Colliding-pulse hybridly mode-locked erbium-doped all-fiber soliton gyrolaser

Abstract

We report a study on the gyroscopic effect in a bidirectional ultra-short pulse erbium-doped all-fiber ring soliton laser hybridly mode-locked with co-action of single-walled carbon nanotubes and nonlinear polarization evolution introduced by a short-segment polarizing fiber. We directly compare two gyroscopes with different scale factor values and coil numbers by studying important gyroscopic characteristics such as rotation sensitivity, dead bandwidth and beat-note frequency stability. The detected angular velocity ranged from 0.12 deg s −1 to 360 deg s −1 , while the highest rotation sensitivity reached 7 kHz/(deg s −1 ) for a 0.79 m 2 single-coil ring gyroscope, which was in agreement with the calculated scale factor value. The gyroscope dead band with an upper limit of ≈5.15 deg s −1 corresponding to the lowest beat-note frequency of ≈15 kHz was detected during clockwise rotation of the turntable. The highest gyroscope resolution of R ~ 0.01 deg s −1 = 38 deg h −1 was estimated on the basis of bias point drift measurements.

Colliding pulse mode-locked all polarization maintaining fiber gyrolaser

“…Although gyroscopic response was successfully realized in discrete element bidirectional mode-locked dye lasers [1][2][3], it is impractical in commercial systems. Fiber lasers are the most promising laser media to implement IPI owing to the possibility of producing ultrashort pulses with a compact and low-cost design [4][5][6][7]. However, the nonlinear effects distributed over long distances in fiber lasers poses a challenge to the implementation of IPI in fiber lasers.…”

Intracavity Measurement Sensitivity Enhancement without Runaway Noise

“…With few exceptions [7][8][9] most reports based on intracavity phase sensing have been limited to cw lasers, i.e., the gyroscope. In this context, a recent hot topic is a byproduct of the field of non-Hermitian quantum mechanics and the discovery of the Exceptional Point (EP) [10].…”

Controlling group and phase velocities in bidirectional mode-locked fiber lasers

“…This results in having different repetition rates (pulse velocities) and wavelengths (frequencies); a mode of operation totally inadequate for IPI [24,25,26]. Remarkably successful implementations of IPI in passively mode-locked bidirectional fiber lasers, as laser gyros, have been demonstrated by Kieu et al [27], and more recently by Krylov et al [28]. However, a large bias beat note is measured in fiber laser gyros as a result of the asymmetry in phase velocities.…”