Abstract

Multimode multiplexing can potentially replace WDM for implementing multichannel short reach interconnects. Multiple optical modes can thus be exploited as the channels for transferring optical data, where each mode represents an independent data channel. The basic building block of the system is a Mode Add/Drop which can be implemented based on adiabatic power transfer. We propose a new scheme for realization of such adiabatic mode add drop with a predefined coupling profile, and demonstrate it by employing a linearly decreasing coupling coefficient along the propagation length. Realization using Silicon-On-Insulator (SOI) platform is discussed - which offers the possibility of direct integration of the optoelectronic circuitry with the Si processor.

© 2005 Optical Society of America

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References

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  1. D. A.B. Miller, "Rationale and Challenges for Optical Interconnects to Electronic Chips," Proceedings of the IEEE 88, 728-749, (2000).
    [CrossRef]
  2. S. Berdague and P. Facq, "Mode division multiplexing in optical fibers," Appl. Opt. 21, 1950-1955,(1982).
    [CrossRef] [PubMed]
  3. Y. Yadin and M. Orenstein, "Parallel optical interconnects over multimode waveguides," 15th Annual Workshop on Interconnections Within High Speed Digital Systems Santa Fe, NM (2004).
  4. R.W.C. Vance and J.D. Love, "Asymmetric adiabatic multiprong for mode-multiplexed systems," J. Electr. Lett. 29, 2134-2136, (1993).
    [CrossRef]
  5. K. Y. Song, I. K. Hwang, S. H. Yun, and B. Y. Kim, "High performance fused-type mode-selective coupler using elliptical core two-mode fiber at 1550 nm," IEEE J. Photonics Technol. Lett. 14, 501�??503, (2002).
    [CrossRef]
  6. E. Narevicius, "Method And Apparatus For Optical Mode Division Multiplexing And Demultiplexing," WO 03/100490 A1, 28.05.2003 (pending).
  7. B. Jalali, P.D. Trinh, S.Yegnanarayanan, F.Corppinger, "Guided-wave optics in silicon-on-insulator technology," IEEE Proc-Optoelectron 143, 307-311, (1996).
    [CrossRef]
  8. W. K. Burns, A.F. Milton, "Mode Conversion in Planar-Dielectric Separating Waveguides," J. Quantum. Electron. 11, 32-38, (1975).
    [CrossRef]
  9. A.F. Milton, W.K. Burns, "Tapered Velocity Couplers for Integrated Optics: Design," Appl. Opt. 14, 1207-1212, (1975).
    [CrossRef] [PubMed]
  10. D. Marcuse, Chapter 3 in " Theory of Dielectric Optical Waveguides," Sec. Ed., Academic Press, Boston San Diego, New York, 1972
  11. A.F. Milton, W.K. Burns, "Mode Coupling in Tapered Optical Waveguide Structures and Electro-Optic Switches," IEEE Trans. Circuts Syst. 26, 1020-1028, (1979).
    [CrossRef]
  12. A. Yariv, "Coupled-Mode Theory for Guided-Wave Optics," J.Quantum. Electron. 9, 919-933, (1973).
    [CrossRef]
  13. T. A. Ramadan, R.Scarmozzino, R. M. Osgood, "Adiabatic Couplers: Design Rules and Optimization," J. Lightwave Technol. 16, 277-283, 1998.
    [CrossRef]

Appl. Opt. (2)

IEEE J. Photonics Technol. Lett. (1)

K. Y. Song, I. K. Hwang, S. H. Yun, and B. Y. Kim, "High performance fused-type mode-selective coupler using elliptical core two-mode fiber at 1550 nm," IEEE J. Photonics Technol. Lett. 14, 501�??503, (2002).
[CrossRef]

IEEE Proc-Optoelectron (1)

B. Jalali, P.D. Trinh, S.Yegnanarayanan, F.Corppinger, "Guided-wave optics in silicon-on-insulator technology," IEEE Proc-Optoelectron 143, 307-311, (1996).
[CrossRef]

IEEE Trans. Circuts Syst. (1)

