No abstract

Fabrication steps for reproducible manufacturing of drawn single mode fiber tapers with quartz glass and high-index lenses and their performance are described in detail. High coupling efficiencies on the order of 50 % with good reproducibility are obtainable. The best value so far obtained has been 62 %. Drawing conditions influencing the taper and lens geometry were evaluated experimentally. Finally, the measurements of the overall optical properties, i.e. coupling efficiency and optical feedback as a function of relevant taper and lens parameters are presented and discussed.

No abstract

A high speed optical sampler is proposed that is driven by cw microwaves. The sampler is composed of waveguide interferometers of the type originally proposed by Martin. A voltage applied to one (or both) arms of the interferometer modulates the interference of the optical radiation at the output.Such an interferometer can be driven at high frequencies if synchronism is maintained between the optical radiation and the applied voltage pattern. Spatially periodic exciting structures can serve this purpose. Deviations from synchronism can be compensated (within limits) by adjustment of the peak amplitude of the microwave voltage. A cascade of four interferometers on LiNbO , driven at 10 GHz, at multiples of (appr.) 3V (3, 6, 12, 24) have a predicted samprling-function width of 2 ps at 20 GHz repetition rate.Experiments on single section and double -section interferometers will be reported. I. AbstractA high speed optical sampler is proposed that is driven by cw microwaves. The sampler is composed of waveguide interferometers of the type originally proposed by Martin. A voltage applied to one (or both) arms of the interferometer modulates the interference of the optical radiation at the output. Such an interferometer can be driven at high frequencies if synchronism is maintained between the optical radiation and the applied voltage pattern. Spatially periodic exciting structures can serve this purpose. Deviations from svnchronism can be compensated (within limits) by adjustment of the peak amplitude of the microwave voltage. A cascade of four interferometers on LiNbO^, driven at 10 GHz, at multiples of (appr.) 3V (3, 6, 12, 24) have a predicted sampling-function width of 2 ps at 20 GHz repetition rate. Experiments on single section and double-section interferometers will be reported.