High sensitivity precision relative intensity noise calibration standard using low noise reference laser source

M. C. Cox, N. J. Copner, B. Williams

Research output: Contribution to journalArticlepeer-review

Abstract

The intensity noise of laser diodes is an increasingly important parameter for broadband analogue and high data rate telecommunication systems. The authors describe a new primary calibration standard for measuring the relative intensity noise (RIN) as a function of frequency (up to 20 GHz) with high sensitivities (< -171dBm/Hz). In addition a new optical technique has been developed based on a low noise optical source which provides an adjustable shot noise level. By comparing this flat noise spectrum with the test spectrum the main traceable path is provided by the measured DC photocurrent. Errors due to responsivity, gain, mismatch etc., as a function of frequency are significantly reduced and precisions of < 0.4 dB have been achieved.

Original languageEnglish
Pages (from-to)163-165
Number of pages3
JournalIEE Proceedings - Science, Measurement and Technology
Volume145
Issue number4
DOIs
Publication statusPublished - 1998
Externally publishedYes

Keywords

  • Laser diodes
  • Measurement standards
  • Relative intensity noise

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