Strasser T A, Hsu W Y, Gupta M C
Appl Opt. 1993 Oct 20;32(30):6006-17. doi: 10.1364/AO.32.006006.
A tapered waveguide film was deposited on a substrate with a grating structure resulting in a hybridthin-film waveguide coupler that could be designed for a broader or narrower acceptance for wavelength or incidence angle. The optimized couplers were designed and fabricated. The couplers were found to be as efficient as traditional grating couplers but with much broader acceptance. The maximum broadening was calculated to be a coupling FWHM of 2° (or 12 nm) and was confirmed experimentally. This is 4.3 times the acceptance of an identical untapered structure.
在具有光栅结构的衬底上沉积了渐变波导薄膜，从而形成了一种混合薄膜波导耦合器，该耦合器可设计用于对波长或入射角具有更宽或更窄的接收范围。设计并制造了优化后的耦合器。发现这些耦合器与传统光栅耦合器一样高效，但接收范围要宽得多。计算得出最大展宽为2°（或12纳米）的耦合半高宽，并通过实验得到了证实。这是相同的非渐变结构接收范围的4.3倍。
