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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 17,
  • Issue 7,
  • pp. 1222-
  • (1999)

A High-Speed Mixed Digital-to-Analog Circuit Board for Accurate Control of Wavelength Tunable Lasers for Fiber-Optic Communications

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Abstract

A mixed digital-to-analog (D/A) high-speed circuit board capable of driving a tunable super structure grating distributed Bragg reflector (DBR) laser is developed. The circuit is used to control the laser over a 20-nm tuning wavelength range with 0.1 nm resolution. Three control currents are preprogrammed into an electrically erasable/programmable read-only memory (EEPROM) look-up table for each wavelength. Upon receiving a differential logic control signal, the circuit tunes the laser to the specified output wavelength within 500 ns. The long-term repeatability of the tuned laser output wavelength shows drift below 0.02 nm with greater than 100 h of operation.

[IEEE ]

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