Modulation scheme with increased number of states of polarization
AssigneeAlcatel Lucent
InventorHenning Buelow
Life of this patent
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Abstract
A modulation method for optical communication comprises the step of generating an optical signal modulated between a plurality of different states of polarization and between different phase states. The plurality of states of polarization comprises first states of polarization. The first states of polarization define a single great circle on the Poincaré sphere. The method is characterized in that the plurality of states of polarization further comprise one or more second states of polarization located outside the great circle. Such additional second states of polarization increase the symbol alphabet.
Claims11
A modulation method for optical communication, comprising the step:
- generating an optical signal modulated between a plurality of different states of polarization and between different phase states,
- wherein the states of polarization do not all lie on a same great circle on the Poincaré sphere,
- wherein the plurality of states of polarization comprises:
- first states of polarization defining a single great circle on the Poincaré sphere, and
- one or more second states of polarization outside the great circle, and
- wherein
- in a second state of polarization one of two orthogonal polarization components of the optical signal is deactivated.
A transmitter for optical communication, comprising
- means for generating an optical signal modulated between a plurality of different states of polarization and between different phase states,
- wherein the plurality of states of polarization comprises first states of polarization defining a single great circle on the Poincaré sphere,
- wherein the plurality of states of polarization further comprises one or more second states of polarization outside the great circle
- wherein
- the means for generating the optical signal are configured in such a way that one of two orthogonal polarization components of the optical signal is deactivated in a second state of polarization.
Dependencies are inferred from the claim text.