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Optical transmission and receiving module
| Details |
Inventors: Ishihara, Takehisa; Miyuki, Hideki; Nagura, Kazuhito; Terashioma, Kentaro; Nakatsu, Hiroshi;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Mack; Ricky
Assistant Examiner:
Attorney, Agent or Firm: Dike, Bronstein, Roberts & Cushman, LLP, Conlin; David G., Hartnell, III; George W.
An optical transmission and receiving module includes a light source; a light receiving element; and a light branching element for causing signal light from the light source to be incident on an optical fiber and causing signal light output from the optical fiber to be incident on the light receiving element. The light branching element includes a prism array including a plurality of triangular prisms arranged at substantially an identical pitch on a plane extending substantially perpendicular to an imaginary line connecting the light source and the light receiving element. |
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DETAILED DESCRIPTION According to one aspect of the invention, an optical transmission and receiving module includes a light source; a light receiving element; and a light branching element for causing signal light from the light source to be incident on an optical fiber and causing signal light output from the optical fiber to be incident on the light receiving element.
The light branching element includes a prism array including a plurality of triangular prisms arranged at substantially an identical pitch on a plane extending substantially perpendicular to an imaginary line connecting the light source and the light receiving element.
In one embodiment of the invention, the optical transmission and receiving module fulfills d/2>P>>.
lambda.
/sin.
theta.
where d is a diameter of the optical fiber, .
lambda.
is a wavelength of light from the light source, P is a pitch of the plurality of triangular prisms, and .
theta.
is a deflection angle of the plurality of triangular prisms.
In one embodiment of the invention, each of the plurality of triangular prisms has an isosceles triangular cross-section.
In one embodiment of the invention, each of the plurality of triangular prisms has a vertex angle in the range of about -20.
degree.
to 60.
degree.
.
In one embodiment of the invention, the optical transmission and receiving module fulfills: 1/tan(1/.
alpha.
tx)=1/tan(1/.
alpha.
rx)+tan(.
alpha.
rx-arcsin(.
alpha.
rx/n)) where .
alpha.
tx is one vertex angle, .
alpha.
rx is another vertex angle, and n is the refractive index of each of the plurality of triangular prisms.
In one embodiment of the invention, the optical transmission and receiving module fulfills .
PHI.
>B where .
PHI.
is the diameter of the signal light output from the optical fiber to the prism array, and B is the length of a base of each of the plurality of triangular prisms.
In one embodiment of the invention, the prism array is formed of acrylic.
In one embodiment of the invention, the light source includes a light emitting element which is formed a semiconductor laser element
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Optical Systems 
