Methods and apparatus for optical communications via pulse amplitude modulation (pam) in dense wavelength-division multiplexing (dwdm) systems
AssigneeJuniper Networks, Inc.
InventorsYang YUE, Qiang WANG, Zhen QU, Xiao HAN
Life of this patent
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Abstract
A method includes applying, to a modulated digital signal, a forward error correction (FEC) including a low-density parity-check (LDPC) to produce a coded digital signal. Nyquist shaping is applied to the coded digital signal to generate a filtered digital signal. A representation of the filtered digital signal is transmitted in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.
Claims20
A method, comprising:
- applying, to a modulated digital signal, a forward error correction (FEC) including a low-density parity-check (LDPC) to produce a coded digital signal;
- applying Nyquist shaping to the coded digital signal to generate a filtered digital signal;
- and
- transmitting a representation of the filtered digital signal in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.
A non-transitory computer readable storage medium storing data representing software executable by a computer, the software including instruction to:
- apply, to a modulated digital signal, a forward error correction (FEC) to produce a coded digital signal;
- apply Nyquist shaping to the coded digital signal to generate a filtered digital signal;
- and
- transmit a representation of the filtered digital signal in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.
An apparatus, comprising:
- an encoder configured to apply a forward error correction (FEC) to a modulated digital signal to generate a coded digital signal;
- a digital filter operatively coupled to the encoder and configured to apply Nyquist shaping to the coded digital signal to generate a filtered digital signal;
- and
- a digital to analog converter (DAC) operatively coupled to the digital filter, the DAC configured to send a representation of the filtered digital signal into an optical communication channel.
Dependencies are inferred from the claim text.