Title :
Tolerance analysis of aligning an astigmatic laser diode with a single-mode optical fiber
Author :
Wang, L.A. ; Su, C.D.
Author_Institution :
Inst. of Electro-Optical Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
12/1/1996 12:00:00 AM
Abstract :
A general method of analyzing misalignment tolerance of coupling light from an astigmatic laser diode to a single-mode fiber is described. We apply the method to derive the 3 dB tolerances caused by longitudinal, lateral, and angular misalignments in the optimal conditions for two kinds of coupling schemes. One is by the use of a rotationally symmetric optical system, and the other by a rod which is a special case of utilizing a rotationally asymmetric optical system. In the latter coupling case, the misalignment caused by a laser is found to have a much less 3 dB tolerance in the vertical direction than that caused by a fiber
Keywords :
optical couplers; optical fibre couplers; optimisation; semiconductor lasers; 3 dB tolerances; angular misalignments; astigmatic laser diode alignment; coupling schemes; lateral misalignments; longitudinal misalignments; optimal conditions; rotationally asymmetric optical system; rotationally symmetric optical system; single-mode optical fiber coupling; tolerance analysis; vertical direction; Diode lasers; Fiber lasers; Laser beams; Laser modes; Laser theory; Lenses; Optical coupling; Optical fiber communication; Optical fibers; Tolerance analysis;
Journal_Title :
Lightwave Technology, Journal of
