Optical switch and manufacturing method thereof
First Claim
1. An optical switch of a Mach-Zehnder interferometer type composed of a line defect waveguide of a photonic crystal, the optical switch comprising two directional couplers and two paths of waveguides therebetween,wherein the directional couplers have at least two input ends and two output ends,a part equivalent to a core of the line defect waveguide is composed by arranging defect pillars in a line,a part equivalent to a clad of the line defect waveguide is a lattice of non-defect pillars on both sides of the defect pillars,and between the two paths, a first path of the waveguide and a second path of the waveguide have different group velocity of guided light.
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Accused Products
Abstract
The object is to provide an optical switch capable of efficient operation and a manufacturing method thereof. The optical switch according to the present invention is a Mach-Zehnder interferometer type optical switch composed of a line defect waveguide of a photonic crystal. Further, the optical switch according to the present invention includes two directional couplers 20 and 23, and two paths of waveguides 30 and 32 therebetween. Furthermore, between the two paths, group velocity of guided light differs in the first path waveguide 20 and the second path waveguide 32.
8 Citations
26 Claims
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1. An optical switch of a Mach-Zehnder interferometer type composed of a line defect waveguide of a photonic crystal, the optical switch comprising two directional couplers and two paths of waveguides therebetween,
wherein the directional couplers have at least two input ends and two output ends, a part equivalent to a core of the line defect waveguide is composed by arranging defect pillars in a line, a part equivalent to a clad of the line defect waveguide is a lattice of non-defect pillars on both sides of the defect pillars, and between the two paths, a first path of the waveguide and a second path of the waveguide have different group velocity of guided light.
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6. An optical switch of a Mach-Zehnder interferometer type composed of a line defect waveguide of a pillar type photonic crystal, the optical switch comprising two directional couplers and two paths of waveguides therebetween,
wherein the directional couplers have at least two input ends and two output ends, a part equivalent to a core of the line defect waveguide is composed by arranging defect pillars in a line, a part equivalent to a clad of the line defect waveguide is a lattice of non-defect pillars on both sides of the defect pillars, and between the two paths, a cross-section area of the defect pillar of at least one path of the waveguide is smaller than a cross-section area of a defect pillar forming a line defect of the waveguide composing the directional coupler.
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12. An optical switch of a Mach-Zehnder interferometer type composed of a line defect waveguide of a photonic crystal, the optical switch comprising two directional couplers and two paths of waveguides therebetween,
wherein the directional couplers have at least two input ends and two output ends, a part equivalent to a core of the line defect waveguide is composed by arranging defect pillars in a line, a part equivalent to a clad of the line defect waveguide is a lattice of non-defect pillars on both sides of the defect pillars, and a part or all of at least one of the two paths of the waveguides operates as a resonator that resonates to light of a frequency other than a waveguide band of the waveguide composing the directional coupler.
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16. A manufacturing method of an optical switch of a Mach-Zehnder interferometer type composed of a line defect waveguide of a photonic crystal, the manufacturing method comprising forming two directional couplers and two paths of waveguides therebetween,
wherein the directional couplers have at least two input ends and two output ends, a part equivalent to a core of the line defect waveguide is composed by arranging defect pillars in a line, a part equivalent to a clad of the line defect waveguide is a lattice of non-defect pillars on both sides of the defect pillars, and between the two paths, a first path of the waveguide and a second path of the waveguide have different group velocity of guided light.
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19. An optical switch of a Mach-Zehnder interferometer (MZI) type comprising:
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a waveguide core of a first MZI path comprising a plurality of first photonic crystal pillars arranged to form (i) a first photonic band that is transmissive for light of an operating frequency, and (ii) a first group velocity dispersion for light of the operating frequency; a waveguide core of a second MZI path comprising a plurality of second photonic crystal pillars arranged to form (i) a second photonic band that is transmissive for light of the operating frequency, and (ii) a second, different, group velocity dispersion for light of the operating frequency; and a clad region comprising a plurality of third photonic crystal pillars arranged on both sides of the waveguide core of the first MZI path and the waveguide core of the second MZI path to form a photonic band gap that is not transmissive for light of the operating frequency. - View Dependent Claims (20, 21, 22)
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23. An optical switch of a Mach-Zehnder interferometer type comprising:
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a waveguide core of a first MZI path comprising a plurality of first photonic crystal pillars arranged to form a first photonic band that is transmissive for light of (i) an operating frequency and (ii) a control frequency; a waveguide core of a second MZI path comprising a plurality of second photonic crystal pillars arranged to form a second photonic band that is transmissive for light of the operating frequency; a waveguide core of a first connection waveguide coupled to an input of the first MZI path, the waveguide core of the first connection waveguide comprises a plurality of third photonic crystal pillars arranged to form (i) a third photonic band that is transmissive for light of the operating frequency and (ii) a first photonic band gap that is reflective for light of the control frequency; a waveguide core of a second connection waveguide coupled to an output of the first MZI path, the waveguide core of the second connection waveguide comprises a plurality of fourth photonic crystal pillars arranged to form (i) a fourth photonic band that is transmissive for light of the operating frequency and (ii) a second photonic band gap that is reflective for light of the control frequency; and a clad region comprising a plurality of fifth photonic crystal pillars arranged on both sides of the waveguide core of the first MZI path and the waveguide core of the second MZI path to form a third photonic band gap that is not transmissive for light of the operating frequency, wherein the first connection waveguide, the first MZI path, and the second connection waveguide form a resonator for light of the control frequency. - View Dependent Claims (24, 25, 26)
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Specification