Back to results
US 2014/0233949 A1Published application
Optical communication based on polarization dependent coherent optical nyquist frequency division multiplexing
AssigneeZTE Corporation
InventorsHung-Chang Chien, Jianjun Yu, Ze Dong
Life of this patent
Estimating the term…
Abstract
An optical transmitter transmits a dual polarization optical Nyquist frequency domain multiplexed signal. The signal includes a first polarization component and a second polarization component. Each component comprises multiple subchannels, possibly having different subchannel bandwidths and different modulation schemes. An optical receiver receives the signal and recovers transmitted data.
Claims19
An optical communications method for receiving and processing an optical signal at an optical receiver, comprising:
- receiving an optical Nyquist Frequency domain Multiplexing (NFDM) signal comprising a first polarization component and a second polarization component that is differently polarized with respect to the first polarization component, wherein each of the first and second polarization components include multiple subchannels, each subchannel comprising a carrier modulated with a corresponding modulation scheme;
- separating the received optical NFDM signal into a plurality of received signal components, each received signal component corresponding to a different one of the multiple subchannels;
- and
- processing the plurality of received signal components through a plurality of receive chains, wherein each receive chain includes a carrier recovery stage that recovers carrier information and a re-timing stage that generates timing information for demodulation of the optical NFDM signal.
1 more element
An optical communication apparatus, comprising:
- an optical front end that receives an optical Nyquist Frequency domain Multiplexing (NFDM) signal comprising a first polarization component and a second polarization component that is differently polarized with respect to the first polarization component, wherein each of the first and second polarization components include multiple subchannels, each subchannel comprising at least one subcarrier;
- a polarization detector that separates the received optical NFDM signal into a plurality of received signal components, each received signal component corresponding to a different one of the multiple subchannels;
- and
- a multi-band signal processor that processes the plurality of received signal components through a plurality of receive chains, wherein each receive chain includes a carrier recovery stage that recovers carrier information and a re-timing stage that generates timing information for demodulation of the optical NFDM signal.
1 more element
An optical communications method, comprising:
- modulating a plurality of carriers using input data;
- and
- generating an optical signal comprising a first polarized component and a second polarized component that is differently polarized with respect to the first polarized component, wherein the first polarized component and the second polarized component each comprise a plurality of frequency domain multiplexed subchannels, each subchannel corresponding to one of the plurality of modulated carriers.
An optical communications apparatus, comprising:
- a data modulator that modulates a plurality of carriers using input data;
- and
- a signal generator that generates an optical signal comprising a first polarized component and a second polarized component that is differently polarized with respect to the first polarized component, wherein the first polarized component and the second polarized component each comprise a plurality of frequency domain multiplexed subchannels, each subchannel corresponding to one of the plurality of modulated carriers.
A technique for transmitting or receiving optical signals, as disclosed in this document.
An optical communication system comprising:
- a transmitter configured to generate a dual polarized coherent optical Nyquist Frequency domain Multiplexing (NFDM) signal comprising a first component and a second component that is orthogonally polarized with respect to the first component, wherein each of the first and second components include multiple subchannels, each subchannel comprising a carrier modulated with a corresponding modulation scheme;
- and
- a receiver configured to receive and demodulate the dual polarized NFDM signal using a plurality of receive chains, wherein each receive chain corresponds to a subchannel, such that a subchannel having a best signal to noise ratio is used to control carrier frequency and timing recover of all receive chains.
Dependencies are inferred from the claim text.