17 January 2005 Design of a flat-field arrayed waveguide grating
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A curved image plane is usually used in a conventional Rowland-type AWG. For some applications (e.g., sensing), a straight image plane is desirable so that the output field at the image plane can be received directly with a detector-array. If one simply chooses a flat output plane (instead of a circular output curve) without optimization for a conventional AWG of Rowland circle type, some considerable aberrations will be introduced, which degrade the performances of the AWG. The aberrations are calculated and analyzed with an optical path function. A three-stigmatic-point method is used to optimize the design of an AWG with a straight image plane and minimize the aberrations. In this design, the aberrations at three special wavelengths are removed. The first order aberrations at all wavelengths are also eliminated. An 80-channel flat-field AWG is designed as an example. The results show that the aberrations are reduced greatly and a good spectral response with tolerated side-lodes is obtained.
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Yaocheng Shi, Yaocheng Shi, Daoxin Dai, Daoxin Dai, Qincun Zhou, Qincun Zhou, Sailing He, Sailing He, "Design of a flat-field arrayed waveguide grating", Proc. SPIE 5644, Optoelectronic Devices and Integration, (17 January 2005); doi: 10.1117/12.566869; https://doi.org/10.1117/12.566869

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