Optical beam scanner with phase‐variable waveguides‐improvement on deflection characteristics

Kazunori Moriki, Kouji Aizawa, Takeo Hattori, Kenichi Iga

    Research output: Contribution to journalArticle

    Abstract

    An optical beam scanner with a variable phase waveguide can perform a high‐speed scanning into an arbitrary angle. Monolithic integration of the scanner with a light source can be realized by means of fabrication with semiconductor materials. However, in principle, the scanned beam has multiple peaks so that the maximum scanning angle and the power efficiency are limited. To relax the limitations and to improve the characteristics, the following methods are investigated in this paper: (1) a method to suppress the subbeams; (2) a method to increase the angle between the main beam and the subbeams; and (3) a method in which the entire envelope is scanned. The following results were obtained. (1) By chirping the waveguide spacing, the limitation of the scan angle due to the existence of the subbeams is removed. (2) By reducing the waveguide spacing and varying the widths of the adjacent waveguides so that the mode coupling between the waveguides is eliminated, the scan angle is increased. (3) Although the fabrication is difficult, the wavefront in the waveguide is tilted so that the envelope itself is scanned and the inherent limitation of the scan angle is eliminated.

    Original languageEnglish
    Pages (from-to)1-11
    Number of pages11
    JournalElectronics and Communications in Japan (Part II: Electronics)
    Volume75
    Issue number5
    DOIs
    Publication statusPublished - 1992 Jan 1

    Keywords

    • Optical beam scanning
    • chirp function
    • chirping
    • far‐field image
    • high‐speed scanning
    • main beam
    • semiconductor waveguide
    • subbeam

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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