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History

1976-1988

1976

  • · [ Establishment of Large Scale Integrated Memory Division ]
  • · Corroboration of Long Wave Length Band Optical

1977

  • · Fabrication of a 64 kbit Memory (DRAM)
  • · Fabrication of Optical Fiber by Vapor-phase Axial Deposition
DRAM

1978

  • · Invention of SIMOX Technology

1979

  • · Development of a Single-chip LSI for PARCOR Speech Synthesis
  • · Fabrication of a 256 kbit Memory (DRAM)
  • · Development of 0.2 dB/km very low loss Optical Fiber
Single-chip LSI for PARCOR Speech Synthesis

1980

  • · Development of Super-High-Purity Optical Fiber
  • · Invention of Master Key Method of Public Key Cryptosystem
  • · Sustained Room Temperature Operation of 1.55 µm Semiconductor Laser
Sustained Room Temperature Operation of 1.55 µm Semiconductor Laser
Semiconductor Laser

1981

  • · Fabrication of CMOS 32 Bit VLSI Processor* Sustained Room Temperature Operation of DFB Laser

1982

  • · [ Establishment of Functional Device Research Department ]
  • · Measurement of Soliton transmission on Joseffson transmission line
  • · Fabrication of 1 Mbit Memory (DRAM)
Fabrication of Gallium Arsenide 1Kbit LSI Memory
  • · Gallium Arsenide 1Kbit LSI Memory

1983

  • · [ Establishment of Atsugi Electrical Communications Laboratories ]
Atsugi Electrical Communications Laboratories

1984

  • · [ Establishment of Information Communications and Materials science basic Research Department ]
  • · Achievement of a dislocation-free 2inch Gallium Arsenide Crystal

1985

  • · [ Privatization, the Birth of Nippon Telegraph and Telephone Corporation ]
  • · [ Establishment of Basic Research Laboratories ]
  • · Invention of Migration Enhanced Epitaxy (MEE)
the Birth of Nippon Telegraph and Telephone Corporation
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1986

  • · Development of High-Speed Fabrication of Single-mode Optical Fiber using the Full VAD Synthesis Process
  • · Invention of Phonocode Speech Encoding Method
  • · Development of Travelling Wave Semiconductor Optical Amplifier
  • · Invention of 1.5µm band Zero Dispersion Fiber
  • · Development of Planar Light Wave Circuit (PLC) Design and Fabrication Technology
  • · Development of DS Type Optical Connectors
PLC

1987

  • · [ Establishment of LSI Laboratories, and Opto-electronics Laboratories ]
  • · Development of Ballistic Carrier Transistor (BCT)
  • · Fabrication of 16 Mbit Level DRAM TEST Devices
  • · Fabrication of Oxide Superconductor Thin Films
  • · Generation of Amplitude Squeezed Light in Semiconductor Lasers
  • · Successful control of Neurite Growth Orientation
  • · Successful Emission of SOR Light
PLC

1988

  • · Development of High Speed LSI Probing Technology (EOS)
  • · Fabrication of Narrow Spectrum Line Width Multi-electrode DFB Laser
  • · Practical Use of SC Type Optical Connectors
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