Patent ID: 6069987
Filing Date: 2000-05-30
Classification: G02B

Abstract:
For use in optical network units in optical communication, an optical device having a first input terminal for receiving a multiplexed light having component beams of mutually different wavelengths included therein; a first output terminal for outputting a beam of a first wavelength component separated from said multiplexed light received at said input terminal; and a pair of second input and output terminals for enabling bi-direction communication to direct to said first input terminal a beam of a second wavelength component separated from said multiplexed light, said optical device comprising:a first computer generated hologram for converting said multiplexed light from said first input terminal into a parallel beam;deflection means for deflecting said multiplexed light having passed through said first computer generated hologram according to wavelengths thereof;a second computer generated hologram for directing to the first output terminal a beam of the first wavelength component separated by said deflection means;optical path splitting means for separating said second wavelength component separated by said deflection means;a third computer generated hologram for directing a beam of the second wavelength component traveling through one optical path separated by said optical path splitting means to said second output terminal; anda fourth computer generated hologram for guiding a beam of the second wavelength component from said second input terminal to said optical path splitting means in order to direct the beam of the second wavelength component from the second input terminal to said first input terminal through the other optical path, the optical path splitting means and the first computer generated hologram.