We report a passively Er3+-doped mode-locked fiber laser based on repetition rate multiplication, in which a three-stage Mach Zehnder interference structure is employed as a repetition rate multiplier. The initial soliton pulses are generated from a ring cavity with a fundamental repetition rate of 102.70 MHz, which is a seed laser. When the intrinsic frequency of repetition rate multiplier is almost aligned with a variable optical delay line, the initial repetition rate output from a seed laser, is lifted from 100.20 MHz to 801.03 MHz. This result demonstrates a method to achieve high repetition rate (> 500 MHz) pulse lasers, which avoids the limitation of cavity length on the repetition rate.
Since the growing needs of broadband optical frequency combs (OFCs) in many applications, in this paper, a carrier suppressed dual-sideband modulation recirculating frequency shift loop (RFSL) with an additional piece of highly nonlinear fiber (HNLF) is numerically investigated. The numerical results indicate that, thanking to the RFSL scheme, the frequency spacing of OFC can be both widely and precisely tuned over the range of 0.5 - 40 GHz. Moreover, the comb lines generated from RFSL can be then efficiently increased, using four wave mixing effect of HNLF in the simulation, thus the spectrum is further broadened. This work contributes to an effective and compact RFSL scheme for a frequency tunable OFC generation with broadband spectrum.
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