Patent ID: 9614636
Date: 2017-04-04
CPC Classifications: G02B,H04B,H04J

Claim:
1. A receiver optical module for receiving a wavelength multiplexed signal containing a plurality of signal components each having a wavelength specific thereto and different from the others, comprising: an optical de-multiplexer that de-multiplexes the wavelength multiplexed signal, the optical de-multiplexer including sub-elements stacked to each other, the sub-elements each having an input surface, a body, and an output surface, the input surface providing a wavelength selective filter (WSF) belonging to a first group and the body providing a plurality of WSFs belonging to a second group; and photodiodes (PDs) that receive signal components independently, wherein the signal components contained in the wavelength multiplexed signal are spilt by the first group of the WSFs to respective bodies, wherein respective signal components split by the first group of the WSFs are de-multiplexed by the second group of the WSFs, and wherein the output surfaces have respective mirrors that reflect the signal components de-multiplexed by the second group of WSFs toward a stacking direction of the sub-elements.