Compact apparatus and method for integrated photonic devices having folded directional couplers

摘要: An integrated photonic apparatus that includes a glass substrate having major surface, first waveguide segment and second segment, folded evanescent coupler connecting the to second. The is formed by length of an equivalent portion running parallel adjacent segment. substantially equal one half evanescent-coupler needed transfer wavelength in non-folded coupler. A reflector (e.g., dielectric mirror highly reflective light also transmissive wavelength) located at end selected all wavelength.