H. Bissessur et al., RIDGE LASER WITH SPOT-SIZE CONVERTER IN A SINGLE EPITAXIAL STEP FOR HIGH COUPLING EFFICIENCY TO SINGLE-MODE FIBERS, IEEE photonics technology letters, 10(9), 1998, pp. 1235-1237
We report on a 1.55-mu m laser diode with an integrated spot-size conv
erter fabricated in a single epitaxial step using conventional photoli
thography. The laser structure uses a conventional ridge guide for the
active layers and a second larger ridge for the passive waveguide. Lo
w-beam divergence of typically 9 degrees x 9 degrees results in about
3-dB coupling losses with a cleaved optical fiber.