Optical receiver module and manufacturing method with a shifted and angled light receiving element
View Patent ↗Provided is an optical receiver module capable of suppressing an increase, which is caused by tolerance of angle occurring at a time of manufacturing, in an amount of reflected return light that enters into an optical fiber while ensuring light-receiving efficiency. The light-receiving element ( 10 ) is arranged so that directions of the lines, which extend along the edges contained in a surface of the light-receiving element ( 10 ) on a side of the light-receiving-element support member ( 11 ), and which intersect with the region surrounded by a straight line corresponding to the incident direction of the light, a straight line corresponding to a direction of the optical axis of the optical fiber ( 3 ), and a supporting surface of the light-receiving-element support member ( 11 ) for supporting the light-receiving element ( 10 ), correspond to the directions different from the directions orthogonal to the incident direction of the light.
1. An optical receiver module for receiving light which is entered through an optical fiber connected thereto, comprising:
a light-receiving element; and
a support member for supporting the light-receiving element, wherein:
the light-receiving element is arranged at a position shifted from a position on an optical axis of the optical fiber; and
the light-receiving element is arranged such that:
a shift perpendicular plane, which is a plane including an intersecting point between the optical axis of the optical fiber and a surface of the support member on a side facing the light-receiving element, is perpendicular to said surface,
the shift perpendicular plane is perpendicular to a line intersecting with the optical axis of the optical fiber, said line being from a light-beam intersecting point, which is an intersecting point between the entered light and a light-receiving surface of the light-receiving element, and
the shift perpendicular plane is not parallel to a direction of a nearest edge of the light-receiving element, the nearest edge being contained in the surface of the support member on the side facing the light-receiving-element and being nearest, among all edges of the light-receiving element, to the intersecting point between the optical axis of the optical fiber and the surface of the support member on the side facing the light-receiving element.
2. The optical receiver module according to claim 1 , wherein the light-receiving element is arranged so that directions of all edges contained in a surface of the light-receiving element on a side of the support member are not parallel to the shift perpendicular plane.
3. The optical receiver module according to claim 1 , wherein the light-receiving surface of the light-receiving element is inclined with respect to the supporting surface of the support member toward the optical axis of the optical fiber.
4. The optical receiver module according to claim 1 , wherein the direction of the nearest edge is defined on the basis of:
light-receiving efficiency;
inclination of the light-receiving surface of the light-receiving element with respect to the supporting surface of the support member; and
inclination of an incident direction of the light with respect to the direction of the optical axis of the optical fiber.
5. A manufacturing method for an optical receiver module, which receives light entered through an optical fiber connected thereto and comprises a light-receiving element and a support member for supporting the light-receiving element, the manufacturing method comprising:
arranging the light-receiving element at a position shifted from a position on an optical axis of the optical fiber; and
arranging the light-receiving element such that:
a shift perpendicular plane, which is a plane including an intersecting point between the optical axis of the optical fiber and a surface of the support member on a side facing the light-receiving element, is perpendicular to said surface,
the shift perpendicular plane is perpendicular a line intersecting with the optical axis of the optical fiber, said line being from a light-beam intersecting point, which is an intersecting point between the entered light and a light-receiving surface of the light-receiving element, and
the shift perpendicular plane is not parallel to a direction of a nearest edge of the light-receiving element, the nearest edge being contained in the surface of the support member on the side facing the light-receiving-element and being nearest, among all edges of the light-receiving element, to the intersecting point between the optical axis of the optical fiber and the surface of the support member on the side facing the light-receiving element.