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US 9,281,915 B2Granted
Optical polarization demultiplexing for a coherent-detection scheme
AssigneeAlcatel Lucent
InventorNoriaki Kaneda
Life of this patent
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Abstract
An optical receiver having a plurality of optical IQ modulators arranged in a butterfly configuration and configured to operate as an optical polarization de-multiplexer. The optical receiver further has (i) an opto-electric circuit configured to apply optical homodyne detection to an optical input signal received by the optical receiver and (ii) a controller configured to generate one or more control signals for driving the IQ modulators of the plurality based on one or more electrical feedback signals received from the opto-electric circuit.
Claims20
An apparatus comprising:
- a first optical IQ modulator configured to modulate a first portion of a first polarization of an optical polarization-division-multiplexed, “PDM,” signal to generate a first modulated optical signal;
- a second optical IQ modulator configured to modulate a second portion of the first polarization of the optical PDM signal to generate a second modulated optical signal;
- a third optical IQ modulator configured to modulate a first portion of a second polarization of the optical PDM signal to generate a third modulated optical signal;
- and
- a fourth optical IQ modulator configured to modulate a second portion of the second polarization of the optical PDM signal to generate a fourth modulated optical signal, wherein the apparatus is configured to:
- combine the first modulated optical signal and the third modulated optical signal to generate a first optical output signal;
- and
- combine the second modulated optical signal and the fourth modulated optical signal to generate a second optical output signal.
5 more elements
A method of polarization rotation comprising:
- modulating a first portion of a first polarization of an optical polarization-division-multiplexed, “PDM,” signal in a first optical IQ modulator to generate a first modulated optical signal;
- modulating a second portion of the first polarization of the optical PDM signal in a second optical IQ modulator to generate a second modulated optical signal;
- modulating a first portion of a second polarization of the optical PDM signal in a third optical IQ modulator to generate a third modulated optical signal;
- modulating a second portion of the second polarization of the optical PDM signal in a fourth optical IQ modulator to generate a fourth modulated optical signal;
- combining the first modulated optical signal and the third modulated optical signal to generate a first optical output signal;
- and
- combining the second modulated optical signal and the fourth modulated optical signal to generate a second optical output signal.
4 more elements
Dependencies are inferred from the claim text.