Dual sided expansion waveguide

An optical display comprising:

• a waveguide;
• an input coupler in the waveguide, the input coupler configured to couple image light from an image source into a beamsplitter;
• the beamsplitter configured to split the image light and direct the image light to a first expansion grating and a second expansion grating;
• the first expansion grating configured to receive the image light from the beamsplitter, expand the image light along a first axis and away from a first direction at a first angle of expansion, and direct the image light out of the first expansion grating in a second direction different than the first direction;
• the second expansion grating configured to receive the image light from the beamsplitter, to expand the image light along the first axis and towards the first direction at a second angle of expansion, and direct the image light out of the first expansion grating in the second direction;
• an output coupler configured to:
• receive the image light from the first expansion grating and the second expansion grating,
• expand the image light along a second axis parallel to the second direction, and
• cause the image light to exit the waveguide in an output direction.