A.F. Milton, W.K. Burns, "Mode Coupling in Tapered Optical Waveguide Structures and Electro-Optic Switches," IEEE Trans. Circuts Syst. 26, 1020-1028, (1979).
[CrossRef]

J. Electr. Lett. (1)

R.W.C. Vance and J.D. Love, "Asymmetric adiabatic multiprong for mode-multiplexed systems," J. Electr. Lett. 29, 2134-2136, (1993).
[CrossRef]

J. Lightwave Technol. (1)

T. A. Ramadan, R.Scarmozzino, R. M. Osgood, "Adiabatic Couplers: Design Rules and Optimization," J. Lightwave Technol. 16, 277-283, 1998.
[CrossRef]

J. Quantum. Electron. (1)

W. K. Burns, A.F. Milton, "Mode Conversion in Planar-Dielectric Separating Waveguides," J. Quantum. Electron. 11, 32-38, (1975).
[CrossRef]

J.Quantum. Electron. (1)

A. Yariv, "Coupled-Mode Theory for Guided-Wave Optics," J.Quantum. Electron. 9, 919-933, (1973).
[CrossRef]

Proceedings of (1)

D. A.B. Miller, "Rationale and Challenges for Optical Interconnects to Electronic Chips," Proceedings of the IEEE 88, 728-749, (2000).
[CrossRef]

Other (3)

D. Marcuse, Chapter 3 in " Theory of Dielectric Optical Waveguides," Sec. Ed., Academic Press, Boston San Diego, New York, 1972

Y. Yadin and M. Orenstein, "Parallel optical interconnects over multimode waveguides," 15th Annual Workshop on Interconnections Within High Speed Digital Systems Santa Fe, NM (2004).

E. Narevicius, "Method And Apparatus For Optical Mode Division Multiplexing And Demultiplexing," WO 03/100490 A1, 28.05.2003 (pending).

Supplementary Material (1)

» Media 1: AVI (139 KB)     

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Figures (5)

Fig. 1.
Fig. 1.

Schematic chart illustrating the concept of Mode Division Multiplexing with constant optical bus.

Fig. 2.
Fig. 2.

(a) Coupling strength K(z), for different α.. (b) Corresponding Δβ(z) for different α. Δβ(L) is finite only for α=αmax . (c) X(z) for different α. (d) X(Δβ) for different α.

Fig. 3.
Fig. 3.

(a) The x-y crossection of the SOI waveguides. (b) The x-z layout of the optical Mode Add/Drop.

Fig. 4.
Fig. 4.

(a) Propagation constants (normalized by k 0) vs. the ridge width of the “add” waveguide and propagation constants of the 2nd, 3rd, 4th modes of the “bus” waveguide (mm=multi mode). (b) Coupling coefficient between the fundamental mode of “add” waveguide and the 3rd mode of the “bus” vs. waveguide spacing. The calculation is performed at constant ridge width of the “add” waveguide.

Fig. 5.
Fig. 5.

(a) The propagation x-z crossection for coupling to the 3rd mode of the multi-mode waveguide (Add operation). (b) The powers at the 2nd, 3rd, 4th modes of the “bus” waveguide and the fundamental mode of the “add” waveguide. [Media 1]

Equations (7)

Equations on this page are rendered with MathJax. Learn more.

d A j dz = 1 2 ( X 2 ( z ) + 1 ) dX dz A i j β j ( z ) A j
d A i dz = 1 2 ( X 2 ( z ) + 1 ) dX dz A j j β i ( z ) A i .
dX dz = 4 γ K ( z ) ( X 2 ( z ) + 1 ) 3 2 .
X 2 ( z ) = 16 γ 2 ( K 0 z α z 2 2 ) 2 1 16 γ 2 ( K 0 z α z 2 2 ) 2 .
z 2 2 α K 0 z + 1 2 αγ = 0 ,
L ( α ) = K 0 α ± 1 2 4 K 0 2 α 2 2 αγ ,
4 K 0 2 α 2 2 αγ > 0 α 2 γ K 0 2 = α max .

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