Patent ID: 8705584

Claim:
A DBR laser diode comprising a DBR section and a gain section, wherein: the DBR section comprises a wavelength selective grating; the wavelength selective grating is characterized by an aperiodically shifted grating phase φ and a Bragg wavelength λ B ; the aperiodically shifted grating phase φ is substantially symmetric or substantially π-shifted symmetric relative to a midpoint C L or shifted midpoint C L * of the DBR section along the optical axis of the DBR laser diode; the phase φ of the wavelength selective grating is characterized by aperiodic phase jumps of magnitude φ J1, J2, . . . and segment lengths l 0, 1, . . . ; the phase jumps of the wavelength selective grating are arranged substantially symmetrically about a midpoint C L or shifted midpoint C L * of the DBR section along the optical axis of the DBR laser diode; and at least two phase jumps reside on each side of the midpoint C L or shifted midpoint C L * of the DBR section.