Patent ID: 9571219
Date: 2017-02-14
CPC Classifications: G02B,H04J,H04Q

Claim:
1. A wavelength division de-multiplexer comprising: a base substrate; an input collimator having a bottom side on said base substrate, wherein an input light beam is configured to be collimated by said input collimator to be emitted from said input collimator; a first mirror having a bottom side on said base substrate; a second mirror having a bottom side on said base substrate; a third mirror having a bottom side on said base substrate; a first optical splitter having a bottom side on said base substrate, wherein said first mirror is configured to reflect a first light beam, deriving from said input light beam, to said first optical splitter, wherein said first optical splitter is configured to split said first light beam into a second light beam passing through said first optical splitter to exit from a first light exit surface of said first optical splitter and a third light beam reflecting to said second mirror; and a second optical splitter having a bottom side on said base substrate, wherein said second mirror is configured to reflect said third light beam to said second optical splitter, wherein said second optical splitter is configured to split said third light beam into a fourth light beam passing through said second optical splitter to exit from a second light exit surface of said second optical splitter and a fifth light beam reflecting to said third mirror, wherein said first light beam reflected from said first mirror to said first optical splitter is exactly parallel to said third light beam reflected from said second mirror to said second optical splitter, wherein said second light beam exiting from said first light exit surface is exactly parallel to said fourth light beam exiting from said second light exit surface and exactly parallel to said input light beam emitted from said input collimator and propagates in exactly the same direction as said fourth light beam propagates.