Cross polarization interface canceler
DC CAFC
First Claim
Patent Images
1. A system comprising:
- a transmitting device to modulate orthogonally polarized optical carriers with independent information bearing waveforms; and
a receiving device including (i) a cross polarization interference canceler that comprises a plurality of optical elements each supporting a transfer function to collectively mitigate cross polarization interference and to reconstruct the information bearing waveforms recovered from the orthogonally polarized optical carriers and (ii) a plurality of receivers each to receive an optical signal from the cross polarization interference canceler.
1 Assignment
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Accused Products
Abstract
Implemented in both coherent and non-coherent optical systems, a receiving device including a cross polarization interference canceler (XPIC) is described. For these embodiments, the XPIC optimizes bandwidth efficiency of an optical communication link by enabling the reconstruction of two optical signals transmitted with generally orthogonal polarization states and routed over a single fiber optic transmission medium in the same frequency band.
109 Citations
37 Claims
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1. A system comprising:
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a transmitting device to modulate orthogonally polarized optical carriers with independent information bearing waveforms; and
a receiving device including (i) a cross polarization interference canceler that comprises a plurality of optical elements each supporting a transfer function to collectively mitigate cross polarization interference and to reconstruct the information bearing waveforms recovered from the orthogonally polarized optical carriers and (ii) a plurality of receivers each to receive an optical signal from the cross polarization interference canceler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
a polarization beam splitter to separate a beam from a local oscillator into the orthogonally polarized optical carriers; - and
a plurality of modulators to independently modulate the orthogonally polarized optical carriers with the information bearing waveforms.
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4. The system of claim 3, wherein the transmitting device further includes a polarization combiner to produce a transmit optical signal for transmission over the optical fiber transmission medium.
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5. The system of claim 2, wherein the orthogonally polarized optical carriers modulated with independent information bearing waveforms and propagated through the optical fiber transmission medium constitute an incoming optical signal to the plurality of receivers.
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6. The system of claim 1, wherein the receiving device further comprises a first polarization beam splitter preceding the cross polarization interference canceler, the first polarization beam splitter to separate a received optical signal field into orthogonally polarized field components.
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7. The system of claim 6, wherein each of the plurality of optical elements associated with the cross polarization interference canceler of the receiving device is a complex optical elements to mitigate the non-ideal effects of the transmitter and optical fiber transmission medium on the received optical signal.
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8. The system of claim 7, wherein the complex optical elements include optical filters.
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9. The system of claim 6, wherein the receiving device includes a second polarization beam splitter to separate a beam from a local oscillator into a plurality of orthogonally polarized field components, a first polarized field component being routed to a first set of one or more receivers and a second polarized field component substantially orthogonal to the first polarized field component being routed to a second set of one or more receivers.
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10. The system of claim 9, wherein the plurality of coherent optical receivers of the receiving device produce a plurality of electrical signals for demodulation, each of the plurality of electrical signals include significant modulation data from only one of the transmitted orthogonally polarized field components.
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11. The system of claim 1, wherein each of the plurality of receivers of the receiving device is an intensity modulation direct detection receiver that receives one of the optical signals from the cross polarization interference canceler.
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12. The system of claim 11, wherein the plurality of intensity modulation direct detection receivers of the receiving device are used to detect wavelength division multiplexed (WDM) signals.
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13. The system of claim 1, wherein each of the plurality of receivers of the receiving device is a coherent optical receiver.
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14. The system of claim 13, wherein at least one of the plurality of coherent optical receivers includes a double balanced optical receiver.
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15. Implemented to receive an incoming optical signal, a receiving device comprising:
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a first polarization beam splitter to separate a received optical signal field of the incoming optical signal into orthogonally polarized components; and
a cross polarization interference canceler following the first polarization beam splitter, the cross polarization interference canceler comprises a plurality of outputs and a plurality of elements each supporting a transfer function, each output of the plurality of outputs being the sum of at least two element outputs. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
a local oscillator;
a second polarization beam splitter in communication with the local oscillator, the second polarization beam splitter to receive an optical signal from the local oscillator; and
one or more demodulators in communication with the cross polarization interference canceler.
