Patent ID: 9644966
Date: 2017-05-09
CPC Classifications: G01C,G02B,G02F

Claim:
1. An integrated optical circuit for an interferometer, the integrated optical circuit comprising: a first waveguide section of a first material having a first index of refraction, the first material configured to polarize light traveling in the first waveguide section; a second waveguide section diffused with a second material, different from the first material, that is coupled to the first waveguide section at a first interface, the second waveguide section having a second index of refraction; and a third waveguide section of the first material that is coupled to the second waveguide section at a second interface; wherein a portion of the first waveguide section at the first interface is angled at a first angle and a portion of the second waveguide section at the first interface is angled at the first angle; wherein a portion of the second waveguide section at the second interface is angled at a second angle and a portion of the third waveguide section at the second interface is angled at the second angle; wherein the first angle is selected such that the angle of incidence of light exiting the first waveguide section is greater than the Brewster's angle at the first interface; and wherein the second angle is selected such that the angle of incidence of light exiting the second waveguide section is greater than the Brewster's angle at the second interface; wherein the second waveguide section includes a junction from which first and second branch sections of the second waveguide section are formed, the third waveguide section coupled to the first branch section at the second interface, the integrated optical circuit further comprising: a fourth waveguide section of the first material coupled to the second branch section at a third interface; wherein a portion of the second branch section at the third interface and a portion of the fourth waveguide section at the third interface are angled at a third angle; wherein the third angle is selected such that the angle of incidence of light exiting the second branch section is greater than the Brewster's angle at the third interface; wherein the second angle and the third angle are supplementary angles.