Abstract
We describe an all-pass fiber resonator with active phase-locking capability for accurate multiplication of the repetition rate of femtosecond light pulses. The cavity length of the resonator is precisely controlled using the Pounder-Drever-Hall phase-locking technique so that the repetition rate is multiplied in stabilization to the Rb atomic clock. Our test result proves the proposed phase-locking scheme is an effective means of generating higher repetition rate pulses with no significant power loss while providing a high degree of long-term stability.
Highlights
IntroductionEfforts are being made to bring the repetition rate of femtosecond light pulses upward, preferably to the upper GHz regime, in response to the need in diverse applications; optical frequency metrology [1,2,3], optical communications [4,5], arbitrary waveform generation [6,7], calibration of astronomical spectrographs [8,9], photonic analog-to-digital converters [10,11], microwave generation [12], and absolute distance measurements [13,14,15,16]
The state-of-the-art repetition rate of rare-earth-doped fiber lasers demonstrates above 1 GHz, even though it is being limited by the rare-earth doping density of available gain fibers and its physical length [18,19]
In the case of unequal-arm Mach-Zehnder interferometers (MZIs), a single MZI leads to only doubling of the repetition rate, requiring multiple MZIs cascaded in series to achieve a high multiplication
Summary
Efforts are being made to bring the repetition rate of femtosecond light pulses upward, preferably to the upper GHz regime, in response to the need in diverse applications; optical frequency metrology [1,2,3], optical communications [4,5], arbitrary waveform generation [6,7], calibration of astronomical spectrographs [8,9], photonic analog-to-digital converters [10,11], microwave generation [12], and absolute distance measurements [13,14,15,16]. Pulse-interleaving performed by incorporating extra devices at the exit of the oscillator permits producing higher repetition rate pulses This approach of so-called repetition rate multiplication has been demonstrated so far using Fabry-Perot etalons [20,21], Mach-Zehnder interferometers [22,23] and sub-ring fiber resonators [24,25,26]. The fiber sub-ring resonator is most effective in conserving the pulse energy since it acts as an all-pass type resonator which transmits all the input pulse energy through the exit junction without significant loss [25] In this investigation, we demonstrate a phase-locked sub-ring fiber resonator devised for stable multiplication of the repetition rate of an Er-doped fiber oscillator. The stability of multiplied pulses are tested to validate the proposed resonator with phase-locking capability as an effective means of generating higher repetition rate pulses with no significant power loss while providing a high degree of longterm stability
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