Optical receiver with optical transmitter-specific dispersion post-compensation
First Claim
1. An apparatus comprising:
- a frontend configured to;
convert an optical intensity-modulated (IM) signal associated with a remote optical transmitter into a plurality of analog electrical signals;
determine a plurality of direct current (DC) offsets for the analog electrical signals;
remove the DC offsets from the analog electrical signals to produce a plurality of DC-free analog signals; and
convert the DC-free analog signals into a plurality of DC-free digital signals; and
a digital signal processing (DSP) unit coupled to the frontend and configured to;
perform fiber dispersion compensation on the DC-free digital signals according to a dispersion value associated with the remote optical transmitter to produce a plurality of DC-free compensated digital signals; and
add the DC offsets to the DC-free compensated digital signals to produce a plurality of DC-restored compensated digital signals.
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Accused Products
Abstract
An apparatus comprising a frontend configured to convert an optical IM signal associated with a remote optical transmitter into a plurality of analog electrical signals, determine a plurality of DC offsets for the analog electrical signals, remove the DC offsets from the analog electrical signals to produce a plurality of DC-free analog signals, and convert the DC-free analog signals into a plurality of DC-free digital signals, and a DSP unit coupled to the frontend and configured to perform fiber dispersion compensation on the DC-free digital signals according to a dispersion value associated with the remote optical transmitter to produce a plurality of DC-free compensated digital signals, and add the DC offsets to the compensated digital signals to produce a plurality of DC-restored compensated digital signals.
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Citations
19 Claims
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1. An apparatus comprising:
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a frontend configured to; convert an optical intensity-modulated (IM) signal associated with a remote optical transmitter into a plurality of analog electrical signals; determine a plurality of direct current (DC) offsets for the analog electrical signals; remove the DC offsets from the analog electrical signals to produce a plurality of DC-free analog signals; and convert the DC-free analog signals into a plurality of DC-free digital signals; and a digital signal processing (DSP) unit coupled to the frontend and configured to; perform fiber dispersion compensation on the DC-free digital signals according to a dispersion value associated with the remote optical transmitter to produce a plurality of DC-free compensated digital signals; and add the DC offsets to the DC-free compensated digital signals to produce a plurality of DC-restored compensated digital signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for use in an optical communication device, comprising:
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receiving a first optical signal from a first remote optical transmitter; receiving a second optical signal from a second remote optical transmitter; converting the first optical signal into a plurality of analog electrical signals comprising two orthogonal polarization components, an X-polarization component and a Y-polarization component, wherein the X-polarization component comprises a first in-phase (I) component and a first quadrature-phase (Q) component, and wherein the Y-polarization component comprises a second I component and a second Q component; determining a first direct current (DC) offset for the first I component; determining a second DC offset for the first Q component; removing the first DC offset from the first I component to produce one of a plurality of first digital electrical signals; removing the second DC offset from the first Q component to produce another of the first digital electrical signals; converting the second optical signal into a plurality of second digital electrical signals; compensating the first digital electrical signals according to a first dispersion value associated with the first remote optical transmitter to produce a plurality of first compensated digital electrical signals; compensating the second digital electrical signals according to a second dispersion value associated with the second remote optical transmitter to produce a plurality of second compensated digital electrical signals; adding the first DC offset to one of the first compensated digital electrical signals associated with the first I component; and adding the second DC offset to another of the first compensated digital electrical signals associated with the first Q component. - View Dependent Claims (12, 13, 14, 15)
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16. A method comprising:
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converting an optical intensity-modulated (IM) signal associated with a remote optical transmitter into a plurality of analog electrical signals; determining a plurality of direct current (DC) offsets for the analog electrical signals; removing the DC offsets from the analog electrical signals to produce a plurality of DC-free analog signals; converting the DC-free analog signals into a plurality of DC-free digital signals; performing fiber dispersion compensation on the DC-free digital signals according to a dispersion value associated with the remote optical transmitter to produce a plurality of DC-free compensated digital signals; and adding the DC offsets to the DC-free compensated digital signals to produce a plurality of DC-restored compensated digital signals. - View Dependent Claims (17, 18, 19)
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Specification