Formation and spectral characterisation of Bragg gratings in standard single-mode optical fibers

Permanent Bragg gratings in monomode optical fibers are obtained by irradiation through an interference pattern of an ultraviolet laser. The main parameters of such gratings, in particular the index modulation amplitude and their length, are precisely determined by a fine adjustment between the measured reflectivity and a theoretical curve. Gratings have been formed in a standard monomode telecommunication fiber, with reflectivities above 90% and with bandwidths on the order of 1 to 3 nm. Their reflectivity spectra are symmetric and comparable with theoretical curves. Index modulations up to 1.2 10-3 have been determined, which is more than one order of magnitude greater than earlier reported. A precise knowledge of the maximal index change allows one to know the formation possibilities of gratings with regard to reflectivity and bandwidth


Year:
1993
Keywords:
Note:
Ecole Polytech. Federale Lausanne, Switzerland
4506424
spectral characterisation
Bragg gratings
single-mode optical fibers
monomode optical fibers
interference pattern
index modulation amplitude
reflectivity
bandwidths
maximal index change
Laboratories:




 Record created 2009-01-20, last modified 2018-01-28


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