Multi-branch digital optical switch

Details Multi-branch digital optical switch Multi-branch digital optical switch

G - Physics

02

F

G02F 1/313 (2006.01) G02F 1/19 (2006.01)

Patent

CA 2136752

A multi-branch digital optical switch (10) having three branch waveguides through which light may exit. The multi-branch digital optical switch includes a main waveguide (12), two side branch waveguides (16,18), and one center branch waveguide (14). The two side branch waveguides diverge symmetrically from the center branch waveguide at angles which are sufficiently small to allow modal evolution through the switch to be substantially adiabatic. Electric fields are used to raise the index of refraction of one side branch waveguide above the index of the center branch waveguide and to tower the index of refraction of the other side branch below the index of the center branch waveguide. The switch has an extinction ratio of 700:1 (28 dB) between its two side branches.

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