Multimode add-drop multiplexing by adiabatic linearly tapered coupling.

Optics Express (Impact Factor: 3.53). 12/2005; 13(23):9381-7. DOI: 10.1364/OPEX.13.009381
Source: PubMed

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.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Submicron silicon-on-insulator (SOI) optical waveguides, which has ultra-high index contrast and ultra-small cross section, provide a very promising way to realize nano-photonic integrated circuits (PICs) with high integration density. Mode conversion and coupling play an important role for realizing various functionality elements. In this paper, a review is given for our recent work including the following parts. First, we discuss the polarizationdependent mode conversion happening in an adiabatic submicron SOI optical waveguide tapers and the application to realize polarization rotation with simple fabrication processes. Second, the mode coupling/conversion in an asymmetrical directional coupler (ADC) is summarized. The application for ADCs includes the realization of ultrasmall polarization-beam splitters (PBS) as well as ultra-compact broadband mode multiplexers (which is very important to enable ultra-high speed optical interconnects with a multimode optical waveguide).
  • [Show abstract] [Hide abstract]
    ABSTRACT: Coupling between a single-mode ring resonator and a two-mode bus waveguide is investigated theoretically and experimentally to achieve sharp resonant lineshape slopes of the difference of the two mode power transmissions. Fano-shaped output lineshapes are shown to depend on the coupling coefficients, relative power distribution, and relative phase difference of the two input modes. A device is fabricated in a polymer and silicon dioxide material system by a photolithographic process. The transmissions of the two modes are measured via on-chip add-drop mode filters. Measurements of the two-mode-coupled resonator device result in a lineshape slope of 27.1 nm$^{-1}$. The technique exploits spatial mode orthogonality to realize co-located coupling ports to the resonator. Photonic circuit layouts are simplified and the number of waveguide crossings are reduced in applications utilizing a dense array of resonators producing sharp asymmetrical Fano-shaped resonance transmissions.
    Journal of Lightwave Technology 10/2010; 28(20). · 2.86 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A compact and broadband mode (de)multiplexer utilizing the asymmetrical directional coupling between a hybrid plasmonic waveguide and a silicon nanowire waveguide is proposed. The coupling length is 13.6 μm, which is the shortest in TE0 and TE1 mode multiplexers reported, to the best of our knowledge. It shows a high mode conversion efficiency of 99.2% with excess loss of only 0.35 dB at 1550 nm. The mode multiplexing circuit exhibits a low crosstalk of less than −17 dB over a large bandwidth of 100 nm.
    Applied Optics 09/2014; 53(27). · 1.69 Impact Factor