9 April 2018 Highly efficient integrated mode de/multiplexing based on modified asymmetric Y-junctions
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Asymmetric Y-junctions at which a wide waveguide is divided into several waveguides with different widths are commonly employed as mode de/multiplexers. These structures are inherently wide-band and simple in design and fabrication. However, the cross talk between modes increases rapidly as the number of modes increases, limiting the application of these structures to four modes and below. The design methodology of low cross talk-integrated mode de/multiplexers based on asymmetric Y-junctions is presented. It is shown that the difference between mode-effective indices plays a crucial role in determining the cross talk. A modified asymmetric Y-junction structure is presented to minimize the cross talk and based on this structure, six- and eight-mode de/multiplexers are designed utilizing a silicon-on-insulator platform. Finite-difference time-domain (FDTD) simulations are performed for the presented structures, and it is shown that the maximum cross talk is as low as −8 and −7  dB for six- and eight-mode de/multiplexers, respectively. The design of a low cross talk 10-mode de/multiplexer based on the proposed method is also discussed.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2018/$25.00 © 2018 SPIE
Hamed Mohammadi, Hamed Mohammadi, Siamack Eskandarzadeh, Siamack Eskandarzadeh, Hadi Soofi, Hadi Soofi, "Highly efficient integrated mode de/multiplexing based on modified asymmetric Y-junctions," Optical Engineering 57(4), 047101 (9 April 2018). https://doi.org/10.1117/1.OE.57.4.047101
Received: 13 December 2017; Accepted: 16 March 2018; Published: 9 April 2018


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