Title :
Design and Characterization of Taper Coupler for Effective Laser and Single-Mode Fiber Coupling With Large Tolerance
Author :
Jing, Zhang ; Ramana, Pamidighantam V. ; Hon-Shing, John Lau ; Qingxin, Zhang ; Chandrappan, Jayakrishnan ; Wei, Tan Chee ; Chinq, Jong Ming ; Liang, Calvin Teo Wei ; Lee, Kwong Dim
Author_Institution :
Inst. of Microelectron., Singapore
Abstract :
A new method of coupling the light from a laser diode (LD) to a single-mode fiber with large alignment tolerances and without using any coupling lens is presented. A pseudovertical tapered coupler on silicon substrate which has an input aperture of about 100 times the size of the laser waveguide cross section is designed. Results showed that the coupler relaxes the LD placement tolerance and eliminates the use of a coupling lens. The positional tolerance between the LD and taper coupler can be larger than +/- 5 mu m in the xy plane, and +/-1 deg in orientation.
Keywords :
laser beams; optical fibre couplers; semiconductor lasers; silicon; tolerance analysis; LD; Si; alignment tolerance; laser diode; laser waveguide cross section; positional tolerance; pseudovertical tapered coupler; silicon substrate; single-mode fiber coupling; taper coupler; Diode lasers; Fiber lasers; Laser beams; Lenses; Optical coupling; Optical design; Optical fiber couplers; Optical waveguides; Silicon; Waveguide lasers; Coupling efficiency; laser diode (LD) attachment; single-mode fiber (SMF); taper coupler; tolerance;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.926819
