Title :
Fibre-optic variable delay lines
Author :
Bowers, J.E. ; Newton, S.A. ; Shaw, H.J.
Author_Institution :
Stanford University, Edward L. Ginzton Laboratory, Stanford, USA
Abstract :
A technique is presented for fabricating large numbers of evanescently coupled taps on a single-mode fibre. An output fibre can be adjusted between any of the taps, resulting in a discretely variable delay. The concept was demonstrated with a 7 tap device which had a 2.5 ns delay between taps and a tap uniformity of ± 1.6 dB. A technique for making continuously variable delay lines is presented.
Keywords :
delay lines; fibre optics; optical couplers; optical workshop techniques; continuously variable delay lines; discretely variable delay; evanescently coupled taps; fibre optic delay lines; fibre optic directional coupler; single-mode fibre;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19820684
