High dynamic range linear analogue data links (1-20GHz) using room temperature DFB laser diodes

Ian H. White, Peter Hartmann, Jonathan D. Ingham, Matthew Webster, David Wake, Adrian Wonfor, Richard V. Penty, Alwyn J. Seeds, J. Kenton White

Research output: Contribution to journalConference articlepeer-review

8 Citations (SciVal)


We report the analysis and application of uncooled, directly-modulated high-speed DFB lasers with emphasis on their analogue transmission performance. Fibre-optic links employing such lasers are shown to meet the most stringent requirements of analogue systems at both high carrier frequencies and high temperatures. Spurious-free dynamic ranges (SFDR) exceeding 100dB·Hz 2/3 and 90dB·Hz2/3 and input third-order intercept points (IIP3) above 20dBm and 18dBm are reported for carrier frequencies up to 20GHz at 25°C and up to 10GHz at 85°C, respectively. The error-vector magnitude (EVM) for a 256-QAM modulated signal transmitted over 15km of SMF remains below 1.9% for carrier frequencies of both 2GHz and 5GHz for all measured temperatures. The link performance is assessed by using 3GPP W-CDMA, IEEE 802.11a and IEEE 802.11b signals. In all cases the EVM remains within the standard specification, for fibre-optic link lengths of up to 10km and laser operating temperatures of up to 70°C. Finally, an IEEE 802.11b WLAN demonstrator is presented, allowing antenna remoting over up to 1000m of 62.5/125μm MMF.

Original languageEnglish
Pages (from-to)55-66
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 3 May 2004
EventUltrahigh- and High-Speed Photography, Photonics and Videography - San Diego, CA, USA United States
Duration: 7 Aug 20038 Aug 2003


  • Analogue modulation
  • Antenna remoting
  • Distributed feedback laser
  • Error-vector magnitude
  • IEEE 802.11a
  • IEEE 802.11b
  • Spurious-free dynamic range
  • WLAN

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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