Highly efficient integrated mode de/multiplexing based on modified asymmetric Y-junctions

Hamed Mohammadi; Siamack Eskandarzadeh; Hadi Soofi

doi:10.1117/1.OE.57.4.047101

9 April 2018 Highly efficient integrated mode de/multiplexing based on modified asymmetric Y-junctions

Hamed Mohammadi, Siamack Eskandarzadeh, Hadi Soofi

Author Affiliations +

Optical Engineering, Vol. 57, Issue 4, 047101 (April 2018). https://doi.org/10.1117/1.OE.57.4.047101

Abstract

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.

Citation Download Citation

Hamed Mohammadi, Siamack Eskandarzadeh, and 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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KEYWORDS

Waveguides

Single mode fibers

Silicon

Finite-difference time-domain method

Multiplexing

Waveguide modes

Multiplexers

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