intensity modulator which intensity-modulates said signal light according to a first binary data signal;
- a precoder which inputs a second binary data signal;
- and
- an optical phase modulator which phase-modulates said intensity-modulated signal light according to a binary signal which is obtained by delaying by 0.5 bit an output binary signal of said precoder;
- wherein a waveform of said first binary data signal is varied through a non-linear electric circuit.
A duobinary-manner optical transmitter, comprising:
- a laser device which outputs signal light;
- an optical intensity modulator which intensity-modulates said signal light according to a first binary data signal;
- a precoder which inputs a second binary data signal;
- and
- a phase modulator which phase-modulates said signal light according to said second binary data signal.
Dependencies are inferred from the claim text.