Vertical-coupling optical interface for on-chip optical interconnection

Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan.
Optics Express (Impact Factor: 3.49). 01/2011; 19(2):698-703. DOI: 10.1364/OE.19.000698
Source: PubMed


We present a vertical-coupling optical interface with a grating coupler for transmitting and receiving optical signals between single-mode optical fibers and microphotonic waveguides with a view to realize on-chip optical interconnection. The optical interface consisting of a simple grating structure with a reflective mirror and an optical power combiner exhibits high optical coupling efficiency and wide tolerance range for the misalignment of optical fibers. The optical interface exhibits high coupling efficiency even if the optical input is almost vertical to the chip surface.

Download full-text


Available from: Keishi Ohashi
  • Source
    • "In addition, the out-of-plane output interface of the device configuration eliminates its ability to integrate with other on-chip waveguide devices. Recently, a vertical coupling optical interface was proposed and realized for on-chip optical interconnect [14]. Both high efficiency and wide misalignment tolerance range were demonstrated. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A vertical grating coupler on silicon-on-insulator substrates has been designed and demonstrated. The light from a vertical fiber can be coupled in and split equally into two arms with the fiber placed in the grating center. An optical combiner is used to collect the transmission from the two arms. The measured peak coupling efficiency is 37%. Our device can also function like a Mach-Zehnder interferometer. In a device with an arm difference of 30 μm, the normalized transmission spectra of 20-nm free spectral range and more than 12-dB extinction ratio at 1567 nm are obtained.
    Full-text · Article · Feb 2013 · IEEE Photonics Technology Letters
  • [Show abstract] [Hide abstract]
    ABSTRACT: We demonstrate vertical chip-to-chip light coupling using silicon strip waveguide cantilever couplers. The guided-wave couplers consist of silicon strip waveguides embedded within silicon dioxide cantilevers. The cantilevers deflect 90° out-of-plane via residual stress, allowing vertical light coupling between separate chips. A chip-to-chip coupling loss of 2.5 dB per connection is measured for TE polarization and 1.1 dB for TM polarization at 1550 nm wavelength. The coupling loss varies by less than±0.8 dB within the wavelength range from 1500 nm to 1565 nm for both polarizations. The couplers enable broadband and compact system architectures involving high speed vertical data transport between photonic integrated circuits.
    No preview · Article · Feb 2011 · Optics Express
  • [Show abstract] [Hide abstract]
    ABSTRACT: We propose a novel vertical optical coupler using subwavelength high contrast grating. The surface normal incidence light can be coupled into the in-plane waveguide with peak efficiency of 92% over a broad wavelength range. Such structure can be also designed as the in-plane reflector or in-plane to vertical coupler. The reflectivity for waveguide propagation mode is 97.5% and the coupling efficiency is 96%, respectively.
    No preview · Article · Feb 2012 · Proceedings of SPIE - The International Society for Optical Engineering
Show more