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A high-speed mixed digital-to-analog circuit board for accurate control of wavelength tunable lasers for fiber-optic communications

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4 Author(s)
Biemacki, P.D. ; Naval Res. Lab., Washington, DC, USA ; Frankel, M.Y. ; Gingerich, Michael E. ; Matthews, P.J.

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

Published in:

Lightwave Technology, Journal of  (Volume:17 ,  Issue: 7 )