Ms. Sundas Amin Profile

Sundas Amin

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Proceedings Article | 23 October 2012 Paper

High precision analysis of variations in self image quality and position with Multimode Interference (MMI) device width

Talal Azfar, Sundas Amin, Beena Malik

Proceedings Volume 8412, 841216 (2012) https://doi.org/10.1117/12.2001476

KEYWORDS: Brain-machine interfaces, Waveguides, Image quality, Multimode interference devices, Waveguide modes, Wavelength division multiplexing, Wave propagation, Image acquisition, Single mode fibers, Silicon

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Multimode Interference (MMI) device is a useful optical component for optical power splitter/combiner and router applications. In this paper we present high precision calculation results on the optimum position of self-images in an MMI and their variation due to wavelengths, for WDM applications. We show that the commonly used MMI self-image position calculation methods, using the beat length of two lowest order modes or effective MMI width approximation, lead to significant deviations from the optimum self-image position. We calculate the optimum position of the self-image by finding the maximum value of overlap integral of total MMI field, comprised of all MMI modes, with the total field at the input of the MMI device. In addition, for the optimum output power coupling distance for MMI, we calculate the overlap integral of the total MMI field with the output waveguide field. Both these methods give approximately the same optimum length. We obtain up to 60 um difference in optimum self-image position for a Si MMI (width =15 ~ 30 um), and refractive index difference of 0.02 between core and cladding, from the approximations based methods. We also calculate the variation of this image position in 1.50 um to 1.60 um wavelength region. We show that the optimum image position is strongly dependent on wavelength, with up to 100 um variations in this wavelength range. In addition, we show that there is a significant variation in this self image position with MMI widths, at points where a new power carrying mode is added.

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