Optical wave-guide, light-beam spot converter and optical transmission module
AssigneeHitachi, Ltd.
InventorsKazumi Kawamoto, Hiroaki Furuichi
Life of this patent
Estimating the term…
Abstract
Utilizing propagation of light along with a region of high refractive index, an enlargement and a reduction of an optical beam-spot are achieved by a plurality of layers of the cruds, in which relationships in magnitude of the refractive index are defined with respect to a segment-like core.
Claims16
An optical wave-guide having a z axis as an optical axis in a direction of propagation of light, an x axis in a vertical direction on a cross-section being perpendicular thereto, and a y axis in a horizontal direction, comprising:
- a core portion being formed so that a light is transmitted in the direction of the z axis, around at a center of an origin of said x axis and said y axis;
- and
- a crud layer surrounding said core portion and being lower in refractive index than that of said core portion, and being constructed with at least two layers, being different in refractive indexes thereof, which are in contact with each other on a border laying on a x coordinate in a positive or a negative region thereof but not the origin, wherein
- said core portion is formed discontinuously in the direction of said optical axis.
An optical wave-guide having a z axis as an optical axis in a direction of propagation of light, an x axis in a vertical direction on a cross-section being perpendicular thereto, and a y axis in a horizontal direction, comprising:
- a core portion being formed so that a light is transmitted in the direction of the z axis, around at a center of an origin of said x axis and said y axis;
- and
- a crud layer surrounding said core portion and being lower in refractive index than that of said core portion, and being constructed with at least two layers, being different in refractive indexes thereof, which are in contact with each other on a border laying on a x coordinate in a positive or a negative region thereof but not the origin, wherein
- said core portion is formed discontinuously in the direction of said optical axis, with varying a width of the core and a length of the core in the direction of the optical axis, and also a length of a portion of the core which is removed, non-cyclically.
An optical beam-spot converter, including an optical wave-guide having a z axis as an optical axis in a direction of propagation of light, an x axis in a vertical direction on a cross-section being perpendicular thereto, and a y axis in a horizontal direction, comprising:
- a core portion being formed so that a light is transmitted in the direction of the z axis, around at a center of an origin of said x axis and said y axis;
- and
- a crud layer surrounding said core portion and being lower in refractive index than that of said core portion, and being constructed with at least two layers, being different in refractive indexes thereof, which are in contact with each other on a border laying on a x coordinate in a positive or a negative region thereof but not the origin, wherein
- said core portion is formed discontinuously in the direction of said optical axis, whereby varying an optical beam-spot.
An optical beam-spot converter, including an optical wave-guide having a z axis as an optical axis in a direction of propagation of light, an x axis in a vertical direction on a cross-section being perpendicular thereto, and a y axis in a horizontal direction, comprising:
- a core portion being formed so that a light is transmitted in the direction of the z axis, around at a center of an origin of said x axis and said y axis;
- and
- a crud layer surrounding said core portion and being lower in refractive index than that of said core portion, and being constructed with at least two layers, being different in refractive indexes thereof, which are in contact with each other on a border laying on a x coordinate in a positive or a negative region thereof but not the origin, wherein
- said core portion is formed discontinuously in the direction of said optical axis, with varying a width of the core and a length of the core in the direction of the optical axis, and also a length of a portion of the core which is removed, non-cyclically, whereby varying an optical beam-spot.
Dependencies are inferred from the claim text.