Theoretical analysis of high-repetition rate optical-pulse multiplication using fiber-coupler loop configuration

A new approach to generate ultrahigh-repetition rate optical pulses is proposed and analyzed theoretically. It is different from conventional approaches, which use fiber or integrated waveguide delay line circuits. The high-repetition-rate optical-pulse multiplication phenomenon occurs when the optical pulse's spectral width is greater than the transfer bandwidth of the coupler used. From the analysis, pulse doubling at repetition rates beyond the hundred-GHz range can be achieved using an all-fiber low-loss wavelength-division coupler with a looped end. The output repetition rate can be controlled by using fiber couplers with different equivalent transfer bandwidths.<
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