Optical coupler
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsJunichiro Yamashita, Yoshio Miyake, Toshio Takei
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Abstract
In an optical coupling unit having an optical coupler adapted to couple a light beam from a light-emitting element to an optical fiber, the aberration of the lens is decreased to improve the efficiency of coupling of the light beam from the light-emitting element to the optical fiber. A silicon crystal having a high refractive index is used as a lens material to realize an optical system of low aberration.
Claims10
In an optical coupler unit having an optical coupler disposed between a light-emitting element and an optical fiber for coupling a light beam emitted by said light-emitting element to said optical fiber, the improvement wherein said optical coupler comprises a silicon crystal spherical lens, the surfaces of which are covered with an antireflective coating.
An optical coupler unit comprising:
- an optical coupler disposed between a light-emitting element and an optical fiber to couple a light beam emitted by said light-emitting element to said optical fiber;
- a mount which fixedly secures said optical coupler, said mount having a through hole at a center thereof, said through hole having a counter bore formed therein;
- and one of a silicon crystal semi-spherical lens and a silicon crystal plano-convex lens mounted in said counter bore in such a manner that a flat surface of said lens rests on a bottom of said counter bore and a periphery of said lens is hermetically secured to an inner wall of said counter bore.
Dependencies are inferred from the claim text.