| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Research Abstract |
In this project, compact wavelength detectors for multiwavelength opto-electronic integrated circuits (multiwave OEICs) were developed. Performances of the proposed devices were evaluated to analyze the impact of wavelenght multiplexing for reducing communication subsystem complexity in parallel computing architectures.
1. A compact wavelength detector using a dielectric multilayr thin-film (DMF) filter deposited on a silicon pn photodiode was designed and fabricated. DMF filter areas were successfully defined on a silicon substrate by employing lift-off technique using an evaporated Al film as a lift-off stencil. Finally, a one-chip wavelength detector array was implemented, demonstrating successful discrimination of four wavelength components within 635-830nm range.
2. Fabrication of the proposed device structures will become increasingly difficult as the number of wavelengths in creases. To solve this problem, a new type of wavelength detector array employing a single DMF filter was proposed, and its performance was evaluated through computer simulation.
3. The physical limit on the number of wavelength components that can be used in multiwave OEICs was examined. For example, assuming the width of waveguides, the thickness of DMF filters and the total gain bandwidth of lasers to be 20mum, 8mum and 100nm, respectively, it is estimated that eight wavelength components are available in the system. This number offers the potential for reducing area complexity of hypercube-based interconnection networks by the factor of 1/64 on an average. This demonstrates the impact of wavelength multiplexing for reducing communication subsystem complexity in future computers.
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