Light coupling from a junction laser into a monomode fibre with a glass cylindrical lens on the fibre end

✍ Scribed by E. Weidel

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 528 KB
• Volume: 12
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/0030-4018(74)90081-9

✦ Synopsis

A new method of producing a small cylindrical glass lens on the end of a glass fibre is described. The intensity distribution in the focal plane of such a lens formed on the end face of a monomode fibre was measured. An improvement factor of 2.5 in the coupling efficiency into the fibre from a stripe geometry GaAs laser was observed. The tolerances of the coupling laser-fibre are carefully measured. In contrast to previous work it is shown that the improvement in coupling efficiency is obtained only at the expense of much tighter alignment tolerances.