Optimal design for a MMI to flatten the spectral response of an AWG

Daoxin Dai; Qincun Zhou; Sailing He; Jianjun He

doi:10.1117/12.481267

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28 August 2002 Optimal design for a MMI to flatten the spectral response of an AWG

Daoxin Dai, Qincun Zhou, Sailing He, Jianjun He

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Proceedings Volume 4904, Optical Fiber and Planar Waveguide Technology II; (2002) https://doi.org/10.1117/12.481267
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China

Abstract

A flattened spectral response for an arrayed-waveguide grating (AWG) can be obtained by using a multimode interference (MMI) coupler. In the present paper, an analytical expression for the flattened spectral response is derived by using a Gaussian approximation. A simple formula relating the optimal MMI length and the normalized separation is given. The normalized separation describes the separation between the peaks of the two fold images in the MMI region. With the present formula, the optimal value for the MM! length can be obtained for a given normalized separation determined by a required 1dB passband width. By using the present optimal design method, a flattened spectral response for an AWG is obtained. The optimal design result obtained from the present analytical formula is verified by a beam propagation method.

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Daoxin Dai, Qincun Zhou, Sailing He, and Jianjun He "Optimal design for a MMI to flatten the spectral response of an AWG", Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); https://doi.org/10.1117/12.481267

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