Patent ID: 8885992

Claim:
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.