We present a new technique for extending the decay time of the impulse response function of a Fabry-Perot filter while simultaneously maintaining a large bandwidth. It involves double passing through the filter and it can be used for the easy multiplication of the repetition rate of optical sources. We apply the concept to a 10-GHz pulse train to demonstrate experimentally the rate quadruplication to 40 GHz.
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Yiannopoulos et al. (2003) studied this question.
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