Patent ID: 8655181
Filing Date: 2014-02-18
Classification: G02B

Abstract:
1. An optical transmission/reception module comprising: an optical transmission module for transmitting a light signal having a first wavelength band; a first optical reception module for receiving a light signal having a second wavelength band; a second optical reception module for receiving a light signal having a third wavelength band; a fiber ferrule connected to an optical fiber; a first wavelength division multiplexing filter for allowing the light signal having the first wavelength band transmitted from said optical transmission module to pass therethrough toward an end surface of said fiber ferrule and also allowing a light signal having the second wavelength band emitted from the end surface of said fiber ferrule to pass therethrough while reflecting a light signal having the third wavelength band emitted from the end surface of said fiber ferrule toward said second optical reception module; a second wavelength division multiplexing filter arranged between said first wavelength division multiplexing filter and said optical transmission module, for allowing the light signal having the first wavelength band transmitted from said optical transmission module to pass therethrough toward said first wavelength division multiplexing filter while reflecting the light signal having the second wavelength band passing through said first wavelength division multiplexing filter toward said first optical reception module; and a light wavelength band limiting filter arranged between said first wavelength division multiplexing filter and said second optical reception module; a housing for mounting said optical transmission module, said first and second optical reception modules, said fiber ferrule, said first and second wavelength division multiplexing filters, and said light wavelength band limiting filter, the housing defining a cylindrical hole; and; a filter holder mounted in said housing, wherein said filter holder has a first mount surface to which said first wavelength division multiplexing filter is mounted, a second mount surface to which said second wavelength division multiplexing filter is mounted, and a third mount surface to which said light wavelength band limiting filter is mounted, said first and second mount surfaces intersecting each other at a predetermined angle in such a way that said first and second mount surfaces have a substantially V shape in cross section, said third mount surface being formed on a rear side of said filter holder opposite to a side on which said first mount surface forms a narrow angle with said second mount surface, and wherein said housing and said filter holder each exhibit a tapered portion tapered in the direction of the axis of the cylindrical hole, said tapered portions being positioned and shaped to engage one another in a press fitting relation when said filter holder is mounted in said cylindrical hole of said housing.