Design and Fabrication of the Coherent-Coupled Vertical Cavity Surface Emitting Laser Arrays for Fiber Optic Communications

Project: National Science and Technology CouncilNational Science and Technology Council Academic Grants

Project Details

Abstract

The key factor for the development of local area network (LAN) is based on how to build up a data transmission system with high-speed, high reliability and cost-efficiency. With the merits of low manufacturing cost as well as the unique features, vertical cavity surface emitting lasers (VCSELs) have been thought as the preferential candidate in LAN. In addition, the well-established AlGaAs VCSELs are attractive, since inexpensive facilities such as Si photodiode and high bandwidth fiber are available. In order to enhance the capability of fiber optic communication in high speed over long distance, we will dedicate to improve the laser features involving light output power, emission spectrum, and beam profile, etc. It’s been shown the oxide-confined VCSELs have better characteristics than the traditional ones. With reduction the size of the oxide aperture to the point where only the fundamental mode is supported, we can succeed in fabricating a single transverse mode VCSEL. However, the drawback of this approach is the lower light output power, and a reduced laser lifetime due to the small active volume. Besides, when light pass through the narrow oxide aperture the diffraction effect becomes obvious and thus deteriorates the fiber coupling efficiency. Instead of the conventional VCSELs, we will study and fabricate the “Coherently Coupled Oxide-Confined VCSEL Array” in this project. Based upon the respective element couples coherently into an in-phase array mode and the oxidizing aperture provides the confined scheme for carrier and optics, this state of the art light source would be suitable for high-speed local area optic communication. With using a shallow surface relief and ion implant techniques to locally quench the out-of-phase array elements, these devices could meet the demands of single mode, high power (> 10 mW), high-speed (10 Gbps), and high reliability in local data transmission. Experimentally, we will use transfer matrix method along with simulation software to design VCSELs and optimize the geometry of laser array. After completed manufacturing process, we shall also investigate the dc and dynamic characteristics of these devices. Finally, we will perform large signal analysis by using the coherent-coupled VCSEL array for data transmission over long distance.

Project IDs

Project ID:PB9709-3573
External Project ID:NSC97-2221-E182-049
StatusFinished
Effective start/end date01/08/0831/07/09

Keywords

  • Local area network
  • Surface emitting lasers
  • Oxide-confined
  • Coherent-coupled laser array

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