Abstract
Wavelength tunable semiconductor lasers are important components for use as optical transmitters in wavelength-division multiplexed communications systems.1 A promising structure to provide wide range tuning at 1.55 μm is the fopr-section sampled grating DBR laser2 as shown in Fig. 1. The output wavelength is determined by superimposing the periodic reflectivity spectra of the sampled grating reflectors. By changing the bias applied to one of the sampled gratings, the laser mode will hop in a Vernier manner. To deliver continuous tuning, both grating biases must be changed together. When acting as a transmitter in a wavelength-division multiplexed system, the wavelength of the laser must be stable such that the signal does not corrupt neighboring wavelengths, which may be in use.
© 1996 Optical Society of America
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