Gb/s Eye Diagram of VCSEL

• New technology has sub-mA drive current

• VCSELs used in LAN applications:

  • ATM/SONET
  • Gigabit Ethernet/Fiber Channel

1.25 Gb/s (800 ps/bit)

231-1 NRZ PRBS

No errors

Eye-opening:

560 ps (70%) / 385 mV at 10-7 BER

Maximum bit rate:

1.7 Gb/s at 10-9 BER

200 ps/div

History of the Vertical Cavity Surface Emitting Laser

1979 - Invented in Japan

1980s - Improved at AT&T Bell Laboratories and Bellcore

1990 - 1999 - Developed by US Government / Industry partnership

1997 - Commercial product in US

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