Two Mode - (De)muxer Based on a Symmetric Y Junction Coupler, a \(2\times 2\) MMI Coupler and a Ridge Phase Shifter Using Silicon Waveguides for WDM Applications

Dung Cao Truong, Dao Anh Vu, Chung Vu Hoang
Author affiliations


  • Dung Cao Truong
  • Dao Anh Vu
  • Chung Vu Hoang Institute of Materials Science, Vietnam Academy of Science and Technology



two-mode (de)multiplexer, symmetric Y-junction, MMI coupler


In this paper, we introduce a new two-mode (de)multiplexer based on the silicon-on-insulator (SOI) platform. The device is built on a symmetric Y-junction, a 2×2 multimode interference (MMI) waveguide and a phaseshifter in the form of a ridge waveguide which is designed using 3D scalar beam propagation method (BPM). The phase evolution in the structure is discussed in details. Simulation results show that the device can operate in a wide wavelength range (150 nm) with a low insertion loss and small crosstalk. Large fabrication tolerance to the width of the input waveguide up to 100 nm is achieved, which is compatible to the current CMOS manufacturing technologies for the photonic integrated circuits. Furthermore, the small footprint (4µm×286µm) makes the device suitable for applications in high bitrate and compact on-chip silicon photonic integrated circuits.


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N. S. Bergano and C. R. Davidson, “Wavelength Division Multiplexing in Long-Haul Transmission Systemns,” J. Light. Technol., vol. 14, no. 6, pp. 1299–1308, 1996. DOI:

R. Essiambre et al., “Capacity Limits of Optical Fiber Networks,” J. Light. Technol., vol. 28, no. 4, pp. 662–701, 2010. DOI:

A. D. Ellis, J. Zhao, and D. Cotter, “Approaching the Non-Linear Shannon Limit,” J. Light. Technol., vol. 28, no. 4, pp. 423–433, 2010. DOI:

S. L. Jansen, I. Morita, T. C. W. Schenk, and H. Tanaka, “Long-haul transmission of 16x52.5 Gbits/s polarization - division - multiplexed OFDM enabled by MIMO processing,” J. Opt. Netw., vol. 7, no. 2, pp. 173–182, 2008. DOI:

N. Bozinovic et al., “Terabit-Scale Orbital Angular Momentum Mode Division Multiplexing in Fibers,” Science (80-. )., vol. 340, no. 6140, pp. 1545–1548, 2013. DOI:

R. W. Tkach, “Scaling Optical Communications for the Next Decade and Beyond,” Bell Labs Tech. J., vol. 14, no. 4, pp. 3–10, 2010. DOI:

D. J. Richardson, J. M. Fini, and L. E. Nelson, “Space-division multiplexing in optical fibres,” Nat. Photonics, vol. 7, no. April, 2013. DOI:

H. Kubota, M. Oguma, and H. Takara, “Three-mode multi / demultiplexing experiment using PLC mode multiplexer and its application to 2 + 1 mode bi-directional optical communication,” IEICE Electron. Express, vol. 10, no. 12, pp. 1–6. DOI:

S. G. Leon-Saval, N. K. Fontaine, J. R. Salazar-Gil, B. Ercan, R. Ryf, and J. Bland-Hawthorn, “Mode-selective photonic lanterns for space-division multiplexing,” Opt. Express, vol. 22, no. 1, pp. 1036–1044, 2014. DOI:

R. Ryf et al., “Mode-division multiplexing over 96 km of few-mode fiber using coherent 6×6 MIMO processing,” J. Light. Technol., vol. 30, no. 4, pp. 521–531, 2012. DOI:

S. Randel et al., “6×56-Gb/s mode-division multiplexed transmission over 33-km few-mode fiber enabled by 6×6 MIMO equalization,” Opt. Express, vol. 19, no. 17, pp. 16697–16707, 2011. DOI:

M. Salsi et al., “Mode-division multiplexing of 2 × 100 Gb/s channels using an LCOS-based spatial modulator,” J. Light. Technol., vol. 30, no. 4, pp. 618–623, 2012. DOI:

N. Bai et al., “Mode-Division Multiplexed Transmission With Inline Few-Mode Fiber Amplifier,” Opt. Express, vol. 20, no. 3, p. 2668, 2012. DOI:

F. Saitoh, K. Saitoh, and M. Koshiba, “A design method of a fiber-based mode multi/demultiplexer for mode-division multiplexing.,” Opt. Express, vol. 18, no. 5, pp. 4709–4716, 2010. DOI:

B. A. Dorin and W. N. Ye, “A Two-Mode Division Multiplexing Filter Demonstrated Using a SOl Ring Resonator,” in OFC, 2014, vol. 2, pp. 4–6. DOI:

N. Hanzawa et al., “Mode multi/demultiplexing with parallel waveguide for mode division multiplexed transmission,” Opt. Express, vol. 22, no. 24, pp. 29321–29330, 2014. DOI:

