| 摘要 |
A grating for an optical device. The grating includes a working area comprising a periodic grating structure and a non-working area comprising a support structure for mating with an additional component of the optical device. The support structure supports the additional component in order to prevent strains from developing in the grating. The strains may come from physical stresses applied to the optical device during manufacturing or use or may come from changes in the temperature of the optical device. The support structure may operate by providing an element whose width to height ratio is greater than a width to height ratio of the elements in the grating structure. The support structure may also operate by being higher than the working area of the grating. Furthermore, the non-working area of the grating may include alignment marks used during the manufacturing of the optical device.
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