Patent ID: 6142680
Filing Date: 2000-11-07
Classification: G02B,H04B

Abstract:
An optical transmission/reception module, comprising:a light-emitting element to emit transmission light;a first lens holder to support a first lens which collimates the transmission light which has left the light-emitting element;a partial wave filter to pass therethrough the transmission light collimated by said first lens;a second lens holder to support a second lens which gathers the light, which has passed through said partial wave filter, at an end surface of an optical fiber;a third lens holder to support a third lens which gathers and concentrates reception light, collimated by said second lens, after the reception light has been emitted from the end surface of the optical fiber, and reflected by the partial wave filter;a light-receiving element to receive the light gathered by said third lens; anda housing block accommodating the light-emitting element, first lens holder and first lens, the partial wave filter, the second lens holder and second lens, the third lens holder and third lens, the light-receiving element;the housing block further comprising:a first passage to guide the transmission light collimated by the first lens to the partial wave filter;a second passage to guide the transmission light which has passed through the partial wave filter to the end surface of the optical fiber through the second lens, and to guide the reception light which has been emitted from the end surface of the optical fiber to the partial wave filter through the second lens;a third passage to guide the reception light reflected by the partial wave filter to the third lens;a mounting surface, disposed between the first and second passages, to mount the partial wave filter thereon, anda cutout formed from an outside surface of the housing block to the mounting surface and to a side thereof such that the partial wave filter is transportable from outside the housing block through the cutout and directly mountable on the mounting surface.