This paper presents a general discussion on the control of widely tunable super structure grating distributed Bragg reflector (SSG-DBR) lasers. A feedback control scheme is presented that ensures frequency stability and accuracy (better than 0.5 GHz), as well as high side mode suppression ratio (>35 dB). The active section voltage is monitored to maintain mode stability and a highly stable Fabry-Perot etalon is used as a reference to lock the laser frequency to a specific ITU channel. It is shown that stability can even be maintained when directly modulating the laser at 1.244 Gb/s. Furthermore,a characterization scheme is demonstrated that uses the voltage monitoring to generate a look-up table of operation points very efficiently and accurately. For all operation points, the frequency accuracy is better than 0.5 GHz and the side mode suppression ratio is above 35 dB.
Gert Sarlet, Geert Morthier, and Roel Baets, "Control of Widely Tunable SSG-DBR Lasers for Dense Wavelength Division Multiplexing," J. Lightwave Technol. 18, 1128- (2000)