1 December 1998 1.3-um large spot size laser for efficient fiber coupling
Author Affiliations +
Optical Engineering, 37(12), (1998). doi:10.1117/1.601985
Taper and truncation loss calculations, experimental internal reflections, and far-field characteristics and coupling efficiencies into single-mode fiber are reported for a 1.3-?m large spot laser design with laterally tapered active region and a weakly guiding passive waveguide underneath. In the front passive section, the taper is truncated. Modeled taper loss and truncation loss at the end of the taper are compared. It is shown that for taper lengths exceeding 125 ?m, truncation loss dominates taper loss unless the truncated active width is smaller than ~ 0.2 mm. Reflectometer experiments show that for a truncated active width of 0.2 ?m, reflections at the truncation point are negligible, in agreement with modeling results. Experimental far fields are shown to become narrower and smoother as the taper length or the passive section length is increased. Coupling efficiencies into a single-mode fiber are reported. Up to 56% butt-coupling is achieved, with 1 dB lateral fiber positional tolerance of up to 2.4 ?m horizontally and 2.3 ?m vertically.
Frank H. G. M. Wijnands, Charles Crookes, Paul M. Charles, Nicola Palmer, Michael Chisholm, Simon Wrathall, Adrian J. Taylor, Richard D. Ash, Simon Meadowcroft, "1.3-um large spot size laser for efficient fiber coupling," Optical Engineering 37(12), (1 December 1998). http://dx.doi.org/10.1117/1.601985

Fiber lasers


Fiber coupled lasers

Fiber couplers

Near field


Single mode fibers


Imaging and negative refraction in left-handed metamaterials
Proceedings of SPIE (September 27 2005)
Improving the ruggedness of silicon pore optics
Proceedings of SPIE (July 30 2010)
New concept for in-line OLED manufacturing
Proceedings of SPIE (February 09 2011)
Fly cutting and testing of freeform optics with sub um...
Proceedings of SPIE (October 11 2012)

Back to Top