Patent ID: 9411104
Filing Date: 2016-08-09
CPC Classification: G02B

Claim Text:
1. An apparatus, comprising: a first waveguide, a second waveguide, a third waveguide, a fourth waveguide, and a firth waveguide; a symmetric coupler configured to split power of an optical signal transmitted therethrough in a split power ratio within 1 db of 50:50, the symmetric coupler having a proximal end and a distal end, the proximal end of the symmetric coupler coupled to and in optical communication with the first waveguide and the second waveguide, the distal end of the symmetric coupler coupled to and in optical communication with the fourth waveguide; and, an asymmetric coupler configured to split power of an optical signal transmitted therethrough in a split power ratio other than 50:50, the asymmetric coupler having a proximal end and a distal end, the asymmetric coupler in cascaded configuration with the symmetric coupler, the cascaded configuration having the proximal end of the asymmetric coupler coupled to and in optical communication with the fourth waveguide and the third waveguide, the distal end of the asymmetric coupler coupled to and in optical communication with the fifth waveguide.