Fibre-optic communication based on dual-rail and polarization encoding
AssigneeNokia Technologies Oy
InventorsDavid Bitauld, Hongwei Li, Antti Niskanen
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Abstract
According to an example aspect, there is provided an apparatus comprising a first optical converter coupled to a fiber interface and to two waveguides, a dual rail encoder configured to encode dual rail form light from the two waveguides with payload information, and wherein the dual rail encoder is coupled to the first optical converter or to a second optical converter disposed between the dual rail encoder and the fiber interface, and wherein the first optical converter or the second optical converter is coupled so as to provide polarization encoded light into the fiber interface.
Claims21
An apparatus comprising:
- a first optical converter arranged to receive polarization encoded light from a fibre interface, to convert the polarization encoded light into dual rail form light and to output the dual rail form light into two waveguides;
- a dual rail encoder configured to encode the dual rail form light from the two waveguides with payload information and to modify the dual rail form light to correct, based on adjustment information concerning a fibre, for polarization rotation caused by the fibre, and
- wherein an output of the dual rail encoder is coupled to the first optical converter or to a second optical converter disposed between the dual rail encoder and the fibre interface, and wherein the first optical converter or the second optical converter is coupled so as to convert the dual rail form light from the dual rail encoder into polarization encoded light and to provide this polarization encoded light into the fibre interface.
An apparatus comprising:
- a fibre interface configured to provide light from a light source to the fibre;
- a detector configured receive light from the fibre interface and to measure at least one quantity of the received light,
- at least one processing core configured to communicate adjustment information concerning polarization rotation caused by the fibre via an interface distinct from the fibre interface;
- and
- at least one polarization compensation stage configured to, at least in part, correct for polarization rotation caused by the fibre based at least in part on the adjustment information, wherein the at least one polarization compensation stage is comprised in a dual rail encoder configured to receive dual rail encoded light from a polarization rotator combiner, and to modify the dual rail encoded light.
A method comprising:
- converting polarization encoded light incoming via a fibre into an apparatus into dual rail form light;
- encoding, with a dual rail encoder, the dual rail form light with payload information and modifying, with the dual rail encoder, the dual rail form light to correct, based on adjustment information concerning the fibre, for polarization rotation caused by the fibre;
- converting the dual rail encoded light to polarization encoded light, and providing the polarization encoded light into the fibre.
A method, comprising:
- providing light from a light source to a fibre via a fibre interface;
- receiving light from the fibre interface and measuring at least one quantity of the received light,
- communicating adjustment information concerning polarization rotation caused by the fibre via an interface distinct from the fibre interface;
- and
- correcting for polarization rotation caused by the fibre based at least in part on the adjustment information, wherein the correcting for polarization rotation is performed in a dual rail encoder configured to receive dual rail form light from a polarization rotator combiner, and to modify the dual rail form light.
Dependencies are inferred from the claim text.