Control of lasing wavelength in distributed feedback lasers by angling the active stripe with respect to the grating

In this letter, we propose and demonstrate a new and very simple technique of varying the lasing wavelength of DFB lasers without fabricating different grating-pitches. This is accomplished by angling the active stripe at an oblique angle with respect to the grating-lines. The active stripe guiding the propagating mode is tilted at an angle with respect to the line perpendicular to the grating-lines (the axis)