Abstract

A three-focal-point method is used for the design of a flat-top planar waveguide concave grating. With the Gaussian approximation a modified formula is proposed and is compared with the numerical model of the scalar diffraction theory by using a design example. The sources of loss caused by the flat-top design and the grating are taken into consideration. The optimal separation between the two outmost focal points is obtained and the spectral response of the demultiplexer with a ripple below 0.04 dB is achieved.

© 2009 IEEE

400-Channel 25-GHz-spacing SOI-based planar waveguide demultiplexer employing a concave grating across C- and L-bands

Chun-Ting Lin
Opt. Express 18(6) 6108-6115 (2010)

Ultra-compact, flat-top demultiplexer using anti-reflection contra-directional couplers for CWDM networks on silicon

Wei Shi, Han Yun, Charlie Lin, Mark Greenberg, Xu Wang, Yun Wang, Sahba Talebi Fard, Jonas Flueckiger, Nicolas A. F. Jaeger, and Lukas Chrostowski
Opt. Express 21(6) 6733-6738 (2013)

Analysis and design of a concave diffraction grating with total-internal-reflection facets by a hybrid diffraction method

Zhimin Shi, Jian-Jun He, and Sailing He
J. Opt. Soc. Am. A 21(7) 1198-1206 (2004)

Planar Rowland spectrometer for fiber-optic wavelength demultiplexing

H. W. Yen, H. R. Friedrich, R. J. Morrison, and G. L. Tangonan
Opt. Lett. 6(12) 639-641 (1981)

1 × 8 Supergrating wavelength-division demultiplexer in a silica planar waveguide

Xiaoli Fu, Martin Fay, and J. M. Xu
Opt. Lett. 22(21) 1627-1629 (1997)