Abstract

Three-section distributed Bragg reflector (TS DBR) lasers are attractive candidates for use in multiwavelength optical networks since they can be tuned electronically over a wide wavelength range. In packet-switched applications, the wavelength switching speed is a key parameter, while the stability of tuning is a critical issue for narrow channel spacings. In general, it is desirable to have fast tuning with arbitrary holding times. Therefore, it is important to study the dynamic tuning characteristics of such lasers. We have investigated the speed and stability of tuning in a TS DBR laser. A rise time of ~5 ns has been observed in the tuning response for wavelength swings of 0.1-0.3 nm. Over 5.0 μs, an ~50% wavelength drift (0.11-nm drift for 6.7 mA) due to thermal effects has been observed. These direct measurements of dynamic wavelength tuning confirm earlier results,¹ and moreover they reveal the dynamic nature of the carrier and thermal effects involved in an explicit manner that is very useful in understanding and improving the tuning performance at both the subsystem and device levels.

© 1990 Optical Society of America