Title :
A two-step laterally tapered 1.55-μm SSC DFB laser fabricated by using a nonselective grating process
Author :
Park, S.W. ; Moon, C.K. ; Kim, Dong Yeong ; Kim, Young Keun ; Song, J.I.
Author_Institution :
Dept. of Inf. & Commun., Kwang-Ju Inst. of Sci. & Technol., Gwangju, South Korea
fDate :
3/1/2004 12:00:00 AM
Abstract :
We demonstrate a two-step laterally tapered 1.55-μm spot size converter distributed feedback laser diode (SSC DFB LD) having a planar buried heterostructure-type active waveguide and a ridge-type passive waveguide fabricated by using a nonselective grating process. Unlike conventional SSC DFB LDs, where a selective grating is employed, this SSC DFB LD employed a nonselective grating over the entire device region in order to make its fabrication much simpler than that of the conventional SSC DFB LDs. The two-step laterally tapered SSC is effective in removing an unwanted wavelength peak originating from the SSC section having a multiquantum well and a grating under it. The fabricated SSC DFB LD operates at 1.553-μm wavelength and shows a far field pattern in horizontal and vertical directions of 13.4/spl deg/ and 19.5/spl deg/, respectively.
Keywords :
diffraction gratings; distributed feedback lasers; optical fabrication; optical planar waveguides; ridge waveguides; semiconductor lasers; 1.553 mum; fabricated SSC DFB LD; far-field pattern; multiquantum well; nonselective grating process; planar buried heterostructure-type active waveguide; ridge-type passive waveguide; spot size converter distributed feedback laser diode; two-step lateral tapering; two-step laterally tapered SSC DFB laser; unwanted wavelength peak removal; Diode lasers; Distributed feedback devices; Fabrication; Gratings; Moon; Optical coupling; Optical feedback; Optical fiber communication; Optical waveguides; Planar waveguides;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.823721
