Optical reception module and method of manufacturing optical reception module

摘要

At the time of assembly of an optical transmission/reception module, a test variable wavelength light source 22 for outputting a test light signal is connected to a connector 8 of an optical fiber 7, and a large-diameter PD 23 measures a transmission loss in a light wavelength band limiting filter 12 while a rotational position determining unit 24 rotates a fiber ferrule 5, so that the rotational position determining unit 24 determines the rotational position θloss-min of the fiber ferrule 5 which minimizes the transmission loss in the light wavelength band limiting filter 12, and aligns the fiber ferrule 5 at the rotational position θloss-min.

主权项

1. An optical reception module comprising:
a fiber ferrule which rotates about a central axis of the fiber ferrule that coincides with a fiber core axis, wherein the fiber ferrule includes an end surface that is cut slantwise and has a rotational position that can be determined; a photoelectric conversion optical reception module to receive a light signal and convert the light signal into an electric signal; a wavelength division multiplexing filter to reflect a light signal emitted from the end surface of said fiber ferrule toward said photoelectric conversion optical reception module; and a light wavelength band limiting filter arranged between said wavelength division multiplexing filter and said photoelectric conversion optical reception module to cause the light signal reflected by the wavelength division multiplexing filter to enter the light wavelength band limiting filter, said light wavelength band limiting filter having a filter characteristic varying according to an angle of incidence of the light signal entered thereto; wherein the rotational position of said fiber ferrule is determined in such a way that the rotational position provides the light signal with the angle of incidence which causes said light wavelength band limiting filter to exhibit a desired characteristic.