Optical filtering device and method of tuning the same
AssigneeSamsung Electronics Co., Ltd.
InventorsAleksandr Sergeevich SHOROKHOV, Anton Sergeevich Medvedev, Maxim Vladimirovich Ryabko
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Abstract
Provided is an optical filtering device including a microring resonator including one or more partial regions covered with a phase change material (PCM) section, a first waveguide including a first interferometric arm including a region covered with a PCM, wherein radiation is input to and output through the first waveguide, and a second waveguide including a second interferometric arm including a region covered with a PCM, wherein radiation is input to and output through the second waveguide.
Claims20
An optical filtering device comprising:
- a microring resonator comprising a first region, a phase change material (PCM) being on the first region;
- a first waveguide comprising a first interferometric arm and configured to receive and output radiation, the first interferometric arm comprising a second region, a PCM being on the second region;
- and
- a second waveguide comprising a second interferometric arm and configured to receive and output radiation, the first interferometric arm comprising a third region, a PCM being on the third region,
- wherein the microring resonator is between the first waveguide and the second waveguide, and a region of the first interferometric arm and a region the second interferometric arm are adjacent to the microring resonator and configured to provide optical coupling with the microring resonator,
- wherein a phase of radiation of a predetermined wavelength that passes through each of the first interferometric arm and the second interferometric arm is a multiple of 2πn, where n is an integer, of a phase of radiation that passes through a region of the microring resonator between the region of the first interferometric arm and the region of the second interferometric arm configured to provide optical coupling with the microring resonator, and
- wherein each of the PCM respectively on the microring resonator, the first interferometric arm, and the second interferometric arm are configured to provide a predetermined effective refractive index at the predetermined wavelength and provide at least one of a resonance shift and an amplitude change of radiation at the predetermined wavelength propagating in the first waveguide or the second waveguide.
A method of tuning an optical filtering device comprising a first waveguide comprising a first interferometric arm, a second waveguide that comprises a second interferometric arm, a microring resonator between the first waveguide and the second waveguide, and phase change material (PCM) on the first waveguide, the second waveguide, and the microring resonator, the method comprising:
- tuning each PCM respectively on the microring resonator, the first interferometric arm, and the second interferometric arm,
- wherein the tuning of each of the PCM sections comprises:
- performing thermal injection on each of the PCM to provide a predetermined partial crystallization of at least a portion of the PCM to change a phase state of at least a portion of the PCM, such that a predetermined change is caused in the effective refractive index in the PCM at a predetermined wavelength;
- and
- determining the phase state of at least a portion of the PCM by a coefficient α indicating a proportion of a crystalline phase and an amorphous phase in at least a portion of the PCM, the coefficient α being determined by:
- α
- =
- v
- a
- (
- v
- a
- +
- v
- c
- )
- ,
- where va is a volume of the amorphous phase, and vc is a volume of the crystalline phase,
- wherein each of the PCM sections respectively on the microring resonator, the first interferometric arm, and the second interferometric arm is tuned to provide a predetermined effective refractive index for radiation at the predetermined wavelength to provide any one of a resonance shift and an amplitude change of radiation at the predetermined wavelength propagating in the first waveguide or the second waveguide.
Dependencies are inferred from the claim text.