Sampled grating DBR laser arrays with adjustable 0.8/1,6-nm wavelength spacing

The difficulty in fabricating multiwavelength laser arrays with uniform wav elength spacing is overcome by using sampled grating distributed Bragg refl ector (DBR) lasers as the constituent of a laser array. The sampling period s of the DBR mirrors are varied from laser to laser to provide reflection c ombs with different spacings in wavelength. Arrays of twelve lasers have be en successfully fabricated with a single holographic exposure step, The wav elength spacing among the lasers can be adjusted to be around 0.8 or 1.6 nm with a simple tuning mechanism.