Abstract
An ultrafine frequency linearly tunable single-frequency fiber laser based on the intracavity active tuning is demonstrated. Single-frequency operation can be achieved by an ultrashort cavity and ultranarrow polarization-maintaining fiber Bragg grating. A sub-nanometer-accuracy piezoelectric ceramic actuator with closed-loop mode has been employed to realize the cavity-length active tuning scheme, which can achieve a linear tuning range of >1 GHz with a 3.2-MHz/nm tuning resolution. The periodic tuning repeatability and repeat accuracy show that the scheme can realize linear frequency tuning with great tuning repeatability and high tuning precision.
Highlights
Tunable single-frequency fiber lasers have the characteristics of adjustable wavelength, narrow linewidth, high service life, and good compatibility with fiber communication system [1]–[5], and have become key devices in all-optical networks to realize the functions of all-optical wavelength conversion (AOWC), optical cross-connect (OXC), and optical add/drop multiplexers (OADMs) [6]– [9]
We experimentally demonstrate an ultrafine-frequency linearly modulated singlefrequency fiber laser with an ultrashort cavity length of 9.5 cm
A novel ultrafine frequency linearly tunable single-frequency fiber laser based on the intercavity active tuning is demonstrated
Summary
Tunable single-frequency fiber lasers have the characteristics of adjustable wavelength, narrow linewidth, high service life, and good compatibility with fiber communication system [1]–[5], and have become key devices in all-optical networks to realize the functions of all-optical wavelength conversion (AOWC), optical cross-connect (OXC), and optical add/drop multiplexers (OADMs) [6]– [9]. Owing to the uncertainty modulation effect on the center wavelength, bandwidth, and reflectivity of the gratings, it is rather difficult or even impossible to achieve a linearly modulated single-frequency laser source [19]. We experimentally demonstrate an ultrafine-frequency linearly modulated singlefrequency fiber laser with an ultrashort cavity length of 9.5 cm. A PZT actuator with a strain gauge sensor (SGS) is bonded with the active fiber, which can realize closed-loop operation to accurately modulate the cavity length. Single-frequency operation can be possibly achieved by the short laser cavity and an ultranarrow bandwidth (0.02 nm) of a polarization-maintaining FBG (PM-FBG) as stable laser oscillation is established in a very short time. The laser has very stable frequency linear tuning over the entire tuning range, showing excellent repeatability and periodicity
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