Polarization conversion device and polarization multiplexing modulator
AssigneeFujitsu Limited
InventorsMasaharu Doi, Kazuhiro Tanaka
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Abstract
A polarization conversion device converts a polarization state of a light which is input to a first waveguide, that is, TE/TM mode of the light, to output it from the first waveguide. The polarization conversion device includes: a mode converter that performs the inter-conversion of TE/TM modes of the light which is input to the first waveguide; and a polarization separator that receives the light passed through the mode converter and separates the received light into a first light, TE/TM of which mode has been converted by the mode converter and a second light, TE/TM of which mode has not been converted, to output the first light to the first waveguide.
Claims14
A polarization conversion device which converts a polarization state of a light input to a first waveguide to output the converted light from the first waveguide, comprising:
- a mode converter which performs an inter-conversion of TE/TM modes of the light input to the first waveguide;
- and
- a polarization separator which receives the light passed through the mode converter, and separates the received light into a first light, TE/TM mode of which has been converted by the mode converter, and a second light, TE/TM mode of which has not been converted by the mode converter, to output the first light to the first waveguide.
A polarization multiplexing modulator comprising:
- a substrate having an electro-optic effect;
- a first optical modulator and a second optical modulator which are provided on the substrate and which modulate respective lights of same polarization state;
- a polarization converter which converts an polarization state of an output light from the second optical modulator;
- and
- a polarization combiner which polarization combines an output light from the first optical modulator and an output light from the polarization converter, to generate a polarization multiplexed light and output it,
- wherein the polarization converter includes:
- a mode converter which performs an inter-conversion of TE/TM modes of the output light from the second optical modulator;
- and
- a polarization separator which receives a light passed through the mode converter and separates the received light into a first light, TE/TM mode of which has been converted by the mode converter, and a second light, TE/TM mode of which has not been converted by the mode converter, to output the first light to the polarization combiner.
Dependencies are inferred from the claim text.