Optical device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHidenobu Hamada
Life of this patent
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Abstract
An optical device includes, in a predetermined section of an optical fiber 1, a first functional part 7 having a plurality of Faraday crystal columns 5 that are parallel to each other and almost penetrating perpendicularly to an optical axis 2 of an optical fiber 1 through a core thereof, and a second functional part 8 having a plurality of holes 6 that are parallel to each other and almost penetrating perpendicularly to the optical axis 2 of the optical fiber 1 through the core thereof. A longitudinal direction of the Faraday crystal columns 5 and a longitudinal direction of the holes 6 form an angle of 45 degrees along a plane perpendicular to the optical axis 2. Thus, the optical device can be realized only by processing the optical fiber.
Claims53
A method of fabricating a photonic crystal, comprising the step of forming the photonic crystal directly on an end surface of at least one optical fiber as a substrate.
A method of fabricating a photonic crystal, comprising the step of forming the photonic crystal by making, in a predetermined section along an optical axis of an optical fiber composed of a core through which light propagate and a clad surrounding the core, a plurality of columns penetrate through said core.
An optical transmission member for transmitting light having a predetermined wavelength, comprising:
- an optical fiber for transmitting the light inputted at one end surface thereof to another end surface thereof for output;
- and
- a photonic crystal layer formed on at least either one of the end surfaces of said optical fiber and functioning as a linear polarizer for the light having said wavelength.
An optical transmission member for transmitting light having a predetermined wavelength, comprising:
- an optical fiber for transmitting the light inputted at one end surface thereof to another end surface thereof for output;
- and
- a photonic crystal layer formed on at least either one of the end surfaces of said optical fiber and functioning as a λ/4 plate for the light having said wavelength.
An optical transmission member for transmitting light having a predetermined wavelength, comprising:
- an optical fiber for transmitting the light inputted at one end surface thereof to another end surface thereof for output;
- and
- a photonic crystal layer formed on at least either one of the end surfaces of said optical fiber and functioning as a photonic-crystal circular polarizer for the light having said wavelength.
An optical device structured by forming a photonic crystal on an optical fiber composed of a core through which light propagate and a clad surrounding the core, comprising:
- at least one functional part formed as said photonic crystal with a plurality of columns penetrating through said core in a predetermined section of said optical fiber along an optical axis of said optical fiber;
- and
- a propagation part for propagating the light as a function of said optical fiber.
An optical device, comprising:
- first and second optical fibers formed by a plurality of holes parallel to each other penetrating through the core in a predetermined section along an optical axis and periodically distributed on a plane perpendicular to a longitudinal direction of the holes;
- a Faraday device placed to be closely attached between said first and second optical fibers;
- and
- a guide for mechanically adjusting an optical axis of said first optical fiber and an optical axis of said second optical fiber, wherein
- a longitudinal direction of said holes of said first optical fiber forms an angle of 45 with a longitudinal direction of said holes of said second optical fiber along a plane perpendicular to said optical axis.
An optical sensor including a light-emitting-part for emitting a light beam;
- a sensor part including circular polarizer means for converting unpolarized light into circularly polarized light, an electro-optic crystal film, and an analyzer sequentially arranged on a predetermined optical axis set along an optical path of said light beam;
- and a light-receiving part for receiving said light beam after passing through said sensor part, said optical sensor for measuring, based on said light beam received by said light-receiving part, a voltage applied to said electro-optic crystal film, wherein
- said light-emitting part includes a first optical fiber for inducing said light beam into said sensor part,
- said light-receiving part includes a second optical fiber for inducing, from said sensor part, said light beam after passing therethrough,
- said circular polarizer means includes
- a polarizer for converting the unpolarized light into linearly polarized light;
- and
- a λ/4 plate for converting the linearly polarized light into the circularly polarized light,
- said polarizer is formed on an end surface of said first optical fiber as a photonic crystal layer for converting said light beam from said light-emitting part into a linearly polarized beam, and
- said analyzer is formed on an end surface of said second optical fiber as a photonic crystal layer for converting said light beam after passing through said sensor part into a linearly polarized beam.
An optical sensor including a light-emitting part for emitting a light beam;
- a sensor part including circular polarizer means for converting unpolarized light into circularly polarized light, an electro-optic crystal film, and an analyzer sequentially arranged on a predetermined optical axis set along an optical path of said light beam;
- and a light-receiving part for receiving said light beam after passing through said sensor part, said optical sensor for measuring, based on said light beam received by said light-receiving part, a voltage applied to said electro-optic crystal film, wherein
- said light-emitting part includes a first optical fiber for inducing said light beam into said sensor part,
- said light-receiving part includes a second optical fiber for inducing, from said sensor part, said light beam after passing therethrough,
- said circular polarizer means is formed on an end surface of said first optical fiber as a photonic crystal layer for converting said light beam from said light-emitting part into a circularly polarized beam, and
- said analyzer is formed on an end surface of said second optical fiber as a photonic crystal layer for converting said light beam after passing through said sensor part into a linearly polarized beam.
An optical sensor including a light-emitting part for emitting a light beam;
- a sensor part including a polarizer, a magneto-optic crystal film, and an analyzer sequentially arranged on a predetermined optical axis set along an optical path of said light beam;
- and a light-receiving part for receiving said light beam after passing through said sensor part, said optical sensor for measuring, based on said light beam received by said light-receiving part, a voltage applied to said magneto-optic crystal film, wherein
- said light-emitting part includes a first optical fiber for inducing said light beam into said sensor part,
- said light-receiving part includes a second optical fiber for inducing said light beam for said sensor part,
- said polarizer is formed on an end surface of said first optical fiber as a photonic crystal layer for converting said light beams from said light-emitting part into a linearly polarized light beam, and
- said analyzer is formed on an end surface of said second optical fiber as a photonic crystal layer for converting into said light beams after passing through said sensor part into a linearly polarized beam.
An optical sensor including a light-emitting part for emitting a light beam;
- a sensor part including a polarizer, a λ/4 plate, an electro-optic crystal, and an analyzer sequentially arranged on a predetermined optical axis set along an optical path of said light beam;
- and a light-receiving part for receiving said light beam after passing through said sensor part, said optical sensor for measuring, based on said light beam received by said light-receiving part, a voltage applied to said electro-optic crystal, said optical sensor further comprising:
- a first reflective film having a reflection plane perpendicular to said optical axis and placed between said λ/4 plate and said electro-optic crystal;
- and
- a second reflective film having a reflection plane perpendicular to said optical axis and placed between said electro-optic crystal and said analyzer, wherein
- an interval between said first reflective film and said second reflective film is an integer multiple of half a wavelength of said light beam.
Dependencies are inferred from the claim text.