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23. The receiver of claim 15, wherein the cross polarization interference canceler includes a plurality of generally complex elements.
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24. The receiving device of claim 15 further comprising at least two optical receivers and at least two demodulators interposed between the at least two optical receivers and the cross polarization interference canceler, the at least two demodulators to translate intermediate frequency (IF) signals into baseband signals.
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25. The receiving device of claim 15, wherein the cross polarization interference canceller further mitigates polarization mode dispersion associated with the incoming optical signals.
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26. A receiving device implemented to receive an incoming optical signal, a receiving device comprising:
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a first polarization beam splitter to separate a received optical signal field of the incoming optical signal into orthogonally polarized components; and
a cross polarization interference canceller (XPIC) in communication with the first polarization beam splitter, the XPIC being an electrical intermediate frequency (IF) XPIC. - View Dependent Claims (27, 28, 29)
mitigating polarization mode dispersion associated with the incoming optical signals.
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30. A method comprising:
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receiving an optical signal over a single fiber optic transmission medium, the optical signal being one or more polarized field components independently modulated with independent information bearing waveforms; and
processing the optical signal by (i) separating the optical field of the optical signal into orthogonally polarized field components, (ii) routing each of the orthogonally polarized field components to a coherent optical receiver to produce a first output and a second output, and (iii) transmitting the first and second outputs to a cross polarization interference canceller (XPIC). - View Dependent Claims (31, 32)
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33. A method comprising:
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receiving an optical signal over a single fiber optic transmission medium, the optical signal being at least two polarized field components independently modulated with independent information bearing waveforms; and
mitigating cross polarization interference associated with the at least two modulated polarized field components to reconstruct the information bearing waveforms using a plurality of matrix coefficients being complex values to apply both amplitude scaling and phase shifting to the at least two modulated polarized field components. - View Dependent Claims (34)
separating an optical field of the optical signal into orthogonally polarized field components; and
processing the orthogonally polarized field components by an optical cross polarization interference canceller.
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35. A method comprising:
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receiving at least two optical signals with independent information bearing waveforms over a single fiber optic transmission medium, the at least two optical signals having been transmitted with generally orthogonal polarization states; and
mitigating cross polarization interference associated with the at least two optical signals to reconstruct the information bearing waveforms, mitigation of the cross polarization interference is accomplished through a matrix multiplication using a cross polarization interference canceler that produces the recovered signals with the minimum mean square error (MMSE) relative to the desired transmitted signals.
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36. A method comprising:
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receiving an optical signal over a single fiber optic transmission medium, the optical signal being one or more polarized field components independently modulated with independent information bearing waveforms; and
processing the optical signal by (i) separating the optical field of the optical signal into orthogonally polarized field components, (ii) processing the orthogonally polarized field components by an optical cross polarization interference canceller (XPIC), (iii) routing outputs of the optical XPIC to coherent optical receivers that convert the outputs into corresponding current outputs, and (iv) demodulating the current outputs to reconstruct baseband waveforms associated with the received optical signal.
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37. A method comprising:
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receiving at least two optical signals with independent information bearing waveforms over a single fiber optic transmission medium, the at least two optical signals having been transmitted with generally orthogonal polarization states; and
eliminating cross polarization interference associated with the at least two optical signals to reconstruct the information bearing waveforms, the elimination of the cross polarization interference is accomplished through matrix multiplication using a diagonalizer cross polarization interference cancellation network being a general inverse of a transmission matrix associated with the transmitter and the single fiber optic transmission medium.
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Specification
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Litigation Data
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Current AssigneeCore Optical Technologies LLC
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Original AssigneeMark T. Core
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InventorsCore, Mark T.
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Primary Examiner(s)Chan, Jason
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Assistant Examiner(s)Bello, Agustin
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Application NumberUS09/434,213Time in Patent Office1,755 DaysField of Search359/192, 359/122, 359/190, 359/142, 359/193, 398/202, 398/204, 398/205, 398/208, 398/65US Class Current398/205CPC Class CodesH04B 10/60 ReceiversH04B 10/614 comprising one or more pola...H04B 10/65 Intradyne, i.e. coherent re...H04B 10/675 for controlling the optical...H04B 10/69 Electrical arrangements in ...
