Design and simulation of arrayed waveguide grating (AWG) for micro-Raman spectrometer

Yaqin Cheng; Shengfeng Deng; Yingchao Xu; Miao Lu

doi:10.1117/12.977822

15 October 2012 Design and simulation of arrayed waveguide grating (AWG) for micro-Raman spectrometer

Yaqin Cheng, Shengfeng Deng, Yingchao Xu, Miao Lu

Proceedings Volume 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy; 841908 (2012) https://doi.org/10.1117/12.977822
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

Micro Raman spectrometer has broad applications for monitoring harmful chemicals in food, water and environment. Arrayed waveguide grating (AWG) is a promising device to build a dispersive micro Raman spectrometer. Comparing with the widely used demultiplexer in optical communication, AWG in spectrometer is unique due to its broad spectral range and low insert loss. In this paper, a computer algorithm routine was explored to accomplish the design of a broadband, arbitrary AWG structure. First, the focal length, length increment of adjacent waveguide and diffraction order of an AWG were figured out by a MATLAB program, the coordinates was then input into a VBScript program to generate the layout, and the layout was analyzed in OptiwaveBPM software for optical characterization. The proposed MATLAB and VBScript program was verified by the design and simulation of a 800-1000 nm range, 40 channels asymmetric AWG, a spectral resolution of 5 nm was demonstrated with insert loss of 5.03-7.16 dB. In addition, an approach to realize multimode input was introduced to reduce the optical coupling loss. Multimode light beam was firstly converted to a series of single mode beams by the methods proposed by S. G. Leon-Saval et al. in 2005. Next, these single mode beams were coupled into the input star coupler of an AWG. As a proof of this concept, a three inputs, 20 channel, 850-950 nm spectral range AWG was simulated, and merits and drawbacks of this approach were discussed.

Citation Download Citation

Yaqin Cheng, Shengfeng Deng, Yingchao Xu, and Miao Lu "Design and simulation of arrayed waveguide grating (AWG) for micro-Raman spectrometer", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 841908 (15 October 2012); https://doi.org/10.1117/12.977822

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KEYWORDS

Spectroscopy

Waveguides

Stars

Raman spectroscopy

Spectral resolution

Beam propagation method

Computer simulations

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