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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 18,
  • Issue 4,
  • pp. 477-
  • (2000)

Operation Range of VCSEL-Interconnect Links with"Below-Threshold"-Biasing

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Abstract

Biasing lasers below threshold in interconnect links yields a lower effort for the monitoring circuitry, but it leads to a significant turn-on jitter due to the bit-pattern effects and spontaneous emission. An analytical expression describing the probability density function (pdf) of the total turn-on delay for a single-mode vertical-cavity surface-emitting laser (VCSEL) biased below threshold is derived, which accounts for both bit-pattern effects and spontaneous emission. In a high speed digital transmission system both timing jitter as well as the signal-to-noise ratio (SNR) limit the system-performance,which can be measured by the resulting bit-error rate (BER). The measured BER is compared with the calculated BER yielding good agreement. Therefore,following the quite general guideline as presented here, the operation range for"below-threshold"-biased VCSEL-interconnect links can be determined.

[IEEE ]

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