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Low-loss multimode optical nanofibers could provide a platform for studying and technologically exploiting nonlinear light-matter interactions. Here, adiabatic transport of multiple modes and highly efficient fundamental-to-fundamental third harmonic generation is demonstrated in a submicron silica fiber.

This paper demonstrates and characterizes a novel wavelength-tunable single-frequency erbium-doped fiber ring laser incorporating an all-fiber acoustooptic tunable bandpass filter and a self-constructed saturable absorption grating (SAG). Stable single-longitudinal-mode operation was achieved over the wavelength range of 48 nm with a sidemode suppression ratio higher than 50 dB. The wavelength tuning characteristics, and the laser dynamics in wavelength switching and sweeping are analyzed in detail. A theoretical analysis on the effect of the SAG is also described. [ABSTRACT FROM PUBLISHER]

We investigated the loss modulation effect on the second-harmonically mode-locked erbium-doped fiber laser based on the Sagnac loop reflector with a Y-branch LiNbO[sub 3] phase modulator. We found that even a small loss modulation originating from the phase modulator could cause severe peak power difference between two output pulses in a modulation period. It was also found that the peak power difference was sensitively dependent on the modulation frequency. By numerical simulation, we quantitatively analyzed the relation between the peak power difference and the amount of loss modulation, which agreed well with the experimental results. [ABSTRACT FROM AUTHOR]

Transverse acoustic resonances at gigahertz frequencies are excited by electrostriction in the few-micrometer-thick waists of low-loss optical fiber tapers of up to 40 cm long. A pump-probe technique is used in which the resonances are excited by a train of optical pulses and probed in a Sagnac interferometer. Strong radially symmetric acoustic resonances are observed and the dependence of their frequencies on taper thickness is investigated. Such easily reconfigurable acousto-optic interactions may have applications in the high-frequency mode locking of fiber lasers. [ABSTRACT FROM AUTHOR]

We propose and experimentally demonstrate a novel configuration for an acoustooptic tunable bandpass filter based on intermodal coupling in a two-mode fiber. The double-pass scheme provides zero frequency-shift, bandwidth narrowing, and enhanced extinction ratio. A 3-dB bandwidth of 2.0 nm, insertion loss of 5.6 dB, and sidelobe suppression ratio of 14 dB were achieved. The wavelength tuning range was greater than 90 nm for the transmission dynamic range larger than 20 dB. Multiwavelength operation of a single device is achieved by simply applying multifrequency electrical signal. Unwanted intensity modulation of the multiwavelength filter is also investigated [ABSTRACT FROM PUBLISHER]

We demonstrate a narrow-bandwidth acoustooptic tunable filter with very low polarization-sensitivity using a dispersion-compensating fiber that has a large group index difference between the core and the cladding modes with a specific stress distribution. The 3-dB bandwidth of the filter is 0.8 nm with the interaction length of 10 cm, and the polarization-dependent center-wavelength splitting is 0.04 nm at the wavelength around 1550 nm. The origin of the low polarization-dependence is successfully explained through the analysis on the stress field in the fiber. [ABSTRACT FROM PUBLISHER]