A. M. J. Koonen, H. Chen, H. P. A. Van Den Boom, and O. Raz, “Silicon photonic integrated mode multiplexer and demultiplexer,” IEEE Photonics Technol. Lett., vol. 24, no. 21, pp. 1961–1964, 2012. DOI:

Y. Huang, G. Xu, and S. T. Ho, “An ultracompact optical mode order converter,” IEEE Photonics Technol. Lett., vol. 18, no. 21, pp. 2281–2283, 2006. DOI:

T. Uematsu, Y. Ishizaka, Y. Kawaguchi, K. Saitoh, and M. Koshiba, “Design of a compact two-mode multi/demultiplexer consisting of multimode interference waveguides and a wavelength-insensitive phase shifter for mode-division multiplexing transmission,” J. Light. Technol., vol. 30, no. 15, pp. 2421–2426, 2012. DOI:

S. Bagheri and W. M. J. Green, “Silicon-on-Insulator Mode-Selective Add-Drop Unit for On-Chip Mode-Division Multiplexing,” in 6th IEEE International Conference on Group IV Photonics, 2009, pp. 166–168. DOI:

L. Han, S. Liang, H. Zhu, L. Qiao, J. Xu, and W. Wang, “Two-mode de/multiplexer based on multimode interference couplers with a tilted joint as phase shifter.,” Opt. Lett., vol. 40, no. 4, pp. 518–521, 2015. DOI:

J. B. Driscoll, R. R. Grote, B. Souhan, J. I. Dadap, M. Lu, and R. M. Osgood, “Asymmetric Y junctions in silicon waveguides for on-chip mode-division multiplexing.,” Opt. Lett., vol. 38, no. 11, pp. 1854–6, 2013. DOI:

Y. De Yang, Y. Li, Y. Z. Huang, and A. W. Poon, “Silicon nitride three-mode division multiplexing and wavelength-division multiplexing using asymmetrical directional couplers and microring resonators.,” Opt. Express, vol. 22, no. 18, pp. 22172–22183, 2014. DOI:

Y. Li, C. Li, C. Li, B. Cheng, and C. Xue, “Compact two-mode (de)multiplexer based on symmetric Y-junction and Multimode interference waveguides,” Opt. Express, vol. 22, no. 5, p. 5781, 2014. DOI:

M. Y-junctions, J. D. Love, N. Riesen, and A. S. S. Y-junctions, “Single-, Few-, and Multimode Y-Junctions,” J. Light. Technol., vol. 30, no. 3, pp. 304–309, 2012. DOI:

L.-W. Luo et al., “WDM-compatible mode-division multiplexing on a silicon chip,” Nat. Commun., vol. 5, p. 3069, 2014. DOI:

S. T. Lim, C. E. Png, E. A. Ong, and Y. L. Ang, “Single mode, polarization-independent submicron silicon waveguides based on geometrical adjustments,” Opt. Express, vol. 15, no. 18, pp. 11061–72, Sep. 2007. DOI:

A. Ortega-Monux, I. Molina-Fernandez, and J. G. Wanguemert-Perez, “3D-scalar fourier eigenvector expansion method (fourier-EEM) for analyzing optical waveguide discontinuities,” Opt. Quantum Electron., vol. 37, no. 1–3, pp. 213–228, 2005. DOI:

L. B. Soldano and E. C. M. Pennings, “Optical Multi-Mode Interference Devices Based on Self-Imaging: Principles and Applications,” J. Light. Technol., vol. 13, no. 4, pp. 615–627, 1995. DOI:

M. Bachmann, P. A. Besse, and H. Melchior, “General self-imaging properties in N × N multimode interference couplers including phase relations,” Appl. Opt., vol. 33, no. 18, p. 3905, 1994. DOI:

S. H. Jeong and K. Morito, “Novel optical 90o hybrid consisting of a paired interference based 2×4 MMI coupler, a phase shifter and a 2×2 MMI coupler,” J. Light. Technol., vol. 28, no. 9, pp. 1323–1331, 2010. DOI:

P. A. Besse, M. Bachmann, H. Melchior, L. B. Soldano, and M. K. Smit, “Optical Bandwidth and Fabrication Tolerances of Multimode Interference Couplers,” J. Light. Technol., vol. 12, no. 6, pp. 1004–1009, 1994. DOI:

C. D. Truong, D. H. Tran, T. A. Tran, and T. T. Le, “3×3 Multimode interference optical switches using electro-optic effects as phase Shifters,” Opt. Commun., vol. 292, pp. 78–83, 2013. DOI:




How to Cite

D. C. Truong, D. A. Vu, and C. V. Hoang, “Two Mode - (De)muxer Based on a Symmetric Y Junction Coupler, a \(2\times 2\) MMI Coupler and a Ridge Phase Shifter Using Silicon Waveguides for WDM Applications”, Comm. Phys., vol. 27, no. 4, p. 327, Dec. 2017.



Received 13-11-2017
Accepted 13-12-2017
Published 15-12-2017

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