Method and apparatus for optical data transmission at high data rates with enhanced capacity using polarization multiplexing
First Claim
1. An optical data signal transmitter comprising:
- at least one optical carrier generator, each generating an optical carrier signal having two side frequencies derived from a source frequency;
at least one data modulator for modulating data onto the at least one optical carrier signal, creating at least one optical data signal including modulated data and having a first polarization state; and
at least one polarization transformer for encoding a portion of the modulated data and a first of the two side frequencies of the at least one optical data signal with a second polarization state, the second polarization state being orthogonal to the first polarization state.
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Accused Products
Abstract
A system and method for enhancing data capacity in optical data communication are described. First data is modulated onto a first optical carrier to occupy a data frequency range. The first optical carrier includes a first side frequency separated from the frequency range of the data band. A first modulated carrier having a first polarization state is output. Second data is modulated onto a second optical carrier signal occupying the same data frequency range. The second optical carrier includes a second side frequency separated from the data frequency range of the data band in a direction opposite from the first side frequency. A second modulated carrier having a first polarization state is output. The polarization state of the second modulated carrier is changed to a second polarization state orthogonal to the first polarization state and the first modulated carrier is combined with the second modulated carrier into a combined carrier. The combined carrier is optically transmitted to a receiver, in which the first data having the first polarization state is extracted from the second data having the second polarization state.
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Citations
34 Claims
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1. An optical data signal transmitter comprising:
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at least one optical carrier generator, each generating an optical carrier signal having two side frequencies derived from a source frequency;
at least one data modulator for modulating data onto the at least one optical carrier signal, creating at least one optical data signal including modulated data and having a first polarization state; and
at least one polarization transformer for encoding a portion of the modulated data and a first of the two side frequencies of the at least one optical data signal with a second polarization state, the second polarization state being orthogonal to the first polarization state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 34)
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16. A method of increasing the data capacity of optical transmission, comprising the steps of:
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generating at least one optical carrier signal, each signal having two side frequencies derived from a source frequency;
modulating data onto the at least one optical carrier signal, creating at least one optical data signal including modulated data and having a first polarization state; and
encoding a portion of the modulated data and a first of the two side frequencies of the at least one optical data signal with a second polarization state, the second polarization state being orthogonal to the first polarization state.
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22. An optical receiver, comprising:
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an optical splitter for splitting an incoming optical data signal into a first optical data sub-signal and a second optical data sub-signal, each of the sub-signals including a first side carrier frequency having a first polarization state, a second side carrier frequency having a second polarization state, and a central information band, the central information band including first data having the first polarization state and second data having the second polarization state; and
a frequency differentiator, the differentiator acting on the first and second side carrier frequencies differently, enabling the first side carrier frequency and the first data to be separated from the second side carrier frequency and the second data. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. An optical data communication system, comprising:
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an optical data signal transmitter, including;
at least one optical carrier generator, each generating an optical carrier signal having two side frequencies derived from a source frequency;
at least one data modulator for modulating data onto the optical carrier signal, creating an optical data signal including modulated data and having a first polarization state; and
at least one polarization transformer for encoding a portion of the modulated data and a first of the two side frequencies of the at least one optical data signal with a second polarization state, the second polarization state being orthogonal to the first polarization state;
an optical fiber for carrying the optical data signal; and
an optical receiver for receiving the optical data signal. - View Dependent Claims (32)
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33. A method for enhancing data capacity in optical data communication, comprising the steps of:
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modulating first data onto a first optical carrier onto a data band occupying a data frequency range, the first optical carrier including a first side frequency separated from the frequency range of the data band, resulting in a first modulated carrier having a first polarization state;
modulating second data onto a second optical carrier onto a data band occupying the data frequency range, the second optical carrier including a second side frequency separated from the data frequency range of the data band in a direction opposite from the first side frequency, resulting in a second modulated carrier having a first polarization state;
changing the polarization state of the second modulated carrier to a second polarization state orthogonal to the first polarization state;
combining the first modulated carrier with the second modulated carrier into a combined carrier;
optically transmitting the combined carrier;
receiving the transmitted carrier; and
extracting the first data having the first polarization state from the second data having the second polarization state.
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Specification